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unit_asteroid.pas
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unit_asteroid.pas
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unit unit_asteroid;
{Copyright (C) 2021 by Han Kleijn, www.hnsky.org
email: han.k.. at...hnsky.org
This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, You can obtain one at https://mozilla.org/MPL/2.0/. }
interface
uses
Classes, SysUtils, Forms, Controls, Graphics, Dialogs, StdCtrls, ComCtrls,
LCLIntf, ColorBox, Buttons,{for for getkeystate, selectobject, openURL}
math, astap_main, unit_stack, unit_ephemerides;
type
{ Tform_asteroids1 }
Tform_asteroids1 = class(TForm)
add_annotations1: TCheckBox;
annotate_asteroids1: TButton;
BitBtn1: TBitBtn;
BitBtn2: TBitBtn;
download_mpcorb1: TBitBtn;
cancel_button1: TButton;
ColorBox1: TColorBox;
date_label1: TLabel;
date_obs1: TEdit;
file_to_add1: TButton;
file_to_add2: TButton;
Group_Box1: TGroupBox;
Group_Box2: TGroupBox;
help_asteroid_annotation1: TLabel;
label_start_mid1: TLabel;
Label2: TLabel;
Label3: TLabel;
latitude1: TEdit;
longitude1: TEdit;
max_magn_asteroids1: TEdit;
annotation_size1: TEdit;
max_nr_asteroids1: TEdit;
mpcorb_filedate1: TLabel;
mpcorb_filedate2: TLabel;
mpcorb_path2: TLabel;
mpcorb_path1: TLabel;
OpenDialog1: TOpenDialog;
showfullnames1: TCheckBox;
add_subtitle1: TCheckBox;
font_follows_diameter1: TCheckBox;
showmagnitude1: TCheckBox;
max_magn_asteroids2: TUpDown;
annotation_size2: TUpDown;
up_to_magn1: TLabel;
up_to_number1: TLabel;
procedure annotate_asteroids1Click(Sender: TObject);
procedure BitBtn1Click(Sender: TObject);
procedure BitBtn2Click(Sender: TObject);
procedure cancel_button1Click(Sender: TObject);
procedure download_mpcorb1Click(Sender: TObject);
procedure file_to_add1Click(Sender: TObject);
procedure file_to_add2Click(Sender: TObject);
procedure FormClose(Sender: TObject; var CloseAction: TCloseAction);
procedure FormKeyPress(Sender: TObject; var Key: char);
procedure FormShow(Sender: TObject);
procedure Group_Box1Click(Sender: TObject);
procedure help_asteroid_annotation1Click(Sender: TObject);
procedure latitude1Change(Sender: TObject);
procedure longitude1Change(Sender: TObject);
private
public
end;
type
Tasteroid =record
yy,mm,dd,
a_e,a_or_q ,a_i,a_ohm,a_w,a_M,H,
a_g : double;
desn: string[9]; //fixed size otherwise problems with resizing. 7 charactor are required for asteroids and 9 for comets. So 9 will fit both.
name: string[28];//fixed size otherwise problems with resizing
end;
var
form_asteroids1: Tform_asteroids1;
asteroid_buffer : array of Tasteroid;
const
maxcount_asteroid : string='10000';
maxmag_asteroid : string='17';
mpcorb_path : string='MPCORB.DAT';
cometels_path : string='*.txt';
font_follows_diameter:boolean=false;
showfullnames: boolean=true;
showmagnitude: boolean=false;
add_annotations: boolean=false;{annotation to the fits header}
add_date: boolean=true;
procedure plot_mpcorb(maxcount : integer;maxmag:double;add_annot,use_buffer :boolean) ;{read MPCORB.dat}{han.k}
function deltaT_calc(jd: double) : double; {delta_T in days}
implementation
uses unit_hjd; {for polar2}
{$R *.lfm}
var
// X_pln,Y_pln,Z_pln : double; {of planet}
wtime2actual: double;
midpoint : boolean;
site_lat_radians,site_long_radians : double;
const
sun200_calculated : boolean=false; {sun200 calculated for comets}
VAR
// TEQX : double;
// pb_earth, vb_earth : r3_array;{heliocentric earth vector}
ph_earth, vh_earth : r3_array;{Barycentric earth vector}
ph_pln : r3_array;{helio centric planet vector}
procedure Tform_asteroids1.help_asteroid_annotation1Click(Sender: TObject); {han.k}
begin
openurl('http://www.hnsky.org/astap.htm#asteroid_annotation');
end;
procedure Tform_asteroids1.latitude1Change(Sender: TObject);{han.k}
var
errordecode:boolean;
begin
dec_text_to_radians(latitude1.Text,site_lat_radians,errordecode);
if errordecode then latitude1.color:=clred else latitude1.color:=clwindow;
end;
procedure Tform_asteroids1.longitude1Change(Sender: TObject);{han.k}
var
errordecode:boolean;
begin
dec_text_to_radians(longitude1.Text,site_long_radians,errordecode);
if errordecode then longitude1.color:=clred else longitude1.color:=clwindow;
end;
//function calculate_Earth_vector(mjd : double; out PV_earth: PV_array): integer;// PV_earth vector contains X,Y,Z in AU and XV,YV, ZV speeds in AU/day
//Const
// TAU=499.004782;
//var
// R : double;
// PH, VH, PB, VB : PH_array;
//begin
// if ((mjd>88070) {>year 2100} or (mjd<15021 {<year 1900})) then {calculate_Earth_Moon_Barycentre_vector outside years 1900 to 2100. This is valid from 1000 to 3000}
// begin //The barycenter is located on average 4,671 km (2,902 mi) from Earth's center. This gives a small error}
// sla_PLANET(mjd,3, {out} PV_earth, result {error});
// end
// else
// begin {high accuracy routine for year 1900 to 2100}
// sla_EPV (mjd, PH, VH{, PB, VB });{high accuracy for years 1900 to 2100}
// PV_earth[1]:=PH[1]; {x position}
// PV_earth[2]:=PH[2]; {y position}
// PV_earth[3]:=PH[3]; {z position}
// PV_earth[4]:=VH[1]/(24*3600); {Convert velocity VH to AU per second}
// PV_earth[5]:=VH[2]/(24*3600);
// PV_earth[6]:=VH[3]/(24*3600);
// end;
// R:=sqrt(sqr(PV_earth[1])+sqr(PV_earth[2])+sqr(PV_earth[3]));{Earth Sun distance}
// if ((R>0.9) and (R<1.1)) then result:=0 else result:=99; {Earth at one AU distance?}
//end;
procedure parallax_xyz(wtime,latitude : double;var x,y,z: double); {X,Y,Z in AU, parallax can be 8.8 arcsec per au distance. See new meeus page 78}
const
AE=149597870.700; {ae has been fixed to the value 149597870.700 km as adopted by the International Astronomical Union in 2012. Note average earth distance is 149597870.662 * 1.000001018 see meeus new 379}
var
sin_latitude_corrected,
cos_latitude_corrected,
height_above_sea,
flatteningearth,
x_observ,y_observ,z_observ,u :double;
begin
height_above_sea:=100;{meters}
flatteningearth:=0.99664719; {earth is not perfect round}
u:=arctan(flatteningearth*sin(latitude)/cos(latitude)); {tan:=sin/cos}
sin_latitude_corrected:=flatteningearth*sin(u)+height_above_sea*sin(latitude)/6378140;
cos_latitude_corrected:=cos(u)+height_above_sea*cos(latitude)/6378140;
{above values are very close to sin(latitude) and cos(latitude)}
X_observ := (6378.14/AE)*cos_latitude_corrected * COS(wtime);
Y_observ := (6378.14/AE)*cos_latitude_corrected * SIN(wtime);
Z_observ := (6378.14/AE)*sin_latitude_corrected;
X:=X-X_observ; Y:=Y-Y_observ; Z:=Z-Z_observ;
end;
procedure minor_planet(sun_earth_vector:boolean;julian {dynamic time}:double;year,month:integer;day,a_e, a_or_q,a_i,a_ohm,a_w,a_M :double;out RA3,DEC3,DELTA,sun_delta:double; out outdated : boolean);
{ Comet hale bopp
YEAR:=1997;
MONTH:=03;
D:=29.74151986;
Q:= 0.901891; Perihelion distance q in AU, AORQ
ECC:= 0.994952; Eccentricity e
INC2:= 89.0445; Inclination i, OrbInc
LAN:= 283.2449; Longitude of the ascending node, Anode
AOP:= 130.5115; Argument of perihelion, Perih}
const
TAU=499.004782;
var
JSTAT,I : integer;
x_pln,y_pln,z_pln,TL,R, epoch,mjd : double;
pv : r6_array;
begin
mjd:=julian-2400000.5; {convert to mjd}
if sun_earth_vector=false then
begin
sla_EPV2(mjd,false {heliocentric}, ph_earth,vh_earth);{Heliocentric position earth including light time correction, high accuracy for years 1900 to 2100}
sun200_calculated:=true;
end;
epoch:= julian_calc(year,month,day,0,0,0)-2400000.5; {MJD}
if a_M<1E98 then {asteroid. Use a_M, mean anomoly as an indicator for minor planet or comet, The mean anomoly of a comet is in princple zero and at perihelion}
begin
orbit (mjd, 2 {minor planet}, epoch, a_i*pi/180, a_ohm*pi/180,a_w*pi/180, a_or_q,a_e,a_M*pi/180, 0, PV, JSTAT); //Determine the position and velocity.
outdated:=abs(epoch - mjd)>120;//more then 120 days from epoch database
end
else
begin
orbit (mjd, 3 {comet} , epoch, a_i*pi/180, a_ohm*pi/180,a_w*pi/180,a_or_q, a_e,0 , 0, PV, JSTAT);//Determine the position and velocity.
outdated:=false;//epoch is when the comet is nearest
end;
if (Jstat <> 0) then
begin
exit;
end;
{ Option JFORM := 2, suitable for minor planets:;
*;
* EPOCH := epoch of elements (TT MJD);
* ORBINC := inclination i (radians);
* ANODE := longitude of the ascend;
* PERIH := argument of perihelion, little omega (radians);
* AORQ := mean distance, a (AU);
* E := eccentricity, e (range 0 to <1);
* AORL := mean anomaly M (radians);
*;
* Option JFORM := 3, suitable for comets:;
*;
* EPOCH := epoch of elements and perihelion (TT MJD);
* ORBINC := inclination i (radians);
* ANODE := longitude of the ascend;
* PERIH := argument of perihelion, little omega (radians);
* AORQ := perihelion distance, q (AU);
* E := eccentricity, e (range 0 to 10);}
R:=sqrt(sqr(pv[1]-ph_earth[1])+sqr(pv[2]-ph_earth[2])+sqr(pv[3]-ph_earth[3]));{geometric distance minor planet and Earth in AU}
TL:=TAU*R;// Light time (sec);
{note with PB_earth, so distance to Barycentric position there is a big error. Use PH_earth}
x_pln:=pv[1]-ph_earth[1]-TL*(pv[4]);{ Correct position for planetary aberration. Use the speed values to correct for light traveling time. The PV_earth is already corrected for aberration!!}
y_pln:=pv[2]-ph_earth[2]-TL*(pv[5]);
z_pln:=pv[3]-ph_earth[3]-TL*(pv[6]);
PARALLAX_XYZ(wtime2actual,site_lat_radians,X_pln,Y_pln,Z_pln);{correct parallax X, Y, Z in AE. This should be done in Jnow so there is a small error in J2000 }
polar2(x_pln,y_pln,z_pln,delta,dec3,ra3) ;
ph_pln[1]:=pv[1];{store for illumination calculation}
ph_pln[2]:=pv[2];
ph_pln[3]:=pv[3];
sun_delta:=sqrt(sqr(pv[1])+sqr(pv[2])+sqr(pv[3]));
end;
procedure illum2( x,y,z, xe,ye,Ze: double; out R_SP,R_EP,elong,phi,phase: double);
var
xp,yp,zp, re, c_phi : double;
begin
xp:=x-xe; yp:=y-ye; zp:=z-ze; //minor planet geocentric position
{Compute the distances in the Sun-Earth-planet triangle}
r_sp:= sqrt(sqr(x)+sqr(y)+sqr(z)); {Distance Sun and minor planet}
re := sqrt(sqr(xe)+sqr(ye)+sqr(ze)); {Distance Sun and Earth}
r_ep:= sqrt(sqr(xp)+sqr(yp)+sqr(zp)); {Distance Earth and minor planet}
elong:=(180/pi)*arccos( ( r_ep*r_ep + re*re - r_sp*r_sp ) / ( 2.0*r_ep*re ) );{calculation elongation, phase angle and phase}
c_phi:=( sqr(r_ep) + sqr(r_sp) - sqr(re) ) / (2.0*r_ep*r_sp);
phi :=(180/pi)*arccos( c_phi );{phase angle in degrees}
phase:= 100*0.5*(1.0+c_phi); {0..100}
end;
function illum_planet : double; { Get phase angle comet. Only valid is comet routine is called first.}
var
r_sp,r_ep,elong,phi1,phase1 :double;
begin
illum2(ph_pln[1],ph_pln[2],ph_pln[3],ph_earth[1],ph_earth[2],ph_earth[3],r_sp,r_ep,elong,phi1, phase1 );{ heliocentric positions minor planet and earth}
result:=phi1*pi/180;
end;
Function asteroid_magn_comp(g ,b :double):double; {Magnitude change by phase asteroid, New meeus 32.14} {han.k}
{g = slope parameter, b= angle sun-asteroid-earth}
var b2,q1,q2 :double;
begin
b2:=sin(b*0.5)/cos(b*0.5); {tan is sin/cos}
q1:=EXP(-3.33*EXP(0.63*LN(b2+0.00000001))); {power :=EXP(tweedevar*LN(eerstevar))}
q2:=EXP(-1.87*EXP(1.22*LN(b2+0.00000001)));
asteroid_magn_comp:= -2.5*ln( (1-g)*q1 + g*q2 )/ln(10);
end;
//A brief header is given below:
//Des'n H G Epoch M Peri.(w) Node(ohm) Incl. e n a Reference #Obs #Opp Arc rms Perts Computer
//----------------------------------------------------------------------------------------------------------------------------------------------------------------
//00001 3.4 0.15 K205V 162.68631 73.73161 80.28698 10.58862 0.0775571 0.21406009 2.7676569 0 MPO492748 6751 115 1801-2019 0.60 M-v 30h Williams 0000 (1) Ceres 20190915
//00002 4.2 0.15 K205V 144.97567 310.20237 173.02474 34.83293 0.2299723 0.21334458 2.7738415 0 MPO492748 8027 109 1821-2019 0.58 M-v 28h Williams 0000 (2) Pallas 20190812
//00003 5.2 0.15 K205V 125.43538 248.06618 169.85147 12.99105 0.2569364 0.22612870 2.6682853 0 MPO525910 7020 106 1821-2020 0.59 M-v 38h Williams 0000 (3) Juno 20200109
//00004 3.0 0.15 K205V 204.32771 150.87483 103.80908 7.14190 0.0885158 0.27150657 2.3620141 0 MPO525910 6941 102 1821-2019 0.60 M-p 18h Williams 0000 (4) Vesta 20191229
//00005 6.9 0.15 K205V 17.84635 358.64840 141.57102 5.36742 0.1909134 0.23866119 2.5740373 0 MPO525910 2784 77 1845-2020 0.53 M-v 38h Williams 0000 (5) Astraea 20200105
//00006 5.7 0.15 K205V 190.68653 239.73624 138.64343 14.73966 0.2032188 0.26107303 2.4245327 0 MPO525910 5745 90 1848-2020 0.53 M-v 38h Williams 0007 (6) Hebe 20200110
//; Readable designation yyyymmdd.ddd e a [ae] i ohm w Equinox M-anomaly H G
//;--------------------------------------------------------------------------------------------------------------------------
// (1) Ceres |20200531.000|0.0775571| 2.7676569| 10.58862| 80.28698| 73.73161|2000|162.68631| 3.4 | 0.15|J1
function strtofloat(st: string) : double; {han.k}
var
error2 : integer;
begin
val(st,result,error2);
end;
function deltaT_calc(jd: double) : double; {delta_T in days}
var
year : integer;
y,u,t : double;
begin
y:=(2000 +(JD-2451544.5)/365.25);
year:=round(y);
if ((year>=2016) and (year<=2020)) then
begin
t:=y-2016;
result:=(68.3+t*0.54);{seconds} // (71-68.3)/5 = 0.54
end
else
if ((year>=2021) and (year<=2024)) then
begin
t:=y-2021;
result:=(71+t*0.5);{seconds} // (73-71)/4 = 0.5
end
else
if ((year>=2025) and (year<=2049)) then
begin
t:=y-2000;
result:=(61.46+t*(0.32217+t*(0.005589)));{seconds}
end
else
if ((year>=2050) and (year<=2149)) then
begin
u:=(y-1820)/100;
t:=2150-y;
result:=(-20+32*u*u-0.5788*t);{seconds}
end
else
if ((year>=2150) and (year<=2999)) then
begin // End of Espenak range
u:=(y-1820)/100;
result:=(-20+32*u*u);{seconds}
end
else
result:=60;
result:=result/(24*3600);{convert results to days}
end;
//A brief header is given below:
//Des'n H G Epoch M Peri. Node Incl. e n a Reference #Obs #Opp Arc rms Perts Computer
//----------------------------------------------------------------------------------------------------------------------------------------------------------------
//00001 3.4 0.15 K205V 162.68631 73.73161 80.28698 10.58862 0.0775571 0.21406009 2.7676569 0 MPO492748 6751 115 1801-2019 0.60 M-v 30h Williams 0000 (1) Ceres 20190915
//00002 4.2 0.15 K205V 144.97567 310.20237 173.02474 34.83293 0.2299723 0.21334458 2.7738415 0 MPO492748 8027 109 1821-2019 0.58 M-v 28h Williams 0000 (2) Pallas 20190812
//00003 5.2 0.15 K205V 125.43538 248.06618 169.85147 12.99105 0.2569364 0.22612870 2.6682853 0 MPO525910 7020 106 1821-2020 0.59 M-v 38h Williams 0000 (3) Juno 20200109
//00004 3.0 0.15 K205V 204.32771 150.87483 103.80908 7.14190 0.0885158 0.27150657 2.3620141 0 MPO525910 6941 102 1821-2019 0.60 M-p 18h Williams 0000 (4) Vesta 20191229
//00005 6.9 0.15 K205V 17.84635 358.64840 141.57102 5.36742 0.1909134 0.23866119 2.5740373 0 MPO525910 2784 77 1845-2020 0.53 M-v 38h Williams 0000 (5) Astraea 20200105
//00006 5.7 0.15 K205V 190.68653 239.73624 138.64343 14.73966 0.2032188 0.26107303 2.4245327 0 MPO525910 5745 90 1848-2020 0.53 M-v 38h Williams 0007 (6) Hebe 20200110
procedure convert_MPCORB_line(txt : string; out desn,name: string; out yy,mm : integer; out dd,a_e,a_a,a_i,a_ohm,a_w,a_M,h,g: double);{read asteroid, han.k}
var
code2 : integer;
centuryA : string[2];
begin
desn:='';{assume failure}
// Epoch (in packed form, .0 TT), see http://www.minorplanetcenter.net/iau/info/MPOrbitFormat.html}
// 1996 Jan. 1 = J9611
// 1996 Jan. 10 = J961A
// 1996 Sept.30 = J969U
// 1996 Oct. 1 = J96A1
// 2001 Oct. 22 = K01AM
str(Ord(txt[21])-55:2,centuryA); // 'A'=65
if ((centuryA='19') or (centuryA='20') or (centuryA='21')) then {do only data}
begin
name:=copy(txt,167,194-167+1); //28 charaters
desn:=trimRight(copy(txt,1,7));//7 characters
H:=strtofloat(copy(txt,8,12-8+1)); { 8 - 12 f5.2 Absolute magnitude, H}
G:=strtofloat(copy(txt,14,19-14+1)); {14 - 19 f5.2 Slope parameter, G}
yy:=strtoint(centuryA+txt[22]+txt[23]);{epoch year}
code2:=Ord(txt[24]);
if code2<65 then mm:=code2-48 {1..9} else mm:=code2-55; {A..Z}
code2:=Ord(txt[25]);
if code2<65 then dd:=code2-48 {1..9} else dd:=code2-55; {A..Z}
a_M:=strtofloat(copy(txt,27,35-27+1)); {27 - 35 f9.5 Mean anomaly at the epoch, in degrees}
a_w:=strtofloat(copy(txt,38,46-38+1)); {38 - 46 f9.5 Argument of perihelion, J2000.0 (degrees)}
a_ohm:=strtofloat(copy(txt,49,57-49+1)); {49 - 57 f9.5 Longitude of the ascending node, J2000.0 (degrees)}
a_i:=strtofloat(copy(txt,60,68-60+1)); {60 - 68 f9.5 Inclination to the ecliptic, J2000.0 (degrees)}
a_e:=strtofloat(copy(txt,71,79-71+1)); {71 - 79 f9.7 Orbital eccentricity}
a_a:=strtofloat(copy(txt,93,103-93+1)); {93 - 103 f11.7 Semimajor axis (AU)}
end;
end;
procedure convert_comet_line(txt : string; out desn,name: string; out yy,mm :integer; out dd, ecc,q,inc2,lan,aop,M_anom,H,k: double); {han.k}
var
error1,error2 : integer;
g : double;
begin
desn:='';{assume failure}
val(copy(txt,15,4),yy,error2);//epoch year.
if ((error2=0) and (yy>1900) and (yy<2200)) then {do only data}
begin
mm:=strtoint(copy(txt,20,2));{epoch month}
dd:=strtofloat(copy(txt,23,7));{epoch day}
q:=strtofloat(copy(txt,31,9)); {q}
ecc:=strtofloat(copy(txt,41,9));
aop:=strtofloat(copy(txt,51,9));
lan:=strtofloat(copy(txt,61,9));
inc2:=strtofloat(copy(txt,71,9));
M_anom:=1E99;{Should be zero since comet values are give at perihelion. But label this as a a comet by abnormal value 1E99}
H:=strtofloat(copy(txt,91,5)); { Absolute magnitude, H}
val(copy(txt,97,4),g,error1);
k:=g*2.5; { Comet activity}
name:=copy(txt,103,28);//could be 56 charactor long. Limit to 28 as used for asteroids
desn:=copy(txt,160,9); //9 charactors long. The record size of asteroid_buffer.name should match
{Hale Bopp
Q:= 0.91468400000000005; Perihelion distance q in AU;
ECC:= 0.99492999999999998; Eccentricity e
INC2:= 88.987200000000001; Inclination i
LAN:= 283.36720000000003; Longitude of the ascending node
AOP:= 130.62989999999999; Argument of perihelion}
end;
end;
procedure plot_mpcorb(maxcount : integer;maxmag:double;add_annot,use_buffer:boolean) ;{read MPCORB.dat}{han.k}
const
a_g : double =0.15;{asteroid_slope_factor}
siderealtime2000=(280.46061837)*pi/180;{[radians], sidereal time at 2000 jan 1.5 UT (12 hours) =Jd 2451545 at meridian greenwich, see new meeus 11.4}
earth_angular_velocity = pi*2*1.00273790935; {about(365.25+1)/365.25) or better (365.2421874+1)/365.2421874 velocity dailly. See new Meeus page 83}
var
txtf : textfile;
count,fontsize,counter,yy,mm : integer;
dd,h,a_or_q, DELTA,sun_delta,ra2,dec2,mag,phase,delta_t,
SIN_dec_ref,COS_dec_ref,c_k,fov,cos_telescope_dec,u0,v0 ,a_e,a_i,a_ohm,a_w,a_M : double;
desn,name,s, thetext1,thetext2,fontsize_str : string;
form_existing, errordecode,outdated : boolean;
procedure plot_asteroid(sizebox :integer);
var
dra,ddec, delta_ra,det,SIN_dec_new,COS_dec_new,SIN_delta_ra,COS_delta_ra,hh : double;
x,y : double;
begin
//memo2_message('Asteroid position at :'+head.date_obs+', '+#9+floattostr(ra2*180/pi)+','+floattostr(dec2*180/pi));
{5. Conversion (RA,DEC) -> (x,y)}
sincos(dec2,SIN_dec_new,COS_dec_new);{sincos is faster then separate sin and cos functions}
delta_ra:=ra2-head.ra0;
sincos(delta_ra,SIN_delta_ra,COS_delta_ra);
HH := SIN_dec_new*sin_dec_ref + COS_dec_new*COS_dec_ref*COS_delta_ra;
dRA := (COS_dec_new*SIN_delta_ra / HH)*180/pi;
dDEC:= ((SIN_dec_new*COS_dec_ref - COS_dec_new*SIN_dec_ref*COS_delta_ra ) / HH)*180/pi;
det:=head.cd2_2*head.cd1_1 - head.cd1_2*head.cd2_1;
u0:= - (head.cd1_2*dDEC - head.cd2_2*dRA) / det;
v0:= + (head.cd1_1*dDEC - head.cd2_1*dRA) / det;
if sip then {apply SIP correction}
begin
x:=(head.crpix1 + u0 + ap_0_0 + ap_0_1*v0+ ap_0_2*v0*v0+ ap_0_3*v0*v0*v0 +ap_1_0*u0 + ap_1_1*u0*v0+ ap_1_2*u0*v0*v0+ ap_2_0*u0*u0 + ap_2_1*u0*u0*v0+ ap_3_0*u0*u0*u0); {3th order SIP correction, fits count from 1, image from zero therefore subtract 1}
y:=(head.crpix2 + v0 + bp_0_0 + bp_0_1*v0+ bp_0_2*v0*v0+ bp_0_3*v0*v0*v0 +bp_1_0*u0 + bp_1_1*u0*v0+ bp_1_2*u0*v0*v0+ bp_2_0*u0*u0 + bp_2_1*u0*u0*v0+ bp_3_0*u0*u0*u0); {3th order SIP correction}
end
else
begin
x:=(head.crpix1 + u0); {in FITS range 1..width}
y:=(head.crpix2 + v0);
end;
if ((x>0) and (x<head.width) and (y>0) and (y<head.height)) then {within image1}
begin
{annotate}
if showfullnames then thetext1:=trim(name) else thetext1:=desn;
if showmagnitude then thetext2:='{'+inttostr(round(mag*10))+'}' {add magnitude in next field} else thetext2:='';
if outdated then thetext2:=thetext2+'⚠ ' +'obsolete';
if add_annot then
begin
{store annotation. Fractions are for ephemeride alignment stacking}
add_text(mainwindow.memo1.lines,'ANNOTATE=',#39+copy(floattostrF(x-sizebox,FFFixed,0,2)+';'+floattostrF(y-sizebox,FFFixed,0,2)+';'+floattostrF(x+sizebox,fffixed,0,2)+';'+floattostrF(y+sizebox,FFFixed,0,2)+';-'+fontsize_str {-1 or larger}+';'{boldness}+thetext1+';'+thetext2+';'+desn+';',1,68)+#39); {store in FITS coordinates 1..}
annotated:=true;{header contains annotations}
end;
plot_the_annotation(round(x-sizebox) {x1},round(y-sizebox) {y1},round(x+sizebox){x2},round(y+sizebox){y2},-max(1,round(fontsize*10/12)/10){typ},thetext1+thetext2); {plot annotation}
end;
end;
procedure read_and_plot(asteroid: boolean; path :string);
begin
count:=0;
assignfile(txtf,path);
try
Reset(txtf);
while ((not EOF(txtf)) and (count<maxcount) and (esc_pressed=false)) do {loop}
begin
ReadLn(txtf, s);
if length(s)>10 then
begin
if asteroid then convert_MPCORB_line(s, {out} desn,name, yy,mm,dd,a_e,a_or_q {a},a_i,a_ohm,a_w,a_M,H,a_g){read MPC asteroid}
else convert_comet_line (s, {var} desn,name, yy,mm,dd,a_e,a_or_q {q},a_i,a_ohm,a_w,a_M,H,c_k); {read MPC comet}
if ((desn<>'') and (a_or_q<>0)) then {data line}
begin
try
inc(count);
{comet is indicated by a_M:=1E99, Mean anomoly, an abnormal value}
minor_planet(sun200_calculated,jd_mid+delta_t{delta_t in days},yy,mm,dd,a_e,a_or_q,a_i,a_ohm,a_w,a_M,{var} ra2,dec2,delta,sun_delta, outdated);
if sqr( (ra2-head.ra0)*cos_telescope_dec) + sqr(dec2-head.dec0)< sqr(fov) then {within the image FOV}
begin
if asteroid then
begin
mag:=h+ ln(delta*sun_delta)*5/ln(10); {log(x) = ln(x)/ln(10)}
phase:=illum_planet; { Get phase comet. Only valid if comet routine is called first.}
mag:=mag+asteroid_magn_comp(a_g{asteroid_slope_factor},phase);
{slope factor =0.15
angle object-sun-earth of 0 => 0 magnitude
5 0.42
10 0.65
15 0.83
20 1}
end
else
begin {comet magnitude}
mag:=H+ ln(delta)*5/ln(10)+ c_k*ln(sun_delta)/ln(10) ;
end;
if mag<=maxmag then
begin
if asteroid then
plot_asteroid(annotation_diameter)
else
plot_asteroid(annotation_diameter*5);
if counter>=length(asteroid_buffer) then
setlength(asteroid_buffer,length(asteroid_buffer)+1000);//increase buffer
asteroid_buffer[counter].yy:=yy;
asteroid_buffer[counter].mm:=mm;
asteroid_buffer[counter].dd:=dd;
asteroid_buffer[counter].a_e:=a_e;
asteroid_buffer[counter].a_or_q :=a_or_q;
asteroid_buffer[counter].a_i:=a_i;
asteroid_buffer[counter].a_ohm:=a_ohm;
asteroid_buffer[counter].a_w:=a_w;
asteroid_buffer[counter].a_M:=a_M; //1E99 if comet
asteroid_buffer[counter].h:=h;
if asteroid then
asteroid_buffer[counter].a_g:=a_g
else
asteroid_buffer[counter].a_g:=c_k;
asteroid_buffer[counter].desn:=desn;
asteroid_buffer[counter].name:=name;
inc(counter);
end;
if frac(count/10000)=0 then
begin
if form_existing then form_asteroids1.caption:=inttostr(count);
application.processmessages;{check for esc}
end;
end;{within FOV}
except
end;
end;
end;{longer then 10}
end;
finally
CloseFile(txtf);
setlength(asteroid_buffer,counter);
end;
end;
procedure replot; //plot for the second image in a series using the existing data in the asteroid_buffer
var
cc : integer;
begin
try
for cc:=0 to length(asteroid_buffer)-1 do
begin
{comet is indicated by a_M:=1E99, Mean anomoly, an abnormal value}
minor_planet(sun200_calculated,jd_mid+delta_t{delta_t in days},
round(asteroid_buffer[cc].yy),
round(asteroid_buffer[cc].mm),
asteroid_buffer[cc].dd,
asteroid_buffer[cc].a_e,
asteroid_buffer[cc].a_or_q,
asteroid_buffer[cc].a_i,
asteroid_buffer[cc].a_ohm,
asteroid_buffer[cc].a_w,
asteroid_buffer[cc].a_M,
{out} ra2,dec2,delta,sun_delta,outdated);
if sqr( (ra2-head.ra0)*cos_telescope_dec) + sqr(dec2-head.dec0)< sqr(fov) then {within the image FOV}
begin
desn:=asteroid_buffer[cc].desn;
name:=asteroid_buffer[cc].name;
if asteroid_buffer[cc].a_M<1E98 {asteroid} then
begin
mag:=asteroid_buffer[cc].h+ ln(delta*sun_delta)*5/ln(10); {log(x) = ln(x)/ln(10)}
phase:=illum_planet; { Get phase comet. Only valid if comet routine is called first.}
mag:=mag+asteroid_magn_comp(a_g{asteroid_slope_factor},phase);
{slope factor =0.15
angle object-sun-earth of 0 => 0 magnitude
5 0.42
10 0.65
15 0.83
20 1}
plot_asteroid(annotation_diameter)
end
else
begin {comet magnitude}
mag:=asteroid_buffer[cc].H+ ln(delta)*5/ln(10)+ a_g{c_k}*ln(sun_delta)/ln(10) ;
plot_asteroid(annotation_diameter*5);
end;
end;{within FOV}
end;// for loop
except
end;
end;//procedure replot
begin
if head.naxis=0 then exit;
if head.cd1_1=0 then begin memo2_message('Abort, first solve the image!');exit;end;
cos_telescope_dec:=cos(head.dec0);
fov:=1.5*sqrt(sqr(0.5*head.width*head.cdelt1)+sqr(0.5*head.height*head.cdelt2))*pi/180; {field of view with 50% extra}
// flip_vertical:=mainwindow.flip_vertical1.Checked;
// flip_horizontal:=mainwindow.flip_horizontal1.Checked;
mainwindow.image1.Canvas.brush.Style:=bsClear;
form_existing:=assigned(form_asteroids1);{form existing}
{$ifdef mswindows}
mainwindow.image1.Canvas.Font.Name :='default';
{$endif}
{$ifdef linux}
mainwindow.image1.Canvas.Font.Name :='DejaVu Sans';
{$endif}
{$ifdef darwin} {MacOS}
mainwindow.image1.Canvas.Font.Name :='Helvetica';
{$endif}
mainwindow.image1.canvas.pen.color:=annotation_color;{color circel}
mainwindow.image1.Canvas.font.color:=annotation_color;
fontsize:=round(min(20,max(10,head.height*20/4176)));
if font_follows_diameter then
begin
fontsize:=max(annotation_diameter,fontsize);
mainwindow.image1.Canvas.Pen.width := 1+annotation_diameter div 10;{thickness lines}
end;
mainwindow.image1.Canvas.font.size:=fontsize;
str(max(1,fontsize/12):0:1,fontsize_str); {store font size for header annotations}
date_to_jd(head.date_obs,head.date_avg,head.exposure);{convert date-OBS to jd_start and jd_mid}
if jd_start<=2400000 then {no date, found year <1858}
begin
mainwindow.error_label1.caption:=('Error converting DATE-OBS or DATE-AVG from the file header!');
mainwindow.error_label1.visible:=true;
memo2_message(filename2+ ' Error converting DATE-OBS or DATE-AVG from the file header!');
exit;
end;
dec_text_to_radians(sitelat,site_lat_radians,errordecode);
if errordecode then memo2_message('Warning observatory latitude not found in the fits header');
dec_text_to_radians(sitelong,site_long_radians,errordecode); {longitude is in degrees, not in hours. East is positive according ESA standard and diffractionlimited}
{see https://indico.esa.int/event/124/attachments/711/771/06_ESA-SSA-NEO-RS-0003_1_6_FITS_keyword_requirements_2014-08-01.pdf}
if errordecode then memo2_message('Warning observatory longitude not found in the fits header');
delta_t:=deltaT_calc(jd_mid); {calculate delta_T in days}
wtime2actual:=fnmodulo(site_long_radians+siderealtime2000 +(jd_mid-2451545 )* earth_angular_velocity,2*pi);{Local sidereal time. As in the FITS header in ASTAP the site longitude is positive if east and has to be added to the time}
sun200_calculated:=false;
sincos(head.dec0,SIN_dec_ref,COS_dec_ref);{do this in advance since it is for each pixel the same}
if add_annot then
begin
remove_key(mainwindow.memo1.lines,'ANNOTATE',true{all});{remove key annotate words from header}
annotated:=false;
end;
if use_buffer then
replot //use asteroid_buffer information
else
begin
counter:=0;//counter for asteroid_buffer. Count both asteroids and comets.
asteroid_buffer:=nil;//remove old data;
setlength(asteroid_buffer,1000);
if mpcorb_path<>'' then
begin
if fileexists(mpcorb_path) then
read_and_plot(true,mpcorb_path)
else
memo2_message('MPCORB.DAT file not found: '+ mpcorb_path+' Set path in Asteroid & Comet annotation menu, CTRL+R' );
end;
if cometels_path<>'' then
begin
if fileexists(cometels_path) then
read_and_plot(false,cometels_path);
// Do not warn for missing comet file.
// else
// memo2_message('CometEls.txt file not found: '+ cometels_path+' Set path in Asteroid & Comet annotation menu, CTRL+R' );
end;
end;//not replot
{write some info at bottom screen}
if form_existing then
begin
with mainwindow do
begin
if add_date then
begin
mainwindow.image1.Canvas.textout(round(0.5*fontsize),head.height-round(4*fontsize),'Position[α,δ]: '+mainwindow.ra1.text+' '+mainwindow.dec1.text);{}
mainwindow.image1.Canvas.textout(round(0.5*fontsize),head.height-round(2*fontsize),'Midpoint date: '+JdToDate(jd_mid)+', total exp: '+inttostr(round(head.exposure))+'s');{}
end;
end;
end;
end;
function test_mpcorb : boolean;
begin
if fileExists(form_asteroids1.mpcorb_path1.caption)=false then
begin
form_asteroids1.mpcorb_path1.Font.color:=clred;
form_asteroids1.mpcorb_filedate1.caption:='No MPCORB.DAT file';
result:=false;
exit;
end
else
begin
form_asteroids1.mpcorb_filedate1.caption:=DateTimeToStr(FileDateToDateTime(FileAge(form_asteroids1.mpcorb_path1.caption)));
form_asteroids1.mpcorb_path1.font.color:=clgreen;
result:=true;
end;
end;
function test_cometels : boolean;
begin
if fileExists(form_asteroids1.mpcorb_path2.caption)=false then
begin
form_asteroids1.mpcorb_path2.Font.color:=clred;
form_asteroids1.mpcorb_filedate2.caption:='No CometEls.txt file';
result:=false;
exit;
end
else
begin
form_asteroids1.mpcorb_filedate2.caption:=DateTimeToStr(FileDateToDateTime(FileAge(form_asteroids1.mpcorb_path2.caption)));
form_asteroids1.mpcorb_path2.font.color:=clgreen;
result:=true;
end;
end;
procedure set_some_defaults; {wil be set if annotate button is clicked or when form is closed}
begin
with form_asteroids1 do
begin
{latitude, longitude}
sitelat:=latitude1.Text;
sitelong:=longitude1.Text;
lat_default:=sitelat;
long_default:=sitelong;
if midpoint=false then
head.date_obs:=date_obs1.Text
else
head.date_avg:=date_obs1.Text;
annotation_color:=ColorBox1.selected;
annotation_diameter:=form_asteroids1.annotation_size2.Position div 2;
end;
end;
procedure Tform_asteroids1.annotate_asteroids1Click(Sender: TObject); {han.k}
var maxcount : integer;
maxmag : double;
begin
set_some_defaults;
font_follows_diameter:=font_follows_diameter1.checked;
maxcount_asteroid:=max_nr_asteroids1.text;
maxcount:=strtoint(form_asteroids1.max_nr_asteroids1.text);
maxmag_asteroid:=max_magn_asteroids1.text;
maxmag:=strtofloat2(form_asteroids1.max_magn_asteroids1.text);
showfullnames:=form_asteroids1.showfullnames1.checked;
showmagnitude:=form_asteroids1.showmagnitude1.checked;
add_annotations:=form_asteroids1.add_annotations1.checked;
add_date:=form_asteroids1.add_subtitle1.checked;
if ((test_mpcorb=false) and (test_cometels=false)) then begin exit; end;{file not found}
mpcorb_path:=form_asteroids1.mpcorb_path1.caption;
cometels_path:=form_asteroids1.mpcorb_path2.caption;
Screen.Cursor:=crHourglass;{$IfDef Darwin}{$else}application.processmessages;{$endif}// Show hourglass cursor, processmessages is for Linux. Note in MacOS processmessages disturbs events keypress for lv_left, lv_right key
plot_mpcorb(maxcount,maxmag,add_annotations,false);
Screen.Cursor:=crDefault;
form_asteroids1.close; {normal this form is not loaded}
mainwindow.setfocus;
end;
procedure Tform_asteroids1.BitBtn1Click(Sender: TObject);
begin
mpcorb_path1.caption:='';
mpcorb_path:='';
test_mpcorb;
end;
procedure Tform_asteroids1.BitBtn2Click(Sender: TObject);
begin
mpcorb_path2.caption:='';
cometels_path:='';
test_cometels;
end;
procedure Tform_asteroids1.cancel_button1Click(Sender: TObject); {han.k}
begin
esc_pressed:=true;
form_asteroids1.close; {normal this form is not loaded}
mainwindow.setfocus;
end;
procedure Tform_asteroids1.download_mpcorb1Click(Sender: TObject);
begin
openurl('https://minorplanetcenter.net/iau/MPCORB.html');
end;
procedure Tform_asteroids1.file_to_add1Click(Sender: TObject); {han.k}
begin
OpenDialog1.Title := 'Select MPCORB.DAT to use';
OpenDialog1.Options := [ofFileMustExist,ofHideReadOnly];
opendialog1.Filter := 'MPCORB, NEA(*.DAT*;*.txt)|*.dat;*.DAT;*.txt';
if opendialog1.execute then
begin
mpcorb_path1.caption:=OpenDialog1.Files[0];
test_mpcorb;
end;
end;
procedure Tform_asteroids1.file_to_add2Click(Sender: TObject);
begin
OpenDialog1.Title := 'Select AllCometEls.txt to use';
OpenDialog1.Options := [ofFileMustExist,ofHideReadOnly];
opendialog1.Filter := 'AllCometEls.txt file (A*.txt)|A*.txt';
if opendialog1.execute then
begin
mpcorb_path2.caption:=OpenDialog1.Files[0];
test_cometels;
end;
end;
procedure Tform_asteroids1.FormClose(Sender: TObject;
var CloseAction: TCloseAction);
begin
set_some_defaults;
end;
procedure Tform_asteroids1.FormKeyPress(Sender: TObject; var Key: char);{han.k}
begin {set form keypreview:=on}
if key=#27 then
begin
esc_pressed:=true;
end;
end;
procedure Tform_asteroids1.FormShow(Sender: TObject);{han.k}
begin
esc_pressed:=false;{reset from cancel}
mpcorb_path1.caption:=mpcorb_path;
test_mpcorb;
mpcorb_path2.caption:=cometels_path;
test_cometels;
if head.date_avg<>'' then
begin
date_label1.caption:='DATE_AVG';
label_start_mid1.caption:='Midpoint of the observation';
date_obs1.Text:=head.date_avg;
midpoint:=true;
end
else
begin
date_label1.caption:='DATE_OBS';
label_start_mid1.caption:='Start of the observation';
date_obs1.Text:=head.date_obs;
midpoint:=false;
end;
max_nr_asteroids1.text:=maxcount_asteroid;
max_magn_asteroids1.text:=maxmag_asteroid;
{latitude, longitude}
if sitelat='' then {use values from previous time}
begin
sitelat:=lat_default;
sitelong:=long_default;
end;
latitude1.Text:=trim(sitelat); {copy the string to tedit}
longitude1.Text:=trim(sitelong);
showfullnames1.Checked:=showfullnames;
showmagnitude1.Checked:=showmagnitude;
add_annotations1.Checked:=add_annotations;
form_asteroids1.add_subtitle1.checked:=add_date;
ColorBox1.selected:=annotation_color;
annotation_size2.position:=annotation_diameter*2;
font_follows_diameter1.checked:=font_follows_diameter;
end;
procedure Tform_asteroids1.Group_Box1Click(Sender: TObject);
begin
mpcorb_path:='';
end;