I believe the following are supported by AST (copied from AST documentation):

• "AZEL": Horizon coordinates
• "ECLIPTIC": Ecliptic coordinates (IAU 1980)
• "FK4": The old FK4 (barycentric) equatorial coordinate system
• "FK4-NO-E" or "FK4_NO_E": The old FK4 (barycentric) equatorial system
• "FK5" or "EQUATORIAL": The modern FK5 (barycentric) equatorial coordinate sys-
  tem
• "GALACTIC": Galactic coordinates (IAU 1958)
• "GAPPT", "GEOCENTRIC" or "APPARENT"
• "HELIOECLIPTIC": Ecliptic coordinates (IAU 1980)
• "ICRS": The Internation Celestial Reference System
• "J2000": An equatorial coordinate system based on the mean dynamical equator and
  equinox of the J2000 epoch
• "SUPERGALACTIC": De Vaucouleurs Supergalactic coordinates

Hi All,

Can you remind me which systems we are currently supporting?

I always get confused between ICRS and FK5.

Sincerely,

Greg

Gregory R. Sivakoff
Assistant Professor of Physics
University of Alberta, Edmonton, AB
sivakoff@ualberta.ca

On 2015-06-17 1:58 PM, Pavol Federl wrote:

I believe the following are supported by AST (copied from AST
documentation):

• "AZEL": Horizon coordinates
• "ECLIPTIC": Ecliptic coordinates (IAU 1980)
• "FK4": The old FK4 (barycentric) equatorial coordinate system
• "FK4-NO-E" or "FK4_NO_E": The old FK4 (barycentric) equatorial system
• "FK5" or "EQUATORIAL": The modern FK5 (barycentric) equatorial
  coordinate sys- tem
• "GALACTIC": Galactic coordinates (IAU 1958)
• "GAPPT", "GEOCENTRIC" or "APPARENT"
• "HELIOECLIPTIC": Ecliptic coordinates (IAU 1980)
• "ICRS": The Internation Celestial Reference System
• "J2000": An equatorial coordinate system based on the mean
  dynamical equator and equinox of the J2000 epoch
• "SUPERGALACTIC": De Vaucouleurs Supergalactic coordinates

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#53 (comment).

No, I'm sorry I don't know how much supergalactic. Perhaps Jeff would
know or could refer
you to someone who does.
Susan

On 06/17/2015 01:47 PM, Erik Rosolowsky wrote:

@pfederl https://github.com/pfederl -- Does ASTlib support a
supergalactic reference frame on top of J2000, B1950, Ecliptic etc.
It's a supported frame in CASA viewer and we should include it if it's
already in ASTlib.

@slovelan https://github.com/slovelan -- Do you know if
supergalactic is actually used much by the casaviewer community?

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All right, let's go with the following in order

• "NATIVE" -- The file co-ordinate system.
• "FK5 / J2000" -- The default equinox of FK5 is J2000
• "GALACTIC"
• "ICRS" -- The IAU standard but surprisingly less common.
• "ECLIPTIC"
• "FK4 / B1950" -- The default equinox of FK4 is B1950
• "SUPERGALACTIC"

The "NATIVE" uses the system of the file. It may not be the system given here but ASTlib may happily parse it and give grids. Would that work?

I think if someone wants non-standard equinox for FK5 then they can write a plugin!