Specification for Hipparcos catalogue

1. Overview

This class read the csv file of Hipparcos catalogue and to enable other classes to use the data.
Specify the max visual magnitude to read in sample_simulation_base.ini

1. functions

ReadContents
- Function to read hip_main.csv
Get functions

Functions to access the data of HipparcosCatalogue from outside of this class

2. files

HipparcosCatalogue.cpp ，HipparcosCatalogue.hpp
- Definitions and declarations of the class
sample_simulation_base.ini
- Parameters for initialization
hip_main.csv
- This is the original data of the Hipparcos catalogue. It is in the ExtLibraries directory. This data is sorted in of the visual magnitude, not in the order of HIP ID.

3. How to download `hip_main.csv`

s2e-core/scripts/download_HIPcatalogue.sh is the script to download it. Run the following code using Git bash in s2e-core/scripts/．
- NOTE for Mac OS users: Run the following script not from the Mac terminal but the Ubuntu terminal in Docker. (Because the specification of sed is different between Mac and Linux, the file cannot be generated correctly. Reference: https://qiita.com/catfist/items/1156ae0c7875f61417ee)
```
bash download_HIPcatalogue.sh 
```

4. How to use

Set the parameters in sample_simulation_base.ini
Create an instance by using initialization function InitHipparcosCatalogue
Run GetContents to read the csv file
Get the data from outside this class using Get functions.
The HipparcosData structure has four elements, hipparcos_id, visible_magnitude, right_ascension_deg, declination_deg. HipparcosCatalogue stores the data as a vector of HipparcosData.

2. Explanation of Algorithm

TBW

3. Result of verification

The verification using this class is conducted in Spec_Telescope.md.