""" StarCatalog """
import math
from .star import Star
from .catalog import Catalog
# class name should be "Catalog" following by the name of the catalog - this is used elsewhere
[docs]
class CatalogHYG(Catalog):
""" CatalogHYG()
HYG (Hipparcos, Yale, Gliese)
http://www.astronexus.com/hyg
https://github.com/astronexus/HYG-Database
"""
# base_url = 'https://github.com/astronexus/HYG-Database/' + 'raw/master/hyg/v3/'
base_url = 'https://github.com/astronexus/HYG-Database/' + 'raw/main/hyg/CURRENT/'
source_files = [
# 'hyg_v37.csv',
'hygdata_v41.csv'
]
def _readstarfile(self, directory, max_mag, star_append):
""" _readstarfile() """
filename = directory + '/' + self.source_files[0]
# "id","hip","hd","hr","gl","bf","proper","ra","dec","dist","pmra","pmdec","rv","mag", ...
# 0,,,,"","",Sol,0.0,0.0,0.0,0.0,0.0,0.0,-26.7, ...
# 1,1,224700,,"","","",0.00006,1.089009,219.7802,-5.2,-1.88,0.0, ...
# 2,2,224690,,"","","",0.000283,-19.49884,47.9616,181.21,-0.93,0.0, ...
n_lines = 0
with open(filename, 'r', encoding='utf-8') as fd:
for line in fd.readlines():
n_lines += 1
if n_lines == 1:
continue
# This CSV file does not have quotes - so we we can do this quickly
a = line.rstrip().split(',')
proper = a[7-1]
if proper == 'Sol':
continue
hip = a[3-1]
ra = a[8-1]
dec = a[9-1]
mag = a[14-1]
try:
hip = int(hip)
except ValueError:
hip = None
if len(proper) > 2 and proper[0] == '"' and proper[-1] == '"':
proper = proper[1:-1]
if len(proper) == 0:
proper = None
try:
ra_f = math.radians(float(ra)*15)
except ValueError:
ra_f = float('nan')
try:
dec_f = math.radians(float(dec))
except ValueError:
dec_f = float('nan')
try:
mag_f = float(mag)
if max_mag and mag_f >= max_mag:
continue
except ValueError:
mag_f = float('nan')
star_append(Star(hip, proper, None, ra_f, dec_f, mag_f))
return n_lines