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astroplan を使って、与えられた場所での与えられた時間で天体が見えるかど うか判定するには以下のようにすればよいようでござる。指定した天体が地平 線よりも上にあるのか、下にあるのかを調べてくれるようでござる。
#!/usr/pkg/bin/python3.9 # # Time-stamp: <2022/07/03 10:28:13 (CST) daisuke> # # importing argparse module import argparse # importing astropy module import astropy.units import astropy.time import astropy.coordinates # importing astroplan module import astroplan # units unit_m = astropy.units.m # constructing parser object desc = "visibility check at given location" parser = argparse.ArgumentParser (description=desc) # adding arguments parser.add_argument ('-l', '--longitude', default='+121d11m12s', \ help='longitude of observing site in format "+121d11m12s"') parser.add_argument ('-b', '--latitude', default='+24d58m12s', \ help='latitude of observing site in format "+24d58m12s"') parser.add_argument ('-a', '--altitude', type=float, default=151.6, \ help='altitude above sea-level in metre') parser.add_argument ('-t', '--datetime', default='2000-01-01T12:00:00.000', \ help='date/time in UT in "YYYY-MM-DDThh:mm:ss.sss" format') parser.add_argument ('target', nargs='+', help='names of targets') # command-line argument analysis args = parser.parse_args () # input parameters site_lon = args.longitude site_lat = args.latitude site_alt = args.altitude * unit_m datetime_str = args.datetime list_target = args.target # printing input parameters print ("#") print ("# input parameters") print ("#") print ("# Location:") print ("# longitude =", site_lon) print ("# latitude =", site_lat) print ("# altitude =", site_alt) print ("# Date/Time:") print ("# date/time (UT) =", datetime_str) print ("# Targets:") for target in list_target: print ("# %s" % target) print ("#") # location object location = astropy.coordinates.EarthLocation.from_geodetic \ (site_lon, site_lat, site_alt) # observer object observer = astroplan.Observer (location=location, name="observer", \ timezone="UTC") # time object datetime = astropy.time.Time (datetime_str, scale='utc') # processing target one-by-one for target in list_target: # getting object from name obj = astroplan.FixedTarget.from_name (target) # checking visibility of the object visibility = observer.target_is_up (datetime, obj) # printing result if (visibility): print ("%-16s ==> %s" % (target, 'visible') ) else: print ("%-16s ==> %s" % (target, 'not visible') )
実行してみると、以下のようになるでござる。
% ./astroplan_sample_02.py -h usage: astroplan_sample_02.py [-h] [-l LONGITUDE] [-b LATITUDE] [-a ALTITUDE] [-t DATETIME] target [target ...] visibility check at given location positional arguments: target names of targets optional arguments: -h, --help show this help message and exit -l LONGITUDE, --longitude LONGITUDE longitude of observing site in format "+121d11m12s" -b LATITUDE, --latitude LATITUDE latitude of observing site in format "+24d58m12s" -a ALTITUDE, --altitude ALTITUDE altitude above sea-level in metre -t DATETIME, --datetime DATETIME date/time in UT in "YYYY-MM-DDThh:mm:ss.sss" format % ./astroplan_sample_02.py -t 2022-07-03T12:00:00 Betelgeuse Sirius Procyon \ ? Arcturus Spica Vega Altair Deneb Antares Fomalhaut # # input parameters # # Location: # longitude = +121d11m12s # latitude = +24d58m12s # altitude = 151.6 m # Date/Time: # date/time (UT) = 2022-07-03T12:00:00 # Targets: # Betelgeuse # Sirius # Procyon # Arcturus # Spica # Vega # Altair # Deneb # Antares # Fomalhaut # Betelgeuse ==> not visible Sirius ==> not visible Procyon ==> not visible Arcturus ==> visible Spica ==> visible Vega ==> visible Altair ==> visible Deneb ==> visible Antares ==> visible Fomalhaut ==> not visible