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astroplan を使って、与えられた場所と時刻における天体の方位角、高度、エ アマスを調べるには以下のようにすればよいようでござる。
#!/usr/pkg/bin/python3.9 # # Time-stamp: <2022/07/03 12:05:19 (CST) daisuke> # # importing argparse module import argparse # importing numpy module import numpy # importing astropy module import astropy.units import astropy.time import astropy.coordinates # importing astroplan module import astroplan # units unit_m = astropy.units.m unit_rad = astropy.units.rad unit_deg = astropy.units.deg # constructing parser object desc = "finding (Az, Alt) of targets at given location and date/time" 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='+', default='Vega', \ 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 each target for target in list_target: # object obj = astroplan.FixedTarget.from_name (target) # alt and az of target obj_altaz = observer.altaz (datetime, obj) # printing results print ("Object = %s" % target) print (" Az: %s" % obj_altaz.az) print (" Alt: %s" % obj_altaz.alt) print (" airmass: %s" % obj_altaz.secz)
実行してみると、以下のようになるでござる。
% ./astroplan_sample_12.py -h usage: astroplan_sample_12.py [-h] [-l LONGITUDE] [-b LATITUDE] [-a ALTITUDE] [-t DATETIME] target [target ...] finding (Az, Alt) of targets at given location and date/time 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_12.py -t 2022-07-03T12:00:00 Arcturus # # input parameters # # Location: # longitude = +121d11m12s # latitude = +24d58m12s # altitude = 151.6 m # Date/Time: # date/time (UT) = 2022-07-03T12:00:00 # Targets: # Arcturus # Object = Arcturus Az: 234d53m21.43655051s Alt: 80d10m03.68792195s airmass: 1.014907199287343 % ./astroplan_sample_12.py -t 2022-07-03T12:00:00 Arcturus Vega Antares # # input parameters # # Location: # longitude = +121d11m12s # latitude = +24d58m12s # altitude = 151.6 m # Date/Time: # date/time (UT) = 2022-07-03T12:00:00 # Targets: # Arcturus # Vega # Antares # Object = Arcturus Az: 234d53m21.43655051s Alt: 80d10m03.68792195s airmass: 1.014907199287343 Object = Vega Az: 59d15m10.58369985s Alt: 40d41m03.68181387s airmass: 1.5339978881901648 Object = Antares Az: 153d06m51.22002566s Alt: 33d09m50.0285802s airmass: 1.8280337450008604