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astroplan を使って、与えられた場所と年月日における天体の天球面上の移動 の軌跡の図を作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 12:30:24 (CST) daisuke> # # importing argparse module import argparse # importing pathlib module import pathlib # importing sys module import sys # importing numpy module import numpy # importing astropy module import astropy.units import astropy.time import astropy.coordinates # importing astroplan module import astroplan import astroplan.plots # importing matplotlib module import matplotlib.pyplot # units unit_m = astropy.units.m unit_rad = astropy.units.rad unit_deg = astropy.units.deg unit_hour = astropy.units.hour # constructing parser object desc = "making a sky chart" 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 ('-o', '--output', default='airmass.png', \ help='output file name (EPS, PDF, PNG, or PS file)') 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 file_output = args.output list_target = args.target # making pathlib object path_output = pathlib.Path (file_output) if (path_output.exists ()): # printing message print ("ERROR: output file '%s' exists." % file_output) # exit sys.exit () if not ( (path_output.suffix == '.eps') or (path_output.suffix == '.pdf') \ or (path_output.suffix == '.png') or (path_output.suffix == '.ps') ): # printing message print ("ERROR: output file must be either EPS, PDF, PNG, or PS.") # exit sys.exit () # 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') datetime = datetime + numpy.linspace (-8, +8, 100) * unit_hour # processing each target for i in range ( len (list_target) ): # object target = list_target[i] obj = astroplan.FixedTarget.from_name (target) astroplan.plots.plot_sky (obj, observer, datetime) # plotting matplotlib.pyplot.legend (loc='upper left', bbox_to_anchor=(1.05, 1.0) ) matplotlib.pyplot.title ("sky chart") # saving the plot into a file matplotlib.pyplot.savefig (file_output, bbox_inches="tight", dpi=225)
実行してみると、以下のようになるでござる。
% ./astroplan_sample_15.py -h usage: astroplan_sample_15.py [-h] [-l LONGITUDE] [-b LATITUDE] [-a ALTITUDE] [-t DATETIME] [-o OUTPUT] target [target ...] making a sky chart 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 -o OUTPUT, --output OUTPUT output file name (EPS, PDF, PNG, or PS file) % ./astroplan_sample_15.py -t 2022-07-03T16:00:00 -o sky_20220703.png \ ? Arcturus Vega Antares Fomalhaut # # input parameters # # Location: # longitude = +121d11m12s # latitude = +24d58m12s # altitude = 151.6 m # Date/Time: # date/time (UT) = 2022-07-03T16:00:00 # Targets: # Arcturus # Vega # Antares # Fomalhaut # QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-daisuke' % ls -lF *.png -rw-r--r-- 1 daisuke taiwan 174496 Jul 3 12:27 airmass_20220703.png -rw-r--r-- 1 daisuke taiwan 175140 Jul 3 12:33 sky_20220703.png % feh -dF sky_20220703.png
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