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これは日々の作業を通して学んだことや毎日の生活で気づいたことをを記録しておく備忘録である。
HTML ファイル生成日時: 2024/12/23 15:49:04.419 (台灣標準時)
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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