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sky_map.py
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sky_map.py
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# TODO: different stars sizes dependending on their flux
# TODO: map where only FOV and center is a current 'polar star' analogue (zenith)
# TODO: case when not all stars were downloaded
# TODO: implement constellations as graphs
# TODO: implement map as custom axes projection (see
# https://matplotlib.org/gallery/misc/custom_projection.html#sphx-glr-gallery-misc-custom-projection-py)
import sys, os
import numpy as np
import matplotlib.pyplot as plt
import astropy.time
from astropy.coordinates import EarthLocation
import astropy.units as u
import astropy.table
from datetime import datetime, timedelta
import time
from util import extract_forms, extract_constellations, prepare_skymap, plot_fov, plot_moon,\
plot_sun, plot_solarsystem, plot_iss, fonts, plot_size
from dl_constellations import constellations as constellations_dict
#
# Set desired location here. Specify name (required for caption), choose online/offline
# flag and in the last case also set latitude, longitude and altitude in the class Loc
#
location_str = "Syktyvkar"
internet_geolocation = 1
if not internet_geolocation:
class Loc:
"""
Hard-coded location. You can use it instead of Internet geolocationing
"""
latitude = 61.40
longitude = 50.49
altitude = 100
address = location_str
#
# Leave custom_time=None or custom_time=0 to use current OS time or specify
# the custom time as datetime(year, month, day, hours, minutes, seconds, ms)
#
custom_time = None # datetime(2018, 4, 29, 0, 38, 42, 00000)
#
# Choose what TLE to use (only one key at a time can have '1' value).
# 'internet': use pyobject to retrieve TLE
# 'internet_by_url': use custom URL to download TLE
# 'local': specify list for TLE by yourself
# Set all keys to '0' values to skip ISS plotting
#
tle_type = { 'internet': 1,
'internet_by_url': 0,
'local': 0 }
tle_url = 'https://www.celestrak.com/NORAD/elements/stations.txt'
tle_local = [ '1 25544U 98067A 18116.84910257 .00002058 00000-0 38261-4 0 9992',
'2 25544 51.6422 274.6376 0002768 23.1132 122.6984 15.54167281110534' ]
#
# get necessary data
#
# read stars table database from the file to Table object
if os.path.isfile('stars.html'):
stars = astropy.table.Table.read('stars.html')
else:
print("'stars.html' not found. Run 'dl_constellations.py'")
sys.exit()
# generate constellations forms if there is no one
if not os.path.isfile('.constellations.html'):
constellations_forms = extract_forms(constellations_dict, stars)
constellations_forms.write('.constellations.html', format='ascii.html', overwrite=True)
else:
constellations_forms = astropy.table.Table.read('.constellations.html')
# exctract each constellation
constellations = extract_constellations(stars)
#
# make plot field
#
fig,ax = prepare_skymap(fontsize=fonts['skymap'])
#
# plotting constellations
#
for constellation,constellation_form in zip(constellations,constellations_forms['idxs']):
constellation_form = [int(s) for s in constellation_form.split()]
# put stars on plot and connect them by pairs
for i,iplus1 in zip(constellation_form[:-1], constellation_form[1:]):
ax.plot( np.radians([ constellation['RA'][i], constellation['RA'][iplus1] ]),
[ -constellation['dec'][i]+45, -constellation['dec'][iplus1]+45 ],
color='skyblue', marker=None, linewidth=2.0 )
# put name of constellation beside its first star
ax.text( np.radians(constellation['RA'][0]),
-constellation['dec'][0]+45,
"{}".format(constellation['Constellation'][0]),
fontsize=fonts['const_name'], weight='bold' )
# print progress
print("\r{} plotted".format(constellation['Constellation'][0]).ljust(80), end='')
print('\rconstellations are plotted'.ljust(80))
#
# handle observation geolocation
#
location = None
if internet_geolocation:
# request geolocation by string
print("request geolocation via geopy...")
from geopy.geocoders import Nominatim as geocoder
location = geocoder().geocode(location_str, timeout=5)
else:
location = Loc()
if location is not None:
print("observation location: " + location.address)
obs_loc = EarthLocation( lat=location.latitude*u.deg,
lon=location.longitude*u.deg,
height=location.altitude*u.m )
else:
print("NO LOCATION") # we can't proceed without location
sys.exit()
#
# handle observation time
#
obs_time = None
# Moscow time: 3*u.hour (or datetime.now()-datetime.utcnow())
utc_offset = (time.timezone if (time.localtime().tm_isdst==0) else time.altzone)/60/60*-1
if custom_time:
from math import modf
obs_time = astropy.time.Time( custom_time - timedelta( hours=modf(utc_offset)[1],
minutes=modf(utc_offset)[0] ) )
else:
obs_time = astropy.time.Time( datetime.utcnow() )
if not obs_time:
print("NO TIME") # we can't proceed without time
sys.exit()
#
# plot current field-of-view, planets, Moon, Sun
#
plot_fov(ax, obs_time, obs_loc, fontsize=fonts['fov'])
plot_moon(ax, obs_time, obs_loc)
plot_sun(ax, obs_time)
plot_solarsystem(ax, obs_time, obs_loc)
#
# plot ISS (or just skip)
#
tle = None
if 1 in tle_type.values():
if tle_type['internet']:
pass
elif tle_type['internet_by_url']:
import urllib.request
print("request ISS' two-line elements from URL...")
with urllib.request.urlopen(tle_url) as tle_file:
tle = [line.decode('utf-8')[:-2] for line in tle_file][1:3]
elif tle_type['local']:
tle = tle_local
plot_iss(ax, obs_time, obs_loc, tle=tle)
else:
pass
#
# title, capture with location & time and legend
#
fig.suptitle( "Star map of the\nnorthern semisphere",
fontsize=fonts['title'], fontname="Andale Mono",
x=plot_size+(plot_size/7),y=(plot_size/2)+(plot_size/6) )
fig.text( plot_size+(plot_size/7), (plot_size/2)-0.025,
"{0}, ( {1:.2f}, {2:.2f} )\n\
{3}\n".format( location_str, obs_loc.lat, obs_loc.lon,
str(obs_time + (utc_offset*u.hour)) ),
fontsize=20, fontname="Andale Mono",
horizontalalignment='center', verticalalignment='center' )
ax.legend( labelspacing=4, fontsize=fonts['legend'], handletextpad=2, borderpad=2,
ncol=5, bbox_to_anchor=(1+0.75, 0.425) )
plt.show()