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get_ephemeris.py
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get_ephemeris.py
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import datetime
import yaml
from astropy.time import Time
from matplotlib import ticker
from common import load_configuration
__author__ = 'william'
import ephem
import ConfigParser
import numpy as np
import matplotlib.pyplot as plt
try:
from astroquery.simbad import Simbad
except:
Simbad = None
fig = plt.figure(1, figsize=(14, 8))
plt.clf() # Only for interactive mode.
ax = plt.axes()
class ObjectTooLowException(Exception):
pass
class ProgramExpiredException(Exception):
pass
def read_tle(fname):
f = open(fname, 'r')
tlines = []
for line in f:
if line.strip() != '' and line[0] != '#':
tlines.append(line)
tle = ephem.readtle(tlines[0], tlines[1], tlines[2])
f.close()
return tle
def calc_ephem(object, aux_i, tag=None, duration=None, start=None):
# Calculate altitudes for the night
aux = []
moondist = []
for dt in alt_dates:
observer.date = dt
object.compute(observer)
aux.append(object.alt * 57.2957795)
# Calulate the moon separation
moondist.append(ephem.separation(moon, object) * 57.2957795)
line, = ax.plot(alt_dates, aux, label=aux_i)
if duration is not None:
if start is not None:
# 1.1574074074074073e-05 = 1. day /24 hours /3600. secs
t = np.linspace(t0, t0 + duration * 1.1574074074074073e-05, 20)
aux2 = np.zeros_like(t)
for i, dt in enumerate(t):
observer.date = dt
object.compute(observer)
aux2[i] = object.alt * 57.2957795
# observer.date = (sunrise - sunset) / 2.
ylim = plt.ylim()
plt.fill_between(t, aux2, ylim[0], color=line.get_color(), alpha=.3) # , color='black')
plt.ylim(ylim)
# Fill in RED zones where moondist is too close
try:
moondist_max = c.getfloat("observatory", "max_moondist")
mask = np.array(moondist) < moondist_max
if mask.sum() > 0:
print 'moon too close for %s' % tag
ylim = plt.ylim()
plt.fill_between(np.array(alt_dates)[mask], np.array(aux)[mask], ylim[0], color='red',
alpha=0.3) # , alpha=.3) # , color='black')
except ConfigParser.NoSectionError:
pass
if tag is not None:
if start is None:
aux_arg = np.argmax(aux)
x, y = alt_dates[aux_arg], aux[aux_arg] + .5
else:
x, y = start, np.interp(start, alt_dates, aux)
plt.plot(x, y, '.', color='black')
plt.text(x, y, tag)
if output_chimera:
while True:
for exptime in [30]: # (2, 5, 10, 15, 30, 60):
expnumber = 5
observer.date = ephem.now()
object.compute(observer)
moon.compute(observer)
# cmd = "ssh lna chimera-tel --slew --ra %s --dec %s && ssh lna chimera-cam --binning 2x2 --object '%s' --output %s -t %i -n %i # mag = %s moondist = %s" % (
# object.ra, object.dec, aux_i, aux_i.replace(' ', '_'), exptime, expnumber, object.mag, ephem.separation(moon, object))
# print cmd
# os.system(cmd)
# os.system("say done")
# time.sleep(1)
# for i in range(5):
# print("\a")
# sleep(.2)
if output_ingstaralt:
print "%s %s %s" % (aux_i.replace(" ", "_"), object.ra, object.dec)
if output_chimera_sched:
print '%s %s J2000 OBJECT "%s" NREP*(FILTER:TEXP)' % (object.ra.__str__(), object.dec.__str__(), aux_i)
def format_date(date, pos):
return ephem.date(date).__str__().split(' ')[1].rpartition(':')[0]
c = load_configuration()
output_chimera = c.getboolean("output", "output_chimera")
output_ingstaralt = c.getboolean("output", "output_ingstaralt")
output_chimera_sched = c.getboolean("output", "output_chimera_sched")
try:
tle_list = c.get("satellite_ephemeris", "tle_list").split(',')
except ConfigParser.NoSectionError, ConfigParser.NoOptionError:
tle_list = None
# Read Ephemeris file
objects_id = []
objects_ephem = []
try:
with open("%s" % c.get("ephemeris", "data_file")) as f:
for line in f:
if not line.startswith('#'):
objects_id.append(line.split(',')[0])
objects_ephem.append(line)
except ConfigParser.NoSectionError:
pass
except TypeError:
pass
# Compute Observatory
observer = ephem.Observer()
observer.lat = c.get("observatory", "latitude")
observer.lon = c.get("observatory", "longitude")
observer.elevation = c.getfloat("observatory", "elevation")
# Compute next sunset and next sunrise
time_offset = 1 if (0 <= datetime.datetime.now().hour < 8) else 0
sunset = observer.next_setting(ephem.Sun(), start=datetime.date.today()) - time_offset
observer.date = sunset
sunrise = observer.next_rising(ephem.Sun())
alt_dates = np.linspace(sunset - 0.015, sunrise + 0.015, 100) # For the graph
# Compute Ephemeris
alt = [] # For object altitudes
# Moon
# Load ephem of the desired object
moon = ephem.Moon()
# Calculate altitudes for the night
aux = []
for dt in alt_dates:
observer.date = dt
moon.compute(observer)
aux.append((moon.alt / np.pi) * 180)
ax.plot(alt_dates, aux, '--', label="Moon")
# Minimum alt
try:
ax.hlines(c.getfloat("observatory", "min_alt"), ax.get_xlim()[0], ax.get_xlim()[1], color='purple')
except ConfigParser.NoSectionError:
pass
# RA, DEC file
try:
f = open(c.get("ephemeris", "radec_file"))
for l in f.readlines():
if not l.startswith('#'):
d = l.replace('\n', '').split(',')
# Calculate coordinates
object = ephem.FixedBody()
ra, dec = d[1:3]
if ':' in ra:
object._ra = ephem.hours(ra)
else:
object._ra = ephem.degrees(ra)
object._dec = ephem.degrees(dec)
calc_ephem(object, d[0])
except: # ConfigParser.NoOptionError:
pass
# Satellite "TLE" ephemeris files
if tle_list is not None:
for tle in tle_list:
tle_file = "%s/%s" % (c.get("satellite_ephemeris", "tle_dir"), tle)
tle_data = read_tle("%s.tle" % tle_file)
calc_ephem(tle_data, "tle_%s" % tle)
t = 0
i_sched = 0
object = None
now = ephem.now()
t0 = float(sunset) if now < sunset else (float(now) - time_offset)
t_start_night = t0
try:
with open(c.get("ephemeris", "chimera-sched_file")) as f:
data = yaml.load(f)
for prog in data['programs']:
try:
if 'startAt' in prog and 'validFor' in prog:
start_at = float(ephem.Date(Time(float(prog['startAt']), format='mjd').datetime))
t0 = start_at
if start_at + float(prog['validFor']) * ephem.second < t0:
raise ProgramExpiredException
print "Start at set to ", start_at, " with t0 ", t0
else:
start_at = t0
t = 0
for action in prog['actions']:
if action['action'] == 'point':
if 'ra' in action:
object = ephem.FixedBody()
object._ra = ephem.hours(action['ra'])
object._dec = ephem.degrees(action['dec'])
elif 'name' in action and not "alt" in action:
if Simbad is not None:
target = Simbad.query_object(action["name"])[0]
object = ephem.FixedBody()
object._ra = ephem.hours(str(target['RA']))
object._dec = ephem.degrees(str(target['DEC']))
else:
print 'Skipping %i. This script does not support name searches yet.' % i_sched
if 'name' in action:
object.name = action["name"]
if object is not None:
# Calulate t0 for min_alt
try:
min_alt = c.getfloat("observatory", "min_alt")
observer.date = start_at
object.compute(observer)
aux_t0 = start_at
while object.alt * 57.2957795 < min_alt:
observer.date = aux_t0
object.compute(observer)
aux_t0 += 1e-2
# If the next time object is above min_alt is after sunset, break the loop and go to next object
if aux_t0 < sunrise:
start_at = aux_t0
else:
title = 'scheduler_%i' % i_sched if len(object.name) == 0 else object.name + " (%i)" % (
i_sched + 1)
calc_ephem(object, title)
i_sched += 1
raise ObjectTooLowException
except ConfigParser.NoSectionError:
print "WARN: no min_alt configured!"
pass
if start_at is not None:
start_at += (t * 1.1574074074074073e-05)
elif action['action'] == 'expose':
t += action['exptime'] * action['frames']
try:
t += c.getfloat("telescope_times", "exposure_overhead") * action['frames']
t += c.getfloat("telescope_times", "point_overhead")
except:
pass
elif action['action'] == 'autofocus':
try:
if 'exptime' in action:
t += float(c.get("telescope_times", "autofocus_fit"))
else:
t += float(c.get("telescope_times", "autofocus_model"))
except:
pass
elif action['action'] == 'pointverify':
t += float(c.get("telescope_times", "pverify_overhead"))
if 'startAt' in prog:
x = float(ephem.Date(Time(float(prog['startAt']), format='mjd').datetime))
if x > t_start_night:
if start_at < x:
start_at = x
else:
observer.date = ephem.Date(Time(float(prog['startAt']), format='mjd').datetime)
object.compute(observer)
aux_min_alt = object.alt
while object.alt < aux_min_alt:
observer.date = start_at
object.compute(observer)
start_at += 1e-2
print("start_at < night start for object %s. Correct it with:\n startAt: %f" % (
object.name, Time(ephem.Date(start_at).datetime(), format="datetime").mjd))
object_name = object.name if object is not None else "None"
title = 'scheduler_%i' % i_sched if len(object_name) == 0 else object_name + " (%i)" % (i_sched + 1)
if t > 0:
calc_ephem(object, title, tag='%s' % (i_sched + 1), duration=t, start=start_at)
print title, Time(ephem.Date(start_at).datetime(), format="datetime").mjd, t
t0 = ephem.Date(ephem.Date(t0).datetime() + datetime.timedelta(seconds=t))
i_sched += 1
except ObjectTooLowException:
print "Object %i is too low." % i_sched
except ProgramExpiredException:
print "Object %i EXPIRED." % i_sched
# if not plot:
# calc_ephem(object, 'scheduler_%i' % i_sched, tag='%s' % (i_sched + 1), duration=t, start=t0)
# t0 += (t * 1.1574074074074073e-05)
except ConfigParser.NoOptionError:
pass
# for id_object in sys.argv[1:]:
# aux_i = np.argwhere(np.array([a.startswith(id_object) for a in objects_id]))
# if len(aux_i) == 0:
# print 'Couldn\'t find object on ephem database: %s' % id_object
# else:
# # Load ephem of the desired object
# object = ephem.readdb(objects_ephem[aux_i[0]])
# calc_ephem(object, objects_id[aux_i])
ax.xaxis.set_major_formatter(ticker.FuncFormatter(format_date))
ax.legend(loc='upper center', ncol=5, fancybox=True, framealpha=0.5)
ylim = ax.get_ylim()
ax.set_ylim(10, 90)
ax.set_xlim(sunset - 0.015, sunrise + 0.015)
ax.set_xlabel('UTC time')
ax.set_ylabel('Altitude (deg)')
plt.title("%i / %s @ latitude: %s - longitude: %s" % (
np.ceil(float(sunset.__str__().split(' ')[0])), c.get("observatory", "name"), observer.lat, observer.long))
plt.grid()
ymin, ymax = plt.ylim()
plt.vlines(sunset, ymin, ymax, color='gray')
plt.vlines(sunrise, ymin, ymax, color='gray')
plt.vlines(ephem.now(), ymin, ymax, color='black', linestyles='dashed')
try:
plt.savefig(c.get('plot', 'outfile'))
except ConfigParser.NoSectionError, ConfigParser.NoOptionError:
pass