def distanceToSun(self):
"""
Find the distance between the Sun and the target pointings
"""
lofar = Observer()
lofar.lon = '6.869882'
lofar.lat = '52.915129'
lofar.elevation = 15.*u.m
lofar.date = self.startTime
# Create Sun object
sun = Sun()
sun.compute(lofar)
# Create the target object
target = FixedBody()
target._epoch = '2000'
target._ra = self.coordPoint1.ra.radian
target._dec = self.coordPoint1.dec.radian
target.compute(lofar)
print 'INFO: Sun is {:0.2f} degrees away from {}'.format(\
float(separation(target, sun))*180./np.pi, self.namePoint1)
target._ra = self.coordPoint2.ra.radian
target._dec = self.coordPoint2.dec.radian
target.compute(lofar)
print 'INFO: Sun is {:0.2f} degrees away from {}'.format(\
float(separation(target, sun))*180./np.pi, self.namePoint2)
def _isVisible(self, coord, startTime, duration):
"""
For a given source and datetime, check if the source is visible
during the specified duration. Not that the horizon here is
the elevation specified by the user. Note that the coordinate of
source is specified as 'RA;Dec'
"""
endTime = startTime + datetime.timedelta(hours=duration)
time = startTime
while time < endTime:
lofar = Observer()
lofar.lon = '6.869882'
lofar.lat = '52.915129'
lofar.elevation = 15.
lofar.date = time
target = FixedBody()
target._epoch = '2000'
coordTarget = SkyCoord('{} {}'.format(coord.split(';')[0], \
coord.split(';')[1]), \
unit=(u.hourangle, u.deg))
target._ra = coordTarget.ra.radian
target._dec = coordTarget.dec.radian
target.compute(lofar)
targetElevation = float(target.alt) * 180. / np.pi
if targetElevation < self.elevation:
return False
time += datetime.timedelta(minutes=15)
# Turns out this source is above the horizon
return True
def init_groundstation():
# Ground station stuff
gs_lat = 39.50417
gs_lon = -80.218615
gs_el_meters = 359.664
gs_tzname = 'US/Eastern'
groundstation_name = 'Fairmont'
gs_minimum_elevation_angle = 10.0
gs_observer = Observer()
gs_observer.lat = gs_lat * math.pi / 180.0
gs_observer.lon = gs_lon * math.pi / 180.0
gs_observer.elevation = gs_el_meters
# Times we need
now = datetime.now()
tomorrow = now + timedelta(1)
gs_observer.date = now
#now += timedelta(hours=14) # testing
#tomorrow = now + timedelta(hours=4) # testing
gs_tz = timezone(gs_tzname)
gs_start = gs_tz.localize(now)
gs_end = gs_tz.localize(tomorrow)
#print(gs_start)
#print(gs_end)
gs = GroundStation.from_location(gs_lat, gs_lon, \
gs_el_meters, \
gs_tzname, \
groundstation_name, \
gs_minimum_elevation_angle)
return [gs, gs_observer, gs_tz, gs_start, gs_end]
def iridium_tle(fn,T,sitella,svn):
assert isinstance(svn,int)
assert len(sitella)==3
assert isinstance(T[0],datetime),'parse your date'
fn = Path(fn).expanduser()
#%% read tle
with fn.open('r') as f:
for l1 in f:
if int(l1[2:7]) == svn:
l2 = f.readline()
break
sat = readtle('n/a',l1,l2)
#%% comp sat position
obs = Observer()
obs.lat = str(sitella[0]); obs.lon = str(sitella[1]); obs.elevation=float(sitella[2])
ecef = DataFrame(index=T,columns=['x','y','z'])
lla = DataFrame(index=T,columns=['lat','lon','alt'])
aer = DataFrame(index=T,columns=['az','el','srng'])
for t in T:
obs.date = t
sat.compute(obs)
lat,lon,alt = degrees(sat.sublat), degrees(sat.sublong), sat.elevation
az,el,srng = degrees(sat.az), degrees(sat.alt), sat.range
x,y,z = geodetic2ecef(lat,lon,alt)
ecef.loc[t,:] = column_stack((x,y,z))
lla.loc[t,:] = column_stack((lat,lon,alt))
aer.loc[t,:] = column_stack((az,el,srng))
return ecef,lla,aer
def test_moon_day_calculation_twelve(self, observer: Observer, moon: Moon,
dt, number):
moon.use_twelve_algorithm = True
observer.date = dt
moon.compute(observer)
assert moon.get_day()['number'] == number, (dt,
moon.get_day()['number'],
number)
def findHBACalibrator(self, time, exclude=None):
"""
For a given datetime, return the ``best'' flux density calibrator
for an HBA observation.
"""
# Create the telescope object
# The following values were taken from otool.py which is part of the
# LOFAR source visibility calculator.
lofar = Observer()
lofar.lon = '6.869882'
lofar.lat = '52.915129'
lofar.elevation = 15.
lofar.date = time
# Create a target object
# If multiple targets are specified, use the first one
target = FixedBody()
target._epoch = '2000'
coordTarget = SkyCoord('{} {}'.format(\
self.targetRA[0],
self.targetDec[0]),
unit=(u.hourangle, u.deg))
target._ra = coordTarget.ra.radian
target._dec = coordTarget.dec.radian
target.compute(lofar)
targetElevation = float(target.alt) * 180. / np.pi
# Create the calibrator object
calibrator = FixedBody()
calibrator._epoch = '2000'
calName = []
calibElevation = []
if exclude is not None:
self.validCalibs.remove(exclude)
for item in self.validCalibs:
myCoord = self._getCalPointing(item)
calibrator._ra = myCoord.split(';')[0]
calibrator._dec = myCoord.split(';')[1]
calibrator.compute(lofar)
tempElevation = float(calibrator.alt) * 180. / np.pi
#print 'Temp is', tempElevation
#if tempElevation > self.elevation:
# calName.append(item)
# calibElevation.append(tempElevation)
#print calibElevation
calName.append(item)
calibElevation.append(tempElevation)
if calibElevation[np.argmax(calibElevation)] < self.elevation:
showWarningPopUp('One of the chosen calibrator is below user '+\
'specified elevation [{} degrees].'.format(self.elevation) +\
' Will generate text file anyway.')
return calName[np.argmax(calibElevation)]
def rise_and_set(lat, lon, horizon=0):
sun = Sun()
date = None
while True:
loc = Observer()
loc.horizon = str(horizon)
loc.lat = str(lat)
loc.lon = str(lon)
loc.date = clock.now()
#if date:
# loc.date = date
#loc.date = loc.date.datetime().date() # strip time
t_rise = loc.next_rising(sun)
t_set = loc.next_setting(sun)
#date = yield localtime(t_rise), localtime(t_set)
yield localtime(t_rise), localtime(t_set)
def findCalibrator(self, time):
"""
For a given datetime, return a list of calibrators that are above
the minimum elevation limit.
"""
# Create the telescope object
# The following values were taken from otool.py which is part of the
# LOFAR source visibility calculator.
lofar = Observer()
lofar.lon = '6.869882'
lofar.lat = '52.915129'
lofar.elevation = 15.*u.m
lofar.date = time
# Create the target object
target = FixedBody()
target._epoch = '2000'
target._ra = self.coordPoint1.ra.radian
target._dec = self.coordPoint1.dec.radian
target.compute(lofar)
targetElevation = float(target.alt)*180./np.pi
# Create the calibrator object
calibrator = FixedBody()
calibrator._epoch = '2000'
calName = []
distance = []
for item in self.validCals:
myCoord = getCalPointing(item)
calibrator._ra = myCoord.split(';')[0]
calibrator._dec = myCoord.split(';')[1]
calibrator.compute(lofar)
tempElevation = float(calibrator.alt)*180./np.pi
if tempElevation > self.elevation:
calName.append(item)
distance.append(np.absolute(tempElevation-targetElevation))
return calName[np.argmin(distance)]
initial_date = f[0].header['DATE-OBS']
##Change in to oskar date format
date, time = initial_date.split('T')
year, month, day = date.split('-')
oskar_date = "%s-%s-%s %s" % (day, month, year, time)
time_int = float(options.time_int)
low_freq = float(options.low_freq)
##ephem Observer class, use this to compute LST from the date of the obs
MRO = Observer()
##Set the observer at Boolardy
MRO.lat, MRO.long, MRO.elevation = '-26:42:11.95', '116:40:14.93', 0
date, time = initial_date.split('T')
MRO.date = '/'.join(date.split('-')) + ' ' + time
intial_lst = float(MRO.sidereal_time()) * R2D
initial_ra_point = float(f[0].header['RA'])
dec_point = float(f[0].header['DEC'])
healpix = options.healpix
telescope_dir = options.telescope
telescope_name = options.telescope.split('/')[-1]
#template_uvfits = fits.open("%s/template_%s.uvfits" %(telescope_dir,telescope_name))
#template_data = template_uvfits[0].data
#template_baselines = template_uvfits[0].data['BASELINE'].copy()
#num_baselines = len(template_data)
num_stations = 512
num_baselines = (num_stations - 1) * (num_stations / 2)
def main():
# arguments
from argparse import ArgumentParser
args = ArgumentParser(
epilog=
"""This script will compute the local coordinates (altitude and azimuth) for Jupiter
and Saturn for the given date. Altitude is degrees above the horizon and azimuth is degrees eastwards from North. Locate North
by finding the Polaris, the pole star.""")
args.add_argument(
"-x",
"--longitude",
type=float,
default=-74.151494,
help=
"East longitude of the observer in decimal degrees. West is negative.")
args.add_argument(
"-y",
"--latitude",
type=float,
default=40.373545,
help="North latitude of the observer. South is negative.")
args.add_argument("-t",
"--timezone",
type=str,
default='US/Eastern',
help="The local time-zone of the observer.")
args.add_argument("-e",
"--elevation",
type=float,
default=20e0,
help="Elevation in metres above sea level.")
args.add_argument(
"time",
nargs='?',
default=datetime.now().strftime("%H:%M:%S"),
help="Local time for calculation, default is current time, as HH:MM:SS."
)
args.add_argument(
"date",
nargs='?',
default=datetime.now().strftime("%Y-%m-%d"),
help=
"Local date for calculation, default is current date, as YYYY-MM-DD.")
args = args.parse_args()
# time
localtime = timezone(args.timezone)
utc = timezone('UTC')
timestamp = localtime.localize(
datetime.strptime(args.date + ' ' + args.time, '%Y-%m-%d %H:%M:%S'))
observer = Observer()
observer.lat = args.latitude * pi / 180.0
observer.lon = args.longitude * pi / 180.0
observer.date = timestamp.astimezone(utc)
observer.elevation = args.elevation
print(
"Calculation of the location of Jupiter and Saturn for an observer at %.4f° %s, %.4f° %s, %.4f m above sea level.\n"
% (abs(args.longitude), "E" if args.longitude > 0 else "W",
abs(args.latitude), "N" if args.latitude > 0 else "S",
args.elevation))
print("Computed for local time %s." %
timestamp.astimezone(localtime).strftime('%Y-%m-%d %H:%M:%S'))
# Sun
sun = Sun(observer)
sunlight = max(0e0, cos(pi / 2 - sun.alt)) * 1e2
if sunlight > 0:
print(
"The Sun is currently above the horizon, with light at %.2f %%, at %.2f° %s."
% (sunlight, (sun.az - pi if sun.az > pi else sun.az) * 180e0 / pi,
"E" if sun.az < pi else "W" if sun.az > pi else "S"))
sunset = utc.localize(
datetime.strptime(str(
observer.next_setting(sun)), "%Y/%m/%d %H:%M:%S")).astimezone(
localtime) if observer.next_setting(sun) != None else None
if sunset != None:
print("The Sun will set at %s." % sunset.strftime("%H:%M:%S"))
else:
print("The Sun has set.")
sunrise = utc.localize(
datetime.strptime(str(
observer.next_rising(sun)), "%Y/%m/%d %H:%M:%S")).astimezone(
localtime) if observer.next_rising(sun) != None else None
print("The Sun will rise at %s." % sunrise.strftime("%H:%M:%S"))
# Moon
moon = Moon(observer)
moonlight = max(0e0, cos(pi / 2 - moon.alt)) * 1e2
if moonlight > 0:
print(
"The Moon is currently above the horizon, with light at %.2f %%." %
moonlight)
# Jupiter
jupiter = Jupiter(observer)
if jupiter.alt > 0e0:
print(
"Jupiter is %.2f° above the horizon, %.2f° %s." %
(jupiter.alt * 180e0 / pi,
(2 * pi - jupiter.az if jupiter.az > pi else jupiter.az) * 180e0 /
pi, "W" if jupiter.az > pi else "E" if jupiter.az < pi else "S"))
else:
print("Jupiter is not above the horizon.")
# Jupiter
saturn = Saturn(observer)
if saturn.alt > 0e0:
print("Saturn is %.2f° above the horizon, %.2f° %s." %
(saturn.alt * 180e0 / pi,
(2 * pi - saturn.az if saturn.az > pi else saturn.az) * 180e0 /
pi, "W" if saturn.az > pi else "E" if saturn.az < pi else "S"))
else:
print("Saturn is not above the horizon.")
# done
print("Done.")
def whats_up(
start: datetime.datetime,
end: datetime.datetime,
location: ephem.Observer,
magnitude: float = 6.) -> dict:
"""
Find all objects that will be "up" between start and end time.
Takes a location, start and end time, and limiting magnitude.
"""
body_list = []
start_e, end_e = ephem.Date(start), ephem.Date(end)
location.date = start_e
for o,body_type in filter(lambda x: x[1] != 'planetary_moon', OBJECT_DICT.values()):
o.compute(location)
circumpolar = False
rising, setting = None, None
if body_type != 'satellite':
try:
rising = location.next_rising(o, start = location.previous_antitransit(o))
setting = location.next_setting(o, start = rising)
except ephem.AlwaysUpError:
circumpolar = True
except ephem.NeverUpError:
pass
elif body_type == 'satellite':
info = list(location.next_pass(o))
rising, setting = info[0], info[4]
# the logic here is as follows:
# 1. Is object bright enough?
# 2. Is it in the sky now?
# a. Is it circumpolar (does it never set)?
# b. Does it rise during the given timeframe?
# c. Does it set during the given timeframe?
# d. Does it rise before the given timeframe and set after the given timeframe?
if o.mag < -30:
# something's wrong with the data--skip it.
continue
if o.mag < magnitude and (circumpolar or \
(rising and start_e < rising < end_e) or \
(setting and start_e < setting < end_e) or \
(rising and setting and (rising < start_e) and \
(setting > end_e))):
# If it's in the sky and bright enough, add the entry to the list
if rising or setting or circumpolar:
body_list.append({
'name': o.name.split('|') if o.name.find('|') >= 0 else o.name,
'magnitude': o.mag
})
# If it has a rise time, add that to the most recently added item
if rising:
body_list[-1]['rise_time'] = rising.datetime()
# If it has a set time, add that to the most recently added item
if setting:
body_list[-1]['set_time'] = setting.datetime()
if o.name == 'Moon':
body_list[-1]['phase'] = o.moon_phase * 100
body_list.sort(key = lambda x: x['magnitude'])
return {
'start_time': start, # start of timeframe
'end_time': end, # end of timeframe
'objects': body_list # all items visible during timeframe, as computed above
}
nargs = len(sys.argv)
el = float(sys.argv[1])
print 'Calculating galactic coordinates for elevation ' + str(el) + ' deg'
# first define the observer location
me = Observer()
me.lon = '-79.8397'
me.lat = '38.4331'
me.elevation = 800 # height in meters
# reformat the time into ephemerus format.
now = datetime.datetime.utcnow()
strnow = now.isoformat()
dates = strnow.split('T')
datestr = dates[0] + ' ' + dates[1]
me.date = datestr
timestrfull = str(dates[1])
times = timestrfull.split('.')
outname = dates[0] + '_' + times[0] + '.txt'
#print(outname)
# check the LST as a test
#print('UTC = ' + datestr + ' -> ' + str(me.sidereal_time()) + ' LST ')
#now compute the ra,dec from the azimuth,elevation, time and location
ra_a, dec_a = me.radec_of(az, str(el))
print('Horn Ra,Dec = %s,%s for Az,El %s,%s of %s' %
(ra_a, dec_a, az, str(el), datestr))
#radec_a = Equatorial( ra_a, dec_a, me.date)
radec = Equatorial(ra_a, dec_a, epoch=datestr)
print(radec.ra, radec.dec)
#finally calculate the galactic coordiates for the ra, dec coordinates
# print(data['time'])
# plt.figure(figsize=(14,10))
# #plt.scatter(data['t2'],data['mag'])
# n, bins, patches = plt.hist(data['t2'], bins=96)
# plt.xlim(-12,12)
# plt.show()
dt = '2016/5/27 00:00'
sun = Sun()
sun.compute(dt)
elginfield = Observer()
elginfield.lat = 43.19237
elginfield.lon = -81.31799
elginfield.date = dt
ra, dec = elginfield.radec_of('0', '-90')
print('RA_sun:',sun.ra)
print('Elgin nadir', ra)
print('Solar time:', hours((ra-sun.ra)%(2*pi)), 'hours')
fig, ax = plt.subplots(figsize=(14,10))
n, bins, patches = ax.hist(data['t2'], bins=192, rwidth=0.9, edgecolor='black')
ax.axvline(0, color='red')
plt.xlim(-12,12)
ax.xaxis.set_major_locator(ticker.MultipleLocator(1))
ticks = ax.get_xticks()
ticks[ticks <0] += 24
def test_moon_day_calculation_simple(self, observer: Observer, moon: Moon,
dt, number):
observer.date = dt
moon.compute(observer)
assert moon.get_day()['number'] == number, (moon.get_day()['number'],
number)
def test_optimization_day_calculation_simple(self, observer: Observer,
moon: Moon):
observer.date = datetime(2017, 4, 3, 23)
for i in range(10000):
moon.compute(observer)
assert moon.get_day()['number'] == 7, (moon.get_day()['number'], 7)