def Ede():
loc = Observer()
loc.horizon = "0"
loc.lat = str(52.)
loc.lon = str(5.6)
loc.elevation = 24.5
return loc
def setupobs(lla):
obs = Observer()
try:
obs.lat = str(lla[0]); obs.lon = str(lla[1]); obs.elevation=float(lla[2])
except ValueError:
warn('observation location not specified. defaults to lat=0, lon=0')
return obs
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 _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 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 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 get_dutch_lofar_object():
"""Return an ephem.Observer() object with details containing the Dutch
Lofar array"""
lofar = Observer()
lofar.lon = '6.869882'
lofar.lat = '52.915129'
lofar.elevation = 15.
return lofar
def setupobs(obslla):
assert len(obslla) == 3
obs = Observer()
obs.lat = str(obslla[0]) # STRING or wrong result! degrees
obs.lon = str(obslla[1]) # STRING or wrong result! degrees
obs.elevation = obslla[2] # meters
return obs
def __build_obs (self) :
'''Set up the Observer
Returns:
The observer built
'''
local_observer = Observer ()
local_observer.pressure = 0
local_observer.horizon = HORIZON
local_observer.lat = LATITUDE
local_observer.lon = LONGITUDE
return local_observer
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)]
def test_lon_can_also_be_called_long(self):
o = Observer()
o.lon = 3.0
self.assertEqual(o.long, 3.0)
o.long = 6.0
self.assertEqual(o.lon, 6.0)
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.")
# print int(data['time'][0])
# 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()
def get_lv_lofar_object():
"""Return an ephem.Observer() object with details containing the LV station"""
lv = Observer()
lv.lon = '21.854916'
lv.lat = '57.553493'
return lv
def get_ie_lofar_object():
"""Return an ephem.Observer() object with details containing the IE station"""
ie = Observer()
ie.lon = '-7.921790'
ie.lat = '53.094967'
return ie
def test_lon_can_also_be_called_long(self):
o = Observer()
o.lon = 3.0
self.assertEqual(o.long, 3.0)
o.long = 6.0
self.assertEqual(o.lon, 6.0)
def test_longitude_constructor_does_not_hang(self): # GitHub #207
observer = Observer()
observer.lon = '-113.78401934344532'
from ephem import Galactic
import datetime
# set the default azimuth and elevation for the first calcuation
az = '220'
el = '20'
el = '45'
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 ')