def test_against_hor2eq():
"""Check that Astropy gives consistent results with an IDL hor2eq example.
See EXAMPLE input and output here:
http://idlastro.gsfc.nasa.gov/ftp/pro/astro/hor2eq.pro
"""
print('IDL hor2eq')
# Observatory position for `kpno` from here:
# http://idlastro.gsfc.nasa.gov/ftp/pro/astro/observatory.pro
location = EarthLocation(lon=Angle('-111d36.0m'),
lat=Angle('31d57.8m'),
height=2120. * u.m)
# obstime = Time('2041-12-26 05:00:00')
obstime = Time(2466879.7083333, format='jd')
# obstime += TimeDelta(-2, format='sec')
altaz_frame = AltAz(obstime=obstime, location=location)
altaz = SkyCoord('264d55m06s 37d54m41s', frame=altaz_frame)
radec_frame = 'icrs'
# The following transformation throws a warning about precision problems
# because the observation date is in the future
with catch_warnings() as _:
radec_actual = altaz.transform_to(radec_frame)
print('Astropy: ', radec_actual)
radec_expected = SkyCoord('00h13m14.1s +15d11m0.3s', frame=radec_frame)
print('Source: ', radec_expected)
distance = radec_actual.separation(radec_expected).to('arcsec')
# print(distance)
# TODO: why is there a difference of 2.6 arcsec currently?
# radec_expected = ra=3.30875 deg, dec=15.183416666666666 deg
# radec_actual = ra=3.3094193224314625 deg, dec=15.183757021354532 deg
# distance = 2.6285 arcsec
# assert distance < 5 * u.arcsec
# SAPPHiRE
longitude = -111.6
latitude = 31.9633
jd = 2466879.7083333
elevation = (37, 54, 41)
azi = (264, 55, 6)
# lst = clock.gmst_to_lst(clock.juliandate_to_gmst(jd), longitude)
# Matches LAST = +03 53 53.6 in the hor2eq.pro
gps = clock.utc_to_gps(
calendar.timegm(clock.juliandate_to_utc(jd).utctimetuple()))
zenith, azimuth = celestial.horizontal_to_zenithazimuth(
np.radians(base.sexagesimal_to_decimal(*elevation)),
np.radians(base.sexagesimal_to_decimal(*azi)))
ra, dec = celestial.zenithazimuth_to_equatorial(longitude, latitude, gps,
zenith, azimuth)
print('SAPPHiRE: ra=%f, dec=%f' % (np.degrees(ra), np.degrees(dec)))
def test_against_hor2eq(self):
"""Check for consistent results with an IDL hor2eq example.
See EXAMPLE input and output here:
http://idlastro.gsfc.nasa.gov/ftp/pro/astro/hor2eq.pro
Observatory position for ``kpno`` from here:
http://idlastro.gsfc.nasa.gov/ftp/pro/astro/observatory.pro
"""
# IDL hor2eq
ra_expected = np.radians(3.30875)
dec_expected = np.radians(15.183416666666666)
# Astropy 1.0rc1
ra_astropy = np.radians(3.3094193224314625)
dec_astropy = np.radians(15.183757021354532)
# KPNO observatory
longitude = -111.6
latitude = 31.9633
# Observation time
jd = 2466879.7083333
# Altitude Azimuth
altitude = (37, 54, 41)
azi = (264, 55, 6)
# lst = clock.gmst_to_lst(clock.juliandate_to_gmst(jd), longitude)
# Matches LAST = +03 53 53.6 in the hor2eq.pro
# SAPPHiRE
utc = calendar.timegm(clock.juliandate_to_utc(jd).utctimetuple())
gps = clock.utc_to_gps(utc)
zenith, azimuth = celestial.horizontal_to_zenithazimuth(
np.radians(base.sexagesimal_to_decimal(*altitude)),
np.radians(base.sexagesimal_to_decimal(*azi)))
ra, dec = celestial.zenithazimuth_to_equatorial(latitude, longitude,
gps, zenith, azimuth)
# Test eq_to_zenaz merely against IDL
zencalc, azcalc = celestial.equatorial_to_zenithazimuth(
latitude, longitude, gps, ra_expected, dec_expected)
self.assertAlmostEqual(ra, ra_expected, 1)
self.assertAlmostEqual(ra, ra_astropy, 1)
self.assertAlmostEqual(dec, dec_expected, 2)
self.assertAlmostEqual(dec, dec_astropy, 2)
self.assertAlmostEqual(zencalc, zenith, 1)
self.assertAlmostEqual(azcalc, azimuth, 2)
def test_against_hor2eq(self):
"""Check for consistent results with an IDL hor2eq example.
See EXAMPLE input and output here:
http://idlastro.gsfc.nasa.gov/ftp/pro/astro/hor2eq.pro
Observatory position for ``kpno`` from here:
http://idlastro.gsfc.nasa.gov/ftp/pro/astro/observatory.pro
"""
# IDL hor2eq
ra_expected = np.radians(3.30875)
dec_expected = np.radians(15.183416666666666)
# Astropy 1.0rc1
ra_astropy = np.radians(3.3094193224314625)
dec_astropy = np.radians(15.183757021354532)
# KPNO observatory
longitude = -111.6
latitude = 31.9633
# Observation time
jd = 2466879.7083333
# Altitude Azimuth
altitude = (37, 54, 41)
azi = (264, 55, 6)
# lst = clock.gmst_to_lst(clock.juliandate_to_gmst(jd), longitude)
# Matches LAST = +03 53 53.6 in the hor2eq.pro
# SAPPHiRE
utc = calendar.timegm(clock.juliandate_to_utc(jd).utctimetuple())
gps = clock.utc_to_gps(utc)
zenith, azimuth = celestial.horizontal_to_zenithazimuth(
np.radians(base.sexagesimal_to_decimal(*altitude)),
np.radians(base.sexagesimal_to_decimal(*azi)))
ra, dec = celestial.zenithazimuth_to_equatorial(
latitude, longitude, gps, zenith, azimuth)
# Test eq_to_zenaz merely against IDL
zencalc, azcalc = celestial.equatorial_to_zenithazimuth(
latitude, longitude, gps, ra_expected, dec_expected)
self.assertAlmostEqual(ra, ra_expected, 1)
self.assertAlmostEqual(ra, ra_astropy, 1)
self.assertAlmostEqual(dec, dec_expected, 2)
self.assertAlmostEqual(dec, dec_astropy, 2)
self.assertAlmostEqual(zencalc, zenith, 1)
self.assertAlmostEqual(azcalc, azimuth, 2)
def test_juliandate_to_utc_gap(self):
self.assertEqual(clock.juliandate_to_utc(2299159.5),
datetime.datetime(1582, 10, 4))
self.assertEqual(clock.juliandate_to_utc(2299160.5),
datetime.datetime(1582, 10, 15))
def test_juliandate_to_utc(self):
self.assertEqual(clock.juliandate_to_utc(2400000.5),
datetime.datetime(1858, 11, 17))
self.assertEqual(clock.juliandate_to_utc(2455581.40429),
datetime.datetime(2011, 1, 19, 21, 42, 10, 655997))
def test_juliandate_to_utc_gap(self):
self.assertEqual(clock.juliandate_to_utc(2299159.5),
datetime.datetime(1582, 10, 4))
self.assertEqual(clock.juliandate_to_utc(2299160.5),
datetime.datetime(1582, 10, 15))
def test_juliandate_to_utc(self):
self.assertEqual(clock.juliandate_to_utc(2400000.5),
datetime.datetime(1858, 11, 17))
self.assertEqual(clock.juliandate_to_utc(2455581.40429),
datetime.datetime(2011, 1, 19, 21, 42, 10, 655997))