def test_dir_from_equa(self):
random.seed(0)
t1 = dataclasses.I3Time()
t1.set_utc_cal_date(2000, 1, 1, 0, 0, 0, 0.0)
mjd1 = t1.mod_julian_day_double
t1.set_utc_cal_date(2030, 1, 1, 0, 0, 0, 0.0)
mjd2 = t1.mod_julian_day_double
for n in range(1000):
t1.set_mod_julian_time_double(random.uniform(mjd1, mjd2))
eq = astro.I3Equatorial(random.uniform(0, 2 * math.pi),
random.uniform(-math.pi / 2, math.pi / 2))
d = astro.I3GetDirectionFromEquatorial(eq, t1)
eqprime = astro.I3GetEquatorialFromDirection(d, t1)
self.assert_almost_equal(eq.ra * math.cos(eq.dec),
eqprime.ra * math.cos(eqprime.dec), 4e-6)
self.assert_almost_equal(eq.dec, eqprime.dec, 4e-6)
self.assert_less(
astro.angular_distance(eq.ra, eq.dec, eqprime.ra, eqprime.dec),
5e-6)
def Process(self):
try:
c = next(self.lines)
except StopIteration:
self.RequestSuspension()
return
eq = astro.I3Equatorial(c[0] * I3Units.degree, c[1] * I3Units.degree)
time = dataclasses.I3Time(2015, 0)
direction = astro.I3GetDirectionFromEquatorial(eq, time)
eqq = astro.I3GetEquatorialFromDirection(direction, time)
particle = dataclasses.I3Particle()
particle.dir = direction
header = dataclasses.I3EventHeader()
header.start_time = time
frame = icetray.I3Frame("P")
if self.evthdr:
frame["I3EventHeader"] = header
frame["Particle"] = particle
self.PushFrame(frame)
def test_equa_to_sg(self):
for line in self.tevcat:
ra, dec = line[1]
sgl, sgb = line[2]
eq = astro.I3Equatorial(ra * I3Units.degree, dec * I3Units.degree)
sg = astro.I3GetSuperGalacticFromEquatorial(eq)
self.assertAlmostEqual(sg.l / I3Units.degree, sgl, 2)
self.assertAlmostEqual(sg.b / I3Units.degree, sgb, 2)
def test_nan(self):
eq = astro.I3Equatorial()
assert (np.isnan(eq.ra))
assert (np.isnan(eq.dec))
gal = astro.I3Galactic()
assert (np.isnan(gal.l))
assert (np.isnan(gal.b))
def test_equa_to_gal(self):
for line in self.tevcat:
ra, dec = line[1]
l, b = line[3]
eq = astro.I3Equatorial(ra * I3Units.degree, dec * I3Units.degree)
gal = astro.I3GetGalacticFromEquatorial(eq)
self.assertAlmostEqual(gal.l / I3Units.degree, l, 3)
self.assertAlmostEqual(gal.b / I3Units.degree, b, 3)
def test_sg_from_equa(self):
random.seed(0)
for n in range(10000):
eq = astro.I3Equatorial(random.uniform(0,2* math.pi),
random.uniform(-math.pi/2,math.pi/2),
)
sg = astro.I3GetSuperGalacticFromEquatorial(eq)
eqprime = astro.I3GetEquatorialFromSuperGalactic(sg)
self.assert_almost_equal(math.cos(eq.dec)*eq.ra ,math.cos(eqprime.dec)*eqprime.ra,1e-9)
self.assert_almost_equal(eq.dec,eqprime.dec,1e-10)
self.assert_less(astro.angular_distance(eq.ra,eq.dec,eqprime.ra,eqprime.dec),1e-10)
def test_radec(self):
src_dec = 22.01450
for src_ra in np.linspace(0, 360, 1):
i3src = astro.I3Equatorial(src_ra * I3Units.degree,
src_dec * I3Units.degree)
i3t0 = dataclasses.I3Time()
i3t0.set_utc_cal_date(2000, 1, 1, 0, 0, 0, 0)
for day in np.linspace(0, 10000, 100):
i3time = i3t0 + day * 86400 * I3Units.s
i3dir = astro.I3GetDirectionFromEquatorial(i3src, i3time)
i3az = i3dir.azimuth / I3Units.degree
i3zen = i3dir.zenith / I3Units.degree
#this equation from inspecting the output of ephempy
paz = (189.9640733918 - src_ra + day * 360.985606808) % 360
pzen = 90 + src_dec
assert (azimuth_distance(i3az, paz) < 0.2)
assert (abs(i3zen - pzen) < 0.2)
print
#calculate the position of the sun
sun_direction = astro.I3GetSunDirection(time)
print(
"At {} the Sun will be at zenith={:8.4f} deg, azimuth={:7.4f} deg".format(
str(time),
sun_direction.zenith / I3Units.degree,
sun_direction.azimuth / I3Units.degree,
))
print
#This is where the crab lives on the sky
crab_position = astro.I3Equatorial(83.63308 * I3Units.degree,
22.01450 * I3Units.degree)
print(
"The Crab Nebula is located at RA = {:8.4f} deg, Dec ={:+7.4f} deg (J2000)"
.format(
crab_position.ra / I3Units.degree,
crab_position.dec / I3Units.degree,
))
#calculate the location of the crab in galactic coordinates
crab_galactic = astro.I3GetGalacticFromEquatorial(crab_position)
print(
"Which Means its galactic coordinates are l={:+8.4f} deg, b={:+7.4f} deg".
format(
crab_galactic.l / I3Units.degree,
crab_galactic.b / I3Units.degree,
))
def test_reference_points(self):
#Test the reference points that define the galactic coordinate system
#take from Wikipedia, the orignal paper was in B1950
#celestial north pole
eq = astro.I3Equatorial((12+51.4/60.)*15*I3Units.degree,
27.13 * I3Units.degree)
gal = astro.I3GetGalacticFromEquatorial(eq)
self.assertAlmostEqual(gal.b/I3Units.degree,+90,1)
#south pole
eq.ra = (+51.4/60.)*15*I3Units.degree
eq.dec = -27.13 * I3Units.degree
gal = astro.I3GetGalacticFromEquatorial(eq)
self.assertAlmostEqual(gal.b/I3Units.degree,-90,1)
#galactic center
eq.ra = (17+45.6/60.)*15*I3Units.degree
eq.dec = -28.94 * I3Units.degree
gal = astro.I3GetGalacticFromEquatorial(eq)
self.assertAlmostEqual(gal.b/I3Units.degree,0,1)
self.assertAlmostEqual(gal.l/I3Units.degree,360,1)
#anti-center
eq.ra = (5+45.6/60.)*15*I3Units.degree
eq.dec = +28.94 * I3Units.degree
gal = astro.I3GetGalacticFromEquatorial(eq)
self.assertAlmostEqual(gal.b/I3Units.degree,0,1)
self.assertAlmostEqual(gal.l/I3Units.degree,180,1)
#now test the reverse transform
#galactic north pole
gal = astro.I3Galactic( 0 * I3Units.degree,
+90 * I3Units.degree)
eq = astro.I3GetEquatorialFromGalactic(gal)
self.assertAlmostEqual(eq.ra/I3Units.degree,
(12+51.4/60.)*15.,1)
self.assertAlmostEqual(eq.dec/I3Units.degree,
27.13,1)
#south pole
gal.l = 0 * I3Units.degree
gal.b = -90 * I3Units.degree
eq = astro.I3GetEquatorialFromGalactic(gal)
self.assertAlmostEqual(eq.ra/I3Units.degree,
(0+51.4/60.)*15.,1)
self.assertAlmostEqual(eq.dec/I3Units.degree,
-27.13,1)
#galactic center
gal.l = 0 * I3Units.degree
gal.b = 0 * I3Units.degree
eq = astro.I3GetEquatorialFromGalactic(gal)
self.assertAlmostEqual(eq.ra/I3Units.degree,
(17+45.6/60.)*15.,1)
self.assertAlmostEqual(eq.dec/I3Units.degree,
-28.94,1)
#anti center
gal.l = 0 * I3Units.degree
gal.b = 180 * I3Units.degree
eq = astro.I3GetEquatorialFromGalactic(gal)
self.assertAlmostEqual(eq.ra/I3Units.degree,
(5+45.6/60.)*15.,1)
self.assertAlmostEqual(eq.dec/I3Units.degree,
+28.94,1)
#supergalactic north pole
sg = astro.I3SuperGalactic()
sg.b = 90 *I3Units.degree
sg.l = 0 *I3Units.degree
gal = astro.I3GetGalacticFromSuperGalactic(sg)
self.assertAlmostEqual(gal.l/I3Units.degree,
47.37,6)
self.assertAlmostEqual(gal.b/I3Units.degree,
6.32,6)
eq = astro.I3GetEquatorialFromSuperGalactic(sg)
print(eq.ra/I3Units.degree/15,eq.dec/I3Units.degree)
self.assertAlmostEqual(eq.ra/I3Units.degree,
18.92*15,1)
self.assertAlmostEqual(eq.dec/I3Units.degree,
15.7,1)
#supergalactic origin
sg = astro.I3SuperGalactic()
sg.b = 0 *I3Units.degree
sg.l = 0 *I3Units.degree
gal = astro.I3GetGalacticFromSuperGalactic(sg)
self.assertAlmostEqual(gal.l/I3Units.degree,
137.37,6)
self.assertAlmostEqual(gal.b/I3Units.degree,
0,6)
eq = astro.I3GetEquatorialFromSuperGalactic(sg)
self.assertAlmostEqual(eq.ra/I3Units.degree,
2.82*15,1)
self.assertAlmostEqual(eq.dec/I3Units.degree,
59.5,1)
