astroconst.aa module
aa.py: Define astronomical constants from the AA table Selected Astronomical Constants, 2021. Source: http://asa.hmnao.com/SecK/Constants.html
- astroconst.aa.a_e = 6378136.6
6378136.6 ± 0.1 m (TT)
- Type:
Equatorial radius for Earth
- astroconst.aa.au = 149597870700
149597870700 m
- Type:
Astronomical unit (unit distance)
- astroconst.aa.c = 299792458
299792458 m/s
- Type:
Speed of light
- astroconst.aa.depsilon_dt = -46.836769
-46.836769 ‘’/Julian century (TDB)
- Type:
Rate of change in obliquity
- astroconst.aa.dj_2 = -3e-09
-3.0E-09 ± 6E-10 per cy
- Type:
Long-term variation in J_2
- astroconst.aa.domega_dt = -0.025754
-0.025754 ‘’/Julian century (TDB)
- Type:
Precession of the equator in obliquity
- astroconst.aa.dpsi_dt = 5038.481507
5038.481507 ‘’/Julian century (TDB)
- Type:
Precession of the equator in longitude
- astroconst.aa.dtheta_dut1 = 1.0027378119113546
1.00273781191135448 revs/UT1-day
- Type:
Rate of advance of ERA
- astroconst.aa.epsilon_j2000 = 23.4392794
23.4392794 °
- Type:
Mean obliquity of the ecliptic, epsilon_0
- astroconst.aa.g = 6.67428e-11
6.67428E-11 ± 6.7E-15 m^3/kg/s^2
- Type:
Constant of gravitation
- astroconst.aa.gme = 398600441800000.0
3.986004418E14 ± 8E05 m^3/s^2 (TCB)
- Type:
Geocentric gravitational constant
- astroconst.aa.gms = 1.32712442099e+20
1.32712442099E20 ± 1E10 m^3/s^2 (TCB)
- Type:
Solar mass parameter
- astroconst.aa.gms_over_gme = 332946.0487
332946.0487 ± 7E-04 [-]
- Type:
Mass Ratio
- Type:
Sun to Earth
- astroconst.aa.j_2 = 0.0010826359
0.0010826359 ± 1E-10 [-]
- Type:
Dynamical form-factor for the Earth
- astroconst.aa.kappa = 20.49551
20.49551 ‘’
- Type:
Constant of aberration at epoch J2000.0
- astroconst.aa.l_b = 1.550519768e-08
1.550519768E-08 [-]
- Type:
1-d(TDB)/d(TCB)
- astroconst.aa.l_c = 1.48082686741e-08
1.48082686741E-08 ± 2E-17 [-]
- Type:
Average value of 1-d(TCG)/d(TCB)
- astroconst.aa.l_g = 6.969290134e-10
6.969290134E-10 [-]
- Type:
1-d(TT)/d(TCG)
- astroconst.aa.m_ceres_over_m_s = 4.72e-10
4.72E-10 ± 3E-12 [-]
- Type:
Mass Ratio
- Type:
Ceres to Sun
- astroconst.aa.m_e = 5.9722e+24
5.9722E24 ± 6E20 kg
- Type:
Mass of the Earth
- astroconst.aa.m_e_over_m_m = 81.300568
81.300568 ± 3E-06 [-]
- Type:
Mass Ratio
- Type:
Earth to Moon
- astroconst.aa.m_m_over_m_e = 0.0123000371
1.23000371E-02 ± 4E-10 [-]
- Type:
Mass Ratio
- Type:
Moon to Earth
- astroconst.aa.m_pallas_over_m_s = 1.03e-10
1.03E-10 ± 3E-12 [-]
- Type:
Mass Ratio
- Type:
Pallas to Sun
- astroconst.aa.m_s = 1.9884e+30
1.9884E30 ± 2E26 kg
- Type:
Mass of the Sun
- astroconst.aa.m_s_over_m_eris = 119100000.0
1.191E08 ± 1.4E06 [-]
- Type:
Mass Ratio
- Type:
Sun to (136199) Eris
- astroconst.aa.m_s_over_m_j = 1047.348644
1.047348644E03 ± 1.7E-05 [-]
- Type:
Mass Ratio
- Type:
Sun to Jupiter
- astroconst.aa.m_s_over_m_ma = 3098703.59
3.09870359E06 ± 2E-02 [-]
- Type:
Mass Ratio
- Type:
Sun to Mars
- astroconst.aa.m_s_over_m_me = 6023600.0
6.0236E06 ± 3E02 [-]
- Type:
Mass Ratio
- Type:
Sun to Mercury
- astroconst.aa.m_s_over_m_n = 19412.26
1.941226E04 ± 3E-02 [-]
- Type:
Mass Ratio
- Type:
Sun to Neptune
- astroconst.aa.m_s_over_m_p = 136566000.0
1.36566E08 ± 2.8E04 [-]
- Type:
Mass Ratio
- Type:
Sun to (134340) Pluto
- astroconst.aa.m_s_over_m_sa = 3497.9018
3.4979018E03 ± 1E-04 [-]
- Type:
Mass Ratio
- Type:
Sun to Saturn
- astroconst.aa.m_s_over_m_u = 22902.98
2.290298E04 ± 3E-02 [-]
- Type:
Mass Ratio
- Type:
Sun to Uranus
- astroconst.aa.m_s_over_m_ve = 408523.719
4.08523719E05 ± 8E-03 [-]
- Type:
Mass Ratio
- Type:
Sun to Venus
- astroconst.aa.m_sun_over_m_earthmoon = 328900.5596
328900.5596 ± 7E-04 [-]
- Type:
Mass Ratio
- Type:
Sun to Earth + Moon
- astroconst.aa.m_vesta_over_m_s = 1.35e-10
1.35E-10 ± 3E-12 [-]
- Type:
Mass Ratio
- Type:
Vesta to Sun
- astroconst.aa.msat_over_mpl_ariel = 1.49e-05
1.49E-05 [-]
- Type:
Mass of Ariel over planet mass
- astroconst.aa.msat_over_mpl_callisto = 5.667e-05
5.667E-05 [-]
- Type:
Mass of Callisto over planet mass
- astroconst.aa.msat_over_mpl_europa = 2.528e-05
2.528E-05 [-]
- Type:
Mass of Europa over planet mass
- astroconst.aa.msat_over_mpl_ganymede = 7.805e-05
7.805E-05 [-]
- Type:
Mass of Ganymede over planet mass
- astroconst.aa.msat_over_mpl_io = 4.705e-05
4.705E-05 [-]
- Type:
Mass of Io over planet mass
- astroconst.aa.msat_over_mpl_oberon = 3.32e-05
3.32E-05 [-]
- Type:
Mass of Oberon over planet mass
- astroconst.aa.msat_over_mpl_titan = 0.0002367
2.367E-04 [-]
- Type:
Mass of Titan over planet mass
- astroconst.aa.msat_over_mpl_titania = 3.94e-05
3.94E-05 [-]
- Type:
Mass of Titania over planet mass
- astroconst.aa.msat_over_mpl_triton = 0.0002089
2.089E-04 [-]
- Type:
Mass of Triton over planet mass
- astroconst.aa.msat_over_mpl_umbriel = 1.41e-05
1.41E-05 [-]
- Type:
Mass of Umbriel over planet mass
- astroconst.aa.n = 9.2052331
9.2052331 ‘’
- Type:
Constant of nutation at epoch J2000.0
- astroconst.aa.omega = 7.292115e-05
7.292115E-05 rad/s (TT)
- Type:
Nominal mean angular vel.of Earth rotatio
- astroconst.aa.one_over_f = 298.25642
298.25642 ± 1E-05 [-]
- Type:
Earth, reciprocal of flattening IERS 2010
- astroconst.aa.one_over_tau_a = 173.144632674
173.144632674 au/d
- astroconst.aa.p_a = 5028.796195
5028.796195 ‘’/Julian century (TDB)
- Type:
General precession in longitude
- astroconst.aa.pi_sun = 8.794143
8.794143 ‘’
- Type:
Solar parallax, pi_odot
- astroconst.aa.r_earth = 6378.1366
6378.1366 ± 0.0001 km
- Type:
Equatorial radius of Earth
- astroconst.aa.r_jupiter = 71492
71492 ± 4 km
- Type:
Equatorial radius of Jupiter
- astroconst.aa.r_mars = 3396.19
3396.19 ± 0.1 km
- Type:
Equatorial radius of Mars
- astroconst.aa.r_mercury = 2440.53
2440.53 ± 0.04 km
- Type:
Equatorial radius of Mercury
- astroconst.aa.r_moon = 1737.4
1737.4 ± 1 km
- Type:
Equatorial radius of Moon (mean)
- astroconst.aa.r_neptune = 24764
24764 ± 15 km
- Type:
Equatorial radius of Neptune
- astroconst.aa.r_pluto = 1188.3
1188.3 ± 1.6 km
- Type:
Equatorial radius of Pluto (134340)
- astroconst.aa.r_saturn = 60268
60268 ± 4 km
- Type:
Equatorial radius of Saturn
- astroconst.aa.r_sun = 696000
696000 km
- Type:
Equatorial radius of Sun
- astroconst.aa.r_uranus = 25559
25559 ± 4 km
- Type:
Equatorial radius of Uranus
- astroconst.aa.r_venus = 6051.8
6051.8 ± 1.0 km
- Type:
Equatorial radius of Venus
- astroconst.aa.tau_a = 499.00478384
499.00478384 s
- Type:
Light-time for unit distance
- astroconst.aa.tdb_0 = -6.55e-05
-6.55E-05 s
- Type:
TDB-TCB at T_0 = 2443144.5003725 (TCB)
- astroconst.aa.theta_0 = 0.779057273264
0.7790572732640 revolutions
- Type:
Earth rotation angle (ERA) at J2000.0 UT1
- astroconst.aa.w_0 = 62636853.4
6.26368534E07 ± 0.5 m^2/s^2
- Type:
Potential of the geoid