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
  1. 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
  1. 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
  1. 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