Asteroids with Satellites Database--Johnston's Archive

(50000) Quaoar and Weywot

compiled by Wm. Robert Johnston
last updated 24 May 2014
under construction--testing upgrades!

--Orbital and physical data--

(See this page for definitions of quantities; source codes in brackets, see this link for full references; *A, *D, and *E indicate assumed, derived, and estimated values, respectively.)

dynamical type, primary: TNO, Cubewano


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 43.2191 AU
orbital period P: 284.133 yr (= 103779.5 d)
eccentricity e: 0.035127
perihelion distance q: 41.7009 AU
aphelion distance Q: 44.7372 AU
inclination i: 7.990086°
argument of perihelion ω: 161.258°
ascending node Ω: 188.87394°
mean anomaly M: 279.484°
perihelion passage TP: 2077 Dec 09
Epoch: 2014 May 23
data arc: 1954-2012 (399 obs.)
Earth MOID: 40.6949 AU
Jupiter Tisserand invariant TJ: 5.825
Neptune Tisserand invariant TN:3.07 [*D]


orbital data, secondary:
semimajor axis as: 13800 ± 1000 km [F13d]
separation/primary radius as/rp:26 [*D]
separation/Hill radius as/rH:0.0036 [*D]
orbital period Ps: 12.26 ± 0.58 d [F13d]
eccentricity es: 0.148 ± 0.025/D [F13d]
inclination is:14°± 4 [*F10c]
ascending node Ωs:1°± 5 [*F11a]
argument of pericenter ωs:348°± 8 [*F11a]
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 2.4 [MPC]
2.73 ± 0.06 [F13a]
slope parameter G: 0.15 [*A]
effective diameter dE: 1073.6 ± 37.9/37.9 km [F13a]
geometric albedo: 0.127 ± 0.01/0.009 [F13a]
color index U-B: ?
color index B-V: 0.94 [T03b]
color index V-R:0.64± 0.01 [T03b]
color index B-R:1.58± 0.01 [T03b]
color index V-I:1.28± 0.02 [F04a]
color index R-J:1.54 [*D]
color index V-J:2.18± 0.06 [D09c]
color index J-H:0.36 [D09c]
color index V-H:2.54± 0.06 [D09c]
taxonomic type: ?
mass m: 1.4x1021 #VALUE! kg [F13d]
density ρ: 2.18 ± 0.43/0.36 g/cm3 [F13a]
Hill radius rH: 3800000 km [*D]

other data, primary:
diameter dp: 1070 ± 38/38 km [F13a]
rotation period RPp: 8.839 ± 0.003 h [F13a]
amplitude in mag., rotational ΔM: 0.18 ± 0.10 [*R07a]
pole direction : ? ; ?


other data, secondary:
diameter ds: 81 ± 11/11 km [F13a]
diameter ratio ds/dp: 0.076 ± 0.007 [N08c]
component mag. difference ΔM: 5.6 ± 0.2 [I8812]
rotation period RPs: ?

-- (50000) Quaoar and Weywot --discovery and notes:

Primary discovered 2002 Jun 04 from Palomar Observatory, California, USA by C. A. Trujillo and M. E. Brown. Alternate designation(s): 2002 LM60 . Linked to prediscovery observations from 1954 May 25. Permanent number assigned 2002 Nov 20.

Named 2002 Nov 20 for the mythological Tongva god [MPC47170].

Companion discovered 2006 Feb 14 by M. E. Brown and T.-A. Suer using HST observations from Hubble Space Telescope. Announced 2007 Feb 22 [B07d]. Permanent designation I Weywot, assigned 2009 Oct 04; named for the mythological Tongva god of the sky [*].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2007-2012, 2014 by Wm. Robert Johnston.
Last modified 24 May 2014.
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