Asteroids with Satellites Database--Johnston's Archive

2003 QA91

compiled by Wm. Robert Johnston
last updated 20 September 2014

--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: 44.257 AU
orbital period P: 294.429 yr
(= 107540.1 d)
eccentricity e: 0.07039
perihelion distance q: 41.142 AU
aphelion distance Q: 47.372 AU
inclination i: 2.41587°
argument of perihelion ω: 333.25°
ascending node Ω: 104.725°
mean anomaly M: 268.48°
perihelion passage TP: 2089 Mar 29
Epoch: 2014 May 23
data arc: 2003-2009 (31 obs.)
Earth MOID: 40.1566 AU
Jupiter Tisserand invariant TJ: 5.931
Neptune Tisserand invariant TN:3.10 [*D]


orbital data, secondary:
semimajor axis as: 1900 ± 100 km (separation) [N08c]
separation/primary radius as/rp:20 [*E]
separation/Hill radius as/rH:0.0030 [*E]
orbital period Ps: 9.1 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 5.5 [MPC]
5.76 ± 0.63 [V14a]
slope parameter G: (0.15) [*A]
effective diameter dE: 260 ± 30/36 km [V14a]
geometric albedo: 0.13 ± 0.119/0.075 [V14a]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1 g/cm3) [*A]
Hill radius rH: 630000 km [*E]

other data, primary:
diameter dp: 188 ± 24 km [V14a]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 180 ± 35 km [V14a]
diameter ratio ds/dp: 0.955 ± 0.138 [N08c]
component mag. difference ΔM: 0.1 ± 0.6 [N08c]
rotation period RPs: ?

-- 2003 QA91 --discovery and notes:

Primary discovered 2003 Aug 24 from Cerro Tololo Observatory, La Serena, Chile by M. W. Buie.

Companion discovered 2006 Jun 19 using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2007 Mar 14.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2007-2008, 2014 by Wm. Robert Johnston.
Last modified 20 September 2014.
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