Asteroids with Satellites Database--Johnston's Archive

2002 XH91

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: 44.182 AU
orbital period P: 293.680 yr
(= 107266.4 d)
eccentricity e: 0.08389
perihelion distance q: 40.476 AU
aphelion distance Q: 47.888 AU
inclination i: 4.98507°
argument of perihelion ω: 183.96°
ascending node Ω: 80.4332°
mean anomaly M: 212.86°
perihelion passage TP: 2134 Jun 06
Epoch: 2014 May 23
data arc: 2002-2011 (21 obs.)
Earth MOID: 39.4596 AU
Jupiter Tisserand invariant TJ: 5.903
Neptune Tisserand invariant TN:3.09 [*D]


orbital data, secondary:
semimajor axis as: 19900 ± 100 km (separation) [G12b]
separation/primary radius as/rp:130 [*E]
separation/Hill radius as/rH:0.023 [*E]
orbital period Ps: 190 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 5.5 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 350 km [*E]
geometric albedo: (0.09 ) [*A]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1 g/cm3) [*A]
Hill radius rH: 860000 km [*E]

other data, primary:
diameter dp: 298 km [*E]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 185 km [*E]
diameter ratio ds/dp: 0.619 [G12b]
component mag. difference ΔM: 1.04 [N09d]
rotation period RPs: ?

-- 2002 XH91 --discovery and notes:

Primary discovered 2002 Dec 04 from Kitt Peak Observatory, Arizona, USA by M. W. Buie.

Companion discovered 2008 Nov 08 by K. S. Noll, W. M. Grundy, S. D. Benecchi, E. A. Barker, and H. A. Levison using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2009 May 27 [N09d].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2009, 2014 by Wm. Robert Johnston.
Last modified 20 September 2014.
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