Asteroids with Satellites Database--Johnston's Archive

(612578) 2003 QR91

compiled by Wm. Robert Johnston
last updated 10 April 2022

--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: 46.376 AU
orbital period P: 315.821 yr
(= 115353.7 d)
eccentricity e: 0.17962
perihelion distance q: 38.045 AU
aphelion distance Q: 54.706 AU
inclination i: 3.49874°
argument of perihelion ω: 12.76°
ascending node Ω: 273.3090°
mean anomaly M: 30.59°
perihelion passage TP: 1987 Jul 22
Epoch: 2014 May 23
data arc: 2003-2009 (17 obs.)
Earth MOID: 37.0284 AU
Jupiter Tisserand invariant TJ: 5.975
Neptune Tisserand invariant TN:3.09 [*D]


orbital data, secondary:
semimajor axis as: 1790 ± 60 km (separation) [N08c]
separation/primary radius as/rp:17 [*E]
separation/Hill radius as/rH:0.0028 [*E]
orbital period Ps: 7.5 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 6.5 [MPC]
6.55 ± 0.56 [V14a]
slope parameter G: (0.15) [*A]
effective diameter dE: 280 ± 27/30 km [V14a]
geometric albedo: 0.054 ± 0.035/0.028 [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: 207 ± 21 km [V14a]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 189 ± 29 km [V14a]
diameter ratio ds/dp: 0.912 ± 0.103 [N08c]
component mag. difference ΔM: 0.2 ± 0.3 [N08c]
rotation period RPs: ?

-- (612578) 2003 QR91 --discovery and notes:

Primary discovered 2003 Aug 24 from Cerro Tololo Observatory, La Serena, Chile by M. W. Buie. Permanent number assigned 28 Mar 2022.

Companion discovered - using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2007 Mar 14.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2007-2014, 2022 by Wm. Robert Johnston.
Last modified 10 April 2022.
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