Asteroids with Satellites Database--Johnston's Archive

(505447) 2013 SQ99

compiled by Wm. Robert Johnston
last updated 17 August 2019

--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: 44.1154 AU
orbital period P: 293.02 yr
(= 107024.5 d)
eccentricity e: 0.09531
perihelion distance q: 39.9109 AU
aphelion distance Q: 48.3199 AU
inclination i: 3.47165°
argument of perihelion ω: 176.5°
ascending node Ω: 51.9396°
mean anomaly M: 142.07°
perihelion passage TP: 1903 Sep 08.4
Epoch: 2019 Apr 27
data arc: 2008-2017 (56 obs.)
Earth MOID: 38.9012 AU
Jupiter Tisserand invariant TJ: 5.904

orbital data, secondary:
semimajor axis as: 13300 ± 500 km (separation) [F17a]
separation/primary radius as/rp:140 [*E]
separation/Hill radius as/rH:0.022 [*E]
orbital period Ps: 200 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 6.4 [MPC]
6.7 ± 0.5 [G19c]
slope parameter G: (0.15) [*A]
effective diameter dE: 231 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: 610000 km [*E]

other data, primary:
diameter dp: 180 km [*E]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 146 km [*E]
diameter ratio ds/dp: 0.81 ± 0.03 [F17a]
component mag. difference ΔM: 0.46 [*D]
rotation period RPs: ?

-- (505447) 2013 SQ99 --discovery and notes:

Primary discovered 2013 Aug 05 from Mauna Kea Observatory, Hawaii, USA by Outer Solar System Origins Survey. Linked to prediscovery observations from 2008 Sep 06. Permanent number assigned 2017 Nov 04.

Companion discovered by Fraser, W. C., et al. using adaptive optics telescope observations. Announced 2017 Apr 04 [F17a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2019 by Wm. Robert Johnston.
Last modified 17 August 2019.
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