Asteroids with Satellites Database--Johnston's Archive

2015 RT245

compiled by Wm. Robert Johnston
last updated 15 December 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: 44.392 AU
orbital period P: 295.772 yr
(= 108033 d)
eccentricity e: 0.086527
perihelion distance q: 40.551 AU
aphelion distance Q: 48.2331 AU
inclination i: 0.9534°
argument of perihelion ω: 342.36°
ascending node Ω: 330.147°
mean anomaly M: 49.87°
perihelion passage TP: 1978 May 07
Epoch: 2019 Apr 27
data arc: 2013-2017 (65 obs.)
Earth MOID: 39.536 AU
Jupiter Tisserand invariant TJ: 5.936
Neptune Tisserand invariant TN:3.09799536568756 [*D]

orbital data, secondary:
semimajor axis as: 14680 ± 60 km (separation) [G19c]
separation/primary radius as/rp:180 [*E]
separation/Hill radius as/rH:0.025 [*E]
orbital period Ps: 250 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 6.5 [MPC]
7.1 ± 0.5 [G19c]
slope parameter G: (0.15) [*A]
effective diameter dE: 222 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: 580000 km [*E]

other data, primary:
diameter dp: 161 km [*E]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 153 km [*E]
diameter ratio ds/dp: 0.95 [*D]
component mag. difference ΔM: 0.1 [G19c]
rotation period RPs: ?

-- 2015 RT245 --discovery and notes:

Primary discovered 2015 Sep 08 from Mauna Kea Observatory, Hawaii, USA by Solar System Origins Legacy Survey (A. H. Parker et al.). Linked to prediscovery observations from 2013 Oct 12.

Companion discovered 2019 Sep 02 by Solar System Origins Legacy Survey (A. H. Parker et al.) using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2019 Nov 05 [G19c].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2019 by Wm. Robert Johnston.
Last modified 15 December 2019.
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