Asteroids with Satellites Database--Johnston's Archive

1999 CM158

compiled by Wm. Robert Johnston
last updated 9 October 2021

--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, plutino

orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 39.4701 AU
orbital period P: 247.972 yr
(= 90573.5 d)
eccentricity e: 0.277456
perihelion distance q: 28.51888 AU
aphelion distance Q: 50.4214 AU
inclination i: 9.30009°
argument of perihelion ω: 164.9984°
ascending node Ω: 339.08931°
mean anomaly M: 40.6904°
perihelion passage TP: 1992 May 20.59
Epoch: 2020 May 31
data arc: 1999-2016 (51 obs.)
Earth MOID: 27.5323 AU
Jupiter Tisserand invariant TJ: 5.354
Neptune Tisserand invariant TN:2.934 [*D]

orbital data, secondary:
semimajor axis as: 450 ± 70 km (separation) [G21b]
separation/primary radius as/rp:9.8 [*E]
separation/Hill radius as/rH:0.0024 [*E]
orbital period Ps: ? d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 7.8 [MPC]
8.1 ± 0.5 [G20a]
slope parameter G: (0.15) [*A]
effective diameter dE: 106 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: 180000 km [*E]

other data, primary:
diameter dp: 92 km [*E]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 53 km [*E]
diameter ratio ds/dp: 0.58
component mag. difference ΔM: 1.2 [G20a]
rotation period RPs: ?

-- 1999 CM158 --discovery and notes:

Primary discovered 1999 Feb 11 from Mauna Kea Observatory, Hawaii, USA by C. A. Trujillo, D. C. Jewitt, and J. X. Luu.

Companion discovered 2012 May 26 by A. H. Parker, et al., and the Solar System Origins Legacy Survey using Hubble Space Telescope observations. Announced 2020 Feb 23 [G20a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2020, 2021 by Wm. Robert Johnston.
Last modified 9 October 2021.
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