Asteroids with Satellites Database--Johnston's Archive

(48639) 1995 TL8

compiled by Wm. Robert Johnston
last updated 21 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

orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 52.560 AU
orbital period P: 381.054 yr
(= 139180.1 d)
eccentricity e: 0.23597
perihelion distance q: 40.1573 AU
aphelion distance Q: 64.962 AU
inclination i: 0.24245°
argument of perihelion ω: 84.426°
ascending node Ω: 261.059°
mean anomaly M: 40.346°
perihelion passage TP: 1971 Sep 07
Epoch: 2014 May 23
data arc: 1995-2008 (48 obs.)
Earth MOID: 39.1489 AU
Jupiter Tisserand invariant TJ: 6.276
Neptune Tisserand invariant TN:3.14 [*D]

orbital data, secondary:
semimajor axis as: 420 ± 300 km (separation) [S06c]
separation/primary radius as/rp:4.8 [*E]
separation/Hill radius as/rH:0.0009 [*E]
orbital period Ps: 1.4 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 5.4 [MPC]
5.28 [JPL]
slope parameter G: (0.15) [*A]
effective diameter dE: 194 km [M13a]
geometric albedo: 0.369 ± 0.237/0.142 [M13a]
color index U-B: ?
color index B-V: 1.04 [B05b]
color index V-R:0.69 ± 0.01 [B05b]
color index B-R:1.73 [B05b]
color index V-I:1.33 ± 0.01 [B05b]
color index R-J:1.73 [*D]
color index V-J:2.42 ± 0.05 [B05b]
color index J-H:0.4 [*D]
color index V-H:2.82 ± 0.07 [B05b]
taxonomic type: RR (G-mode) [B05b]
mass m: ?
density ρ: (1 g/cm3) [*A]
Hill radius rH: 480000 km [*E]

other data, primary:
diameter dp: 176 km [*D]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 80 km [*D]
diameter ratio ds/dp: 0.457 [G12b]
component mag. difference ΔM: 1.7 [S06c]
rotation period RPs: ?

-- (48639) 1995 TL8 --discovery and notes:

Primary discovered 1995 Oct 15 from Kitt Peak Observatory, Arizona, USA by A. Gleason. Linked to prediscovery observations from 1995 Sep 24. Permanent number assigned 2002 Nov 20.

Companion discovered 2002 Nov 09 using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2005 Oct 06.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2005, 2014 by Wm. Robert Johnston.
Last modified 21 September 2014.
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