Asteroids with Satellites Database--Johnston's Archive

(48639) 1995 TL8

compiled by Wm. Robert Johnston
last updated 24 May 2014
under construction--testing upgrades!

--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 (BBRB) [*B05c]
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 : ? ; ?


other data, secondary:
diameter ds: 80 km [*D]
diameter ratio ds/dp: 0.457 [G12b]
component mag. difference ΔM: 1.7 [*S05a]
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 HST 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 24 May 2014.
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