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:
- Sheppard, Scott S. 2010, The Astronomical Journal The Colors of Extreme Outer Solar System Objects
- Gladman, B., Holman, M., Grav, T., Kavelaars, J., Nicholson, P., Aksnes, K., & Petit, J.-M. 2002, Icarus Evidence for an Extended Scattered Disk
- Gehrels, T., Scotti, J. V., Montani, J. L., Gleason, A. E., & Marsden, B. G. 2000, Minor Planet Electronic Circulars 1995 TL8
©
2005, 2014
by Wm. Robert Johnston.
Last modified
21 September 2014.
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