Asteroids with Satellites Database--Johnston's Archive
2001 XR254
compiled by Wm. Robert Johnston
last updated
23 June 2015
--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: |
43.21484292 AU
| |
orbital period P: |
284.0910882 yr
(= 103764.27 d)
| |
eccentricity e: |
0.028758088
| |
perihelion distance q: |
41.97206668 AU
| |
aphelion distance Q: |
44.45761915 AU
| |
inclination i: |
1.234114469°
| |
argument of perihelion ω: |
68.7945569°
| |
ascending node Ω: |
179.6929931°
| |
mean anomaly M: |
229.875487°
| |
perihelion passage TP: |
2117 Jan 29
| |
Epoch: |
2014 May 23
| |
data arc: |
2001-2009
(48 obs.)
| |
Earth MOID: |
40.9585 AU
| |
Jupiter Tisserand invariant TJ: |
5.88
|
| Neptune Tisserand invariant TN: | 3.092 [*D] |
orbital data, secondary:
|
semimajor axis as: |
9310
± 50 km
[G11a]
| |
separation/primary radius as/rp: | 110 [*D] | |
separation/Hill radius as/rH: | 0.012 [*D] | |
orbital period Ps: |
125.58
± 0.05
d [G11a]
| |
eccentricity es: |
0.556
± 0.005
[G11a]
| |
inclination is: | 41.1° ± 0.2° [G11a] | |
ascending node Ωs: | 341.2° ± 0.3° [G11a] | |
argument of pericenter ωs: | 246.3° ± 0.9° [G11a] | |
mean anomaly M: | 152° ± 0.3° [G11a] | |
Epoch: | 2007 Jul 18.5 | |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
5.7
[MPC]
6.05 ± 0.15 [V14a]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
221
± 41/71
km [V14a]
| |
geometric albedo: |
0.136
± 0.168/0.044
[V14a]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
1.08x1019
± 2x1017
kg [G14a]
| |
density ρ: |
1
± 0.96/0.56
g/cm3[V14a]
| |
Hill radius rH: |
770000 km [*D]
|
other data, primary:
|
diameter dp: |
171
± 32/55
km [V14a]
| |
color index V-I: | 1.04 ± 0.11 [B08d] | |
rotation period RPp: |
?
| |
amplitude in mag., rotational ΔM: |
?
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
140
± 26/45
km [V14a]
| |
diameter ratio ds/dp: |
0.826
± 0.024
[G09a]
| |
component mag. difference ΔM: |
0.415
± 0.064
[G09a]
| |
color index V-I: | 1.06± 0.12 [B08d] | |
rotation period RPs: |
?
| |
|
|
--
2001 XR254
--discovery and notes:
Primary discovered
2001 Dec 10
from
Mauna Kea Observatory, Hawaii, USA
by
D. C. Jewitt, S. S. Sheppard, and J. Kleyna.
Companion discovered
2006 Dec 20
using
Hubble Space Telescope
observations from Hubble Space Telescope.
Announced
2007 Mar 14.
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Grundy, W. M., Noll, K. S., Buie, M. W., Benecchi, S. D., Stephens, D. C., & Levison, H. F. 2009, Icarus Mutual orbits and masses of six transneptunian binaries
- Noll, Keith S., Grundy, William M., Chiang, Eugene I., Margot, Jean-Luc, & Kern, Susan D. 2007, ArXiv Astrophysics e-prints Binaries in the Kuiper Belt
- Sheppard, S. S. & Marsden, B. G. 2002, Minor Planet Electronic Circulars 2001 XR254
©
2007-2014, 2015
by Wm. Robert Johnston.
Last modified
23 June 2015.
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