2001 XR254
compiled by Wm. Robert Johnston
last updated 28 December 2008
Orbital elements and other data (Assumed or derived values in parenthesis, my estimates in italics and parenthesis. Source identifications in brackets, see this link for sources):
orbital data, primary (osculating elements) [JPL]:
|
semimajor axis a: |
42.8871482 AU
| |
orbital period P: |
280.87 y (=102,586.3 d)
| |
eccentricity e: |
0.0336372
| |
perihelion distance q: |
41.4445446 AU
| |
aphelion distance Q: |
44.3297518 AU
| |
inclination i: |
1.23245°
| |
argument of perihelion omega: |
81.73116°
| |
ascending node OMEGA: |
179.97541°
| |
mean anomaly M: |
207.26203°
| |
perihelion passage TP: |
2126-06-09.5
| |
Epoch: |
10 APR 2007
| |
data arc: |
2001-2007 (18 obs.)
|
orbital data, secondary:
|
semimajor axis a: |
9,271 ± 130 km [G09a]
| |
semimajor axis/primary radius a/Rp: |
(110)
| |
orbital period P: |
125.61 ± 0.13 d [G09a]
| |
eccentricity e: |
0.5516 ± 0.0091 [G09a]
| |
inclination i: |
41.07° ± 0.22° [G09a]
154.50° ± 0.22° [G09a]
| |
other data, primary:
|
diameter: |
(169 km ± 39 km) [G09a]
| |
absolute magnitude H: |
6.030 ± 0.017 [G09a]
| |
rotation period: |
?
| |
amplitude delta M: |
?
| |
color index B-V: |
?
| |
color index V-R: |
?
| |
color index R-I: |
?
| |
slope parameter G: |
(0.15) assumed
| |
geometric albedo: |
0.15 ± 0.06 [G09a]
| |
mass: |
(4.00 ± 0.17) x1018 kg [G09a]
| |
density: |
?
| |
type: |
?
|
other data, secondary:
|
diameter: |
(140 km ± 36 km)
| |
diameter ratio Ds/Dp: |
(0.83 ± 0.02)
| |
component magnitude difference: |
0.415 ± 0.064 [G09a]
| |
rotation period: |
?
|
|
--2001 XR254--discovery and notes:
Primary discovered 10 December 2001 by D. C. Jewitt, S. S. Sheppard, and J. Kleya from Mauna Kea Observatory, Hawaii, United States.
Companion reported March 2007.
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- 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, 2008 by Wm. Robert Johnston.
Last modified 28 December 2008.
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