1999 XY143
compiled by Wm. Robert Johnston
last updated 6 December 2009
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: |
42.9656 AU
| |
orbital period P: |
281.64 y (=102,868 d)
| |
eccentricity e: |
0.08339
| |
perihelion distance q: |
39.3827 AU
| |
aphelion distance Q: |
46.5484 AU
| |
inclination i: |
7.17166°
| |
argument of perihelion omega: |
79.708°
| |
ascending node OMEGA: |
255.44005°
| |
mean anomaly M: |
105.560°
| |
perihelion passage TP: |
1927-06-06.0
| |
Epoch: |
04 JAN 2010
| |
data arc: |
1999-2008 (26 obs.)
|
orbital data, secondary:
|
semimajor axis a: |
(~2,600 km separation)
| |
semimajor axis/primary radius a/Rp: |
(25?)
| |
orbital period P: |
(~14 d?)
| |
eccentricity e: |
?
| |
other data, primary:
|
diameter: |
(212 km?)
| |
absolute magnitude H: |
6.0059±0.5654 [JPL]
| |
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: |
(0.09) assumed
| |
mass: |
?
| |
density: |
?
| |
type: |
?
|
other data, secondary:
|
diameter: |
(178 km?)
| |
diameter ratio Ds/Dp: |
(0.84)
| |
component magnitude difference: |
0.38 [I9075]
| |
rotation period: |
?
|
|
--1999 XY143--discovery and notes:
Primary discovered by C. W. Hergenrother on 14 December 1999 from Whipple Observatory, Mt. Hopkins, Arizona.
Companion discovered by Knoll et al. from Hubble Space Telescope observations; announced 24 September 2009.
See more information and links at
Asteroid/Comet Connection Catchall Catalog page
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
© 2009 by Wm. Robert Johnston.
Last modified 6 December 2009.
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