(139775) 2001 QG298
compiled by Wm. Robert Johnston
last updated 2 July 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: |
39.1964289 AU
| |
orbital period P: |
245.4019 y (=89635 d)
| |
eccentricity e: |
0.1916447
| |
perihelion distance q: |
31.684641 AU
| |
aphelion distance Q: |
46.70821676 AU
| |
inclination i: |
6.50238°
| |
argument of perihelion omega: |
211.29488°
| |
ascending node OMEGA: |
162.56987°
| |
mean anomaly M: |
350.83597°
| |
perihelion passage TP: |
2011-11-16.6640856
| |
Epoch: |
18 AUG 2005
| |
data arc: |
2001-2002 (18 obs.)
|
orbital data, secondary:
|
semimajor axis a: |
(240 km?)
| |
semimajor axis/primary radius a/Rp: |
(3?)
| |
orbital period P: |
13.7744 ± 0.0004 h? [S04a]
| |
eccentricity e: |
?
| |
other data, primary:
|
diameter: |
260 x 205 x 185 km;
164 x 130 x 116 km [T04a]
| |
absolute magnitude H: |
6.30 [JPL]
| |
rotation period: |
6.8872 ± 0.0002 h
or 13.7744 ± 0.0004 [S04a]
| |
amplitude delta M: |
1.14 ± 0.04 [S04a]
| |
color index B-V: |
1.00 ± 0.04 [S04a]
| |
color index V-R: |
0.60 ± 0.02 [S04a]
| |
color index R-I: |
?
| |
slope parameter G: |
(0.15) assumed
| |
geometric albedo: |
(0.04 or 0.10) assumed
| |
mass: |
?
| |
density: |
0.63 g/cm3 [T04a]
| |
type: |
?
|
other data, secondary:
|
diameter: |
265 x 160 x 150 km
168 x 102 x 94 km [T04a]
| |
diameter ratio Ds/Dp: |
(0.86)
| |
component magnitude difference: |
(0.3)
| |
rotation period: |
(13.7744 h)
|
|
--(139775) 2001 QC298--discovery and notes:
Primary discovered 19 August 2001 by M. W. Buie from Cerro Tololo Observatory, La Serena.
Companion suggested by S. S. Sheppard and D. Jewitt in 2004 based on lightcurve observations.
See more information and links at
Asteroid/Comet Connection Catchall Catalog page
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Takahashi, Shigeru & Ip, Wing-Huen 2004, Publications of the Astronomical Society of Japan A Shape-and-Density Model of the Putative Binary EKBO 2001 QG298
- Sheppard, S. S. & Jewitt, D. 2004, AAS/Division for Planetary Sciences Meeting Abstracts A Contact Binary in the Kuiper Belt?
- Sheppard, Scott S. & Jewitt, David 2004, Astronomical Journal Extreme Kuiper Belt Object 2001 QG298 and the Fraction of Contact Binaries
- Sheppard, S. S., Fernandez, Y. R., & Marsden, B. G. 2002, Minor Planet
Electronic Circulars 2001 QG298
© 2002-2008, 2009 by Wm. Robert Johnston.
Last modified 2 July 2009.
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