(162000) 1990 OS
compiled by Wm. Robert Johnston
last updated 1 October 2007
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: |
1.67848976608006 AU
| |
orbital period P: |
2.1746 y (=794.3 d)
| |
eccentricity e: |
0.462588502950929
| |
perihelion distance q: |
0.902039697970632 AU
| |
aphelion distance Q: |
2.45493983 AU
| |
inclination i: |
1.09726904748493°
| |
argument of perihelion omega: |
21.2864235362148°
| |
ascending node OMEGA: |
346.748264219497°
| |
mean anomaly M: |
216.052014480115°
| |
perihelion passage TP: |
2005-12-13.5993201
| |
Epoch: |
30 JAN 2005
| |
data arc: |
1990-2005 (344 obs.)
|
orbital data, secondary:
|
semimajor axis a: |
>600 m [I8237]
| |
semimajor axis/primary radius a/Rp: |
(>4?)
| |
orbital period P: |
21 ± 3 h [I8237]
| |
eccentricity e: |
?
| |
other data, primary:
|
diameter: |
300 m [I8237]
| |
absolute magnitude H: |
19.3 [JPL]
| |
rotation period: |
?
| |
amplitude delta M: |
?
| |
color index B-V: |
?
| |
color index V-R: |
?
| |
color index R-I: |
?
| |
slope parameter G: |
(0.15) [a]
| |
geometric albedo: |
?
| |
mass: |
?
| |
density: |
?
| |
type: |
?
|
other data, secondary:
|
diameter: |
45 m [I8237]
| |
diameter ratio Ds/Dp: |
(0.15)
| |
component magnitude difference: |
?
| |
rotation period: |
?
|
|
--(162000) 1990 OS--discovery and notes:
Primary discovered 21 July 1990 by E. F. Helin from Palomar Mountain Observatory, California, USA.
Companion discovered 5-6 November 2003 by S. J. Ostro, M. C. Nolan, L. A. M. Benner, J. D. Giorgini, J. L. Margot, and C. Magri using the Arecibo radio telescope, Puerto Rico.
See more information and links at
Asteroid/Comet Connection Catchall Catalog page
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Ostro, S. J., Nolan, M. C., Benner, L. A. M., Giorgini, J. D., Margot, J. L., & Magri, C. 2003, International Astronomical Union Circular 1990 OS
- McNaught, R. H. & Williams, G. V. 2003, Minor Planet Circulars 1990 OS
- Green, D. W. E. 1990, International Astronomical Union Circular 1990 OS
- Balam, D. D., Tatum, J. B., Gilmore, A. C., & Kilmartin, P. M. 1990, International Astronomical Union Circular 1990 OS
- Helin, E., Roman, B., Lawrence, K., Michaud, J., Holt, H. E., & Levy, D. H. 1990, International Astronomical Union Circular 1990 OS
© 2003-2005, 2007 by Wm. Robert Johnston.
Last modified 1 October 2007.
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