(90482) Orcus
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: |
39.301 AU
| |
orbital period P: |
246.38 y (=89,991.0 d)
| |
eccentricity e: |
0.22248
| |
perihelion distance q: |
30.557 AU
| |
aphelion distance Q: |
48.044 AU
| |
inclination i: |
20.59398°
| |
argument of perihelion omega: |
72.41°
| |
ascending node OMEGA: |
268.7244°
| |
mean anomaly M: |
162.48°
| |
perihelion passage TP: |
1896-01-26.7
| |
Epoch: |
10 APR 2007
| |
data arc: |
1951-2004 (112 obs.)
|
orbital data, secondary:
|
semimajor axis a: |
8,980 ± 23 km [B09a]
| |
semimajor axis/primary radius a/Rp: |
(19?)
| |
orbital period P: |
9.5393±0.0001 d [B09a]
| |
eccentricity e: |
0.002; <0.0036 [B09a]
| |
inclination i: |
90.2° ± 0.6° [B09a]
| |
ascending node OMEGA: |
50.0° ± 0.6° [B09a]
| |
mean anomaly M: |
143.1° ± 0.02° [B09a]
| |
epoch: |
JD 2454439.280 [B09a]
| |
other data, primary:
|
diameter: |
946 +74/-72 km [S07a] (combined)
940±70 km [B09a] (combined)
820-900 km [B09a]
| |
absolute magnitude H: |
2.27±0.03 [D05b]
| |
rotation period: |
(13.18841±0.00111 h) [R07a]
| |
amplitude delta M: |
0.04 ± 0.02 [O05a]
0.18 ± 0.08 [R07a]
| |
color index B-V: |
0.68±0.04 [D05b]
| |
color index V-R: |
0.37±0.04 [D05b]
| |
color index V-I: |
0.74±0.04 [D05b]
| |
color index V-J: |
1.08±0.04 [D05b]
| |
color index V-H: |
1.21±0.05 [D05b]
| |
slope parameter G: |
(0.15) assumed
| |
geometric albedo: |
0.197 +0.034/-0.028 [S07a];
0.28±0.04 [B09a]
| |
mass: |
(6.32±0.01)x1020 kg [B09a]
| |
density: |
1.45±0.3 g cm-3 [B09a];
1.5-1.6 g cm-3 [B09a]
| |
type: |
?
|
other data, secondary:
|
diameter: |
(262 ± 170 km);
280-640 km [B09a]
| |
diameter ratio Ds/Dp: |
(0.29 ± 0.17)
| |
absolute magnitude H: |
4.88±0.05 [B09a]
| |
component magnitude difference: |
2.54±0.01 (F606W) [B09a];
(2.61±0.07) (V) [B09a]
| |
rotation period: |
?
|
|
--(90482) Orcus--discovery and notes:
Primary discovered 17 February 2004 by M. Brown, C. Trujillo, and D. Rabinowitz from Palomar Observatory, California, USA. Linked to prediscovery observations from 8 November 1951. Alternate designation 2004 DW.
Companion discovered by M. E. Brown and T.-A. Suer using Hubble Space Telescope observations from 13 November 2005; reported 22 February 2007. The name Vanth has been proposed.
See more information and links at Asteroid/Comet Connection Catchall Catalog page
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Ortiz, J. L., Gutiérrez, P. J., Santos-Sanz, P., Casanova, V., & Sota, A. 2006, Astronomy and Astrophysics Short-term rotational variability of eight KBOs from Sierra Nevada Observatory
- Trujillo, C. A., Barkume, K. M., Brown, M., Schaller, E. L., & Rabinowitz, D. L. 2005, Bulletin of the American Astronomical Society Near Infrared Spectra from Mauna Kea of the New Brightest Kuiper Belt Object
- Trujillo, Chadwick A., Brown, Michael E., Rabinowitz, David L., & Geballe, Thomas R. 2005, Astrophysical Journal Near-Infrared Surface Properties of the Two Intrinsically Brightest Minor Planets: (90377) Sedna and (90482) Orcus
- de Bergh, C., Delsanti, A., Tozzi, G. P., Dotto, E., Doressoundiram, A., & Barucci, M. A. 2005, Astronomy and Astrophysics The surface of the transneptunian object 90482 Orcus
- Tegler, S. C., Romanishin, W., Consolmagno, G. J., Rall, J., Worhatch, R., Nelson, M., & Weidenschilling, S. 2005, Icarus The period of rotation, shape, density, and homogeneous surface color of the Centaur 5145 Pholus
© 2007, 2009 by Wm. Robert Johnston.
Last modified 6 December 2009.
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