(90482) Orcus and Vanth
compiled by Wm. Robert Johnston
last updated 11 April 2010
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 was assigned April 2010.
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, 2010 by Wm. Robert Johnston.
Last modified 11 April 2010.
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