90482 Orcus
 | |
| Discovery | |
|---|---|
| Discovered by | M. Brown, C. Trujillo, D. Rabinowitz |
| Discovery date | February 17, 2004 |
| Designations | |
| 2004 DW | |
| Plutino[1] | |
| Orbital characteristics | |
| Epoch November 30, 2008 (JD 2 454 800) | |
| Aphelion | 7 188.17 Gm (48.05 AU) |
| Perihelion | 4 535.80 Gm (30.32 AU) |
| 5 862.44 Gm (39.188 AU) | |
| Eccentricity | 0.226 18 |
| 89 606 d (245.33 yr) | |
Average orbital speed | 4.68 km/s |
| 164.68° | |
| Inclination | 20.593° |
| 268.722° | |
| 72.474° | |
| Known satellites | 1 (92-432 km) |
| Physical characteristics | |
| Dimensions | 946.3 +74.1 −72.3 km (diameter)[2] |
| Mass | ~7.5×1020 kg |
Mean density | ~1.5 g/cm³ (assumed) |
| ~0.2 m/s² | |
| ~0.44 km/s | |
| 13.19h[3] | |
| Albedo | 19.75 +3.40 −2.76 % |
| Temperature | ~45 K |
Spectral type | B-V=0.68; V-R=0.37 [4] |
| 19.1 (opposition)[5] | |
| 2.3[6] | |
90482 Orcus, originally known by the provisional designation 2004 DW) is a Kuiper belt object (KBO) and could be a dwarf planet. It was found by Michael Brown, Chad Trujillo and David Rabinowitz on February 17, 2004. It was also seen in pictures from November 8, 1951.
Moon
A moon of Orcus was found on 22 February 2007.[7] The orbit of this moon has yet to be found out.
The satellite was found at 0.25 arcsec from Orcus with magnitude difference of 2.7.[8] Assuming an albedo similar to that of the primary, the magnitude suggests a diameter of about 220 km. It is thought to be a smaller KBO that was captured.
Other websites
- MPEC 2004-D09 announcing the discovery but attributing it to Raymond J. Bambery, Steven H. Pravdo, Michael D. Hicks, Kenneth J. Lawrence, Daniel MacDonald, Eleanor F. Helin and Robert Thicksten / NEAT
- MPEC 2004-D13 correcting MPEC 2004-D09
- Chad Trujillo's page on 2004 DW
- First BBC article
- First New Scientist article
- Updated orbital elements from Lowell Observatory
- AstDys orbital elements
- Orbital simulation from JPL (Java) / Ephemeris
References
- ↑ Buie, Marc W. (2007-12-22). "Orbit Fit and Astrometric record for 90482". SwRI (Space Science Department). Archived from the original on 2012-02-08. Retrieved 2008-09-19.
{{cite web}}: Unknown parameter|deadurl=ignored (|url-status=suggested) (help) - ↑ Stansberry, J. (2007). "Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope".
{{cite journal}}: Cite journal requires|journal=(help); Unknown parameter|coauthors=ignored (|author=suggested) (help) - ↑ "Overlooked dwarf planet candidates". BBC. 2008-02-19. Retrieved 2008-07-25.
- ↑ Tegler, Stephen C. (2006-01-26). "Kuiper Belt Object Magnitudes and Surface Colors". Archived from the original on 2007-11-16. Retrieved 2006-11-05.
{{cite web}}: Cite has empty unknown parameter:|coauthors=(help); Unknown parameter|deadurl=ignored (|url-status=suggested) (help) - ↑ "HORIZONS Web-Interface". JPL Solar System Dynamics. Archived from the original on 2012-02-08. Retrieved 2008-07-02.
{{cite web}}: External link in|publisher=|deadurl=ignored (|url-status=suggested) (help) - ↑ "JPL Small-Body Database Browser: 90482 Orcus (2004 DW)". 2008-02-10 last obs. Archived from the original on 2012-02-08. Retrieved 2008-07-02.
{{cite web}}: Check date values in:|date=(help); Unknown parameter|deadurl=ignored (|url-status=suggested) (help) - ↑ (90482) Orcus and Vanth Archived 8 February 2012 at WebCite
- ↑ Distant EKO The Kuiper Belt Electronic newsletter, March 2007