90482 Orcus
90482 Orcus (symbol: 
), originally known by the provisional designation 2004 DW, is a Kuiper belt object (KBO). It is also 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. Like Pluto it is in orbital resonance with Neptune but it stays on the opposite side of the Sun from Pluto.
 | |
| 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] | |
Moon
A moon of Orcus was found on 22 February 2007.[7]
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 Archived 2007-03-22 at the Wayback Machine
- First BBC article
- First New Scientist article
- Updated orbital elements from Lowell Observatory Archived 2007-05-22 at the Wayback Machine
- 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.
- ↑ Stansberry, J.; Grundy, W.; Brown, M.; et al. (2007). "Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope". arXiv:astro-ph/0702538.
{cite journal}: Cite journal requires|journal=(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.
- ↑ "HORIZONS Web-Interface". JPL Solar System Dynamics. Archived from the original on 2012-02-08. Retrieved 2008-07-02.
- ↑ "JPL Small-Body Database Browser: 90482 Orcus (2004 DW)". 2008-02-10. Archived from the original on 2012-02-08. Retrieved 2008-07-02.
- ↑ "(90482) Orcus and Vanth". Archived from the original on 2012-02-08. Retrieved 2009-02-27.
{cite web}: CS1 maint: bot: original URL status unknown (link) - ↑ Distant EKO The Kuiper Belt Electronic newsletter, March 2007
