Back 90482 Orcus Afrikaans (90482) Orcus AN 90482 أوركوس Arabic 90482 اوركوس ARZ (90482) Орк Byelorussian Аркус BE-X-OLD 90482 Оркус Bulgarian (90482) Orc Catalan Orcus (planetka) Czech Орк CV
90482 Orcus (symbol: .svg){kind=small}
), 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 Dwarf planet Plutoid TNO KBO[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] | |
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- ↑ 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.