Orcus
90482 Orcus .svg){kind=small} | |
|---|---|
 Orcus med sin måne Vanth fotograferet fra Hubble-rumteleskopet i 2006 | |
| Opdaget | |
| 17. februar 2004, af M. E. Brown, C. Trujillo og D. Rabinowitz | |
| Kredsløb om Solen | |
| Afstand til Solen (massecenter) |
|
| Halve storakse | 5 859 700 000 km |
| Excentricitet | 0,22701 |
| Siderisk omløbstid | 245,19 år (89.557 dage) |
| Omløbshastighed |
|
| Banehældning | 20.592° |
| Periapsisargument; ω | 72,614 ° |
| Opstigende knudes længde; Ω | 268,6964 ° |
| Omgivelser | |
| 1 måne (Vanth) | |
| Fysiske egenskaber | |
| Diameter | 910+50−40 km;[1] 917±25 km[2] |
| Masse | (6.348±0.019)×1020[3] kg |
| Massefylde | 1.53+0.15−0.13 g/cm3[2] kg/m³ |
| Tyngdeacc. v. ovfl. | ≈ 0,2 m/s² |
| Undvigelseshastighed v. ækv. | ≈ 1 548 km/t |
| Rotationstid | 13,188 t[4] |
| Albedo | 0.231+0.018−0.011[2] % |
| Temperatur v. ovfl. | Gnsn. < 44 K[5] °C |
90482 Orcus er et trans-Neptunsk objekt i Kuiperbæltet i vores solsystem. Det har en diameter på omtrent 910 kilometer. Orcus blev opdaget i 2004 af de tre amerikanske astronomer Chad Trujillo, Mike Brown (California Institute of Technology) og David Rabinowitz (Yale University).[7]
I 2005 viste optagelser fra Hubble-rumteleskopet, at Orcus havde en tilhørende måne med en omløbstid på lidt under 10 dage. Orcus' måne blev i 2010 navngivet Vanth.[8]
Referencer
- ^ Brown, Michael E.; Butler, Bryan J. (22. januar 2018). "Medium-sized satellites of large Kuiper belt objects". The Astronomical Journal. 156 (4): 164. arXiv:1801.07221. doi:10.3847/1538-3881/aad9f2.
- ^ a b c Fornasier, S.; Lellouch, E.; Müller, P., T.; et al. (2013). "TNOs are Cool: A survey of the trans-Neptunian region. VIII. Combined Herschel PACS and SPIRE observations of 9 bright targets at 70–500 µm". Astronomy & Astrophysics. 555: A92. arXiv:1305.0449v2. Bibcode:2013A&A...555A..15F. doi:10.1051/0004-6361/201321329.
- ^ Grundy, Will M.; Noll, Keith S.; Roe, Henry G.; Buie, Marc W.; Porter, Simon B.; Parker, Alex H.; Nesvorný, David; Levison, Harold F.; Benecchi, Susan D.; Stephens, Denise C.; Trujillo, Chad A. (2019). "Mutual Orbit Orientations of Transneptunian Binaries" (PDF). Icarus. 334: 62-78. Bibcode:2019Icar..334...62G. doi:10.1016/j.icarus.2019.03.035. ISSN 0019-1035. Arkiveret fra originalen (PDF) 15. januar 2020. Hentet 2019-11-13.
- ^ "JPL Small-Body Database Browser: 90482 Orcus (2004 DW)" (2020-01-04 last obs.). Jet Propulsion Laboratory. 29. januar 2020. Hentet 20. februar 2020.
- ^ Barucci, M. A.; Merlin; Guilbert; Bergh; Doressoundiram; et al. (2008). "Surface composition and temperature of the TNO Orcus". Astronomy and Astrophysics. 479 (1): L13-L16. Bibcode:2008A&A...479L..13B. doi:10.1051/0004-6361:20079079.
- ^ "Distant Planetoid". solarsystem.nasa.gov. NASA. Hentet 18. maj 2019.
- ^ 2004 DW. Astrophysics Data System, marts 2004. Hentet 4. februar 2022.
- ^ Brown, M.E., Ragozzine, D., Stansberry, J., Fraser, W.C. (2010) The size, density, and formation of the Orcus-Vanth system in the Kuiper belt. The Astronomical Journal 139: 2700–2705. doi:10.1088/0004-6256/139/6/2700.
Links
| Solen og planeterne | |
|---|---|
| Solens planeter | |
| Andre objektklassificeringer i solsystemet: | |
| Andre objekter med bane i og uden for solsystemet: |
|
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