Orcus

90482 Orcus
90482 Orcus
	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)	Min. 4 530 000 000 km; Maks. 7 190 700 000 km;
Halve storakse	5 859 700 000 km
Excentricitet	0,22701
Siderisk omløbstid	245,19 år (89.557 dage)
Omløbshastighed	Gnsn. 16 848 km/t;
Banehældning	20.592°
Periapsisargument; ω	72,614 °
Opstigende knudes længde; Ω	268,6964 °
Omgivelser
	1 måne (Vanth)
Fysiske egenskaber
Diameter	910+50−40 km;; 917±25 km
Masse	(6.348±0.019)×1020 kg
Massefylde	1.53+0.15−0.13 g/cm3 kg/m³
Tyngdeacc. v. ovfl.	≈ 0,2 m/s²
Undvigelseshastighed v. ækv.	≈ 1 548 km/t
Rotationstid	13,188 t
Albedo	0.231+0.018−0.011 %
Temperatur v. ovfl.	Gnsn. < 44 K °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]

^ 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. 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.

[brown2018-1] 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.

[TNOsCool8-2] 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-orbits-3] 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. Hentet 2019-11-13.

[jpldata-4] "JPL Small-Body Database Browser: 90482 Orcus (2004 DW)" (2020-01-04 last obs.). Jet Propulsion Laboratory. 29. januar 2020. Hentet 20. februar 2020.

[Barucci2008-5] 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.

[distantplanetoid-6] "Distant Planetoid". solarsystem.nasa.gov. NASA. Hentet 18. maj 2019.

[7] 2004 DW. Astrophysics Data System, marts 2004. Hentet 4. februar 2022.

[8] 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.

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