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Kuiper Belt Object (90482) Orcus
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Kuiper Belt Object (90482) Orcus (2004 DW) is at Opposition (47.134 AU) on the 28th February 2018.



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RE: 90482 Orcus
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Kuiper Belt Object (90482) Orcus (2004 DW) is at Opposition (47.100 AU) in the constellation Sextans on the 25th February 2015.

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     Mag
2015 02 24    10 02 13.8 -08 47 58  47.1003 48.0342   160.5     0.4    19.1
2015 02 25    10 02 09.5 -08 47 35  47.1000 48.0342   160.5     0.4    19.1
2015 02 26    10 02 05.3 -08 47 12  47.1000 48.0343   160.5     0.4    19.1
2015 02 27    10 02 01.1 -08 46 49  47.1003 48.0343   160.4     0.4    19.1
2015 02 28    10 01 56.9 -08 46 25  47.1008 48.0343   160.3     0.4    19.1
2015 03 01    10 01 52.8 -08 46 01  47.1017 48.0344   160.1     0.4    19.1
2015 03 02    10 01 48.6 -08 45 36  47.1028 48.0344   159.9     0.4    19.1
2015 03 03    10 01 44.5 -08 45 11  47.1042 48.0345   159.6     0.4    19.1
2015 03 04    10 01 40.4 -08 44 45  47.1059 48.0345   159.3     0.4    19.1
2015 03 05    10 01 36.3 -08 44 20  47.1079 48.0346   158.9     0.4    19.1
2015 03 06    10 01 32.2 -08 43 54  47.1101 48.0346   158.5     0.4    19.1
2015 03 07    10 01 28.2 -08 43 27  47.1127 48.0347   158.1     0.4    19.1
2015 03 08    10 01 24.2 -08 43 00  47.1155 48.0347   157.6     0.5    19.1
2015 03 09    10 01 20.2 -08 42 33  47.1187 48.0348   157.1     0.5    19.1
2015 03 10    10 01 16.2 -08 42 06  47.1220 48.0348   156.6     0.5    19.1
2015 03 11    10 01 12.3 -08 41 38  47.1257 48.0349   156.0     0.5    19.1
2015 03 12    10 01 08.4 -08 41 11  47.1297 48.0349   155.4     0.5    19.1
2015 03 13    10 01 04.5 -08 40 42  47.1339 48.0350   154.8     0.5    19.1
2015 03 14    10 01 00.7 -08 40 14  47.1384 48.0350   154.2     0.5    19.1
2015 03 15    10 00 56.9 -08 39 45  47.1432 48.0351   153.5     0.5    19.1
2015 03 16    10 00 53.1 -08 39 16  47.1482 48.0351   152.8     0.5    19.1
2015 03 17    10 00 49.4 -08 38 47  47.1536 48.0352   152.1     0.6    19.1
2015 03 18    10 00 45.7 -08 38 18  47.1592 48.0352   151.4     0.6    19.1
2015 03 19    10 00 42.0 -08 37 49  47.1650 48.0353   150.7     0.6    19.1
2015 03 20    10 00 38.4 -08 37 19  47.1712 48.0353   149.9     0.6    19.1
2015 03 21    10 00 34.9 -08 36 49  47.1776 48.0354   149.2     0.6    19.1
2015 03 22    10 00 31.4 -08 36 19  47.1842 48.0354   148.4     0.6    19.1
2015 03 23    10 00 27.9 -08 35 49  47.1911 48.0355   147.6     0.6    19.1
2015 03 24    10 00 24.5 -08 35 18  47.1983 48.0355   146.8     0.7    19.1
2015 03 25    10 00 21.1 -08 34 48  47.2057 48.0356   146.0     0.7    19.1
2015 03 26    10 00 17.8 -08 34 17  47.2134 48.0356   145.2     0.7    19.1
2015 03 27    10 00 14.5 -08 33 46  47.2213 48.0357   144.4     0.7    19.1
2015 03 28    10 00 11.3 -08 33 16  47.2295 48.0357   143.5     0.7    19.1
2015 03 29    10 00 08.1 -08 32 45  47.2379 48.0358   142.7     0.7    19.1
2015 03 30    10 00 05.0 -08 32 14  47.2465 48.0358   141.9     0.7    19.1
2015 03 31    10 00 02.0 -08 31 43  47.2554 48.0359   141.0     0.7    19.1


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Kuiper Belt Object 90482 Orcus is at Opposition (47.079 AU) on the 23rd February 2014

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     Mag
2014 02 22    09 58 54.8 -08 19 56  47.0797 48.0136   160.6     0.4    19.1
2014 02 23    09 58 50.5 -08 19 34  47.0791 48.0136   160.6     0.4    19.1
2014 02 24    09 58 46.3 -08 19 11  47.0789 48.0137   160.6     0.4    19.1
2014 02 25    09 58 42.1 -08 18 48  47.0789 48.0137   160.6     0.4    19.1
2014 02 26    09 58 37.9 -08 18 25  47.0793 48.0138   160.5     0.4    19.1
2014 02 27    09 58 33.7 -08 18 01  47.0799 48.0139   160.4     0.4    19.1
2014 02 28    09 58 29.5 -08 17 37  47.0808 48.0139   160.2     0.4    19.1
2014 03 01    09 58 25.4 -08 17 12  47.0820 48.0140   160.0     0.4    19.1
2014 03 02    09 58 21.2 -08 16 47  47.0836 48.0141   159.7     0.4    19.1
2014 03 03    09 58 17.1 -08 16 22  47.0853 48.0141   159.3     0.4    19.1
2014 03 04    09 58 13.0 -08 15 57  47.0874 48.0142   159.0     0.4    19.1
2014 03 05    09 58 08.9 -08 15 31  47.0898 48.0142   158.6     0.4    19.1
2014 03 06    09 58 04.9 -08 15 04  47.0924 48.0143   158.1     0.4    19.1
2014 03 07    09 58 00.9 -08 14 38  47.0954 48.0144   157.6     0.5    19.1
2014 03 08    09 57 56.9 -08 14 11  47.0986 48.0144   157.1     0.5    19.1
2014 03 09    09 57 52.9 -08 13 44  47.1021 48.0145   156.5     0.5    19.1
2014 03 10    09 57 49.0 -08 13 16  47.1059 48.0146   156.0     0.5    19.1
2014 03 11    09 57 45.1 -08 12 49  47.1099 48.0146   155.4     0.5    19.1
2014 03 12    09 57 41.2 -08 12 21  47.1143 48.0147   154.7     0.5    19.1
2014 03 13    09 57 37.4 -08 11 52  47.1189 48.0147   154.1     0.5    19.1
2014 03 14    09 57 33.6 -08 11 24  47.1238 48.0148   153.4     0.5    19.1
2014 03 15    09 57 29.8 -08 10 55  47.1289 48.0149   152.7     0.5    19.1
2014 03 16    09 57 26.1 -08 10 27  47.1343 48.0149   152.0     0.6    19.1
2014 03 17    09 57 22.4 -08 09 57  47.1400 48.0150   151.3     0.6    19.1
2014 03 18    09 57 18.8 -08 09 28  47.1460 48.0150   150.6     0.6    19.1
2014 03 19    09 57 15.2 -08 08 59  47.1522 48.0151   149.8     0.6    19.1
2014 03 20    09 57 11.7 -08 08 29  47.1587 48.0152   149.0     0.6    19.1
2014 03 21    09 57 08.1 -08 07 59  47.1654 48.0152   148.3     0.6    19.1
2014 03 22    09 57 04.7 -08 07 29  47.1724 48.0153   147.5     0.6    19.1
2014 03 23    09 57 01.3 -08 06 59  47.1796 48.0154   146.7     0.7    19.1
2014 03 24    09 56 57.9 -08 06 29  47.1871 48.0154   145.9     0.7    19.1
2014 03 25    09 56 54.6 -08 05 59  47.1949 48.0155   145.0     0.7    19.1
2014 03 26    09 56 51.3 -08 05 28  47.2029 48.0155   144.2     0.7    19.1
2014 03 27    09 56 48.1 -08 04 58  47.2111 48.0156   143.4     0.7    19.1
2014 03 28    09 56 44.9 -08 04 27  47.2196 48.0157   142.5     0.7    19.1
2014 03 29    09 56 41.8 -08 03 56  47.2284 48.0157   141.7     0.7    19.1
2014 03 30    09 56 38.8 -08 03 25  47.2373 48.0158   140.8     0.8    19.1
2014 03 31    09 56 35.8 -08 02 55  47.2465 48.0158   140.0     0.8    19.1


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KBO 90482 Orcus is at Opposition (47.053 AU) on the 22nd February, 2013

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TNO (90482) Orcus is Stationary on the 25th November, 2012

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TNO (90482) Orcus is at Quadrature on the 24th November, 2012.

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TNO (90482) Orcus
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TNO (90482) Orcus is at Opposition (47.0205 AU) on the 22nd February, 2012.



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Kuiper Belt Object (90482) Orcus
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Kuiper Belt Object (90482) Orcus is a trans-Neptunian object in the Kuiper belt with a large moon. It was discovered on February 17, 2004 by Michael Brown of Caltech, Chad Trujillo of the Gemini Observatory, and David Rabinowitz of Yale University. Precovery images as early as November 8, 1951 were later identified. It is thought to be "nearly certainly" a dwarf planet, although the IAU has not yet formally designated it as such.
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Google earth file: KBO (90482) Orcus.kmz (15kb, kmz)



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Orcus and Vanth
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Orcus and Vanth

Brown and his team studied Orcus with both Hubble and Spitzer, two of the greatest observatories. Here are some facts about the Orcus system that are known reasonably precisely.
  • Vanth's orbit around Orcus. It's nearly circular, with a period of 9.5393 0.0001 days at a distance of 8980 20 kilometers.
  • The total mass of the Vanth-Orcus system. This follows directly from Vanth's orbital period, and is 6.32 0.01 x 1020 kilograms, or, they report, about 3.8% the mass of Eris.
  • The brightness of Vanth with respect to Orcus. At visible wavelengths, Vanth is 2.54 0.01 magnitudes fainter than Orcus.
An orbit of only 9000 kilometers is a really really close orbit. Still, Hubble is capable of resolving Orcus and Vanth as two separate (pointlike) objects. What they learned from looking at Orcus and Vanth with Hubble is that the two bodies have very different surfaces. Neither one shows the gray color and strong evidence of water ice that some other Kuiper belt bodies (like Haumea and Charon) do. There's some evidence for some water ice on Orcus, but Vanth looks like more like typical Kuiper belt bodies, reddish in color. It's not the color of Vanth that's odd; it's the fact that Vanth and Orcus have such different colors. In fact, Vanth and Orcus are less similar in color than any other binary pair yet observed in the Kuiper belt.

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90482 Orcus I
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The name Vanth, the winged Etruscan psychopomp who guides the souls of the dead to the underworld, was chosen from among a large pool of submissions. Vanth was the only suggestion that was purely Etruscan in origin. It was the most popular submission, first suggested by Sonya Taaffe. This submission will be assessed by the IAU's Committee for Small Body Nomenclature, which will vote on whether to approve it, in accordance with the normal object naming procedures.
Source

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