astro.wikisort.org - Asteroid148780 Altjira is a binary classical Kuiper belt object (cubewano).[2] The secondary, S/2007 (148780) 1, is large compared to the primary, 140 kilometres (87 mi) vs. 160 kilometres (99 mi).[4] The Altjiran lightcurve is quite flat (Δmag<0.10), which is indicative of a "quasi-spherical body with a homogeneous surface".[5]
(148780) Altjira |
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Discovery site | Deep Ecliptic Survey at Kitt Peak[1] |
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Discovery date | 20 October 2001 August 2006 (secondary)[2] |
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MPC designation | (148780) Altjira |
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Pronunciation | |
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Alternative designations | 2001 UQ18 |
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Minor planet category | Cubewano (DES)[3] |
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Adjectives | Altjirian |
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Epoch 13 January 2016 (JD 2457400.5) |
Uncertainty parameter 3 |
Observation arc | 2539 days (6.95 yr) |
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Aphelion | 46.877 AU (7.0127 Tm) |
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Perihelion | 41.572 AU (6.2191 Tm) |
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Semi-major axis | 44.224 AU (6.6158 Tm) |
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Eccentricity | 0.059979 |
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Orbital period (sidereal) | 294.10 yr (107421 d) |
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Mean anomaly | 124.29° |
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Mean motion | 0.0033513°/day |
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Inclination | 5.2056° |
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Longitude of ascending node | 2.0132° |
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Argument of perihelion | 297.71° |
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Known satellites | 1 |
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Dimensions | ≈128–200 (primary)[4] and 100–180 km (secondary) |
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Mass | 3.952×1018 kg[4] |
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Mean density | 0.5–2.0 g/cm3[4] |
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Geometric albedo | 0.06–0.14[4] |
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Absolute magnitude (H) | 5.7[1] 5.6,[5] 5.4,[2] or 5.1[2] (primary) secondary's magnitude difference with primary's: 0.7 ± 0.2[2] |
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The satellite's orbit has the following parameters: semi-major-axis, 9904 ± 56 km; period, 139.561 ± 0.047 days; eccentricity, 0.3445 ± 0.0045; and inclination, 35.19 ± 0.19°(retrograde). The total system mass is about 4 × 1018 kg.[4]
It was named after the Arrernte creation deity, Altjira, who created the Earth during the Dreamtime and then retired to the sky.[1]
References
- "JPL Small-Body Database Browser: 148780 Altjira (2001 UQ18)" (2008-10-02 last obs). Retrieved 26 March 2016.
- Johnston's Archive on (148780) Altjira Retrieved 2011-11-29
- Marc W. Buie. "Orbit Fit and Astrometric record for 148780". SwRI (Space Science Department). Retrieved 2011-11-29.
- Grundy, W. M.; Noll, K. S.; Nimmo, F.; Roe, H. G.; Buie, M. W.; Porter, S. B.; Benecchi, S. D.; Stephens, D. C.; Levison, H. F.; Stansberry, J. A. (2011). "Five new and three improved mutual orbits of transneptunian binaries" (PDF). Icarus. 213 (2): 678. arXiv:1103.2751. Bibcode:2011Icar..213..678G. doi:10.1016/j.icarus.2011.03.012. S2CID 9571163.
- Transneptunian objects and Centaurs from light curves
External links
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- (148779) 2001 UJ18
- 148780 Altjira
- (148781) 2001 UL19
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На других языках
[de] (148780) Altjira
(148780) Altjira ist ein transneptunisches Objekt im Kuipergürtel, das als Cubewano eingestuft wird. Der Asteroid hat einen Durchmesser von 246 km. Zusammen mit seinem Mond (148780) Altjira 1, der mit einem Durchmesser von etwa 221 km etwas kleiner als Altjira ist, bildet Altjira ein Doppelasteroidensystem.
- [en] 148780 Altjira
[ru] (148780) Алтьира
Алтьи́ра[1] (148780 Altjira по каталогу ЦМП[2]) — крупный классический объект пояса Койпера. Открыт 20 октября 2001 Марком Буйе в обсерватории Китт-Пик. 2 февраля 2007 года объект был включён в каталог малых планет под номером 148780[3].
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