148780 Altjira
Discovery | |
---|---|
Discovery site | Deep Ecliptic Survey at Kitt Peak[1] |
Discovery date |
20 October 2001 March, 2007 (secondary)[2] |
Designations | |
MPC designation | (148780) Altjira |
2001 UQ18 | |
Cubewano (DES)[3] | |
Orbital characteristics[1] | |
Epoch 13 January 2016 (JD 2457400.5) | |
Uncertainty parameter 3 | |
Observation arc | 2539 days (6.95 yr) |
Aphelion | 46.877 AU (7.0127 Tm) |
Perihelion | 41.572 AU (6.2191 Tm) |
44.224 AU (6.6158 Tm) | |
Eccentricity | 0.059979 |
294.10 yr (107421 d) | |
124.29° | |
0.0033513°/day | |
Inclination | 5.2056° |
2.0132° | |
297.71° | |
Known satellites | 1 |
Earth MOID | 40.5577 AU (6.06735 Tm) |
Jupiter MOID | 36.442 AU (5.4516 Tm) |
Physical characteristics | |
Dimensions | ≈128–200 (primary)[4] and 100–180 km (secondary) |
Mass | 3.952×1018 kg[4] |
Mean density | 0.5–2.0 g/cm3[4] |
0.06–0.14[4] | |
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] | |
|
148780 Altjira /ælˈtʃɪrə/ 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]
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.
References
- 1 2 3 "JPL Small-Body Database Browser: 148780 Altjira (2001 UQ18)" (2008-10-02 last obs). Retrieved 26 March 2016.
- 1 2 3 4 5 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.
- 1 2 3 4 5 6 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.
- 1 2 Transneptunian objects and Centaurs from light curves
External links
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