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° | |
| 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] |
|
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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
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<references />, or <references group="..." />External links
- ↑ 1.0 1.1 1.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 2.4 Johnston's Archive on (148780) Altjira Retrieved 2011-11-29
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 Transneptunian objects and Centaurs from light curves
