148780 Altjira
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 | |
| 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 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
Dreamtime and then retired to the sky.[1]
Altjira may be an unresolved hierarchical triple system.[6]
References
- ^ a b c d "JPL Small-Body Database Browser: 148780 Altjira (2001 UQ18)" (2008-10-02 last obs). Retrieved 26 March 2016.
- ^ a b c d e 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.
- ^ S2CID 9571163.
- ^ .
- arXiv:2403.12786 [astro-ph.EP].
External links
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