79360 Sila–Nunam
79360 Sila–Nunam (provisional designation 1997 CS29) is a cold classical Kuiper belt object (cubewano) and binary system made up of components of almost equal size, called Sila and Nunam, orbiting beyond Neptune in the Solar System. The name of the system is the combined names of the two bodies, Sila and Nunam.
Sila–Nunam imaged by the Hubble Space Telescope in 2004 | |
| Discovery | |
|---|---|
| Discovered by | J. X. Luu D. C. Jewitt C. A. Trujillo J. Chen |
| Discovery site | Mauna Kea Obs. |
| Discovery date | 4 February 1997 |
| Designations | |
MPC designation | (79360) Sila–Nunam |
| Pronunciation | /ˈsiːlə ˈnuːnəm/ |
Alternative designations | 1997 CS29 |
Minor planet category | TNO (cubewano) |
| Adjectives | Silaupian, Nunaupian |
| Orbital characteristics | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 3 | |
| Observation arc | 6940 days (19.00 yr) |
| Aphelion | 44.8452 AU (6.70875 Tm) |
| Perihelion | 43.3862 AU (6.49048 Tm) |
Semi-major axis | 44.1157 AU (6.59961 Tm) |
| Eccentricity | 0.016536 |
Orbital period (sidereal) | 293.02 yr (107026 d) |
Mean anomaly | 331.884° |
Mean motion | 0.00336367°/day |
| Inclination | 2.240951° |
Longitude of ascending node | 304.34152° |
| ≈ 20 October 2055 ±3 months | |
| 222.597° | |
| Known satellites | 1 at 2,777 ± 19 km (1,725 ± 10 mi) |
| Earth MOID | 42.3938 AU (6.34202 Tm) |
| Jupiter MOID | 37.9599 AU (5.67872 Tm) |
| Physical characteristics | |
| Dimensions | ≈ 250±30 km (Sila) ≈ 235±28 km (Nunam) (335+41 −42 km combined) |
| Mass | 1.084 ± 0.022×1019 kg (combined) |
Mean density | 0.72+0.37 −0.22 g/cm3 |
Synodic rotation period | 300.24 h (12.510 d) |
Sidereal rotation period | 12.50995 ± 0.00036 d |
| 0.086+0.026 −0.017 | |
| Temperature | ~42 K (−384 °F) |
| U−B=0.73 B−V=1.08 V−R=0.66±0.04 B−R=1.74 V−I=1.25±0.03 R−J=1.4 V−J=2.06±0.03 J−H=0.38±0.08 V−H=2.45±0.08 | |
| 21.54–21.78 (2014–2015) | |
| (combined) 5.5, (individual) 6.2 & 6.3 (diff. = 0.12), 5.2 | |
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