&sq=&lang=&file=File:Salacia_and_Actaea_Keck-NIRC2_brightened.jpg) Salacia and its moon Actaea, imaged by the Keck telescope on 3 August 2010. Actaea is the fainter object to the left of Salacia. | |
| Discovery | |
|---|---|
| Discovered by | Keith S. Noll, Harold F. Levison, Denise C. Stephen, William M. Grundy |
| Discovery date | 21 July 2006 |
| Designations | |
Designation | Salacia I |
| Pronunciation | /ækˈtiːə/ |
| S/2006 (120347) 1 | |
| Adjectives | Actaean /ækˈtiːən/ |
| Orbital characteristics[1] | |
| 5724±27 km | |
| Eccentricity | 0.0098±0.0038 |
| 5.493882±0.000023 days | |
| Inclination | 23.59±0.36° |
| 45.2±1.6° | |
| 134±23° | |
| Satellite of | Salacia |
| Physical characteristics | |
| Dimensions | 284±10 km[1] |
| Mass | ≈ 20×1018 kg |
| Albedo | ≈ 0.035 +0.010/−0.007[citation needed] |
Spectral type | V–I = 0.89±0.02 (Actaea) |
| 1.9 mag[citation needed] | |
Actaea, officially (120347) Salacia I Actaea, is a natural satellite of the classical Kuiper belt object 120347 Salacia. Its diameter is estimated to be approximately 300 km (190 mi), which is approximately one-third the diameter of Salacia; thus, Salacia and Actaea are viewed by William Grundy et al. to be a binary system. Assuming that the following size estimates are correct, Actaea is about the sixth-biggest known moon of a trans-Neptunian object, after Charon (1212 km), Dysnomia (700 km),[2] Vanth (443 km),[3] Ilmarë (326 km),[4] and Hiʻiaka (320 km), but possibly also Hiisi (250 km).
- ^ a b Grundy, W. M.; Noll, K. S.; Roe, H. G.; Buie, M. W.; Porter, S. B.; Parker, A. H.; Nesvorný, D.; Benecchi, S. D.; Stephens, D. C.; Trujillo, C. A. (2019). "Mutual Orbit Orientations of Transneptunian Binaries" (PDF). Icarus. 334: 62–78. Bibcode:2019Icar..334...62G. doi:10.1016/j.icarus.2019.03.035. ISSN 0019-1035. S2CID 133585837. Retrieved 2019-10-26.
- ^ Brown, Michael E.; Butler, Bryan J. (2018-09-18). "Medium-sized satellites of large Kuiper belt objects". The Astronomical Journal. 156 (4): 164. arXiv:1801.07221. Bibcode:2018AJ....156..164B. doi:10.3847/1538-3881/aad9f2. S2CID 119343798.
- ^ Sickafoose, A. A.; Bosh, A. S.; Levine, S. E.; Zuluaga, C. A.; Genade, A.; Schindler, K.; Lister, T. A.; Person, M. J. (2019-02-01). "A stellar occultation by Vanth, a satellite of (90482) Orcus". Icarus. 319: 657–668. arXiv:1810.08977. Bibcode:2019Icar..319..657S. doi:10.1016/j.icarus.2018.10.016. S2CID 119099266.
- ^ Grundy, W.M.; Porter, S.B.; Benecchi, S.D.; Roe, H.G.; Noll, K.S.; Trujillo, C.A.; Thirouin, A.; Stansberry, J.A.; Barker, E.; Levison, H.F. (September 2015). "The mutual orbit, mass, and density of the large transneptunian binary system Varda and Ilmarë". Icarus. 257: 130–138. arXiv:1505.00510. Bibcode:2015Icar..257..130G. doi:10.1016/j.icarus.2015.04.036. S2CID 44546400.