Camilla has a very dark surface and primitivecarbonaceous composition.
A large number of rotationallightcurves of have been obtained fromphotometric observations since the 1980s.[22] Best rated results gave a shortrotation period of 4.844 hours with a brightness amplitude between 0.32 and 0.53 magnitude.[16][17][a]
Lightcurve analysis indicates that Camilla's pole most likely points towardsecliptic coordinates (β, λ) = (+51°, 72°) with a 10° uncertainty,[8] which gives it anaxial tilt of 29°. Follow-up modeling of photometric data gave similar results.[23][24][25]
On 1 March 2001, aminor-planet moon of Camilla was found by A. Storrs, F. Vilas, R. Landis, E. Wells, C. Woods, B. Zellner, and M. Gaffey using theHubble Space Telescope.[6] It has the provisional designationS/2001 (107) 1 but has not yet received an official name.
Later observations in September 2005 with theVery Large Telescope (VLT) allowed the determination of an orbit. In addition to the data in the infobox at right, the inclination was found to be 3 ± 1° with respect to an axis pointing towards (β, λ) = (+55°, 75°). Given the ~10° uncertainty in the actual rotational axis of Camilla, one can say that the orbit's inclination is less than 10°.
The satellite is estimated to measure about 11 km in diameter.[27] Assuming a similar density to the primary, this would give it an approximate mass of ~1.5×1015 kg. It has a similar colour to the primary.[6]
4.0±1.2 km, assuming equal albedos and DCamilla = 254 km[10]
In 2016, the discovery of a second satellite of Camilla was reported by astronomers at Cerro Paranal's Very Large Telescope in Chile. It has the provisional designationS/2016 (107) 1.[7]
Observations were taken between 29 May 2015 and 30 July 2016, using theVLT-SPHERE, theprincipal instrument attached to the 8-meter "Melipal" (UT3) unit of the VLT. On 3 out of 5 observation sessions, the new satellite could be detected.[7] The body's orbit has asemi-major axis of 340 kilometers.[5]
^abPietschnig (2011) web: Photometric observations from 28 March 2007. Rotation period4.844±0.003 hours with a brightness amplitude of0.47 magnitude. Quality code of 3. Summary figures atCollaborative Asteroid Lightcurve Link (CALL)
^abcdefgPajuelo, M.; Carry, B.; Vachier, F.; Marsset, M.; Berthier, J.; Descamps, P.; Merline, W.J.; Tamblyn, P.M.; Grice, J.; Conrad, A.; Storrs, A.; Timerson, B.; Dunham, D.; Preston, S.; Vigan, A.; Yang, B.; Vernazza, P.; Fauvaud, S.; Bernasconi, L.; Romeuf, D.; Behrend, R.; Dumas, C.; Drummond, J.D.; Margot, J.-L.; Kervella, P.; Marchis, F.; Girard, J.H. (July 2018). "Physical, spectral, and dynamical properties of asteroid (107) Camilla and its satellites".Icarus.309:134–161.arXiv:1803.02722.doi:10.1016/j.icarus.2018.03.003.
^abcdUsui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey".Publications of the Astronomical Society of Japan.63 (5):1117–1138.Bibcode:2011PASJ...63.1117U.doi:10.1093/pasj/63.5.1117. (online,AcuA catalog p. 153)
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