107 Camilla is one of the largest main-belt asteroids. It orbits within the Cybele Group, beyond most main-belt asteroids. It has a very dark surface and primitive carbonaceous composition. It was discovered by N. R. Pogson on November 17, 1868, and named after Camilla, Queen of the Volsci in Roman mythology.[1]
10µ radiometric data collected from Kitt Peak in 1975 gave a diameter estimate of 209 km.[2] Lightcurve analysis indicates that Camilla's pole most likely points towards ecliptic coordinates (β, λ) = (+51°, 72°) with a 10° uncertainty,[3] which gives it an axial tilt of 29°.
Satellite (S/2001 (107) I)
On 1 March 2001, a satellite of Camilla was found by A. Storrs, F. Vilas, R. Landis, E. Wells, C. Woods, B. Zellner, and M. Gaffey using the Hubble Space Telescope.[4] It has been designated S/2001 (107) 1 but has not yet received an official name.
Later observations in September 2005 with the VLT allowed the determination of an orbit.[5] Apart from data in infobox, the inclination was found to be 3 ± 1° with respect to an axis pointing towards (β, λ) = (+55°, 75°).[5] 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.[6] 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.[4]
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107 Camilla
![](../I/m/107Camilla_(Lightcurve_Inversion).png)
A three-dimensional model of 107 Camilla based on its light curve. | Discovery |
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Discovered by |
Norman Robert Pogson |
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Discovery date |
November 17, 1868 |
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Designations |
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Pronunciation |
// kə-MIL-ə |
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A893 QA; 1938 OG; 1949 HD1 |
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Outer Main belt (Cybele) |
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Orbital characteristics[8] |
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Epoch December 31, 2006 (JD 2454100.5) | Aphelion |
560.937 Gm (3.750 AU) |
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Perihelion |
479.343 Gm (3.204 AU) |
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520.140 Gm (3.477 AU) |
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Eccentricity |
0.078 |
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2368.050 d (6.48 a) |
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15.95 km/s |
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1.746° |
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Inclination |
10.048° |
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173.132° |
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309.877° |
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Physical characteristics |
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Dimensions |
(344×246×205)±14 km[9] 285×205×170 ± 20 km[3][6][10][11] |
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Mass |
1.12×1019 kg[9] 1.09±0.04×1019 kg [5][12] |
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1.40±0.30 g/cm³[9] ~1.9 g/cm³ [5] |
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~0.036 m/s² |
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0.10 km/s |
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0.2018 d (4.84393 h)[3] |
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Albedo |
0.0525[10] |
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Temperature |
~151 K max: 223 K (-52°C) |
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Spectral type |
C[13] |
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11.53[14] to 13.93 |
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7.08[10] |
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