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Asteroid with 2 moons From Wikipedia, the free encyclopedia
107 Camilla is one of the largest asteroids from the outermost edge of the asteroid belt, approximately 250 kilometers (160 miles) in diameter. It is a member of the Sylvia family and located within the Cybele group. It was discovered on 17 November 1868, by English astronomer Norman Pogson at Madras Observatory, India, and named after Camilla, Queen of the Volsci in Roman mythology.[4][2] The X-type asteroid is a rare trinary asteroid with two minor-planet moons discovered in 2001 and 2016, respectively. It is elongated in shape and has a short rotation period of 4.8 hours.[18]
.png) Lightcurve-based 3-D model of Camilla | |
| Discovery[1][2] | |
|---|---|
| Discovered by | N. R. Pogson |
| Discovery site | Madras Obs. |
| Discovery date | 17 November 1868 |
| Designations | |
| (107) Camilla | |
| Pronunciation | /kəˈmɪlə/[3] |
Named after | Camilla (Roman mythology)[4] |
| A868 WA, 1893 QA 1938 OG, 1949 HD1 | |
| main-belt · (outer)[1] Sylvia · Cybele | |
| Adjectives | Camillian or Camillean, /kəˈmɪliən/ |
| Orbital characteristics[1] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 149.17 yr (54,485 d) |
| Aphelion | 3.7202 AU |
| Perihelion | 3.2622 AU |
| 3.4912 AU | |
| Eccentricity | 0.0656 |
| 6.52 yr (2,383 d) | |
| 265.91° | |
| 0° 9m 3.96s / day | |
| Inclination | 10.001° |
| 172.61° | |
| 306.77° | |
| Known satellites | 2[5][6][7] |
| Physical characteristics | |
| Dimensions | 285 km × 205 km × 170 km[8] 344 km × 246 km × 205 km[9] |
| 254±12 km[10] 200.37±3.51 km[11] 210.370±8.326 km[12] 222.62±17.1 km[13] 241.6±35.0 km[14] 243.3±12.4 km[15] | |
| Mass | (11.2±0.1)×1018 kg[10][9] |
Mean density | 1.28±0.04 g/cm3[10] 1.40±0.30 g/cm3[9] |
| 4.844 h[16][17][a] | |
| 0.043±0.012[15] 0.045±0.019[14] 0.0525±0.009[13] 0.059±0.012[12] 0.065±0.003[11] | |
| X (SMASS)[1][18] C (Tholen) P (WISE)[19] B–V = 0.705[1] U–B = 0.298[1] | |
| 11.53[20] | |
| 7.08[1][11][13][14][15][19] 7.1±0.02[18][21][16] | |
Camilla has a very dark surface and primitive carbonaceous composition.
A large number of rotational lightcurves of have been obtained from photometric observations since the 1980s.[22] Best rated results gave a short rotation 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 towards ecliptic coordinates (β, λ) = (+51°, 72°) with a 10° uncertainty,[8] which gives it an axial tilt of 29°. Follow-up modeling of photometric data gave similar results.[23][24][25]
10μ radiometric data collected from Kitt Peak in 1975 gave a first diameter estimate of 209 km.[26] According to the space-based surveys carried out by the Japanese Akari satellite, the Infrared Astronomical Satellite IRAS and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer,[11][12][13][19][21] as well as observations by the Keck Observatory and photometric modeling,[14][15][27][23][24][28][29] Camilla measures between 185 and 247 kilometers in diameter and its surface has an albedo between 0.160 and 0.294.[18]
Camilla is the 6th trinary asteroid that has been discovered in the asteroid belt, after 87 Sylvia, 45 Eugenia, 216 Kleopatra, 93 Minerva and 130 Elektra (a quaternary).
| Discovery[6] | |
|---|---|
| Discovered by | A. Storrs, F. Vilas, R. Landis, E. Wells, C. Woods, B. Zellner, and M. Gaffey |
| Discovery date | 1 March 2001 |
| Orbital characteristics[10] | |
| Observation arc | 5642 days |
| 1247.8±1.3 km | |
| Eccentricity | 0.000±0.004 |
| 3.71234±0.00001 d | |
| Inclination | 16.0°±0.8° |
| Physical characteristics | |
| 12.7±3.5 km, assuming equal albedos and DCamilla = 254 km[10] 16±6 km[9] ~ 11 ± 2 km[27] | |
| Mass | ~1.5×1015 kg[30] |
| 13.18[27] | |
On 1 March 2001, a minor-planet moon 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.[6] It has been designated S/2001 (107) 1 but has not yet received an official name.
Later observations in September 2005 with the Very Large Telescope (VLT) allowed the determination of an orbit. Apart from data in infobox, 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]
| Discovery[7] | |
|---|---|
| Discovered by | M. Marsset, B. Carry, B. Yang, F. Marchis, P. Vernazza, C. Dumas, J. Berthier, F. Vachier |
| Discovery date | 29 May 2015 |
| Orbital characteristics[10] | |
| Observation arc | 428 days |
| 643.8±1.3 km | |
| Eccentricity | 0.18+0.08 −0.06 |
| 1.376±0.005 d | |
| Inclination | 27.7°±7.3° |
| Satellite of | 107 Camilla |
| Physical characteristics | |
| 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 designation S/2016 (107) 1.[7]
Observations were taken between 29 May 2015 and 30 July 2016, using the VLT-SPHERE, the principal 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 a semi-major axis of 340 kilometers.[5]
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