107 Camilla

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107 Camilla
107Camilla (Lightcurve Inversion).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
MPC designation (107) Camilla
Pronunciation /kəˈmɪlə/ (kə-MIL)
Named after
Camilla (Roman mythology)[3]
1938 OG · 1949 HD1
A893 QA
main-belt · (outer)[1]
Cybele
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 147.93 yr (54,032 days)
Aphelion 3.7201 AU
Perihelion 3.2597 AU
3.4899 AU
Eccentricity 0.0660
6.52 yr (2,381 days)
205.29°
0° 9m 4.32s / day
Inclination 10.003°
172.61°
306.95°
Known satellites 2[4][5][6]
Physical characteristics
Dimensions 185 km[7]
200.37±3.51 km[8]
210.370±8.326 km[9]
214±28 km[10]
219.374±5.938 km[11]
219.378 km[12][13]
222.62±17.1 km (IRAS:27)[14]
227±24 km[15]
241.6±35.0 km[16]
243.3±12.4 km[17]
246±13 km[18]
247 km[19]
285×205×170 ± 20 km[20]
344×246×205 ± 14 km[21]
Mass 1.12×1019 kg[21]
Mean density
1.40±0.30 g/cm³[21]
4.840 h[22]
4.8425±0.0006 h[23]
4.8433±0.0003 h[23]
4.8439 h[24]
4.843928 h[15][10][25]
4.84393 h[26][27][28][20]
4.84394 h[29]
4.84399±0.00005 h[23]
4.844 h[30][31][a]
4.845±0.005 h[32]
4.85 h[33]
0.042[19]
0.043±0.012[17]
0.045±0.019[16]
0.0525±0.009 (IRAS:27)[14]
0.053[12]
0.0540±0.0113[11]
0.059±0.012[9]
0.065±0.003[8]
B–V = 0.705 [1]
U–B = 0.298 [1]
C (Tholen), X (SMASS)[1]
P[11] · X[13]
11.53[34]
7.08[1][11][14][8] · 7.08±0.1[16] · 7.08±0.12[17] · 7.1±0.02[13][12][30]

107 Camilla (kə-MIL) 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 on 17 November 1868, by English astronomer Norman Pogson at Madras Observatory, India, and named after Camilla, Queen of the Volsci in Roman mythology.[3][2]

10µ radiometric data collected from Kitt Peak in 1975 gave a diameter estimate of 209 km.[35] Lightcurve analysis indicates that Camilla's pole most likely points towards ecliptic coordinates (β, λ) = (+51°, 72°) with a 10° uncertainty,[20] which gives it an axial tilt of 29°.

Satellites[edit]

First satellite[edit]

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.[5] 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.[7] 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.[5]

Second satellite[edit]

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.[6]

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.[6] The body's orbit has a semi-major axis of 340 kilometers.[4]

The "Johnstonsarchive" estimates an orbital period of 12 hours, and derives a diameter for the second satellite of 3.5±0.5 kilometers with a tertiary-to-primary mean-diameter ratio of 0.016±0.002.[4]

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.

S/2001 (107) 1
Discovery[5]
Discovered by A. Storrs, F. Vilas,
R. Landis, E. Wells,
C. Woods, B. Zellner,
and M. Gaffey
Discovery date 1 March 2001
Orbital characteristics[7]
1235 ± 16 km
Eccentricity 0.006 ± 0.002
3.710 ± 0.001 d
24.2 m/s
Inclination < 10°
Satellite of 107 Camilla
Physical characteristics
Dimensions ~ 11 ± 2 km[7]
Mass ~1.5×1015 kg[36]
Equatorial escape velocity
~ 6 m/s
13.18[7]

Notes[edit]

  1. ^ Pietschnig (2011) web: Photometric observations from 28 March 2007. Rotation period 4.844±0.003 hours with a brightness amplitude of 0.47 magnitude. Quality code of 3. Summary figures at www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=107%7CCamilla

References[edit]

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  2. ^ a b "107 Camilla". Minor Planet Center. Retrieved 30 March 2017. 
  3. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (107) Camilla. Springer Berlin Heidelberg. p. 25. ISBN 978-3-540-00238-3. Retrieved 30 March 2017. 
  4. ^ a b c Johnston, Robert (23 June 2015). "(107) Camilla, S/2001 (107) 1, and S/2016 (107) 1". johnstonsarchive.net. Retrieved 30 March 2017. 
  5. ^ a b c d IAUC 7599
  6. ^ a b c Marsset, M.; Carry, B.; Yang, B.; Marchis, F.; Vernazza, P.; Dumas, C.; et al. (August 2016). "S/2016 (107) 1". IAU Circ. Bibcode:2016IAUC.9282....1M. Retrieved 30 March 2017. 
  7. ^ a b c d e Marchis, F.; Kaasalainen, M.; Hom, E. F. Y.; Berthier, J.; Enriquez, J.; Hestroffer, D.; et al. (November 2006). "Shape, size and multiplicity of main-belt asteroids. I. Keck Adaptive Optics survey". Icarus. 185 (1): 39–63. Bibcode:2006Icar..185...39M. doi:10.1016/j.icarus.2006.06.001. Retrieved 30 March 2017. 
  8. ^ a b c Usui, 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" (PDF). Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 30 March 2017. 
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  14. ^ a b c Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved 30 March 2017. 
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  36. ^ Assuming a similar density to the primary.

External links[edit]