107 Camilla

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107 Camilla
107Camilla (Lightcurve Inversion).png
A three-dimensional model of 107 Camilla based on its light curve.
Discovery
Discovered by Norman Robert Pogson
Discovery date 17 November 1868
Designations
Pronunciation /kəˈmɪlə/ kə-MIL
A893 QA; 1938 OG; 1949 HD1
Outer Main belt (Cybele)
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 147.36 yr (53824 d)
Aphelion 3.7201 AU (556.52 Gm)
Perihelion 3.25843 AU (487.454 Gm)
3.48925 AU (521.984 Gm)
Eccentricity 0.066152
6.52 yr (2380.7 d)
15.95 km/s
175.049°
0° 9m 4.388s / day
Inclination 10.003°
172.610°
306.956°
Earth MOID 2.28486 AU (341.810 Gm)
Jupiter MOID 1.35486 AU (202.684 Gm)
Jupiter Tisserand parameter 3.101
Physical characteristics
Dimensions (344×246×205)±14 km[2]
285×205×170 ± 20 km[3][4][5][6]
Mass 1.12×1019 kg[2]
1.09±0.04×1019 kg [7][8]
Mean density
1.40±0.30 g/cm³[2]
~1.9 g/cm³ [7]
Equatorial surface gravity
~0.036 m/s²
Equatorial escape velocity
0.10 km/s
4.844 h (0.2018 d)[1]
0.2018 d (4.84393 h)[3]
0.0525±0.009[1]
0.0525[5]
Temperature ~151 K
max: 223 K (-52°C)
C[9]
11.53[10] to 13.93
7.08[1][5]

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.[11]

10µ radiometric data collected from Kitt Peak in 1975 gave a diameter estimate of 209 km.[12] 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)[edit]

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.[13] 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.[7] Apart from data in infobox, the inclination was found to be 3 ± 1° with respect to an axis pointing towards (β, λ) = (+55°, 75°).[7] 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.[4] 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.[13]

S/2001 (107) 1
Discovery[13]
Discovered by A. Storrs, F. Vilas,
R. Landis, E. Wells,
C. Woods, B. Zellner,
and M. Gaffey
Discovery date 1 March 2001
Designations
Main belt (Cybele)
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[4]
Mass ~1.5×1015 kg[14]
Equatorial escape velocity
~ 6 m/s
13.18[4]

References[edit]

  1. ^ a b c d Yeomans, Donald K., "107 Camilla", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 12 May 2016. 
  2. ^ a b c Jim Baer (2008). "Recent Asteroid Mass Determinations". Personal Website. Retrieved 2008-12-05. 
  3. ^ a b c J. Torppa, et al. (2003). "Shapes and rotational properties of thirty asteroids from photometric data" (PDF). Icarus 164 (2): 346. Bibcode:2003Icar..164..346T. doi:10.1016/S0019-1035(03)00146-5. 
  4. ^ a b c d F. Marchis, et al. (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. PMC 2600456. PMID 19081813. 
  5. ^ a b c Supplemental IRAS Minor Planet Survey
  6. ^ Axis ratios (rounded to nearest 5 km) based on lightcurve analysis of Torppa et al. (2003), however taking IRAS mean diameter is inconsistent with the maximum value of the short axis obtained in Marchis et al. (2006). Hence, presumably IRAS measurements were taken of a large face. Therefore, anchoring absolute size by requiring the shortest axis to be no larger than the maximum allowed by Marchis et al. (2006).
  7. ^ a b c d e 107 Camilla and S/2001 (107) 1, F. Marchis
  8. ^ Error estimate derived from consideration of and given errors in a and P. See propagation of uncertainty.
  9. ^ PDS spectral class data
  10. ^ "AstDys (107) Camilla Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 2010-06-28. 
  11. ^ Lutz D. Schmadel, Dictionary of Minor Planets Names, p.25.
  12. ^ Morrison, D.; Chapman, C. R. (March 1976), "Radiometric diameters for an additional 22 asteroids", Astrophysical Journal 204, pp. 934–939, Bibcode:2008mgm..conf.2594S, doi:10.1142/9789812834300_0469. 
  13. ^ a b c IAUC 7599
  14. ^ Assuming a similar density to the primary.

External links[edit]