105 Artemis
| Discovery | |
|---|---|
| Discovered by | James Craig Watson |
| Discovery date | September 16, 1868 |
| Designations | |
| Named after | Artemis |
| Minor planet category | Main belt |
| Adjective | Artemidean, Artemidian |
| Orbital characteristics[1] | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 417.698 Gm (2.792 AU) |
| Perihelion | 292.465 Gm (1.955 AU) |
| Semi-major axis | 355.081 Gm (2.374 AU) |
| Eccentricity | 0.176 |
| Orbital period |
1335.678 d (3.66 a) |
| Average orbital speed | 19.18 km/s |
| Mean anomaly | 34.364° |
| Inclination | 21.461° |
| Longitude of ascending node | 188.353° |
| Argument of perihelion | 56.486° |
| Physical characteristics | |
| Dimensions | 119.10 ± 6.78[2] km |
| Mass | (1.54 ± 0.54) × 1018[2] kg |
| Mean density | 1.73 ± 0.67[2] g/cm3 |
| Equatorial surface gravity | 0.0333 m/s² |
| Escape velocity | 0.0630 km/s |
| Rotation period | 37.15[3] h |
| Temperature | ~180 K |
| Spectral type |
C (Tholen) Ch (Bus)[4] |
| Absolute magnitude (H) | 8.57 |
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105 Artemis is a main-belt asteroid that was discovered by J. C. Watson on September 16, 1868 at Ann Arbor, Michigan. It was named after Artemis, the goddess of the hunt, moon, and crossways in Greek Mythology.[5]
Several Artemidian stellar occultations have been reported. An occultation of the star HD 197999 was observed in 1982, which gave an estimated chord length of 110 km.[6] It is a C-type asteroid,[4] meaning that it is very dark and composed of carbonaceous material. Although is shares a similar orbit to the Phocaea family of S-type asteroids, its classification means 105 Artemis is not a member.[7]
In 1988, this object was detected with radar from the Arecibo Observatory at a distance of 1.07 AU. The measured radar cross-section was 1,800 km2.[8] Photometric measurement of this asteroid made in 2010 at Organ Mesa Observatory in Las Cruces, New Mexico produced an irregular light curve with a period of 37.150 ± 0.001 hours. During each rotation, the brightness varies by 0.16 ± 0.01 in magnitude.[3]
Based upon radar data, the estimated near surface solid density of the asteroid is
3.0+0.9
−0.8 g cm–3.[9] Refined observations by the Arecibo Observatory, reported in 2006, showed a complex surface with varying albedo. Analysis of the spectra of 105 Artemis shows the presence of hydrated minerals at some rotation angles, but not at others.[10]
References
- ↑ Yeomans, Donald K., "105 Artemis", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-25.
- ↑ 2.0 2.1 2.2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- ↑ 3.0 3.1 Pilcher, Frederick (October 2010), "New Lightcurves of 40 Harmonia and 105 Artemis", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 37 (4): 167, Bibcode:2010MPBu...37..167P.
- ↑ 4.0 4.1 DeMeo, Francesca E. et al. (2011), "An extension of the Bus asteroid taxonomy into the near-infrared", Icarus 202 (1): 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, retrieved 2013-03-22. See appendix A.
- ↑ Schmade, Lutz (2003), Dictionary of Minor Planet Names 1 (5th ed.), Springer, p. 25, ISBN 3540002383.
- ↑ Byrne, P. B. et al. (September 1982), "Observations of the occultation of HD 197999 by the minor planet 105 Artemis", Monthly Notices of the Royal Astronomical Society 200: 65P–68P, Bibcode:2010MPBu...37..167P.
- ↑ Carruba, Valerio et al. (September 2009), "An Analysis of the Region of the Phocaea Dynamical Family", American Astronomical Society, DPS meeting #41, #27.04, Bibcode:2009DPS....41.2704C, retrieved 2013-03-18.
- ↑ Ostro, S. J. et al. (October 1991), "Asteroid radar astrometry", Astronomical Journal 102: 1490–1502, Bibcode:1991AJ....102.1490O, doi:10.1086/115975.
- ↑ Magri, C. et al. (December 2001), "Radar constraints on asteroid regolith compositions using 433 Eros as ground truth", Meteoritics & Planetary Science 36 (12): 1697–1709, Bibcode:2001M&PS...36.1697M, doi:10.1111/j.1945-5100.2001.tb01857.x.
- ↑ Hanson, Heather M. et al. (December 2006), "Correlating Arecibo Radar and IRTF Near-Infrared Spectral Observations of 105 Artemis", Bulletin of the American Astronomical Society 38: 933, Bibcode:2006AAS...209.2504H.
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