103 Hera
| Discovery | |
|---|---|
| Discovered by | James Craig Watson[1] |
| Discovery date | September 7, 1868[1] |
| Designations | |
Named after | Hera |
| 1927 CV, 1950 CM | |
| Main belt | |
| Orbital characteristics[2] | |
| Epoch August 27, 2011 (JD 2455800.5)[1] | |
| Aphelion | 437.17 Gm (2.9223 AU)[1] |
| Perihelion | 371.24 Gm (2.4816 AU)[1] |
| 404.202 Gm (2.702 AU)[1] | |
| Eccentricity | 0.0815455[1] |
| 1622.213 d (4.4414 a)[1] | |
Average orbital speed | 18.09 km/s |
| 74.835° | |
| Inclination | 5.421° |
| 136.276° | |
| 190.160° | |
| Physical characteristics | |
| Dimensions | 91.2 km |
| Mass | 7.9×1017 kg |
| 0.0255 m/s² | |
| 0.0482 km/s | |
| 0.9892[3] d | |
| Temperature | ~170 K |
Spectral type | S[4] |
| 7.66 | |
|
| |
103 Hera is a moderately large main-belt asteroid that was discovered by Canadian-American astronomer James Craig Watson on September 7, 1868,[5] and named after Hera, queen and fifth in power of the Olympian gods in Greek mythology. It is an S-type asteroid[4] with a silicate surface composition.
Photometric observations made in 2010 at the Organ Mesa Observatory at Las Cruces, New Mexico, and the Hunters Hill Observatory at Ngunnawal, Australian Capital Territory, give a synodic rotation period of 23.740 ± 0.001 hours. The bimodal light curve shows a maximum brightness variation of 0.45 ± 0.03 in magnitude.[3]
Measurements made with the IRAS observatory give a diameter of 91.58 ± 4.14 km and a geometric albedo of 0.19 ± 0.02. By comparison, the MIPS photometer on the Spitzer Space Telescope gives a diameter of 88.30 ± 8.51 km and a geometric albedo of 0.20 ± 0.04. When the asteroid was observed occulting a star, the results showed a diameter of 89.1 ± 1.1 km.[6]
References
- 1 2 3 4 5 6 7 8 JPL Small-Body Database Browser
- ↑ Yeomans, Donald K., "103 Hera", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-25.
- 1 2 Pilcher, Frederick (January 2011), "Rotation Period Determination for 103 Hera", The Minor Planet Bulletin 38 (1), p. 32, Bibcode:2011MPBu...38...32P.
- 1 2 DeMeo, Francesca E.; et al. (2011), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF), Icarus 202 (1): 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, retrieved 2013-03-22. See appendix A.
- ↑ "Numbered Minor Planets 1–5000", Discovery Circumstances (IAU Minor Planet center), retrieved 2013-04-07.
- ↑ Ryan, Erin Lee; et al. (April 2012), "The Kilometer-Sized Main Belt Asteroid Population as Revealed by Spitzer", eprint arXiv, arXiv:1204.1116, Bibcode:2012arXiv1204.1116R.
External links
- 103 Hera at the JPL Small-Body Database
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