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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 JPL Small-Body Database Browser
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found. See appendix A.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
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