197 Arete
| Discovery[1] | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 1879-05-21 |
| Designations | |
| Pronunciation | /əˈriːtiː/ ə-REE-tee |
|
Named after
|
Arete |
| 1934 RE1 1950 DY | |
| Asteroid belt | |
| Orbital characteristics[2][3] | |
| Epoch August 27, 2011 | |
| Aphelion | 3.1790723 AU (Q) |
| Perihelion | 2.3005757 AU (q) |
| 2.7398240 AU (a) | |
| Eccentricity | 0.1603199 |
| 4.54 yr (1656.4656 d) | |
| 349.14185° (M) | |
| Inclination | 8.79334° |
| 81.65294° (Ω) | |
| 246.54836° (ω) | |
| Physical characteristics | |
| Dimensions | 29.2 km |
| 6.54 h[4] | |
| Albedo | 0.442[5] |
|
Spectral type
|
S[6] |
| 9.18[2] | |
197 Arete is an asteroid in the asteroid belt. It has a very bright surface, unusually bright even for a rocky S-type asteroid.
It was discovered by J. Palisa on May 21, 1879, and named after Arete, the mother of Nausicaa in Homer's The Odyssey.[7] Every 18 years, this asteroid approaches within 0.04 AU of 4 Vesta. During these encounters, Vesta causes a gravitational perturbation of Arete, allowing the mass of Vesta to be directly determined.[8]
Photometric observations during 1984 showed a rotation period of 6.54 ± 0.02 hours and a brightness variation of 0.10 ± 0.01 in magnitude. The light curve shows "four well defined extrema with two asymmetric maxima".[9]
References
- ↑ http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html
- ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ http://sbn.psi.edu/pds/resource/lc.html
- ↑ http://dorothy.as.arizona.edu/DSN/IRAS/index_iras.html
- ↑ http://spiff.rit.edu/richmond/parallax/phot/LCSUMPUB.TXT
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 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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