| Discovery[1] | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 21 May 1879 |
| Designations | |
MPC designation | (197) Arete |
| Pronunciation | /əˈriːtiː/[2] |
Named after | Arete |
| 1934 RE1 1950 DY | |
| Asteroid belt | |
| Orbital characteristics[3][4] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 136.89 yr (50000 d) |
| Aphelion | 3.1882283 AU (476.95216 Gm) (Q) |
| Perihelion | 2.2897600 AU (342.54322 Gm) (q) |
Semi-major axis | 2.7389941 AU (409.74769 Gm) (a) |
| Eccentricity | 0.1640143 (e) |
| 4.53 yr (1655.7 d) | |
| 20.361539° (M) | |
| 0° 13m 2.744s / day (n) | |
| Inclination | 8.793773° (i) |
| 81.607160° (Ω) | |
| 246.46589° (ω) | |
| Earth MOID | 1.29448 AU (193.651 Gm) |
| Jupiter MOID | 2.16829 AU (324.372 Gm) |
| TJupiter | 3.314 |
| Physical characteristics[8] | |
| Dimensions | 29.18±2.4 km |
| 6.6084 h (0.27535 d)[3] 6.54 h[5] | |
| 0.4417±0.083[3] 0.442[6] | |
| S[7] | |
| 9.18[3] | |
Arete (minor planet designation: 197 Arete) is an asteroid in the asteroid belt. It has a very bright surface, even so when compared to other 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.[9] 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.[10]
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".[11]
References
- ^ http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html
- ^ Benjamin Smith (1903) The Century Dictionary and Cyclopedia
- ^ a b c d "JPL Small-Body Database Browser: 197 Arete" (2011-07-02 last obs). Archived from the original on 21 July 2011. Retrieved 18 August 2011.
- ^ "AstDys: 197 Arete". Retrieved 18 August 2011.
- ^ http://sbn.psi.edu/pds/resource/lc.html
- ^ "Infrared Astronomical Satellite (IRAS)". Archived from the original on 24 February 2005. Retrieved 24 February 2005.
- ^ http://spiff.rit.edu/richmond/parallax/phot/LCSUMPUB.TXT
- ^ "The Asteroid Orbital Elements Database". astorb. Lowell Observatory.
- ^ Schmadel, Lutz D. (2003). Dictionary of minor planet names. 1 (5th ed.). Berlin Heidelberg New York: Springer-Verlag. pp. 32–33. ISBN 3-540-00238-3.
- ^ Hertz, Hans G. (19 April 1968). "Mass of Vesta". Science. 160 (3825): 299–300. Bibcode:1968Sci...160..299H. doi:10.1126/science.160.3825.299. PMID 17788233.
- ^ di Martino, M.; Zappala, V.; de Campos, J. A.; Debehogne, H.; Lagerkvist, C.-I. (September 1988), "Rotational properties and lightcurves of the minor planets 94, 107, 197, 201, 360, 451, 511 and 702", Astronomy and Astrophysics Supplement Series, 67 (1): 95–101, Bibcode:1987A&AS...67...95D.
External links
