 Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 21 May 1879 |
| Designations | |
| MPC designation | (197) Arete |
| Pronunciation | /əˈriːtiː/ |
| Named after | Arete |
| Alternative designations | A879 KA; 1934 RE1; 1950 DY |
| Minor planet category | Asteroid belt |
| Orbital characteristics | |
| 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) |
| Orbital period (sidereal) | 4.53 yr (1655.7 d) |
| Mean anomaly | 20.361539° (M) |
| Mean motion | 0° 13 2.744 / day (n) |
| Inclination | 8.793773° (i) |
| Longitude of ascending node | 81.607160° (Ω) |
| Argument of perihelion | 246.46589° (ω) |
| Earth MOID | 1.29448 AU (193.651 Gm) |
| Jupiter MOID | 2.16829 AU (324.372 Gm) |
| TJupiter | 3.314 |
| Physical characteristics | |
| Dimensions | 29.18±2.4 km |
| Synodic rotation period | 6.6084 h (0.27535 d) 6.54 h |
| Geometric albedo | 0.4417±0.083 0.442 |
| Spectral type | S |
| Absolute magnitude (H) | 9.18 |
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. 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.
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".
References
- "Discovery Circumstances: Numbered Minor Planets". Archived from the original on 17 November 1999.
- Benjamin Smith (1903) The Century Dictionary and Cyclopedia
- ^ "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.
- "The Asteroid Orbital Elements Database". astorb. Lowell Observatory.
- "Asteroid Lightcurve Data Base (LCDB) | PDS SBN Asteroid/Dust Subnode".
- "Infrared Astronomical Satellite (IRAS)". Archived from the original on 24 February 2005. Retrieved 24 February 2005.
- "Asteroid Lightcurve Data File, Updated March 1, 2001". Archived from the original on 20 July 2010.
- Schmadel, Lutz D. (2003). Dictionary of minor planet names. Vol. 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. S2CID 2555834.
- 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
- 197 Arete at AstDyS-2, Asteroids—Dynamic Site
- 197 Arete at the JPL Small-Body Database
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