197 Arete

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

    1. ↑ http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html
    2. ↑ 2.0 2.1 "JPL Small-Body Database Browser: 197 Arete" (2011-07-02 last obs). Archived from the original on 21 July 2011. Retrieved 2011-08-18.
    3. ↑ "AstDys: 197 Arete". Retrieved 2011-08-18.
    4. ↑ http://sbn.psi.edu/pds/resource/lc.html
    5. ↑ http://dorothy.as.arizona.edu/DSN/IRAS/index_iras.html
    6. ↑ http://spiff.rit.edu/richmond/parallax/phot/LCSUMPUB.TXT
    7. ↑ Schmadel, Lutz D. (2003). Dictionary of minor planet names, Volume 1 (5th ed.). Berlin Heidelberg New York: Springer-Verlag. pp. 32–33. ISBN 3-540-00238-3.
    8. ↑ Hertz, Hans G. (April 19, 1968). "Mass of Vesta". Science 160 (3825): 299–300. Bibcode:1968Sci...160..299H. doi:10.1126/science.160.3825.299. PMID 17788233.
    9. ↑ 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.