197 Arete

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197 Arete
Orbita asteroida 197.png
Orbital diagram
Discovery [1]
Discovered by Johann Palisa
Discovery date21 May 1879
Designations
(197) Arete
Pronunciation /əˈriːtiː/ [2]
Named after
 Arete
A879 KA; 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)
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 [5]
Dimensions 29.18±2.4  km
6.6084  h (0.27535  d) [3]
6.54 h [6]
0.4417±0.083 [3]
0.442 [7]
S [8]
9.18 [3]

    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

    1. ↑ "Discovery Circumstances: Numbered Minor Planets". Archived from the original on 17 November 1999.
    2. ↑ Benjamin Smith (1903) The Century Dictionary and Cyclopedia
    3. 1 2 3 4 "JPL Small-Body Database Browser: 197 Arete" (2011-07-02 last obs). Archived from the original on 21 July 2011. Retrieved 18 August 2011.
    4. ↑ "AstDys: 197 Arete" . Retrieved 18 August 2011.
    5. ↑ "The Asteroid Orbital Elements Database". astorb. Lowell Observatory.
    6. ↑ "Asteroid Lightcurve Data Base (LCDB) | PDS SBN Asteroid/Dust Subnode".
    7. ↑ "Infrared Astronomical Satellite (IRAS)". Archived from the original on 24 February 2005. Retrieved 24 February 2005.
    8. ↑ "Asteroid Lightcurve Data File, Updated March 1, 2001". Archived from the original on 20 July 2010.
    9. ↑ 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.
    10. ↑ 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.
    11. ↑ 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.


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