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197 Arete information


197 Arete
Orbital diagram
Discovery[1]
Discovered byJohann Palisa
Discovery date21 May 1879
Designations
MPC designation
(197) Arete
Pronunciation/əˈrt/[2]
Named after
Arete
Alternative designations
A879 KA; 1934 RE1;
1950 DY
Minor planet category
Asteroid belt
Orbital characteristics[3][4]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc136.89 yr (50000 d)
Aphelion3.1882283 AU (476.95216 Gm) (Q)
Perihelion2.2897600 AU (342.54322 Gm) (q)
Semi-major axis
2.7389941 AU (409.74769 Gm) (a)
Eccentricity0.1640143 (e)
Orbital period (sidereal)
4.53 yr (1655.7 d)
Mean anomaly
20.361539° (M)
Mean motion
0° 13m 2.744s / day (n)
Inclination8.793773° (i)
Longitude of ascending node
81.607160° (Ω)
Argument of perihelion
246.46589° (ω)
Earth MOID1.29448 AU (193.651 Gm)
Jupiter MOID2.16829 AU (324.372 Gm)
TJupiter3.314
Physical characteristics[5]
Dimensions29.18±2.4 km
Synodic rotation period
6.6084 h (0.27535 d)[3]
6.54 h[6]
Geometric albedo
0.4417±0.083[3]
0.442[7]
Spectral type
S[8]
Absolute magnitude (H)
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]

  1. ^ "Discovery Circumstances: Numbered Minor Planets". Archived from the original on 17 November 1999.
  2. ^ Benjamin Smith (1903) The Century Dictionary and Cyclopedia
  3. ^ 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.
  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. ^ Cite error: The named reference science160_3825 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference aass67_1_95 was invoked but never defined (see the help page).

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