181 Eucharis

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181 Eucharis
Discovered by Pablo Cottenot
Discovery date February 2, 1878
A906 GA
Main belt
Orbital characteristics[1]
Epoch June 14, 2006 (JD 2453900.5)
Aphelion 562.742 Gm (3.762 AU)
Perihelion 376.603 Gm (2.517 AU)
469.672 Gm (3.140 AU)
Eccentricity 0.198
2031.902 d (5.56 a)
16.64 km/s
Inclination 18.801°
Physical characteristics
Dimensions 106.0 km
52.23[2] h
Albedo 0.115 4
Spectral type
S (Tholen)
Xk (Bus)[3]

181 Eucharis is a large, slowly rotating main-belt asteroid that was discovered by French astronomer Pablo Cottenot on February 2, 1878, from Marseille Observatory.[4] It was his only asteroid discovery. This object was named after Eucharis, a Greek nymph.

In the Tholen classification system, it is categorized as a stony S-type asteroid, while the Bus asteroid taxonomy system lists it as an Xk asteroid.[3] Photometric observations of this asteroid at the Goat Mountain Astronomical Research Station in Rancho Cucamonga, California during 2007 gave a light curve with a leisurely rotation period of 52.23 ± 0.05 hours.[2]

This object is the namesake of a family of 149–778 asteroids that share similar spectral properties and orbital elements; hence they may have arisen from the same collisional event. All members have a relatively high orbital inclination.[5]


  1. ^ Yeomans, Donald K., "181 Eucharis", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-30. 
  2. ^ a b Stephens, Robert D. (March 2008), "Long Period Asteroids Observed from GMARS and Santana Observatories", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 35 (1): 21–22, Bibcode:2008MPBu...35...21S. 
  3. ^ a b DeMeo, Francesca E.; et al. (July 2009), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF), Icarus 202 (1): 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, retrieved 2013-04-08.  See appendix A.
  4. ^ "Numbered Minor Planets 1–5000", Discovery Circumstances (IAU Minor Planet center), retrieved 2013-04-07. 
  5. ^ Novaković, Bojan; et al. (November 2011), "Families among high-inclination asteroids", Icarus 216 (1): 69–81, arXiv:1108.3740, Bibcode:2011Icar..216...69N, doi:10.1016/j.icarus.2011.08.016.