181 Eucharis

181 Eucharis
Discovery
Discovered by	Pablo Cottenot
Discovery date	2 February 1878
Designations
MPC designation	(181) Eucharis
Pronunciation	/ˈjuːkərɪs/[1]
Alternative designations	A906 GA
Minor planet category	Main belt
Orbital characteristics[2]
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	123.63 yr (45157 d)
Aphelion	3.7664 AU (563.45 Gm)
Perihelion	2.49280 AU (372.918 Gm)
Semi-major axis	3.12958 AU (468.179 Gm)
Eccentricity	0.20347
Orbital period	5.54 yr (2022.2 d)
Average orbital speed	16.64 km/s
Mean anomaly	32.3207°
Mean motion	0° 10m 40.879s / day
Inclination	18.890°
Longitude of ascending node	143.224°
Argument of perihelion	318.943°
Earth MOID	1.53686 AU (229.911 Gm)
Jupiter MOID	1.47086 AU (220.038 Gm)
TJupiter	3.099
Physical characteristics
Dimensions	106.66±2.2 km
Rotation period	52.23 h (2.176 d)[2][3]
Geometric albedo	0.1135±0.0054
Spectral type	S (Tholen); Xk (Bus)[4]
Absolute magnitude (H)	7.84

Eucharis (minor planet designation: 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.[5] 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.[4] 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.[3]

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.[6]

References

"eucharis". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)
Yeomans, Donald K., "181 Eucharis", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
Stephens, Robert D. (March 2008), "Long Period Asteroids Observed from GMARS and Santana Observatories", The Minor Planet Bulletin, 35 (1), pp. 21–22, Bibcode:2008MPBu...35...21S.
DeMeo, Francesca E.; et al. (July 2009), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF), Icarus, 202 (1), pp. 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, archived from the original (PDF) on 17 March 2014, retrieved 8 April 2013. See appendix A.
"Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
Novaković, Bojan; et al. (November 2011), "Families among high-inclination asteroids", Icarus, 216 (1), pp. 69–81, arXiv:1108.3740, Bibcode:2011Icar..216...69N, doi:10.1016/j.icarus.2011.08.016.

External links

181 Eucharis at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
181 Eucharis at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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[1] "eucharis". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)

[JPL-2] Yeomans, Donald K., "181 Eucharis", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.

[Stephens2008-3] Stephens, Robert D. (March 2008), "Long Period Asteroids Observed from GMARS and Santana Observatories", The Minor Planet Bulletin, 35 (1), pp. 21–22, Bibcode:2008MPBu...35...21S.

[DeMeo2009-4] DeMeo, Francesca E.; et al. (July 2009), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF), Icarus, 202 (1), pp. 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, archived from the original (PDF) on 17 March 2014, retrieved 8 April 2013. See appendix A.

[IAU_MPC-5] "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.

[Novakovic2011-6] Novaković, Bojan; et al. (November 2011), "Families among high-inclination asteroids", Icarus, 216 (1), pp. 69–81, arXiv:1108.3740, Bibcode:2011Icar..216...69N, doi:10.1016/j.icarus.2011.08.016.