170 Maria

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170 Maria
Asteroid Maria passing near a cluster of galaxies
Asteroid Maria passing near a cluster of galaxies as seen by a four inch telescope over a period of nearly two hours.
Discovered by J. Perrotin
Discovery date January 10, 1877
Main belt (Maria)
Orbital characteristics[1]
Aphelion 2.718 AU
Perihelion 2.388 AU
2.553 AU
Eccentricity 0.065
4.08 years
Inclination 14.40°
Physical characteristics
Dimensions 44.3 km
13.14 hours
Albedo 0.158
Spectral type

170 Maria is a Main belt asteroid that was discovered by French astronomer Henri Joseph Perrotin on January 10, 1877.[3] Its orbit was computed by Antonio Abetti, and the asteroid was named after his sister, Maria. This is the namesake of the Maria asteroid family; one of the first asteroid families to be identified by Japanese astronomer Kiyotsugu Hirayama in 1918.[4]

In the Tholen classification system, this is categorized as a stony S-type asteroid.[2] Observations performed at the Palmer Divide Observatory in Colorado Springs, Colorado during 2007 produced a light curve with a period of 13.120 ± 0.002 hours and a brightness range of 0.21 ± 0.02 in magnitude. Previous measurements from 2000 gave 13.14 and 5.510 hour estimates for the period.[5] Based upon its spectrum, it is classified as an S-type asteroid.

An occultation of a star by Maria was observed from Manitoba, Canada, on June 10, 1997.


  1. ^ Yeomans, Donald K., "170 Maria", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-04-07. 
  2. ^ 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.
  3. ^ "Numbered Minor Planets 1–5000", Discovery Circumstances (IAU Minor Planet center), retrieved 2013-04-07. 
  4. ^ Veeder, G. J.; et al. (March 1995), "Eos, Koronis, and Maria family asteroids: Infrared (JHK) photometry", Icarus 114: 186–196, Bibcode:1995Icar..114..186V, doi:10.1006/icar.1995.1053, CiteSeerX: 
  5. ^ Warner, Brian D. (September 2007), "Asteroid Lightcurve Analysis at the Palmer Divide Observatory", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers, Bibcode:2007MPBu...34...72W.