(170) Maria

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 byJ. Perrotin
Discovery date10 January 1877
(170) Maria
Main belt (Maria)
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc116.69 yr (42622 d)
Aphelion2.7161 AU (406.32 Gm)
Perihelion2.3923 AU (357.88 Gm)
2.5542 AU (382.10 Gm)
4.08 yr (1491.0 d)
0° 14m 29.184s / day
Earth MOID1.4114 AU (211.14 Gm)
Jupiter MOID2.39948 AU (358.957 Gm)
Physical characteristics
Dimensions44.30±1.0 km
13.120 h (0.5467 d)

Maria (minor planet designation: 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 12 May 2016.
  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), 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.
  3. ^ "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, archived from the original on 13 February 2012, retrieved 7 April 2013.
  4. ^ Veeder, G. J.; et al. (March 1995), "Eos, Koronis, and Maria family asteroids: Infrared (JHK) photometry" (PDF), Icarus, 114, pp. 186–196, Bibcode:1995Icar..114..186V, CiteSeerX, doi:10.1006/icar.1995.1053.
  5. ^ Warner, Brian D. (September 2007), "Asteroid Lightcurve Analysis at the Palmer Divide Observatory", The Minor Planet Bulletin, Bibcode:2007MPBu...34...72W.

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