180 Garumna

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180 Garumna
Discovered by J. Perrotin
Discovery date 29 January 1878
MPC designation (180) Garumna
Pronunciation /ɡəˈrʌmnə/
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 96.73 yr (35331 d)
Aphelion 3.1722 AU (474.55 Gm)
Perihelion 2.2739 AU (340.17 Gm)
2.7231 AU (407.37 Gm)
Eccentricity 0.16494
4.49 yr (1641.3 d)
0° 13m 9.624s / day
Inclination 0.86595°
Earth MOID 1.28761 AU (192.624 Gm)
Jupiter MOID 1.89216 AU (283.063 Gm)
TJupiter 3.338
Physical characteristics
23.866 h (0.9944 d)

180 Garumna is a main belt asteroid that was discovered by the French astronomer Henri Joseph Perrotin on January 29, 1878.[3] Its name comes from the ancient Latin name for the Garonne River in France. In the Tholen classification system, it is categorized as a stony S-type asteroid, while the Bus asteroid taxonomy system lists it with the Sr sub-type.[2]

The rotation period of this asteroid is very nearly equal to that of the rotation of the Earth. This means that only a small portion of the light curve can be observed from any one location, requiring measurements from multiple sites in order to build a complete curve. In 2012, this mission was accomplished, giving a period of 23.866 ± 0.001 hours with a brightness variation of 0.42 ± 0.02 in magnitude. Allowing for a margin of error and changes in phase angle, this finding agrees with previous measurements made in 2008 and 2011.[4]


  1. ^ Yeomans, Donald K., "180 Garumna", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 6 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): 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, archived from the original (PDF) on 2014-03-17, retrieved 2013-04-08.  See appendix A.
  3. ^ "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 2013-04-07. 
  4. ^ Pilcher, Frederick; et al. (April 2012), "Rotation Period Determination for 180 Garumna: A Triumph of Global Collaboration", The Minor Planet Bulletin, 39 (2): 46, Bibcode:2012MPBu...39...46P, ISSN 1052-8091. 

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