180 Garumna

This article is about the asteroid. For the insect: Garumna and the Latin name of the river in France, see Garonne.

180 Garumna

3D convex shape model of 180 Garumna
Discovery
Discovered by	J. Perrotin
Discovery date	29 January 1878
Designations
MPC designation	(180) Garumna
Pronunciation	/ɡəˈrʌmnə/[1]
Minor planet category	Main belt
Orbital characteristics[2]
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)
Semi-major axis	2.7231 AU (407.37 Gm)
Eccentricity	0.16494
Orbital period (sidereal)	4.49 yr (1641.3 d)
Mean anomaly	301.92°
Mean motion	0° 13^m 9.624^s / day
Inclination	0.86595°
Longitude of ascending node	312.18°
Argument of perihelion	175.87°
Earth MOID	1.28761 AU (192.624 Gm)
Jupiter MOID	1.89216 AU (283.063 Gm)
TJupiter	3.338
Physical characteristics
Synodic rotation period	23.866 h (0.9944 d)
Spectral type	S[3]
Absolute magnitude (H)	10.31

180 Garumna is a main belt asteroid that was discovered by the French astronomer Henri Joseph Perrotin on January 29, 1878.[4] 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.[3]

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.[5]

References

1. Noah Webster (1884) A Practical Dictionary of the English Language
2. Yeomans, Donald K., "180 Garumna", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 6 May 2016.
3. 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 17 March 2014, retrieved 8 April 2013. See appendix A.
4. "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
5. 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.

External links

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