182 Elsa

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182 Elsa
182Elsa (Lightcurve Inversion).png
A three-dimensional model of 182 Elsa based on its light curve.
Discovered by J. Palisa
Discovery date 7 February 1878
MPC designation (182) Elsa
Pronunciation /ˈɛlzə/
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 111.99 yr (40906 d)
Aphelion 2.8641 AU (428.46 Gm)
Perihelion 1.9681 AU (294.42 Gm)
2.4161 AU (361.44 Gm)
Eccentricity 0.18541
3.76 yr (1371.7 d)
0° 15m 44.784s / day
Inclination 2.0045°
Earth MOID 0.979343 AU (146.5076 Gm)
Jupiter MOID 2.48085 AU (371.130 Gm)
TJupiter 3.492
Physical characteristics
Mean radius
21.84±2.05 km
80.088 h (3.3370 d)[1][2]

182 Elsa is a Main belt asteroid that was discovered by Johann Palisa on February 7, 1878.[4] The origin of the name is uncertain; it may be named after the character in the legend of Lohengrin perpetuated by Richard Wagner's opera of the same name. Based upon its spectrum, it is classified as a stony S-type asteroid.

It rotates very slowly; in 1980 its rotation period (or "day") was estimated to be about 3.3 Earth days. In 2008, a collaborative effort from three different sites was used to build a complete light curve for the asteroid, which showed a period of 80.088 ± 0.002 hours with a brightness variation of 0.30 ± 0.03 in magnitude.[2] A possible companion has been proposed to explain the slow rotation.

Elsa has very amplified lightcurve indicating an elongated or irregular body, it was one of five minor planets included in the 1993 study, Transition Comets -- UV Search for OH Emissions in Asteroids, which was research involving amateur astronomers who were permitted to make use of the Hubble Space Telescope.

During 2002, 182 Elsa was observed by radar from the Arecibo Observatory, the return signal matched an effective diameter of 44 ± 10 km. This is consistent with the asteroid dimensions computed through other means.[3]


  1. ^ a b Yeomans, Donald K., "182 Elsa", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 6 May 2016. 
  2. ^ a b Pilcher, Frederick; et al. (April 2009), "Period Determination for 182 Elsa: A Collaboration Triumph", The Minor Planet Bulletin, 36 (2), pp. 57–60 40, Bibcode:2009MPBu...36...40P. 
  3. ^ a b Magri, Christopher; et al. (January 2007), "A radar survey of main-belt asteroids: Arecibo observations of 55 objects during 1999–2003", Icarus, 186 (1): 126–151, Bibcode:2007Icar..186..126M, doi:10.1016/j.icarus.2006.08.018 
  4. ^ "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 2013-04-07. 

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