136 Austria

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136 Austria
Discovered by Johann Palisa
Discovery date March 18, 1874
Named after
Main belt
Orbital characteristics[1]
Epoch December 31, 2006 (JD 2454100.5)
Aphelion 371.048 Gm (2.480 AU)
Perihelion 313.089 Gm (2.093 AU)
342.069 Gm (2.287 AU)
Eccentricity 0.085
1262.933 d (3.46 a)
19.66 km/s
Inclination 9.570°
Physical characteristics
Dimensions 40.14[2] km
Mass 6.8×1016 kg
0.0112 m/s²
0.0212 km/s
11.4969[1] h
Albedo 0.1459[2]
Temperature ~184 K
Spectral type

136 Austria is a main-belt asteroid that was found by the prolific asteroid discoverer Johann Palisa on March 18, 1874, from the Austrian Naval Observatory in Pola, Istria.[3] It was his first asteroid discovery and was given the Latin name of his homeland.

Based upon its spectrum, it is classified as an M-type spectrum, although Clark et al. (1994) suggest it may be more like an S-type asteroid.[4] It shows almost no absorption features in the near infrared, which may indicate an iron or enstatite chondrite surface composition. A weak hydration feature was detected in 2006.[5]

Photometric observations of this asteroid at the European Southern Observatory in 1981 gave a light curve with a period of 11.5 ± 0.1 hours and a brightness variation of 0.40 in magnitude.[2] As of 2013, the estimated rotation period is 11.4969[6] hours.


  1. ^ a b Yeomans, Donald K., "136 Austria", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-25. 
  2. ^ a b c d Schober, H. J. (January 1983), "Rotation periods and lightcurves of the asteroids 136 Austria and 238 Hypatia", Astronomy and Astrophysics 117 (2): 362–364, Bibcode:1983A&A...117..362S. 
  3. ^ Albrecht, R.; et al. (July 2001), "Early asteroid research in Austria", Planetary and Space Science 49 (8): 777–779, Bibcode:2001P&SS...49..777A, doi:10.1016/S0032-0633(01)00027-7. 
  4. ^ Clark, B. E.; et al. (March 1994), "Infrared Spectral Observations of Smaller (50 km) Main Belt S, K, and M Type Asteroids", Abstracts of the 25th Lunar and Planetary Science Conference, held in Houston, TX, 14–18 March 1994: 265–266, Bibcode:1994LPI....25..265C. 
  5. ^ Hardersen, Paul S.; Gaffey, Michael J.; Abell, Paul A. (January 1983), "Near-IR spectral evidence for the presence of iron-poor orthopyroxenes on the surfaces of six M-type asteroids" (PDF), Icarus 175 (1): 141–158, Bibcode:2005Icar..175..141H, doi:10.1016/j.icarus.2004.10.017, retrieved 2013-03-30. 
  6. ^ Behrend, Raoul, Courbes de rotation d'astéroïdes et de comètes (in French), Observatoire de Genève, retrieved 2013-03-30