136 Austria

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136 Austria
Discovery [1]
Discovered byJohann Palisa
Discovery siteAustrian Naval Obs.
Discovery date18 March 1874
MPC designation(136) Austria
Named after
1950 HT
main-belt[1][2] · (inner)
Orbital characteristics[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc141.11 yr (51,539 d)
Aphelion2.4812 AU
Perihelion2.0927 AU
2.2869 AU
3.46 yr (1,263 d)
0° 17m 6s / day
Physical characteristics
Mean diameter
40.14±1.0 km[2]
40.14 km[4]
Mass6.8×1016 kg
11.4969 h (0.47904 d)[2]

Austria (minor planet designation: 136 Austria) is a main-belt asteroid that was found by the prolific asteroid discoverer Johann Palisa on 18 March 1874, from the Austrian Naval Observatory in Pola, Istria.[5] 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.[6] 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.[7]

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.[4] As of 2013, the estimated rotation period is 11.4969[8] hours.


  1. ^ a b "136 Austria". Minor Planet Center. Retrieved 29 May 2018.
  2. ^ a b c d e "JPL Small-Body Database Browser: 136 Austria" (2018-02-26 last obs.). Jet Propulsion Laboratory. Retrieved 29 May 2018.
  3. ^ "Asteroid 136 Austria". Small Bodies Data Ferret. Retrieved 29 May 2018.
  4. ^ 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), pp. 362–364, Bibcode:1983A&A...117..362S.
  5. ^ Albrecht, R.; et al. (July 2001), "Early asteroid research in Austria", Planetary and Space Science, 49 (8), pp. 777–779, Bibcode:2001P&SS...49..777A, doi:10.1016/S0032-0633(01)00027-7.
  6. ^ 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, pp. 265–266, Bibcode:1994LPI....25..265C.
  7. ^ 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", Icarus, 175 (1), pp. 141–158, Bibcode:2005Icar..175..141H, doi:10.1016/j.icarus.2004.10.017.
  8. ^ Behrend, Raoul, Courbes de rotation d'astéroïdes et de comètes (in French), Observatoire de Genève, retrieved 2013-03-30

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