132 Aethra

From Wikipedia, the free encyclopedia
Jump to: navigation, search
132 Aethra
132Aethra (Lightcurve Inversion).png
A three-dimensional model of 132 Aethra based on its light curve.
Discovery
Discovered by James C. Watson
Discovery date 13 June 1873
Designations
Named after
Aethra
A922 XB; 1949 MD; 1953 LF
Main belt (Mars crosser)
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 142.50 yr (52049 d)
Aphelion 3.6250 AU (542.29 Gm)
Perihelion 1.5895 AU (237.79 Gm)
2.6073 AU (390.05 Gm)
Eccentricity 0.39036
4.21 yr (1537.7 d)
17.72 km/s
38.271°
0° 14m 2.796s / day
Inclination 24.997°
258.408°
255.216°
Earth MOID 0.769549 AU (115.1229 Gm)
Jupiter MOID 2.19881 AU (328.937 Gm)
Jupiter Tisserand parameter 3.177
Physical characteristics
Dimensions 42.87±1.6 km[1]
35.83 ± 6.59 km[2]
Mass (0.41 ± 2.71) × 1018 kg[2]
Equatorial surface gravity
0.012 m/s²
Equatorial escape velocity
0.023 km/s
5.1684 h (0.21535 d)[1]
0.1990±0.015[1]
Temperature ~168 K
M
9.38[1]

132 Aethra is an M-type main-belt asteroid. It has a rather eccentric orbit that sometimes brings it closer to the Sun than the planet Mars. It was discovered by James Craig Watson in 1873 and is the first such Mars-crosser asteroid to be identified. As a Mars-crosser asteroid, Aethra is the lowest numbered asteroid to not have proper orbital elements due to recurring perturbations by Mars.

With an original observation arc of only 22 days, 132 Aethra was a lost asteroid between 1873 and 1922.[3][4]

The varying light curve of the asteroid implies an elongated or irregular shape for its body.

It is named after Aethra, the mother of Theseus in Greek mythology.

References[edit]

  1. ^ a b c d e "JPL Small-Body Database Browser: 132 Aethra" (2000-06-10 last obs). Retrieved 12 May 2016. 
  2. ^ a b Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336free to read, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009.  See Table 1.
  3. ^ Herget, Paul (1938). "The orbit and perturbations of (132) Aethra". Astronomical Journal. 47 (1081): 17–23. Bibcode:1938AJ.....47...17H. doi:10.1086/105455. 
  4. ^ The planet observer's handbook (2000), By Fred William Price, Page 192. (Google Books 2010)

External links[edit]