118 Peitho

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118 Peitho
Discovery
Discovered by Karl Theodor Robert Luther
Discovery date 15 March 1872
Designations
Named after
Peitho
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 144.05 yr (52615 d)
Aphelion 2.8353 AU (424.15 Gm)
Perihelion 2.03988 AU (305.162 Gm)
2.43757 AU (364.655 Gm)
Eccentricity 0.16315
3.81 yr (1390.1 d)
18.95 km/s
51.1620°
0° 15m 32.328s / day
Inclination 7.7427°
47.701°
33.403°
Earth MOID 1.05849 AU (158.348 Gm)
Jupiter MOID 2.4367 AU (364.53 Gm)
Jupiter Tisserand parameter 3.473
Physical characteristics
Dimensions 41.73±1.5 km
Mass 7.6×1016 kg
Equatorial surface gravity
0.0117 m/s²
Equatorial escape velocity
0.0220 km/s
7.8055 h (0.32523 d)[1]
7.823 h[2]
0.2240±0.017
Temperature ~178 K
S
9.14

118 Peitho is a main-belt asteroid. It is probably an S-type asteroid. It was discovered by R. Luther on March 15, 1872, and named after one of the two Peithos in Greek mythology. There have been two observed Peithoan occultations of a dim star: one was in 2000 and the other in 2003.[3][4]

In 2009, Photometric observations of this asteroid were made at the Palmer Divide Observatory in Colorado Springs, Colorado. The resulting asymmetrical light curve shows a synodic rotation period of 7.823 ± 0.002 hours with a brightness variation of 0.15 ± 0.02 in magnitude. This was reasonably consistent with independent studies performed in 1980 (7.78 hours) and 2009 (7.8033 hours).[2]

References[edit]

  1. ^ a b Yeomans, Donald K., "118 Peitho", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016. 
  2. ^ a b Warner, Brian D. (October 2009), "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2009 March-June", The Minor Planet Bulletin, 36 (4), pp. 172–176, Bibcode:2009MPBu...36..172W, doi:10.1016/j.pss.2012.03.009. 
  3. ^ von Boinik, I. F. B. "Planet (118) Peitho". Astronomische Nachrichten. 145: 31. Bibcode:1897AN....145...31V. doi:10.1002/asna.18981450107. 
  4. ^ NASA Planetary Data System

External links[edit]