| Minorplanet: | yes |
| Background: |
|
| 118 Peitho | |
| Discovered: | 15 March 1872 |
| Mpc Name: | (118) Peitho |
| Alt Names: | A872 EA |
| Pronounced: | [1] |
| Adjective: | Peithoian |
| Named After: | Πειθώ Peithō |
| Epoch: | 31 July 2016 (JD 2457600.5) |
| Semimajor: | 2.43757AU |
| Perihelion: | 2.03988AU |
| Aphelion: | 2.8353abbr=onNaNabbr=on |
| Eccentricity: | 0.16315 |
| Period: | 3.81 yr (1390.1 d) |
| Inclination: | 7.7427° |
| Asc Node: | 47.701° |
| Arg Peri: | 33.403° |
| Avg Speed: | 18.95 km/s |
| Mass: | 7.6 kg |
| Surface Grav: | 0.0117 m/s2 |
| Escape Velocity: | 0.0220 km/s |
| Rotation: | 7.8055abbr=onNaNabbr=on 7.823 h |
| Abs Magnitude: | 9.14 |
| Mean Motion: | / day |
| Observation Arc: | 144.05 yr (52615 d) |
| Uncertainty: | 0 |
| Moid: | 1.05849AU |
| Jupiter Moid: | 2.4367AU |
| Tisserand: | 3.473 |
118 Peitho is a main-belt asteroid. It is probably an S-type asteroid, suggesting a siliceous mineralogy. 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.[2] [3]
This body is orbiting the Sun with a period of 3.81 years and an eccentricity (ovalness) of 0.16. The orbital plane is inclined by 7.7° to the plane of the ecliptic. The cross-section diameter is ~42 km. 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). The lightcurve inversion process has been used to construct a model of this object, suggesting a blocky shape with flattened poles.