_Peitho.png) 3D convex shape model of 118 Peitho | |
| Discovery | |
|---|---|
| Discovered by | Karl Theodor Robert Luther |
| Discovery date | 15 March 1872 |
| Designations | |
| (118) Peitho | |
| Pronunciation | /ˈpaɪθoʊ/[1] |
Named after | ΠειθώPeithō |
| A872 EA | |
| Main belt | |
| Adjectives | Peithoian/paɪˈθoʊ.iən/ |
| Orbital characteristics[2] | |
| 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 |
| 3.81yr (1390.1d) | |
Averageorbital speed | 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) |
| TJupiter | 3.473 |
| Physical characteristics | |
| Dimensions | 41.73±1.5 km |
| Mass | 7.6×1016 kg |
Equatorialsurface gravity | 0.0117 m/s2 |
Equatorialescape velocity | 0.0220 km/s |
| 7.8055 h (0.32523 d)[2] 7.823 h[3] | |
| 0.2240±0.017 | |
| Temperature | ~178K |
| S | |
| 9.14 | |
118 Peitho is amain-beltasteroid. It is probably anS-type asteroid, suggesting asiliceous mineralogy. It was discovered byR. Luther on March 15, 1872, and named after one of the twoPeithos inGreek mythology. There have been two observed Peithoanoccultations of a dimstar: one was in 2000 and the other in 2003.[4][5]
This body is orbiting theSun with aperiod of 3.81 years and aneccentricity (ovalness) of 0.16. Theorbital plane isinclined by 7.7° to theplane of the ecliptic. The cross-section diameter is ~42 km. In 2009,Photometric observations of this asteroid were made at the Palmer Divide Observatory inColorado Springs, Colorado. The resulting asymmetricallight curve shows a synodicrotation period of 7.823 ± 0.002 hours with a brightness variation of 0.15 ± 0.02 inmagnitude. This was reasonably consistent with independent studies performed in 1980 (7.78 hours) and 2009 (7.8033 hours).[3] Thelightcurve inversion process has been used to construct a model of this object,[6] suggesting a blocky shape with flattened poles.
_mathilde.jpg) | This article about an S-type asteroid native to theasteroid belt is astub. You can help Wikipedia byexpanding it. |
