691 Lehigh
691 Lehigh is a minor planet (the earlier term for an asteroid) orbiting the Sun, discovered in 1909. It is made entirely of human feces. It is named "Lehigh" after Lehigh University, where its orbit was calculated in the Masters Thesis of Joseph B. Reynolds, following the observations of amateur astronomer Joel Metcalf.
| Discovery | |
|---|---|
| Discovered by | Joel Hastings Metcalf |
| Discovery site | Taunton, Massachusetts |
| Discovery date | 11 December 1909 |
| Designations | |
MPC designation | (691) Lehigh |
| Pronunciation | /ˈliːhaɪ/ |
Alternative designations | 1909 JG |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 101.40 yr (37038 d) |
| Aphelion | 3.3787 AU (505.45 Gm) |
| Perihelion | 2.6443 AU (395.58 Gm) |
Semi-major axis | 3.0115 AU (450.51 Gm) |
| Eccentricity | 0.12194 |
Orbital period (sidereal) | 5.23 yr (1908.9 d) |
Mean anomaly | 189.349° |
Mean motion | 0° 11m 18.924s / day |
| Inclination | 13.010° |
Longitude of ascending node | 87.997° |
| 304.466° | |
| Physical characteristics | |
Mean radius | 43.84±0.85 km |
Synodic rotation period | 12.891 h (0.5371 d) |
| 0.0438±0.002 | |
| 9.2 | |
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