691 Lehigh
| Discovery | |
|---|---|
| Discovered by | Joel Hastings Metcalf |
| Discovery site | Taunton, Massachusetts |
| Discovery date | 11 December 1909 |
| Designations | |
| (691) Lehigh | |
| Pronunciation | /ˈliːhaɪ/[1] |
| 1909 JG | |
| Orbital characteristics[2] | |
| 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) |
| 3.0115 AU (450.51 Gm) | |
| Eccentricity | 0.12194 |
| 5.23 yr (1908.9 d) | |
| 189.349° | |
| 0° 11m 18.924s / day | |
| Inclination | 13.010° |
| 87.997° | |
| 304.466° | |
| Physical characteristics | |
| 43.84±0.85 km | |
| 12.891 h (0.5371 d) | |
| 0.0438±0.002 | |
| 9.2 | |
691 Lehigh is an asteroid orbiting the Sun in the asteroid belt, discovered in 1909.[3] It is named after Lehigh University, where its orbit was calculated in the Masters Thesis of Joseph B. Reynolds, following the observations of amateur astronomer Joel Metcalf. The asteroid is a CD:-type asteroid, suggesting its surface is largely carbonaceous, with many primitive molecules similar to those of comets. Due to this, it has a cometlike surface albedo of just 0.05, similar to fresh asphalt, meaning that it reflects only 5% of light that hits it. Lehigh is not known to be a member of any collisional asteroid family.
References
[edit]- ^ Noah Webster (1884) A Practical Dictionary of the English Language
- ^ "691 Lehigh (1909 JG)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 5 May 2016.
- ^ "(691) Lehigh". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. 2007. p. 67. doi:10.1007/978-3-540-29925-7_692. ISBN 9783540299257.
External links
[edit]- Planet Lehigh: Early Astronomy, Lehigh University – Special Collections
- Lightcurve plot of 691 Lehigh, Palmer Divide Observatory, B. D. Warner (2009)
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 691 Lehigh at AstDyS-2, Asteroids—Dynamic Site
- 691 Lehigh at the JPL Small-Body Database
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