691 Lehigh

691 Lehigh
Discovery
Discovered by	Joel Hastings Metcalf
Discovery site	Taunton, Massachusetts
Discovery date	11 December 1909
Designations
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°
Argument of perihelion	304.466°
Physical characteristics
Mean radius	43.84±0.85 km
Synodic rotation period	12.891 h (0.5371 d)
Geometric albedo	0.0438±0.002
Absolute magnitude (H)	9.2

691 Lehigh is an asteroid orbiting the Sun in the asteroid belt, discovered in 1909. 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

↑ 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

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
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
691 Lehigh at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

This article about a C-type asteroid native to the asteroid belt is a stub. You can help Wikipedia by adding missing information.

[1] Noah Webster (1884) A Practical Dictionary of the English Language

[jpldata-2] "691 Lehigh (1909 JG)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 5 May 2016.

[3] "(691) Lehigh". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. 2007. p. 67. doi:10.1007/978-3-540-29925-7_692. ISBN 9783540299257.