691 Lehigh

691 LehighDiscovery

Discovered by| Joel Hastings Metcalf
Discovery site| Taunton, Massachusetts
Discovery date| 11 December 1909
Designations

MPC designation

| (691) Lehigh
Pronunciation| /ˈliːhaɪ/[1]

Alternative designations

| 1909 JG
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc| 101.40 yr (37038 d)
|{{{apsis}}}|helion}}| 3.3787 astronomical unit|AU (505.45 Gm)
|{{{apsis}}}|helion}}| 2.6443 AU (395.58 Gm)

Semi-major axis

| 3.0115 AU (450.51 Gm)
Eccentricity| 0.12194
Orbital period| 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°

|{{{apsis}}}|helion}}

| 304.466°
Physical characteristics
Mean radius| 43.84±0.85 km
Rotation period| 12.891 h (0.5371 d)
Geometric albedo| 0.0438±0.002
Absolute magnitude (H)| 9.2

691 Lehigh is a minor planet (the earlier term for an asteroid) orbiting the Sun, discovered in 1909.[3] 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.

## References

1. ↑ Noah Webster (1884) A Practical Dictionary of the English Language
2. ↑ "691 Lehigh (1909 JG)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=691;cad=1.
3. ↑ "(691) Lehigh". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. 2007. pp. 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 )
* 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 diagram * Orbital elements * Physical parameters

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