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691 Lehigh

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691 Lehigh
Discovery
Discovered byJoel Hastings Metcalf
Discovery siteTaunton, Massachusetts
Discovery date11 December 1909
Designations
(691) Lehigh
Pronunciation/ˈlh/[1]
1909 JG
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc101.40 yr (37038 d)
Aphelion3.3787 AU (505.45 Gm)
Perihelion2.6443 AU (395.58 Gm)
3.0115 AU (450.51 Gm)
Eccentricity0.12194
5.23 yr (1908.9 d)
189.349°
0° 11m 18.924s / day
Inclination13.010°
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]
  1. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  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.
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