1999 LE31
| 300px
Diagram of the orbit of 1999 LE31
|
|
| Discovery | |
|---|---|
| Discovered by | Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro |
| Discovery date | June 12, 1999 |
| Designations | |
| damocloid | |
| Orbital characteristics[2] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 3 | |
| Observation arc | 409 days (1.12 yr) |
| Aphelion | 11.939 AU (1.7860 Tm) |
| Perihelion | 4.3386 AU (649.05 Gm) |
| 8.1385 AU (1.21750 Tm) | |
| Eccentricity | 0.46691 |
| 23.22 yr (8480.41 d) | |
| 266.052° | |
| Inclination | 151.812° (retrograde) |
| 292.018° | |
| 32.5005°[1] | |
| Earth MOID | 3.35736 AU (502.254 Gm) |
| Jupiter MOID | 0.527518 AU (78.9156 Gm) |
| Physical characteristics | |
| Dimensions | 16.8 km[2] |
|
Mean radius
|
8.4 ± 2.1 km |
| 0.056 ± 0.026[2] | |
| 12.4[2] | |
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1999 LE31 is a damocloid centaur[2] discovered on June 12, 1999.[3] It is both a Jupiter and Saturn-crossing minor planet.[2]
1999 LE31 spends most of its orbit located in the outer Solar System between Jupiter and Uranus,[4] and like all centaurs, has an unstable orbit caused by the gravitational influence of the giant planets. Due to this, it must have originated from elsewhere, most likely outside Neptune.[4]
Of over half a million known minor planets, 1999 LE31 is one of about 60 that has a retrograde orbit.[5]
1999 LE31 is approximately 16.8 km in diameter.[2][3] It came to perihelion (closest approach to the Sun) in December 1998.[6] It was last observed in 2000, and will next come to perihelion in February 2022.[2]
Observations
This asteroid has been recorded at such observatories as:[1]
- Lincoln Laboratory (1.0-m f/2.15 reflector + CCD) - location of discovery
- Dominion Astrophysical Observatory (1.82-m reflector + CCD)
- Dynic Astronomical Observatory (0.60-m f/3.7 reflector + CCD)
- European Northern Observatory (1.0-m reflector + CCD)
- Farpoint (0.30-m Schmidt-Cassegrain + CCD)
- Kleť Observatory (0.57-m f/5.2 reflector + CCD)
- McDonald Observatory (0.76-m reflector + CCD)
- Roque de los Muchachos Observatory (1.0-m reflector + CCD)
See also
- 20461 Dioretsa a.k.a. 1999 LD31
- 2000 DG8
- List of notable asteroids
References
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<references />, or <references group="..." />External links
- Interactive orbit diagram
- Yanga R. Fernández, David C. Jewitt, and Scott S. Sheppard, Low Albedos Among Extinct Comet Candidates, May 22, 2001
- 1999 LE31 – Seiichi Yoshida @ aerith.net
- 1999 LE31 at the JPL Small-Body Database
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