12923 Zephyr
| Discovery[1] | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Discovered by | Lowell Observatory Near-Earth-Object Search | ||||||||
| Discovery site | Anderson Mesa Station, Flagstaff, Arizona | ||||||||
| Discovery date | 11 April 1999 | ||||||||
| Designations | |||||||||
| 12923 Zephyr | |||||||||
| 1999 GK4 | |||||||||
| Apollo asteroid | |||||||||
| Orbital characteristics[1] | |||||||||
| Epoch June 27, 2015 | |||||||||
| Aphelion | 2.9274 AU (437.93 Gm) | ||||||||
| Perihelion | 0.9968 AU (149.12 Gm) | ||||||||
| 1.9621 AU (293.53 Gm) | |||||||||
| Eccentricity | 0.49197 | ||||||||
| 2.75 yr (1003.9 days) | |||||||||
| 272.2531° | |||||||||
| Inclination | 5.3039° | ||||||||
| 168.2123° | |||||||||
| 147.069° | |||||||||
| Earth MOID | 0.02164 AU (3.237 Gm) | ||||||||
| Proper orbital elements[1][2] | |||||||||
Proper eccentricity | 0.49145 | ||||||||
Proper inclination | 5.2425° | ||||||||
Proper mean motion | 130.899 deg / yr | ||||||||
Proper orbital period | 2.75021 yr (1004.515 d) | ||||||||
| Physical characteristics | |||||||||
| Dimensions | 2.06 km (1.28 mi)[2] | ||||||||
| 3.891 hours[1] | |||||||||
| 0.176[2] | |||||||||
| |||||||||
| S[1][2] | |||||||||
| 15.8[1] | |||||||||
12923 Zephyr (1999 GK4) is an Apollo asteroid. Its name is derived from the ancient Greek god of the west wind Zephyrus and suggested by M. Smitherman.[1] This asteroid is classified as a PHA due to its low Earth MOID; however, the asteroid poses no threat within the next 100 years and is therefore not on the Sentry Risk Table.[4]
References
- ^ a b c d e f g 12923 Zephyr at the JPL Small-Body Database
- ^ a b c d "(12923) Zephyr". NEODyS. University of Pisa. Retrieved 29 November 2015.
- ^ "Planetary Habitability Calculators". Planetary Habitability Laboratory. University of Puerto Rico at Arecibo. Retrieved 29 November 2015.
- ^ "Sentry Risk Table". Near Earth Object Program. Jet Propulsion Laboratory. 29 November 2015. Retrieved 29 November 2015.
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