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 | |||||||||
| MPC designation | 12923 Zephyr | ||||||||
| 1999 GK4 | |||||||||
| Apollo asteroid | |||||||||
| Orbital characteristics[1] | |||||||||
| Epoch 13 January 2016 (JD 2457400.5) | |||||||||
| Uncertainty parameter 0 | |||||||||
| Observation arc | 21954 days (60.11 yr) | ||||||||
| Aphelion | 2.9270 AU (437.87 Gm) | ||||||||
| Perihelion | 0.99655 AU (149.082 Gm) | ||||||||
| 1.9618 AU (293.48 Gm) | |||||||||
| Eccentricity | 0.49202 | ||||||||
| 2.75 yr (1003.6 d) | |||||||||
| 343.9508° | |||||||||
| 0° 21m 31.316s / day | |||||||||
| Inclination | 5.3044° | ||||||||
| 168.2135° | |||||||||
| 147.088° | |||||||||
| Earth MOID | 0.0204477 AU (3.05893 Gm) | ||||||||
| Jupiter MOID | 2.39879 AU (358.854 Gm) | ||||||||
| Jupiter Tisserand parameter | 3.717 | ||||||||
| 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 h (0.1621 d) | |||||||||
Sidereal rotation period | 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
- 1 2 3 4 5 6 7 "12923 Zephyr". JPL Small-Body Database. Jet Propulsion Laboratory. SPK-ID: 12923. Retrieved 9 April 2016.
- 1 2 3 4 "(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.
External links
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