Discovery[1] | |
---|---|
Discovered by | LONEOS |
Discovery site | Anderson Mesa Stn. |
Discovery date | 11 April 1999 |
Designations | |
(12923) Zephyr | |
Pronunciation | /ˈzɛfər/[2] |
Named after | Zephyrus[3] (Greek mythology) |
1999 GK4 | |
Orbital characteristics[1] | |
Epoch 4 September 2017 (JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 61.75 yr (22,554 days) |
Earliest precovery date | 21 April 1955 |
Aphelion | 2.9267 AU |
Perihelion | 0.9964 AU |
1.9615 AU | |
Eccentricity | 0.4920 |
2.75 yr (1,003 days) | |
199.23° | |
0° 21m 31.68s / day | |
Inclination | 5.3045° |
168.21° | |
147.06° | |
Earth MOID | 0.0211 AU (8.2 LD) |
Physical characteristics | |
3.891 h[a] | |
12923 Zephyr (prov. designation: 1999 GK4) is a stony asteroid, classified as potentially hazardous asteroid and near-Earth object of the Apollo group, approximately 2 kilometers (1.2 miles) in diameter. It was discovered on 11 April 1999, by astronomers of the Lowell Observatory Near-Earth Object Search at Anderson Mesa Station near Flagstaff, Arizona.[4] The asteroid was named after the deity Zephyrus from Greek mythology.[3]
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