(164121) 2003 YT1
(164121) 2003 YT1, provisional designation 2003 YT1, is a bright asteroid and synchronous binary system on a highly eccentric orbit, classified as near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 2 kilometers (1.2 miles) in diameter. It was discovered on 18 December 2003, by astronomers with the Catalina Sky Survey at the Catalina Station near Tucson, Arizona, in the United States. The V-type asteroid has a short rotation period of 2.3 hours. Its 210-meter sized minor-planet moon was discovered at Arecibo Observatory in May 2004.
Mosaic of radar images of 2003 YT1 and its moon by Arecibo Observatory on 4 May 2004 | |
| Discovery | |
|---|---|
| Discovered by | Catalina Sky Srvy. |
| Discovery site | Catalina Stn. |
| Discovery date | 18 December 2003 |
| Designations | |
MPC designation | (164121) 2003 YT1 |
Alternative designations | 2003 YT1 |
Minor planet category | Apollo · NEO · PHA |
| Orbital characteristics | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 35.41 yr (12,934 d) |
| Aphelion | 1.4335 AU |
| Perihelion | 0.7857 AU |
Semi-major axis | 1.1096 AU |
| Eccentricity | 0.2919 |
Orbital period (sidereal) | 1.17 yr (427 d) |
Mean anomaly | 11.417° |
Mean motion | 0° 50m 35.88s / day |
| Inclination | 44.064° |
Longitude of ascending node | 38.335° |
| 91.042° | |
| Known satellites | 1 (D: 210 m; P: 30 h) |
| Earth MOID | 0.0027 AU (1.0519 LD) |
| Physical characteristics | |
Mean diameter | 1.0 km 1.100±0.088 km 1.561±0.202 km 1.717±0.550 km |
Synodic rotation period | 2.34 h 2.343 h 2.343 h 3.0025±0.0001 h |
| 0.198±0.153 0.240±0.067 0.36±0.20 0.486±0.040 0.4861±0.0395 0.5848 (derived) | |
| V | |
| 16.2 16.20±0.3 | |
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