9223 Leifandersson
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| Discovery[1] | |
|---|---|
| Discovered by | Spacewatch |
| Discovery site | Kitt Peak National Obs. |
| Discovery date | 18 December 1995 |
| Designations | |
| (9223) Leifandersson | |
Named after | Leif Erland Andersson[2][3] (Swedish astronomer) |
| 1995 YY7 · 1949 QK1 1981 UD5 · 1988 VT10 1990 FD4 · 1991 RK | |
| main-belt · Flora[4] background[5][6] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 67.50 yr (24,655 days) |
| Aphelion | 2.4626 AU |
| Perihelion | 2.1386 AU |
| 2.3006 AU | |
| Eccentricity | 0.0704 |
| 3.49 yr (1,275 days) | |
| 245.38° | |
| 0° 16m 57s / day | |
| Inclination | 3.4120° |
| 231.82° | |
| 23.837° | |
| Physical characteristics | |
| Dimensions | 4.498±0.176 km[7][8] 4.64 km (calculated)[4] |
| 3.758±0.0014 h[9] | |
| 0.24 (assumed)[4] 0.381±0.051[7] 0.3810±0.0513[8] | |
| S (assumed)[4] | |
| 13.384±0.003 (R)[9] · 13.4[8] · 13.6[1] · 13.83[4] | |
9223 Leifandersson, provisional designation 1995 YY7, is a background asteroid from the inner regions of the asteroid belt, approximately 4.5 kilometers in diameter. It was discovered on 18 December 1995, by astronomers of the Spacewatch program at Kitt Peak National Observatory in Arizona, United States. The asteroid was named in memory of Swedish astronomer Leif Erland Andersson.[2] The assumed stony asteroid has a rotation period of 3.758 hours.[4]
Leifandersson is a non-family asteroid of the main belt's background population when applying the Hierarchical Clustering Method to its proper orbital elements.[5][6] It has also been classified as a member of the Flora family (402), a giant asteroid family and the largest family of stony asteroids in the main-belt.[4] It orbits the Sun in the inner asteroid belt at a distance of 2.1–2.5 AU once every 3 years and 6 months (1,275 days; semi-major axis of 2.30 AU). Its orbit has an eccentricity of 0.07 and an inclination of 3° with respect to the ecliptic.[1]
The body's observation arc begins with its first observation as 1949 QK1 at Goethe Link Observatory in August 1948, or more than 47 years prior to its official discovery observation at Kitt Peak.[2]
Physical characteristics
Leifandersson is an assumed stony S-type asteroid.[4]
Rotation period
In February 2011, a rotational lightcurve of Leifandersson was obtained from photometric observations by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 3.758 hours with a brightness amplitude of 0.33 magnitude (U=2).[9]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Leifandersson measures 4.498 kilometers in diameter and its surface has an albedo of 0.3810.[7][8] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the parent body of the Flora family – and calculates a diameter of 4.64 kilometers based on an absolute magnitude of 13.83.[4]
