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5430 Luu, provisional designation 1988 JA1, is a stony Phocaea asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 12 May 1988, by American astronomer couple Carolyn and Eugene Shoemaker at Palomar Observatory, California, and later named after astronomer Jane Luu.[2][12]
| Discovery [1] | |
|---|---|
| Discovered by | C. Shoemaker E. M. Shoemaker |
| Discovery site | Palomar Obs. |
| Discovery date | 12 May 1988 |
| Designations | |
| (5430) Luu | |
Named after | Jane Luu (American astronomer)[2] |
| 1988 JA1 · 1970 OL | |
| main-belt · Phocaea [3][4] | |
| Orbital characteristics [1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 46.86 yr (17,114 days) |
| Aphelion | 2.8929 AU |
| Perihelion | 1.8356 AU |
| 2.3642 AU | |
| Eccentricity | 0.2236 |
| 3.64 yr (1,328 days) | |
| 20.073° | |
| 0° 16m 15.96s / day | |
| Inclination | 23.894° |
| 123.00° | |
| 122.11° | |
| Physical characteristics | |
| Dimensions | 6.508±0.029 km[5] 6.659±0.043[6] 7.63 km (calculated)[3] 8.05±0.22 km[7] 8.27±0.25 km[8] |
| 4.44±0.05 h[9] 13.55±0.02 h[10] | |
| 0.212±0.012[7] 0.215±0.036[8][6] 0.23 (assumed)[3] 0.3826±0.0839[5] | |
| S [3] | |
| 12.6[5] · 12.70[8] · 12.8[1][3][7] · 13.45±0.87[11] | |
Luu is a member of the Phocaea family (701).[4] It orbits the Sun in the inner main-belt at a distance of 1.8–2.9 AU once every 3 years and 8 months (1,328 days). Its orbit has an eccentricity of 0.22 and an inclination of 24° with respect to the ecliptic.[1] The first precovery was taken at Crimea–Nauchnij in 1970, extending the asteroid's observation arc by 18 years prior to its discovery.[12]
Luu has been characterized as a common S-type asteroid.[3]
Rotation period
In April 2006, photometric observations of Luu collected by American astronomer Brian D. Warner at his Palmer Divide Station, Colorado, show a rotation period of 13.55±0.02 hours with a brightness variation of 0.06±0.02 magnitude (U=2).[10] A second, tentative lightcurve was obtained by French astronomer René Roy in July 2007. It gave a period of 4.44±0.05 hours and an amplitude of 0.05 in magnitude (U=2-).[9]
Diameter and albedo
According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Luu measures 6.5 and 8.3 kilometers in diameter and its surface has an albedo between 0.21 and 0.26.[5][6][7][8]
The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.23 – derived from 25 Phocaea, the family's most massive member and namesake – and calculates a diameter of 7.6 kilometers with an absolute magnitude of 12.8.[3]
This minor planet is named in honor of Vietnamese-American astronomer Jane X. Luu (born 1963) for her research and discovering the first and subsequent members of the Kuiper Belt.[13] She also studied the physical properties of these bodies and the coma of potentially Extinct comets.[2] The approved naming citation was published by the Minor Planet Center on 1 July 1996 (M.P.C. 27459).[14]
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