5430 Luu

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]

5430 Luu

Discovery[1]
Discovered by	C. Shoemaker E. M. Shoemaker
Discovery site	Palomar Obs.
Discovery date	12 May 1988
Designations
MPC designation	(5430) Luu
Named after	Jane Luu (American astronomer)[2]
Alternative designations	1988 JA1 · 1970 OL
Minor planet category	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
Semi-major axis	2.3642 AU
Eccentricity	0.2236
Orbital period (sidereal)	3.64 yr (1,328 days)
Mean anomaly	20.073°
Mean motion	0° 16m 15.96s / day
Inclination	23.894°
Longitude of ascending node	123.00°
Argument of perihelion	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]
Synodic rotation period	4.44±0.05 h[9] 13.55±0.02 h[10]
Geometric albedo	0.212±0.012[7] 0.215±0.036[8][6] 0.23 (assumed)[3] 0.3826±0.0839[5]
Spectral type	S[3]
Absolute magnitude (H)	12.6[5] · 12.70[8] · 12.8[1][3][7] · 13.45±0.87[11]

Orbit and classification

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]

Physical characteristics

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]

Naming

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]