2829 Bobhope

2829 Bobhope (prov. designation: 1948 PK) is a dark asteroid of the Meliboea family, from the outer region of the asteroid belt. It was discovered on 9 August 1948, by South African astronomer Ernest Leonard Johnson at Union Observatory in Johannesburg.^[15] The asteroid was later named after comedian Bob Hope.^[2] The asteroid has a rotation period of 6.1 hours and measures approximately 37 kilometers (23 miles) in diameter.

2829 Bobhope

Shape model of Bobhope from its lightcurve
Discovery[1]
Discovered by	E. L. Johnson
Discovery site	Johannesburg Obs.
Discovery date	9 August 1948
Designations
MPC designation	(2829) Bobhope
Named after	Bob Hope (American actor; comedian)[2]
Alternative designations	1948 PK · 1942 JH 1952 DU2 · 1952 HR 1959 RV · 1972 YZ
Minor planet category	main-belt · (outer)[3] Meliboea[4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	68.64 yr (25,070 days)
Aphelion	3.6742 AU
Perihelion	2.5074 AU
Semi-major axis	3.0908 AU
Eccentricity	0.1888
Orbital period (sidereal)	5.43 yr (1,985 days)
Mean anomaly	272.56°
Mean motion	0° 10m 53.04s / day
Inclination	14.301°
Longitude of ascending node	324.06°
Argument of perihelion	339.21°
Physical characteristics
Mean diameter	32.14±9.31 km[5] 36.29±12.47 km[6] 38.25±2.4 km[7] 40.89±0.87 km[8] 40.98±0.54 km[9] 41.361±0.224 km[10] 44.804±0.511 km[11]
Synodic rotation period	5.013±0.003 h[12] 6.0888±0.0007 h[13]
Geometric albedo	0.05±0.03[6] 0.055±0.010[10][8] 0.06±0.05[5] 0.0668±0.0182[11] 0.080±0.003[9] 0.0916±0.013[7]
Spectral type	C[3]
Absolute magnitude (H)	10.3[7][9][11] · 10.70[5][8] · 10.8[1][3] · 10.95±0.48[14] · 11.12[6]

Orbit and classification

Bobhope is a member of the Meliboea family,^[4] a smaller asteroid family of carbonaceous outer-belt asteroids with a few hundred members, named after 137 Meliboea.^[16]: 23 It orbits the Sun in the outer main-belt at a distance of 2.5–3.7 AU once every 5 years and 5 months (1,985 days). Its orbit has an eccentricity of 0.19 and an inclination of 14° with respect to the ecliptic.^[1] It was first observed as 1942 JH at the discovering observatory in May 1942, yet the astrometric data from this observation remained unused to extend its observation arc prior to the official discovery date.^[15]

Naming

This minor planet was named for English-born, American comedian Bob Hope (1903–2003), star of innumerable feature film, theater, TV and radio productions, and known for the horror comedy Cat and the Canary (1939).^[2] He hosted the Academy Awards more than any other host, and received several Honorary and Special Oscars himself. Hope also received more than forty honorary doctorates.^[2] The naming was published by the Minor Planet Center on 1 September 1993 (M.P.C. 22496).^[17]

Physical characteristics

Bobhope has been characterized as a carbonaceous C-type asteroid,^[3] which agrees with the overall spectral type of the Meliboea family.^[16]: 23

Rotation period

A rotational lightcurve of Bobhope was obtained from photometric observations by astronomer Landy Carbo at Oakley Southern Sky Observatory (E09), Australia, and at the U.S. Oakley Observatory in September 2008. It gave it a rotation period of 5.013±0.003 hours with a brightness variation of 0.46±0.08 magnitude (U=2).^[12] A previously published lightcurve by French amateur astronomer Bernard Christophe gave a somewhat longer period of 6.0888±0.0007 hours with an amplitude of 0.50 (U=2).^[13]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Bobhope measures between 32.14 and 40.98 kilometers in diameter and its surface has an albedo between 0.05 and 0.0916.^{[5][6][7][8][9]} More dated NEOWISE publications gave a larger diameter of 41.361 and 44.8 kilometers, respectively.^[10][11] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0586 and a diameter of 38.0 kilometers with an absolute magnitude of 10.8.^[3]