16879 Campai

16879 Campai (provisional designation 1998 BH₁₀) is a stony Witt asteroid and slow rotator from the central region of the asteroid belt, approximately 10 kilometers (6 miles) in diameter. The S-type asteroid was discovered on 24 January 1998, by Italian astronomers Andrea Boattini and Maura Tombelli at the Pistoia Mountains Astronomical Observatory in San Marcello Pistoiese, Tuscany, central Italy.^[1] It was named for Italian amateur astronomer Paolo Campai.^[2]

16879 Campai

Discovery[1]
Discovered by	A. Boattini M. Tombelli
Discovery site	Pistoia Mountains Obs.
Discovery date	24 January 1998
Designations
MPC designation	(16879) Campai
Named after	Paolo Campai[2] (Italian amateur astronomer)
Alternative designations	1998 BH10
Minor planet category	main-belt[1][3] · (middle) Witt[4]
Orbital characteristics[3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc	39.78 yr (14,529 d)
Aphelion	2.8229 AU
Perihelion	2.6938 AU
Semi-major axis	2.7584 AU
Eccentricity	0.0234
Orbital period (sidereal)	4.58 yr (1,673 d)
Mean anomaly	349.41°
Mean motion	0° 12m 54.36s / day
Inclination	7.1221°
Longitude of ascending node	47.289°
Argument of perihelion	230.77°
Physical characteristics
Mean diameter	10.61 km (calculated)[5]
Synodic rotation period	314.2468±4.9149 h[6]
Geometric albedo	0.057 (assumed)[5]
Spectral type	S[7] · C (assumed)[5]
Absolute magnitude (H)	12.97±0.46[7] 13.150±0.005[6] 13.3[3] · 13.6[5]

Orbit and classification

Campai is a member of the Witt family (535),^[4] a large family of (predominantly) stony asteroids with more than 1,600 known members.^[8] It orbits the Sun in the central main-belt at a distance of 2.7–2.8 AU once every 4 years and 7 months (1,673 days; semi-major axis of 2.76 AU). Its orbit has an eccentricity of 0.02 and an inclination of 7° with respect to the ecliptic.^[3] The first precovery was obtained at Siding Spring Observatory in July 1977, extending the asteroid's observation arc by 22 years prior to its discovery.^[1]

Physical characteristics

Campai has been characterized as a common, stony S-type asteroid,^[5] in line with the overall spectral type for members of the Witt family.^[8]: 23

Slow rotator

In October 2010, a rotational lightcurve of Campai was obtained from photometric observations made at the Palomar Transient Factory in California. It rendered an exceptionally long period of 314.2468±4.9149 hours with a brightness amplitude of 0.68 magnitude (U=2).^[6] While the result is based on less than full coverage, and may be refined by future observations, Campai is one of the slowest rotating asteroids known to exist.

Diameter and albedo

The Collaborative Asteroid Lightcurve Link calculates a diameter of 10.5 kilometers with an absolute magnitude of 13.6 and an assumed standard albedo for a carbonaceous asteroid of 0.057.^[5]

Naming

This minor planet was named for Italian amateur astronomer Paolo Campai (born 1957) from Florence, who is specialized in teaching and astrophotography. Both discoverers made his acquaintance near Florence on a night in 1985, while observing comet 1P/Halley and α Phoenicis.^[2] The approved naming citation was published by the Minor Planet Center on 6 August 2003 (M.P.C. 49281).^[9]