8116 Jeanperrin

8116 Jeanperrin, provisional designation 1996 HA₁₅, is a Florian asteroid and synchronous binary system from the inner regions of the asteroid belt, approximately 4.8 kilometers (3 miles) in diameter. It was discovered on 17 April 1996, by Belgian astronomer Eric Elst at the La Silla Observatory in northern Chile.^[1] The likely stony S-type asteroid has a rotation period of 3.62 hours and a nearly round shape.^[4] It was named for French physicist and Nobel laureate Jean Baptiste Perrin.^[1] A minor-planet moon, a third the size of its primary, was discovered in 2007.^[5][6]

Jeanperrin is a member of the Flora family (402),^[3] a giant asteroid family and the largest family of stony asteroids in the main-belt.^[4][13]

It orbits the Sun in the inner asteroid belt at a distance of 1.9–2.6 AU once every 3 years and 4 months (1,233 days; semi-major axis of 2.25 AU). Its orbit has an eccentricity of 0.16 and an inclination of 5° with respect to the ecliptic.^[2] The body's observation arc begins with its first observations as 1987 WU₃ at Anderson Mesa Station in November 1987, more than 8 years prior to its official discovery observation at La Silla.^[1]

Jeanperrin is an assumed S-type asteroid,^[4] which agrees with the overall spectral type for member of the Flora family.^[13]: 23

In October 2007, a rotational lightcurve of Jeanperrin was obtained from photometric observations by a large international collaboration of astronomers. Lightcurve analysis gave a rotation period of 3.6169 hours and a low brightness variation of 0.09 magnitude, indicative of a nearly spheroidal shape (U=3).^[6] Additional observations by Petr Pravec at Ondřejov Observatory in 2007 and 2017, rendered a nearly identical period of 3.6169 and 3.61692 hours with an amplitude of 0.09 and 0.10 magnitude, respectively (U=3/3).^[a][b]

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Jeanperrin measures between 3.66 and 4.797 kilometers in diameter and its surface has an albedo between 0.1841 and 0.437.^{[7][8][9][10][11]}

The Collaborative Asteroid Lightcurve Link adopts Petr Pravec's revised WISE data, that is, an albedo of 0.1841 and a (rounded) diameter of 4.80 kilometers based on an absolute magnitude of 14.05.^[4]

During the photometric observations in October 2007 (see above), it was also revealed, that Jeanperrin is a synchronous binary asteroid with a minor-planet moon in its orbit. The satellite measures approximately 1.49 kilometers in diameter (d_s/d_p-ratio of at least 0.33), and orbits its primary at an estimated average distance of 13 kilometers once every 36.15 hours (1.506 days).^[5][6]

This minor planet was named after French physicist Jean Baptiste Perrin (1870–1942), who was awarded the 1926 Nobel Prize in Physics for his studies of Brownian motion (also see list of laureates).^[1] The official naming citation was published by the Minor Planet Center on 11 February 1998 (M.P.C. 31299).^[14]

• Asteroids with Satellites, Robert Johnston, johnstonsarchive.net
• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
• 8116 Jeanperrin at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 8116 Jeanperrin at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters