astro.wikisort.org - Asteroid

52266 Van Flandern, provisional designation 1986 AD, is a stony Phocaea asteroid from the inner regions of the asteroid belt, approximately 4 kilometers in diameter. It was discovered on 10 January 1986, by American astronomers Carolyn and Eugene Shoemaker at the Palomar Observatory in California, United States. The asteroid was later named for American astronomer Tom Van Flandern.[2]

52266 Van Flandern

Discovery [1]
Discovered by	C. S. Shoemaker E. M. Shoemaker
Discovery site	Palomar Obs.
Discovery date	10 January 1986
Designations
MPC designation	(52266) Van Flandern
Named after	Tom Van Flandern (American astronomer)[2]
Alternative designations	1986 AD · 1975 CJ 1998 QX81 · 2002 QQ
Minor planet category	main-belt · Phocaea [3][4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	41.88 yr (15,298 days)
Aphelion	2.8486 AU
Perihelion	1.8213 AU
Semi-major axis	2.3349 AU
Eccentricity	0.2200
Orbital period (sidereal)	3.57 yr (1,303 days)
Mean anomaly	275.98°
Mean motion	0° 16m 34.32s / day
Inclination	23.707°
Longitude of ascending node	302.17°
Argument of perihelion	229.79°
Physical characteristics
Dimensions	3.47±0.47 km[5] 4.42±0.83 km[6] 4.60 km (calculated)[3]
Synodic rotation period	9.65±0.06 h[7] 9.8816±0.0076 h[8] 9.89±0.01 h[9] 9.890±0.003 h[10]
Geometric albedo	0.23 (assumed)[3] 0.249±0.163[6] 0.30±0.09[5]
Spectral type	S [3][11]
Absolute magnitude (H)	13.9[1][3][6] · 13.908±0.002 (R)[8] · 14.10±0.23[11] · 14.31[5]

Orbit and classification

Van Flandern is a member of the Phocaea family (701),[4] a family of stony asteroids with similar orbital characteristics. It orbits the Sun in the inner main-belt at a distance of 1.8–2.8 AU once every 3 years and 7 months (1,303 days). Its orbit has an eccentricity of 0.22 and an inclination of 24° with respect to the ecliptic.[1] The asteroid's observation arc begins 11 years prior to its official discovery observation, with its identification as 1975 CJ at the Karl Schwarzschild Observatory in February 1975.[2]

Physical characteristics

Van Flandern has been characterized as a common S-type asteroid by Pan-STARRS photometric survey.[11]

Lightcurves

In January and February 2011, four rotational lightcurves of Van Flandern were obtained from photometric observations at the Via Capote Observatory (G69), the Palomar Transient Factory, and the Australian Oakley Southern Sky Observatory (E09), as well as by astronomer René Roy at his Blauvac Observatory (627) in France. Lightcurve analysis gave a well-defined rotation period between 9.65 and 9.89 hours with a brightness variation between 0.52 and 0.61 magnitude (U=3/2/3/2+).[7][8][9][10]

Diameter and albedo

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Van Flandern measures 3.47 and 4.42 kilometers in diameter and its surface has an albedo of 0.30 and 0.249, respectively.[5][6]

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 4.6 kilometers with an absolute magnitude of 13.9.[1]

Naming

This minor planet was named in memory of American astronomer Tom Van Flandern (1940–2009), expert in lunar occultations and on the dynamics of binary minor planets at USNO in the 1970s.[2]

Van Flandern also participated in the refinement of the Global Positioning System and published the Meta Research Bulletin for non-mainstream views on cosmology.[2] The approved naming citation was published by the Minor Planet Center on 9 February 2009 (M.P.C. 65123).[12]

References

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (50001)-(55000) – Minor Planet Center
• 52266 Van Flandern at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 52266 Van Flandern at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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