astro.wikisort.org - Asteroid

1215 Boyer, provisional designation 1932 BA, is a stony Eunomian asteroid from the central region of the asteroid belt, approximately 20 kilometers in diameter. It was discovered by astronomer Alfred Schmitt in 1932, who named it after French astronomer and college Louis Boyer.[11]

1215 Boyer

Discovery[1]
Discovered by	A. Schmitt
Discovery site	Algiers Obs.
Discovery date	19 January 1932
Designations
MPC designation	(1215) Boyer
Named after	Louis Boyer (French astronomer)[2]
Alternative designations	1932 BA
Minor planet category	main-belt · (middle) Eunomia[3] · Maria[4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	85.46 yr (31,214 days)
Aphelion	2.9213 AU
Perihelion	2.2352 AU
Semi-major axis	2.5783 AU
Eccentricity	0.1331
Orbital period (sidereal)	4.14 yr (1,512 days)
Mean anomaly	324.91°
Mean motion	0° 14m 17.16s / day
Inclination	15.915°
Longitude of ascending node	123.74°
Argument of perihelion	266.02°
Physical characteristics
Dimensions	13.041±0.106 km[5] 14.705±0.091 km[6] 17.47 km (calculated)[3] 20.68±0.79 km[7] 23.06±4.95 km[8] 24.65±0.36 km[9]
Synodic rotation period	10.36±0.05 h[4]
Geometric albedo	0.116±0.022[9] 0.147±0.013[7] 0.17±0.08[8] 0.21 (assumed)[3] 0.3012±0.1397[6]
Spectral type	Tholen = S[1] · S[3] B–V = 0.900[1] U–B = 0.459[1]
Absolute magnitude (H)	11.00[8][9] 11.1[1][3][6] 11.14[7] 11.53±0.15[10]

Discovery

Boyer was discovered on 19 January 1932, by French astronomer Alfred Schmitt at the Algiers Observatory in Algeria, North Africa.[1] Eight days later, it was independently discovered by Karl Reinmuth at Heidelberg Observatory in Germany.[2] The body's observation arc begins at Algiers with its official discovery observation.[11]

Classification and orbit

Boyer is a member of the Eunomia family (502), the most prominent family in the intermediate main-belt, which mostly consists of stony asteroids. Conversely, Boyer has also been grouped into the Maria family (506).[4]

It orbits the Sun at a distance of 2.2–2.9 AU once every 4 years and 2 months (1,512 days). Its orbit has an eccentricity of 0.13 and an inclination of 16° with respect to the ecliptic.[1]

Physical characteristics

In the Tholen classification, Boyer is a common, stony S-type asteroid.[1]

Lightcurves

In August 2008 and May 2012, two rotational lightcurves of Boyer were obtained from photometric observations by an international collaboration of astronomers studying the rotational properties of Maria asteroids, using the ground-based Wise Observatory in Israel. Lightcurve analysis gave a rotation period of 10.36 hours with a brightness variation of 0.31 and 050 magnitude, respectively (U=2-/2).[4]

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, Boyer measures between 13.041 and 24.65 kilometers in diameter and its surface has an albedo between 0.116 and 0.3012.[5][6][7][8][9]

The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.21, derived from the Eunomia family's largest member and namesake, 15 Eunomia, and calculates a diameter of 17.47 kilometers with an absolute magnitude of 11.1.[3]

Naming

This minor planet was named by the discoverer after his colleague at Algiers Observatory, Louis Boyer (1901–1999), who worked extensively on asteroids and comets. Boyer himself was a discoverer of minor planets at Algiers. He later worked on identifications at Nice observatory.[2] The official naming citation was published by the Minor Planet Center on 1 August 1978 (M.P.C. 4418).[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 (1)-(5000) – Minor Planet Center
• 1215 Boyer at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 1215 Boyer at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (1215) Boyer

(1215) Boyer ist ein Asteroid des Hauptgürtels, der am 19. Januar 1932 vom französischen Astronomen Alfred Schmitt in Algier entdeckt wurde.

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- [en] 1215 Boyer

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[es] (1215) Boyer

(1215) Boyer es un asteroide que forma parte del cinturón de asteroides y fue descubierto por Alfred Schmitt el 19 de enero de 1932 desde el observatorio de Argel-Bouzaréah, Argelia.

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[ru] (1215) Бойер

(1215) Бойер (лат. Boyer) — типичный астероид главного пояса, который был обнаружен 19 января 1932 года французским астрономом Альфредом Шмитом, работавшим в Алжире. Астероид им был назван в честь выдающегося французского астронома Луи Буайе.

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