astro.wikisort.org - Asteroid

1280 Baillauda, provisional designation 1933 QB, is a dark background asteroid from the outermost region of the asteroid belt, approximately 52 kilometers in diameter. Discovered by Eugène Delporte at Uccle Observatory in 1933, the asteroid was named after French astronomer Jules Baillaud.[9]

1280 Baillauda

Discovery[1]
Discovered by	E. Delporte
Discovery site	Uccle Obs.
Discovery date	18 August 1933
Designations
MPC designation	(1280) Baillauda
Named after	Jules Baillaud[2] (French astronomer)
Alternative designations	1933 QB · 1931 HE 1946 SF · 1959 UK 1961 AN · A912 GB
Minor planet category	main-belt · (outer)[3] background[4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	84.12 yr (30,725 days)
Aphelion	3.5842 AU
Perihelion	3.2431 AU
Semi-major axis	3.4136 AU
Eccentricity	0.0500
Orbital period (sidereal)	6.31 yr (2,304 days)
Mean anomaly	61.729°
Mean motion	0° 9m 22.68s / day
Inclination	6.4598°
Longitude of ascending node	293.06°
Argument of perihelion	98.986°
Physical characteristics
Dimensions	50.83±2.0 km[3][5] 53.97±0.72 km[6]
Synodic rotation period	12.6 h[7]
Geometric albedo	0.045±0.001[6] 0.0505±0.004[3][5]
Spectral type	Tholen = X[1] P (derived from Tholen)[3] B–V = 0.671[1] U–B = 0.360[1]
Absolute magnitude (H)	9.99±0.22[8] · 10.33[1][3][5][6]

Discovery

Baillauda was discovered by Belgian astronomer Eugène Delporte at the Royal Observatory of Belgium in Uccle on 18 August 1933.[9] On the following night, it was independently discovered by Soviet astronomer Grigory Neujmin at Simeiz Observatory on the Crimean peninsula.[2] The Minor Planet Center only recognizes the first discoverer.[9]

The asteroid was first identified as A912 GB at Heidelberg Observatory in April 1912. The body's observation arc begins with its official discovery observation at Uccle in August 1933.[9]

Orbit and classification

Baillauda is a non-family asteroid from the main belt's background population.[4] It orbits the Sun in the outer asteroid belt at a distance of 3.2–3.6 AU once every 6 years and 4 months (2,304 days; semi-major axis of 3.41). Its orbit has an eccentricity of 0.05 and an inclination of 6° with respect to the ecliptic.[1]

Physical characteristics

In the Tholen classification, Baillauda is an X-type asteroid.[1] The Lightcurve Data Base amends this Tholen spectral type and derives a primitive P-type based on the asteroid's low albedo (see below).[3]

Rotation period

In August 1990, a rotational lightcurve of Baillauda was obtained from photometric observations by Swedish astronomer Claes-Ingvar Lagerkvist in a collaboration with other European astronomers. The observations were taken with the 1.5-meter telescope at the Loiano Observatory in Italy (598). Lightcurve analysis gave a rotation period of 12.6 hours with a brightness amplitude of 0.25 magnitude (U=2).[7]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS and the Japanese Akari satellite, Baillauda measures 50.83 and 53.97 kilometers in diameter and its surface has an albedo of 0.0505 and 0.045, respectively.[5][6] The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is an albedo of 0.0505 and a diameter of 50.83 kilometers based on an absolute magnitude of 10.33.[3]

Naming

This minor planet was named after French astronomer Jules Baillaud (1876–1960), who led the Pic du Midi Observatory in the French Pyrenees (1937–1947), after his stay at the observatories at Paris and Lyons (513).[2] Jules was the son of prolific astronomer Benjamin Baillaud (1848–1934), after whom the lunar crater Baillaud was named.

The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 117).[2]

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
• 1280 Baillauda at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 1280 Baillauda at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (1280) Baillauda

(1280) Baillauda ist ein Asteroid des Hauptgürtels, der am 18. August 1933 vom belgischen Astronomen Eugène Joseph Delporte in Ukkel entdeckt wurde.

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- [en] 1280 Baillauda

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