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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 byE. Delporte
Discovery siteUccle Obs.
Discovery date18 August 1933
MPC designation(1280) Baillauda
Named after
Jules Baillaud[2]
(French astronomer)
1933 QB · 1931 HE
1946 SF · 1959 UK
1961 AN · A912 GB
main-belt · (outer)[3]
background [4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc84.12 yr (30,725 days)
Aphelion3.5842 AU
Perihelion3.2431 AU
3.4136 AU
6.31 yr (2,304 days)
0° 9m 22.68s / day
Physical characteristics
Dimensions50.83±2.0 km[3][5]
53.97±0.72 km[6]
12.6 h[7]
Tholen = X[1]
P (derived from Tholen)[3]
B–V = 0.671[1]
U–B = 0.360[1]
9.99±0.22[8] · 10.33[1][3][5][6]


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 classificationEdit

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 characteristicsEdit

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 periodEdit

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 albedoEdit

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]


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]


  1. ^ a b c d e f g h "JPL Small-Body Database Browser: 1280 Baillauda (1933 QB)" (2017-10-01 last obs.). Jet Propulsion Laboratory. Retrieved 7 November 2017.
  2. ^ a b c d Schmadel, Lutz D. (2007). "(1280) Baillauda". Dictionary of Minor Planet Names – (1280) Baillauda. Springer Berlin Heidelberg. p. 105. doi:10.1007/978-3-540-29925-7_1281. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f g "LCDB Data for (1280) Baillauda". Asteroid Lightcurve Database (LCDB). Retrieved 7 November 2017.
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 7 November 2017.
  5. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Archived from the original on 2016-06-03. Retrieved 7 November 2017.
  6. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 7 November 2017.
  7. ^ a b Lagerkvist, C.-I.; Erikson, A.; Debehogne, H.; Festin, L.; Magnusson, P.; Mottola, S.; et al. (October 1995). "Physical studies of asteroids. XXIX. Photometry and analysis of 27 asteroids". Astronomy and Astrophysics Supplement. 113: 115. Bibcode:1995A&AS..113..115L. Retrieved 7 November 2017.
  8. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 7 November 2017.
  9. ^ a b c d "1280 Baillauda (1933 QB)". Minor Planet Center. Retrieved 7 November 2017.

External linksEdit