1295 Deflotte

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1295 Deflotte
Discovered byL. Boyer
Discovery siteAlgiers Obs.
Discovery date25 November 1933
(1295) Deflotte
Named after
(discoverer's nephew)
1933 WD · 1932 RE
1938 QF · 1939 VN
1941 CE · 1947 CA
1951 TV · 1963 TU
main-belt · (outer)[1][3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc83.61 yr (30,538 days)
Aphelion3.8043 AU
Perihelion2.9788 AU
3.3916 AU
6.25 yr (2,281 days)
0° 9m 28.08s / day
Physical characteristics
Dimensions45.67±1.36 km[4]
47.407±0.221 km[5]
47.99 km (derived)[3]
48.03±1.8 km[6]
48.68±16.05 km[7]
49.07±18.00 km[8]
51.048±0.525 km[9]
14.64±0.05 h[10]
0.0402 (derived)[3]
10.60[4][6][9] · 10.70[1][3][7] · 10.84±0.20[11] · 10.93[8]

1295 Deflotte, provisional designation 1933 WD, is a carbonaceous asteroid from the outer regions of the asteroid belt, approximately 48 kilometers in diameter. It was discovered on 25 November 1933, by French astronomer Louis Boyer at the Algiers Observatory in Algeria, North Africa.[12] The asteroid was named after the discoverer's nephew.[2]

Orbit and classification[edit]

Deflotte is a non-family asteroid from the main belt's background population. It orbits the Sun in the outer main-belt at a distance of 3.0–3.8 AU once every 6 years and 3 months (2,281 days). Its orbit has an eccentricity of 0.12 and an inclination of 3° with respect to the ecliptic.[1]

The asteroid was first identified as 1932 RE at Heidelberg Observatory in September 1932. The body's observation arc begins with its official discovery observation at Algiers in November 1933.[12]

Physical characteristics[edit]

Deflotte is an assumed carbonaceous C-type asteroid.[3]

Rotation period[edit]

In September 2007, a rotational lightcurve of Deflotte was obtained from photometric observations by French amateur astronomer René Roy. Lightcurve analysis gave a rotation period of 14.64 hours with a brightness amplitude of 0.16 magnitude (U=2).[10]

Diameter and albedo[edit]

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Deflotte measures between 45.67 and 51.048 kilometers in diameter and its surface has an albedo between 0.0390 and 0.049.[4][5][6][7][8][9] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0402 and a diameter of 47.99 kilometers based on an absolute magnitude of 10.7.[3]


This minor planet was named after Louis Boyer's nephew. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 118).[2]


  1. ^ a b c d e "JPL Small-Body Database Browser: 1295 Deflotte (1933 WD)" (2017-07-05 last obs.). Jet Propulsion Laboratory. Retrieved 14 September 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(1295) Deflotte". Dictionary of Minor Planet Names – (1295) Deflotte. Springer Berlin Heidelberg. p. 106. doi:10.1007/978-3-540-29925-7_1296. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f g "LCDB Data for (1295) Deflotte". Asteroid Lightcurve Database (LCDB). Retrieved 14 September 2017.
  4. ^ 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. (online, AcuA catalog p. 153)
  5. ^ a b c Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 14 September 2017.
  6. ^ 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. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
  7. ^ a b c d Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 14 September 2017.
  8. ^ a b c d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 14 September 2017.
  9. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
  10. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1295) Deflotte". Geneva Observatory. Retrieved 14 September 2017.
  11. ^ 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 14 September 2017.
  12. ^ a b "1295 Deflotte (1933 WD)". Minor Planet Center. Retrieved 14 September 2017.

External links[edit]