3893 DeLaeter

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3893 DeLaeter
Discovery [1]
Discovered by M. P. Candy
Discovery site Perth Obs.
Discovery date 20 March 1980
MPC designation (3893) DeLaeter
Named after
John Robert de Laeter[2]
(Australian scientist)
1980 FG12 · 1977 SX2
1984 KE
main-belt · Phocaea[3]
Hungaria  · background [4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 39.52 yr (14,435 days)
Aphelion 3.0626 AU
Perihelion 1.7817 AU
2.4221 AU
Eccentricity 0.2644
3.77 yr (1,377 days)
0° 15m 41.4s / day
Inclination 23.080°
Physical characteristics
Dimensions 10.97±1.24 km[5]
11.38±3.31 km[6]
12.12±0.17 km[7]
12.786±0.102 km[8]
12.935±0.100 km[9]
13.95 km (calculated)[3]
5.633±0.003 h[a]
13.83±0.01 h[10]
S (assumed)[3]
13.0[3][9] · 13.10[6] · 13.2[1] · 13.30[7] · 13.31[5] · 13.37±0.24[11]

3893 DeLaeter, provisional designation 1980 FG12, is an asteroid from the inner regions of the asteroid belt, approximately 12 kilometers in diameter. It was discovered on 20 March 1980, by British astronomer Michael Candy at the Perth Observatory in Bickley, Australia.[12] The asteroid was named after Australian scientist John Robert de Laeter.[2]

Orbit and classification[edit]

DeLaeter is a non-family asteroid of the main belt's background population when applying the Hierarchical Clustering Method to its proper orbital elements.[4] The asteroid has also been considered a dynamical Hungaria asteroid and a member of the stony Phocaea family.[3][10] It orbits the Sun in the inner main-belt at a distance of 1.8–3.1 AU once every 3 years and 9 months (1,377 days; semi-major axis of 2.42 AU). Its orbit has an eccentricity of 0.26 and an inclination of 23° with respect to the ecliptic.[1]

The asteroid was first identified as 1977 SX2 at Crimea–Nauchnij in September 1977. The body's observation arc begins with a precovery taken at Palomar Observatory in October 1977, or two and a half years prior to its official discovery observation at Bickley.[12]

Physical characteristics[edit]

DeLaeter is an assumed S-type asteroid,[3] which contradicts the low albedo measured by the space-based surveys (see below).

Rotation period[edit]

Photometric observations made by American astronomer Robert Stephens in June 2003 at the Santana Observatory (646) in Rancho Cucamonga, California, gave a synodic rotation period of 13.83 hours and a brightness variation of 0.33 magnitude (U=2).[10] In May 2014, a lightcurve obtained by Brian Warner at the Palmer Divide Station (U82) gave a divergent period of 5.633 hours with an amplitude of 0.13 (U=2).[a]

Diameter and albedo[edit]

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, DeLaeter measures between 10.97 and 12.935 kilometers in diameter and its surface has an albedo between 0.0573 and 0.08.[5][6][7][8][9]

The Collaborative Asteroid Lightcurve Link adopts an albedo of 0.0573 and calculates a diameter of 13.95 kilometers based on an absolute magnitude of 13.0.[3]


This minor planet was named after Australian scientist John Robert de Laeter (1933–2010), who was a professor at Curtin University in Western Australia. His research included pioneering application of mass spectrometry and problems in the field of nuclear physics, cosmochemistry, geochronology, isotope geochemistry. He was also a supporter of the Perth Observatory where this asteroid was discovered.[2]

The official naming citation was published by the Minor Planet Center on 28 August 1996 (M.P.C. 27733).[13]


  1. ^ a b Lightcurve plot of (3893) DeLaeter, at the Palmer Divide Station, Brian Warner (2014). Rotation period of 5.633±0.003 hours with a brightness amplitude of 0.13±0.02 mag. Quality Code of 2. Summary figures at the LCDB, not available at ADS.


  1. ^ a b c d "JPL Small-Body Database Browser: 3893 DeLaeter (1980 FG12)" (2017-03-30 last obs.). Jet Propulsion Laboratory. Retrieved 17 November 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (3893) DeLaeter. Springer Berlin Heidelberg. p. 331. ISBN 978-3-540-00238-3. Retrieved 17 November 2017.
  3. ^ a b c d e f g h "LCDB Data for (3893) DeLaeter". Asteroid Lightcurve Database (LCDB). Retrieved 17 November 2017.
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 17 November 2017.
  5. ^ 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 17 November 2017.
  6. ^ 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 17 November 2017.
  7. ^ 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 17 November 2017.
  8. ^ 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 17 November 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" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 17 November 2017.
  10. ^ a b c Stephens, Robert D. (March 2004). "Photometry of 683 Lanzia, 1101 Clematis, 1499 Pori, 1507 Vaasa, and 3893 DeLaeter". The Minor Planet Bulletin. 31 (1): 4–6. Bibcode:2004MPBu...31....4S. ISSN 1052-8091. Retrieved 17 November 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 17 November 2017.
  12. ^ a b "3893 DeLaeter (1980 FG12)". Minor Planet Center. Retrieved 17 November 2017.
  13. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 November 2017.

External links[edit]