(6090) 1989 DJ

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(6090) 1989 DJ
Discovery [1]
Discovered by H. Debehogne
Discovery site La Silla Obs.
Discovery date 27 February 1989
MPC designation (6090) 1989 DJ
1989 DJ · 1977 EH2
1983 OH · 1990 FO1
Jupiter trojan[1][2]
(Trojan camp)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 62.94 yr (22,988 days)
Aphelion 5.6143 AU
Perihelion 5.0085 AU
5.3114 AU
Eccentricity 0.0570
12.24 yr (4,471 days)
0° 4m 49.8s / day
Inclination 20.179°
Jupiter MOID 0.0066 AU
TJupiter 2.8730
Physical characteristics
Dimensions 59.568±0.702 km[1][4]
59.57±0.70 km[2][5]
74.53 km (IRAS:9)[6]
78 km[7]
81.92±2.45 km[8]
18.476±0.007 h (2009)[7]
18.60±0.05 (1994)[7]
0.0553 (IRAS:9)[6]
9.4 (IRAS:9)[6] · 9.4[5][7][8] · 10.54±0.47[9]

(6090) 1989 DJ is a carbonaceous Jupiter trojan from the Greek camp, approximately 70 kilometers in diameter. It was discovered on 27 February 1989, by Belgian astronomer Henri Debehogne at ESO's La Silla Observatory in northern Chile.[10]

Orbit and classification[edit]

The dark C-type asteroid is orbiting in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of its orbit (see Trojans in astronomy). It orbits the Sun at a distance of 5.0–5.6 AU once every 12 years and 3 months (4,471 days). Its orbit has an eccentricity of 0.06 and an inclination of 20° with respect to the ecliptic.[1] The first precovery was taken at Palomar Observatory in 1954, extending the body's observation arc by 35 years prior to its discovery.[10]

Physical characteristics[edit]

Rotation period[edit]

Italian astronomer Stefano Mottola obtained two concurring rotational lightcurves for this asteroid from photometric observations. In June 1994, together with astronomer Anders Erikson, he constructed a lightcurve from observations made with the 0.9-meter Dutch telescope at La Silla, showing a rotation period of 18.60±0.05 hours and a brightness variation of 0.09±0.01 magnitude (U=2+). In September 2009, he used the 1.2-meter reflector at Calar Alto Observatory, Spain, to obtain a period of 18.476±0.007 hours with an amplitude of 0.16±0.01 in magnitude (U=2+), confirming his previous result.[7]

Diameter and albedo[edit]

According to the space-based 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, the asteroid measures between 59 and 82 kilometers in diameter and its surface has an albedo between 0.046 and 0.087.[4][5][6][8] The Collaborative Asteroid Lightcurve Link agrees with the results from IRAS, that is an albedo of 0.0553 and a diameter of 74.5 kilometers, based on an absolute magnitude of 9.4,[2] while Stefano Mottola estimated a diameter of 78 kilometers.[7]


  1. ^ a b c d e f "JPL Small-Body Database Browser: 6090 (1989 DJ)" (2017-03-05 last obs.). Jet Propulsion Laboratory. Retrieved 26 May 2017. 
  2. ^ a b c d e "LCDB Data for (6090)". Asteroid Lightcurve Database (LCDB). Retrieved 31 August 2016. 
  3. ^ "List of Jupiter Trojans". Minor Planet Center. 20 June 2016. Retrieved 31 August 2016. 
  4. ^ a b c Grav, T.; Mainzer, A. K.; Bauer, J. M.; Masiero, J. R.; Nugent, C. R. (November 2012). "WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy". The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549Freely accessible. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. Retrieved 31 August 2016. 
  5. ^ 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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 31 August 2016. 
  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. Bibcode:2004PDSS...12.....T. Retrieved 8 December 2016. 
  7. ^ a b c d e f Mottola, Stefano; Di Martino, Mario; Erikson, Anders; Gonano-Beurer, Maria; Carbognani, Albino; Carsenty, Uri; et al. (May 2011). "Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects". The Astronomical Journal. 141 (5): 32. Bibcode:2011AJ....141..170M. doi:10.1088/0004-6256/141/5/170. Retrieved 31 August 2016. 
  8. ^ 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 31 August 2016. 
  9. ^ 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 31 August 2016. 
  10. ^ a b "6090 (1989 DJ)". Minor Planet Center. Retrieved 31 August 2016. 

External links[edit]