(6090) 1989 DJ
Discovery [1] | |
---|---|
Discovered by | H. Debehogne |
Discovery site | La Silla Obs. |
Discovery date | 27 February 1989 |
Designations | |
MPC designation | (6090) 1989 DJ |
1989 DJ · 1977 EH2 1983 OH · 1990 FO1 | |
Jupiter trojan [1][2] Greek [3] · background [4] | |
Orbital characteristics [2] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 64.14 yr (23,428 d) |
Aphelion | 5.6151 AU |
Perihelion | 5.0068 AU |
5.3109 AU | |
Eccentricity | 0.0573 |
12.24 yr (4,470 d) | |
238.01° | |
0° 4m 49.8s / day | |
Inclination | 20.182° |
328.49° | |
72.131° | |
Jupiter MOID | 0.0053 AU |
TJupiter | 2.8730 |
Physical characteristics | |
Mean diameter |
±0.70 km 59.57[5] ±6.2 km 74.53[6] ±2.45 km 81.92[7] |
±0.007 h 18.476[8] | |
±0.003 0.046[7] ±0.011 0.0553[6] ±0.014 0.087[5] | |
C (assumed)[9] V–I = ±0.051 0.980[9] | |
9.40[1][2][5][6][7] | |
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(6090) 1989 DJ, provisional designation 1989 DJ, is a Jupiter trojan from the Greek camp, approximately 70 kilometers (43 miles) in diameter. It was discovered on 27 February 1989, by Belgian astronomer Henri Debehogne at ESO's La Silla Observatory in northern Chile.[1] The dark Jovian asteroid belongs to the 50 largest Jupiter trojans and has a rotation period of 18.5 hours.[9] It has not yet been named since its numbering in September 1994.[10]
Orbit and classification
1989 DJ is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of the Gas Giant's orbit in a 1:1 resonance . It is also a non-family asteroid in the Jovian background population.[4]
It orbits the Sun at a distance of 5.0–5.6 AU once every 12 years and 3 months (4,470 days; semi-major axis of 5.31 AU). Its orbit has an eccentricity of 0.06 and an inclination of 20° with respect to the ecliptic.[2] The body's observation arc begins with a precovery taken at Palomar Observatory in March 1954, almost 35 years prior to its official discovery observation.[1]
Physical characteristics
1989 DJ is an assumed C-type asteroid. Its V–I color index of 0.98 is typical for that of most Jovian D-types, the dominant spectral type among the larger Jupiter trojans.[9]
Rotation period
Italian astronomer Stefano Mottola obtained two concurring rotational lightcurves 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 ±0.05 hours and a brightness variation of 18.60±0.01 0.09magnitude (U=2+). In September 2009, he used the 1.2-meter reflector at Calar Alto Observatory, Spain, and measured a refined period of ±0.007 hours with an amplitude of 18.476±0.01 in magnitude ( 0.16U=2+), confirming his previous result.[8][9]
Diameter and albedo
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, 1989 DJ measures between 59.57 and 81.92 kilometers in diameter and its surface has an albedo between 0.046 and 0.087.[5][6][7] The Collaborative Asteroid Lightcurve Link adopts an albedo of 0.0553 from IRAS, and derives a similar diameter of 74.53 kilometers based on an absolute magnitude of 9.4.[8]
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Numbering and naming
This minor planet was numbered on 19 September 1994 (M.P.C. 23964).[10] As of 2018, it has not been named.[1]
References
- 1 2 3 4 5 6 "6090 (1989 DJ)". Minor Planet Center. Retrieved 17 June 2018.
- 1 2 3 4 "JPL Small-Body Database Browser: 6090 (1989 DJ)" (2018-05-19 last obs.). Jet Propulsion Laboratory. Retrieved 17 June 2018.
- ↑ "List of Jupiter Trojans". Minor Planet Center. 30 May 2018. Retrieved 17 June 2018.
- 1 2 "Asteroid (6090) 1989 DJ – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 17 June 2018.
- 1 2 3 4 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:1209.1549. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. Retrieved 17 June 2018. (online catalog)
- 1 2 3 4 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. Retrieved 17 June 2018.
- 1 2 3 4 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 June 2018. (online, AcuA catalog p. 153)
- 1 2 3 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.
- 1 2 3 4 5 "LCDB Data for (6090)". Asteroid Lightcurve Database (LCDB). Retrieved 17 June 2018.
- 1 2 "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 June 2018.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- Asteroid (6090) 1989 DJ at the Small Bodies Data Ferret
- (6090) 1989 DJ at AstDyS-2, Asteroids—Dynamic Site
- (6090) 1989 DJ at the JPL Small-Body Database