(7641) 1986 TT6
| Discovery [1] | |
|---|---|
| Discovered by | M. Antal |
| Discovery site | Toruń–Piwnice |
| Discovery date | 5 October 1986 |
| Designations | |
| MPC designation | (7641) 1986 TT6 |
|
1986 TT6 · 1975 VT5 1975 XS4 · 1986 VP5 1991 HY · 1996 RN26 | |
|
Jupiter trojan [1][2][3] Greek [4][5] · background [5] | |
| Orbital characteristics [2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 42.54 yr (15,539 d) |
| Aphelion | 5.4898 AU |
| Perihelion | 4.9398 AU |
| 5.2148 AU | |
| Eccentricity | 0.0527 |
| 11.91 yr (4,350 d) | |
| 171.71° | |
| 0° 4m 58.08s / day | |
| Inclination | 34.693° |
| 242.06° | |
| 228.81° | |
| Jupiter MOID | 0.0165 AU |
| TJupiter | 2.6420 |
| Physical characteristics | |
Mean diameter |
68.89 km (derived)[3] 68.97±3.2 km[6] 71.84±1.64 km[7] 75.28±2.43 km[8] |
| 27.770±0.013 h[9] | |
|
0.062±0.005[8] 0.0647 (derived)[3] 0.065±0.011[7] 0.0708±0.007[6] | |
|
D (Pan-STARRS)[10] D (SDSS-MOC)[11] C (assumed)[3] V–I = 0.980±0.035[3] | |
|
9.09±0.41[10] 9.30[6][7][8] 9.4[1][2][3] | |
|
| |
(7641) 1986 TT6, provisional designation 1986 TT6, is a large Jupiter trojan from the Greek camp, approximately 70 kilometers (43 miles) in diameter. It was discovered on 5 October 1986, by Slovak astronomer Milan Antal at the Toruń Centre for Astronomy in Piwnice, Poland.[1] The dark D-type asteroid is notably inclined and has longer-than-average rotation period of 27.8 hours.[3] It belongs to the 50 largest Jupiter trojans.
Orbit and classification
Inclined orbit of 1986 TT6
1986 TT6 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 (see Trojans in astronomy). It is also a non-family asteroid in the Jovian background population.[5][12]
It orbits the Sun at a distance of 4.9–5.5 AU once every 11 years and 11 months (4,350 days; semi-major axis of 5.21 AU). Its orbit has an eccentricity of 0.05 and a notably high inclination of 35° with respect to the ecliptic.[2] The asteroid was first observed as 1975 VT5 at Crimea–Nauchnij in November 1975. The body's observation arc begins with its official discovery observation at the Toruń Centre.[1]
Physical Characteristics
In the SDSS-based taxonomy, 1986 TT6 is a dark D-type asteroid.[11] It has also been characterized as a D-type by Pan-STARRS' survey.[3][10] Its V–I color index of 0.98 agrees with that of most Jovian D-type asteroids.[3]
Rotation period
In October 2009, a rotational lightcurve of 1986 TT6 was obtained from photometric observations by Italian astronomer Stefano Mottola at the Calar Alto Observatory in Spain. Lightcurve analysis gave a well-defined rotation period of 27.770 hours with a brightness amplitude of 0.40 magnitude (U=3).[3][9] While not being a slow rotator, its period is significantly longer than that of most larger Jupiter trojans, which have a spin rate of typically 10 hours. The body's relatively high brightness variation of 0.40 magnitude is also indicative of a non-spherical shape.
Diameter and albedo
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, this asteroid measures between 68.97 and 75.28 kilometers in diameter and its surface has an albedo between 0.062 and 0.071.[6][7][8] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0647 and a diameter of 68.89 kilometers based on an absolute magnitude of 9.4.[3]
100+ largest Jupiter trojans
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Numbering and naming
This minor planet was numbered by the Minor Planet Center on 22 May 1997 (M.P.C. 29897).[13] As of 2018, it has not been named.[1]
References
- 1 2 3 4 5 6 "7641 (1986 TT6)". Minor Planet Center. Retrieved 10 June 2018.
- 1 2 3 4 "JPL Small-Body Database Browser: 7641 (1986 TT6)" (2018-05-20 last obs.). Jet Propulsion Laboratory. Retrieved 10 June 2018.
- 1 2 3 4 5 6 7 8 9 10 11 "LCDB Data for (7641)". Asteroid Lightcurve Database (LCDB). Retrieved 10 June 2018.
- ↑ "List of Jupiter Trojans". Minor Planet Center. 30 May 2018. Retrieved 10 June 2018.
- 1 2 3 "Asteroid (7641) 1986 TT6". AstDyS-2, Asteroids – Dynamic Site. Retrieved 10 June 2018.
- 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 15 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" (PDF). The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. Retrieved 10 June 2018. (online catalog)
- 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 15 June 2018. (online, AcuA catalog p. 153)
- 1 2 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 10 June 2018.
- 1 2 3 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" (PDF). Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 10 June 2018.
- 1 2 Carvano, J. M.; Hasselmann, P. H.; Lazzaro, D.; Mothé-Diniz, T. (February 2010). "SDSS-based taxonomic classification and orbital distribution of main belt asteroids". Astronomy and Astrophysics. 510: 12. Bibcode:2010A&A...510A..43C. doi:10.1051/0004-6361/200913322. Retrieved 15 June 2018.
- ↑ "Asteroid (7641) 1986 TT6". Small Bodies Data Ferret. Retrieved 10 June 2018.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 10 June 2018.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- (7641) 1986 TT6 at AstDyS-2, Asteroids—Dynamic Site
- (7641) 1986 TT6 at the JPL Small-Body Database
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