(4715) 1989 TS1
Discovery [1][2] | |
---|---|
Discovered by | Y. Oshima |
Discovery site | Gekko Obs. |
Discovery date | 9 October 1989 |
Designations | |
MPC designation | (4715) 1989 TS1 |
1989 TS1 · 1972 GL1 1983 DF | |
Jupiter trojan [3] Trojan [4] · background [5] | |
Orbital characteristics [3] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 63.62 yr (23,236 d) |
Aphelion | 5.3591 AU |
Perihelion | 4.8598 AU |
5.1094 AU | |
Eccentricity | 0.0489 |
11.55 yr (4,218 d) | |
180.77° | |
0° 5m 7.08s / day | |
Inclination | 18.658° |
1.6077° | |
345.36° | |
Jupiter MOID | 0.0924 AU |
TJupiter | 2.8940 |
Physical characteristics | |
Mean diameter |
±0.43 km 62.10[6] ±1.80 km 65.93[7] |
±0.0025 h 8.8129[8][9] | |
±0.010 0.060[6] ±0.005 0.079[7] | |
C (assumed)[8] B–V = ±0.060 0.680[10] V–R = ±0.040 0.430[10] V–I = ±0.030 0.850[8] | |
9.30[7] 9.7[1][6] | |
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(4715) 1989 TS1, provisional designation 1989 TS1, is a dark Jupiter trojan from the Trojan camp, approximately 64 kilometers (40 miles) in diameter. It was discovered on 9 October 1989, by Japanese astronomer Yoshiaki Oshima at the Gekko Observatory east of Shizuoka, Japan.[1] The assumed C-type asteroid belongs to the 70 largest Jupiter trojans. It is possibly elongated in shape and has a rotation period of 8.8 hours.[8] It has not yet been named since its numbering in January 1991.[11]
Orbit and classification
1989 TS1 is orbiting in the trailering Trojan camp, at Jupiter's L5 Lagrangian point, 60° behind the Gas Giant's orbit in a 1:1 resonance . It is also a non-family asteroid of the Jovian background population.[5]
It orbits the Sun at a distance of 4.9–5.4 AU once every 11 years and 7 months (4,218 days; semi-major axis of 5.11 AU). Its orbit has an eccentricity of 0.05 and an inclination of 19° with respect to the ecliptic.[3] The body's observation arc begins with a precovery taken at Palomar Observatory in October 1954, or 35 years prior to its official discovery observation at Gekko.[1]
Physical characteristics
1989 TS1 is an assumed C-type asteroid.[8] It has a V–I color index of 0.85, slightly below that seen for most Jovian D-type asteroids (also seen table below).
Rotation period
A rotational lightcurve of 1989 TS1 was first obtained by Stefano Mottola in November 1991, using the Loiano 1.52-meter telescope at Bologna Observatory in Italy.[9] Lightcurve analysis gave a rotation period of ±0.0025 hours with a brightness amplitude of 0.46 8.8129magnitude (U=3).[9] In September 2012, it was also observed in the R-band by astronomers at the Palomar Transient Factory in California (U=2).[8][12]
Since January 2015, several photometric observations by Robert Stephens at the Center for Solar System Studies in California confirmed Mottola's period determination from 1991, and measured a brightness amplitude of 0.50–0.53, which is indicative of a non-spherical, possibly elongated shape (U=3-/3-/3).[13][14][15][lower-alpha 1]
Diameter and albedo
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 1989 TS1 measures between 62.10 and 65.93 kilometers in diameter and its surface has an albedo between 0.060 and 0.079.[6][7] It has not been observed by the Supplemental IRAS Minor Planet Survey.[16] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 63.91 kilometers based on an absolute magnitude of 9.7.[8]
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Numbering and naming
This minor planet was numbered by the Minor Planet Center on 30 January 1991 (M.P.C. 17619).[11] Since then, most low-numbered minor planets have received a name. Up to number 5000, only a small group of Jupiter trojans and near-Earth asteroids remain unnamed::
- (3708) 1974 FV1
- (4035) 1986 WD
- (4489) 1988 AK
- (4596) 1981 QB
- (4688) 1980 WF
- (4715) 1989 TS1
- (4835) 1989 BQ
- (4953) 1990 MU
Notes
References
- 1 2 3 4 "4715 (1989 TS1)". Minor Planet Center. Retrieved 14 June 2018.
- ↑ "Asteroid (4715) 1989 TS1". Small Bodies Data Ferret. Retrieved 14 June 2018.
- 1 2 3 "JPL Small-Body Database Browser: 4715 (1989 TS1)" (2018-05-19 last obs.). Jet Propulsion Laboratory. Retrieved 14 June 2018.
- ↑ "List of Jupiter Trojans". Minor Planet Center. 30 May 2018. Retrieved 14 June 2018.
- 1 2 "Asteroid (884) Priamus – Proper elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 13 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 13 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 13 June 2018. (online, AcuA catalog p. 153)
- 1 2 3 4 5 6 7 "LCDB Data for (4715)". Asteroid Lightcurve Database (LCDB). Retrieved 14 June 2018.
- 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 14 June 2018.
- 1 2 Chatelain, Joseph P.; Henry, Todd J.; French, Linda M.; Winters, Jennifer G.; Trilling, David E. (June 2016). "Photometric colors of the brightest members of the Jupiter L5 Trojan cloud". Icarus. 271: 158–169. Bibcode:2016Icar..271..158C. doi:10.1016/j.icarus.2016.01.026. Retrieved 13 June 2016.
- 1 2 "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 14 June 2018.
- ↑ Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry" (PDF). The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 14 June 2018.
- ↑ Stephens, Robert D.; Coley, Daniel R.; French, Linda M. (July 2015). "Dispatches from the Trojan Camp - Jovian Trojan L5 Asteroids Observed from CS3: 2014 October - 2015 January". The Minor Planet Bulletin. 42 (3): 216–224. Bibcode:2015MPBu...42R.216S. ISSN 1052-8091. Retrieved 14 June 2018.
- ↑ Stephens, Robert D.; Coley, Daniel R.; French, Linda M. (July 2016). "A Report from the L5 Trojan Camp - Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies". The Minor Planet Bulletin. 43 (3): 265–270. Bibcode:2016MPBu...43..265S. ISSN 1052-8091. Retrieved 14 June 2018.
- ↑ Stephens, Robert D.; Coley, Daniel R. (July 2017). "Lightcurve Analysis of Trojan Asteroids at the Center for Solar System Studies 2017 January - March". The Minor Planet Bulletin. 44 (3): 252–257. Bibcode:2017MPBu...44..252S. ISSN 1052-8091. Retrieved 14 June 2018.
- ↑ 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.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- (4715) 1989 TS1 at AstDyS-2, Asteroids—Dynamic Site
- (4715) 1989 TS1 at the JPL Small-Body Database