2260 Neoptolemus
Discovery [1] | |
---|---|
Discovered by | Purple Mountain Obs. |
Discovery site | Purple Mountain Obs. |
Discovery date | 26 November 1975 |
Designations | |
MPC designation | (2260) Neoptolemus |
Pronunciation |
/ˌniːəpˈtɒlɪməs/ NEE-op-TOL-ə-məs |
Named after |
Neoptolemus [1] (Greek mythology) |
1975 WM1 · 1951 XK | |
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 | 66.46 yr (24,276 d) |
Aphelion | 5.4219 AU |
Perihelion | 4.9699 AU |
5.1959 AU | |
Eccentricity | 0.0435 |
11.84 yr (4,326 d) | |
242.76° | |
0° 4m 59.52s / day | |
Inclination | 17.779° |
86.573° | |
320.49° | |
Jupiter MOID | 0.095 AU |
TJupiter | 2.9030 |
Physical characteristics | |
Mean diameter |
±3.4 km 71.65[6] ±0.786 km 76.435[7] ±3.75 km 81.28[8] |
±0.008 h 8.180[9] ±0.022 h 8.180[9] ±0.05 h 8.18[10][lower-alpha 1] ±0.005 h 8.199[11][lower-alpha 1] h 8.5(poor)[12] h 12(poor)[13] | |
±0.005 0.051[8] ±0.008 0.057[7] ±0.007 0.0650[6] | |
DTU: (Tholen)[2][3] D (Pan-STARRS)[14] D (SDSS-MOC)[15][16] V–I = ±0.024 0.950[3] | |
9.31[1][2][3][6][7][8] ±0.25 9.32[14] | |
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2260 Neoptolemus (/ˌniːəpˈtɒlɪməs/ NEE-op-TOL-ə-məs), provisional designation 1975 WM1, is a large Jupiter trojan from the Greek camp, approximately 76 kilometers (47 miles) in diameter. It was discovered on 26 November 1975, by astronomers at the Purple Mountain Observatory in Nanking, China.[1] The dark D-type asteroid is one of the 50 largest Jupiter trojans and has a rotation period of 8.18 hours.[3] It was named after Neoptolemus from Greek mythology.[1]
Orbit and classification
Neoptolemus 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][15]
This asteroid orbits the Sun at a distance of 5.0–5.4 AU once every 11 years and 10 months (4,326 days; semi-major axis of 5.2 AU). Its orbit has an eccentricity of 0.04 and an inclination of 18° with respect to the ecliptic.[2] The body's observation arc begins with its first observation as 1951 XK at McDonald Observatory in December 1951, almost 24 years prior to its official discovery observation at Nanking.[1]
Physical characteristics
In the SDSS-based taxonomy, Neoptolemus is a dark D-type asteroid.[15][16] It has also been characterized as a D-type by the survey conducted by Pan-STARRS,[3][14] while in the Tholen classification the body's spectral type is ambiguous, closest to a D-type and somewhat similar to a T-type asteroid, with a spectrum flagged as unusual and moderately noisy (DTU:).[2][3]
Rotation period
In August 1995, and in March 2002, two rotational lightcurves of Neoptolemus were obtained from photometric observations by Italian astronomer Stefano Mottola using the Bochum 0.61-metre Telescope at La Silla Observatory, Chile, and the 1.52-meter Loiano Telescope at the Observatory of Bologna, Italy, respectively. Lightcurve analysis gave a well-defined rotation period of 8.180 hours and a brightness variation of 0.20 and 0.32 magnitude, respectively (U=3/3).[3][9]
Follow-up observation by Robert Stephens at the Center for Solar System Studies in 2015, and 2016, gave a concurring period of 8.18 and 8.199 hours with a corresponding amplitude of 0.14 and 0.03 magnitude (U=2-/2).[3][10][11][lower-alpha 1]
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, Neoptolemus measures between 71.65 and 81.28 kilometers in diameter and its surface has an albedo between 0.051 and 0.0650.[6][7][8]
The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0650 and a diameter of 71.65 kilometers based on an absolute magnitude of 9.31.[3]
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Naming
This minor planet was named from Greek mythology after the Greek warrior Neoptolemus, son of Achilles and Deidameia, who was brought to Troy by Odysseus in the last year of the Trojan War. Neoptolemus was one of the Greeks who were hiding in the wooden Trojan Horse. He brutally killed King Priam and several other princes during the destruction of the city of Troy.[1]
The official naming citation was published by the Minor Planet Center on 1 August 1981 (M.P.C. 6208).[17]
Notes
References
- 1 2 3 4 5 6 7 8 "2260 Neoptolemus (1975 WM1)". Minor Planet Center. Retrieved 6 June 2018.
- 1 2 3 4 5 6 "JPL Small-Body Database Browser: 2260 Neoptolemus (1975 WM1)" (2018-05-23 last obs.). Jet Propulsion Laboratory. Retrieved 6 June 2018.
- 1 2 3 4 5 6 7 8 9 10 "LCDB Data for (2260) Neoptolemus". Asteroid Lightcurve Database (LCDB). Retrieved 6 June 2018.
- ↑ "List of Jupiter Trojans". Minor Planet Center. 30 May 2018. Retrieved 6 June 2018.
- 1 2 3 "Asteroid (2260) Neoptolemus – Proper elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 5 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 9 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 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 6 June 2018.
- 1 2 Stephens, Robert D.; Coley, Daniel, R.; French, Linda M. (January 2016). "Large L5 Jovian Trojan Asteroid Lightcurves from the Center for Solar System Studies". The Minor Planet Bulletin. 43 (1): 15–22. Bibcode:2016MPBu...43...15S. ISSN 1052-8091. Retrieved 6 June 2018.
- 1 2 Stephens, Robert D.; Coley, Daniel R.; Warner, Brian D.; French, Linda, M. (October 2016). "Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies: L4 Greek Camp and Spies". The Minor Planet Bulletin. 43 (4): 323–331. Bibcode:2016MPBu...43..323S. ISSN 1052-8091. Retrieved 6 June 2018.
- ↑ Angeli, Cláudia A.; Lazzaro, Daniela; Florczak, Marcos A.; Betzler, Alberto S.; Carvano, Jorge M. (May 1999). "A contribution to the study of asteroids with longrotational period". Planetary and Space Science. 47 (5): 699–714. Bibcode:1999P&SS...47..699A. doi:10.1016/S0032-0633(98)00122-6. Retrieved 6 June 2018.
- ↑ Binzel, Richard P.; Sauter, Linda M. (February 1992). "Trojan, Hilda, and Cybele asteroids - New lightcurve observations and analysis". Icarus: 222–238. Bibcode:1992Icar...95..222B. doi:10.1016/0019-1035(92)90039-A. ISSN 0019-1035. Retrieved 6 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 6 June 2018.
- 1 2 3 "Asteroid 2260 Neoptolemus". Small Bodies Data Ferret. Retrieved 6 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.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 6 June 2018.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 2260 Neoptolemus at AstDyS-2, Asteroids—Dynamic Site
- 2260 Neoptolemus at the JPL Small-Body Database