4834 Thoas
Discovery [1] | |
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Discovered by | C. Shoemaker |
Discovery site | Palomar Obs. |
Discovery date | 11 January 1989 |
Designations | |
MPC designation | (4834) Thoas |
Pronunciation | /ˈθoʊəs/ THOH-əs |
Named after | Thoas (Greek mythology)[1] |
1989 AM2 · 1975 XX3 1986 XN · 1987 WP2 | |
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 | 30.59 yr (11,172 d) |
Aphelion | 5.9248 AU |
Perihelion | 4.5156 AU |
5.2202 AU | |
Eccentricity | 0.1350 |
11.93 yr (4,356 d) | |
210.23° | |
0° 4m 57.36s / day | |
Inclination | 28.466° |
76.035° | |
351.66° | |
Jupiter MOID | 0.5567 AU |
TJupiter | 2.7420 |
Physical characteristics | |
Mean diameter |
±0.46 km 72.33[6] ±3.8 km 86.82[7] km 86.90(derived)[3] ±2.26 km 96.21[8] |
±0.05 h 18.14[9] ±0.001 h 18.192[10] ±0.008 h 18.216[11] ±0.04 h 18.22[12] | |
±0.002 0.040[8] ±0.005 0.0490[7] 0.0536(derived)[3] ±0.008 0.085[6] | |
C (assumed)[3] V–I = ±0.033 0.950[3] | |
9.0[6] 9.1[2][3] 9.20[8] ±0.33 9.33[13] | |
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4834 Thoas, provisional designation 1989 AM2, is a large Jupiter trojan from the Greek camp, approximately 86 kilometers (53 miles) in diameter. It was discovered on 11 January 1989, by astronomer Carolyn Shoemaker at the Palomar Observatory.[1] The C-type asteroid is one of the 50 largest Jupiter trojans and has a rotation period of 18.19 hours.[3] It was named after Thoas from Greek mythology.[1]
Orbit and classification
Thoas 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 a non-family asteroid in the Jovian background population.[5][14] It orbits the Sun at a distance of 4.5–5.9 AU once every 11 years and 11 months (4,356 days; semi-major axis of 5.22 AU). Its orbit has an eccentricity of 0.14 and an inclination of 28° with respect to the ecliptic.[2]
The asteroid was first observed as 1975 XX3 Crimea–Nauchnij in December 1975. The body's observation arc begins in December 1986, with its observation as 1986 XN at Anderson Mesa Station, more than 2 years prior to its official discovery observation at Palomar.[1]
Physical characteristics
Thoas is an assumed C-type asteroid.[3]
Rotation period
In September 1996, observations by Stefano Mottola using the now decommissioned Bochum 0.61-metre Telescope at ESO's La Silla Observatory in Chile gave a rotation period of 18.22 hours with a brightness amplitude of 0.14 magnitude (U=3-).[12] Between 2010 and 2015, refined photometric observations by Robert Stephens, Daniel Coley, Brian Warner and collaborators at the Center for Solar System Studies in Landers, California, gave three concurring periods of 18.14–18.216 hours and a brightness variation of 0.22–0.39 magnitude, with the best rated result of 18.192 hours and an amplitude of 0.22 magnitude (U=3/3-/3).[9][10][11][lower-alpha 1]
Diameter and albedo
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Thoas measures between 72.33 and 96.21 kilometers in diameter and its surface has an albedo between 0.040 and 0.085.[6][7][8]
The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0536 and a diameter of 86.90 kilometers based on an absolute magnitude of 9.1.[3]
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Naming
This minor planet was named by the discoverer after the Greek hero Thoas from the Trojan War. Thoas was the commander of the Aetolians. He was impersonated by Poseidon, who, in Thoas's voice, rallied the Greeks and fought by their side in the shape of Thoas, when the Trojans were close to the Greek ships. The official naming citation was published by the Minor Planet Center on 25 August 1991 (M.P.C. 18647).[15]
Notes
References
- 1 2 3 4 5 6 "4834 Thoas (1989 AM2)". Minor Planet Center. Retrieved 4 June 2018.
- 1 2 3 4 "JPL Small-Body Database Browser: 4834 Thoas (1989 AM2)" (2017-07-04 last obs.). Jet Propulsion Laboratory. Retrieved 4 June 2018.
- 1 2 3 4 5 6 7 8 9 "LCDB Data for (4834) Thoas". Asteroid Lightcurve Database (LCDB). Retrieved 4 June 2018.
- ↑ "List of Jupiter Trojans". Minor Planet Center. 2 February 2018. Retrieved 4 June 2018.
- 1 2 3 "Asteroid (4834) Thoas". AstDyS-2, Asteroids – Dynamic Site. Retrieved 4 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 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 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 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 4 June 2018.
- 1 2 French, Linda M.; Stephens, Robert D.; Lederer, Susan M.; Coley, Daniel R.; Rohl, Derrick A. (April 2011). "Preliminary Results from a Study of Trojan Asteroids". The Minor Planet Bulletin. 38 (2): 116–120. Bibcode:2011MPBu...38..116F. ISSN 1052-8091. Retrieved 4 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 4 June 2018.
- 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 4 June 2018.
- ↑ 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 4 June 2018.
- ↑ "Asteroid 4834 Thoas". Small Bodies Data Ferret. Retrieved 4 June 2018.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 4 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
- 4834 Thoas at AstDyS-2, Asteroids—Dynamic Site
- 4834 Thoas at the JPL Small-Body Database