Astronomy:4035 Thestor

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4035 Thestor
Discovery [1]
Discovered byK. Suzuki
T. Urata
Discovery siteToyota Obs.
Discovery date22 November 1986
Designations
(4035) Thestor
Named afterThestor [2]
(Greek mythology)
1986 WD · 1973 SR4
1973 UF6
Minor planet categoryJupiter trojan [1][3][4]
Greek [5][6] · background [6]
AdjectivesThestorian
Orbital characteristics [3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc44.64 yr (16,306 d)
|{{{apsis}}}|helion}}5.5799 AU
|{{{apsis}}}|helion}}4.9899 AU
5.2849 AU
Eccentricity0.0558
Orbital period12.15 yr (4,438 d)
Mean anomaly213.24°
Mean motion0° 4m 51.96s / day
Inclination12.130°
Longitude of ascending node233.73°
197.56°
Jupiter MOID0.0243 AU
TJupiter2.9520
Physical characteristics
Mean diameter66.99±4.45 km[7]
68.23 km (derived)[4]
68.46±5.4 km [8]
68.73±1.24 km[9]
Rotation period13.467±0.08 h[10]
13.475±0.156 h[11]
13.49±0.20 h[12]
13.52±0.08 h[10]
Geometric albedo0.054±0.008[9]
0.0548 (derived)[4]
0.0718±0.013[8]
0.076±0.010[7]
C (assumed)[4]
V–I = 0.970±0.031[4]
Absolute magnitude (H)9.30[7]
9.6[1][3][4][9]
9.82±0.46[13]


4035 Thestor, provisional designation: 1986 WD, is a large Jupiter trojan from the Greek camp, approximately 68 kilometers (42 miles) in diameter. It was discovered on 22 November 1986, by Japanese astronomers Kenzo Suzuki and Takeshi Urata at the Toyota Observatory (881) in Toyota, Japan.[1] The assumed C-type asteroid belongs to the 50 largest Jupiter trojans and has a rotation period of 13.5 hours.[4] Of more than half a million numbered minor planets, it has been the second-lowest numbered body without a name, until May 2021, when it was named after Thestor, a grandson of Apollo from Greek mythology.[2]

Classification and orbit

Thestor 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.[6][14]

It orbits the Sun at a distance of 5.0–5.6 AU once every 12 years and 2 months (4,438 days; semi-major axis of 5.28 AU). Its orbit has an eccentricity of 0.06 and an inclination of 12° with respect to the ecliptic.[3] The body's observation arc begins with its first observation as 1973 SR4 at Crimea–Nauchnij in September 1973, or 13 years prior to its official discovery observation at Toyota, Japan.[1]

Numbering and naming

This minor planet was numbered by the Minor Planet Center on 22 March 1989 (M.P.C. 14337).[15] On 14 May 2021, the object was named by the Working Group for Small Bodies Nomenclature (WGSBN), after Thestor from Greek mythology, who was a grandson of Apollo and the father of Calchas.[2]

Before Thestor was named, it belonged to a small group of only 8 unnamed minor planets with a designated number smaller than 5000. (All of them are Jupiter trojans or near-Earth asteroids). Since then, several have already been named:


Physical characteristics

Thestor is an assumed, carbonaceous C-type asteroid, which is in line with the body's albedo (see below), while its V–I color index of 0.93 agrees with that of most Jovian D-type asteroids.[4]

Rotation period

In October 2009, a rotational lightcurve was obtained from photometric observations by astronomer Stefano Mottola at the Calar Alto Observatory in Spain. It gave a well-defined rotation period of 13.467±0.08 hours with a brightness variation of 0.21 in magnitude ({{{1}}}), superseding a period of 13.52 hours and an amplitude of more than 0.20 previously measured with the ESO 1-metre telescope at La Silla Observatory in May 1991 ({{{1}}}).[10]

In August 2015, photometric observations of Thestor by the Kepler space observatory during its K2 mission gave a concurring period of 13.475 and 13.49 hours with a brightness amplitude of 0.18 and 0.17 magnitude observations ({{{1}}}).[4][11][12]

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, the asteroid measures between 66.99 and 68.73 kilometers in diameter and its surface has an albedo between 0.054 and 0.076.[8][7][9] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0548 and a diameter of 68.23 kilometers based on an absolute magnitude of 9.6.[4]

100+ largest Jupiter trojans

References

  1. ↑ Jump up to: 1.0 1.1 1.2 1.3 1.4 "4035 (1986 WD)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=4035. Retrieved 10 June 2018. 
  2. ↑ Jump up to: 2.0 2.1 2.2 "WGSBN Bulletin Archive". Working Group for Small Bodies Nomenclature. 14 May 2021. https://www.wgsbn-iau.org/files/Bulletins/index.html. Retrieved 16 May 2021.  (Bulletin #1)
  3. ↑ Jump up to: 3.0 3.1 3.2 3.3 "JPL Small-Body Database Browser: 4035 (1986 WD)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2004035. Retrieved 10 June 2018. 
  4. ↑ Jump up to: 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 "LCDB Data for (4035)". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=4035%7C. Retrieved 29 June 2016. 
  5. ↑ "List of Jupiter Trojans". Minor Planet Center. 30 May 2018. https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html. Retrieved 10 June 2018. 
  6. ↑ Jump up to: 6.0 6.1 6.2 "Asteroid (4035) 1986 WD – Proper elements". AstDyS-2, Asteroids – Dynamic Site. https://newton.spacedys.com/astdys/index.php?n=4035&pc=1.1.6. Retrieved 10 June 2018. 
  7. ↑ Jump up to: 7.0 7.1 7.2 7.3 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. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U.  (online, AcuA catalog p. 153)
  8. ↑ Jump up to: 8.0 8.1 8.2 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: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode: 2004PDSS...12.....T. https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab. Retrieved 15 June 2018. 
  9. ↑ Jump up to: 9.0 9.1 9.2 9.3 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. doi:10.1088/0004-637X/759/1/49. Bibcode: 2012ApJ...759...49G.  (online catalog)
  10. ↑ Jump up to: 10.0 10.1 10.2 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. doi:10.1088/0004-6256/141/5/170. Bibcode: 2011AJ....141..170M. 
  11. ↑ Jump up to: 11.0 11.1 Szabó, Gy. M.; Pál, A.; Kiss, Cs.; Kiss, L. L.; Molnár, L.; Hanyecz, O. et al. (March 2017). "The heart of the swarm: K2 photometry and rotational characteristics of 56 Jovian Trojan asteroids". Astronomy and Astrophysics 599: 13. doi:10.1051/0004-6361/201629401. Bibcode: 2017A&A...599A..44S. 
  12. ↑ Jump up to: 12.0 12.1 Ryan, Erin Lee; Sharkey, Benjamin N. L.; Woodward, Charles E. (March 2017). "Trojan Asteroids in the Kepler Campaign 6 Field". The Astronomical Journal 153 (3): 12. doi:10.3847/1538-3881/153/3/116. Bibcode: 2017AJ....153..116R. 
  13. ↑ 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". Icarus 261: 34–47. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. 
  14. ↑ "Asteroid (4035) 1986 WD". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=4035. Retrieved 10 June 2018. 
  15. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 10 June 2018. 

External links



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