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2874 Jim Young, provisional designation 1982 TH, is a stony Florian asteroid and slow rotator from the inner regions of the asteroid belt, approximately 7.5 kilometers in diameter. It was discovered on 13 October 1982, by American astronomer Edward Bowell at Lowell Observatory's Anderson Mesa Station near Flagstaff, Arizona.[9] The asteroid was named after American astronomer James Young.[2]

2874 Jim Young
Discovery [1]
Discovered byE. Bowell
Discovery siteAnderson Mesa Stn.
Discovery date13 October 1982
MPC designation(2874) Jim Young
Named after
James Young
(American astronomer)[2]
1982 TH · 1962 WE
1965 SD · 1972 TD2
1972 XF
main-belt · Flora[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc62.99 yr (23,007 days)
Aphelion2.5452 AU
Perihelion1.9444 AU
2.2448 AU
3.36 yr (1,228 days)
0° 17m 34.8s / day
Physical characteristics
6.999±0.044 km[5]
7.47 km (calculated)[3]
7.70±0.43 km[6]
131.3 h[7]
0.24 (assumed)[3]
SMASS = S[1] · S[3]
12.8[1][3][6] · 13.06±0.03[8] · 13.2[5]

Orbit and classificationEdit

Jim Young is a member of the Flora family, one of the largest groups of stony asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 1.9–2.5 AU once every 3 years and 4 months (1,228 days). Its orbit has an eccentricity of 0.13 and an inclination of 5° with respect to the ecliptic.[1] A first precovery was taken at the Palomar Observatory in 1954, extending the asteroid's observation arc by 28 years prior to its official discovery observation at Anderson Mesa.[9]

Physical characteristicsEdit

In the SMASS classification, Jim Young is characterized as a stony S-type asteroid.[1]

Slow rotatorEdit

Jim Young is a slow rotator. These are bodies that take much longer to rotate once around their axis than most other asteroids typically do. In January 2007, a rotational lightcurve was obtained by American astronomer Donald P. Pray at his Carbuncle Hill Observatory (912). It gave a long rotation period of 131.3 hours with a brightness variation of approximately 0.75 in magnitude (U=2).[7]

Diameter and albedoEdit

According to two different data sets from NASA's space-based Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Jim Young measures between 6.6 and 7.7 kilometers in diameter and its surface has an albedo between 0.190 and 0.251.[4][5][6] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the family's largest member and namesake – and calculates a diameter of 7.5 kilometers with an absolute magnitude of 12.8.[3]


This minor planet was named for American astronomer James Young at JPL's Table Mountain Observatory near Wrightwood, California. At the time of citation, his numerous photometric observations significantly contributed to the number of then known rotation periods of asteroids.[2] The official naming citation was published by the Minor Planet Center on 10 September 1984 (M.P.C. 9081).[10] Young is also a prolific discoverer of minor planets, credited by the Minor Planet Center with the discovery of more than 250 numbered bodies.[11]


  1. ^ a b c d e f "JPL Small-Body Database Browser: 2874 Jim Young (1982 TH)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 14 June 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(2874) Jim Young". Dictionary of Minor Planet Names – (2874) Jim Young. Springer Berlin Heidelberg. p. 236. doi:10.1007/978-3-540-29925-7_2875. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f "LCDB Data for (2874) Jim Young". Asteroid Lightcurve Database (LCDB). Retrieved 31 July 2016.
  4. ^ a b c Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 6 December 2016.
  5. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
  6. ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 31 July 2016.
  7. ^ a b Pray, Donald P.; Galad, Adrian; Husarik, Marek; Oey, Julian (March 2008). "Lightcurve Analysis of Fourteen Asteroids". The Minor Planet Bulletin. 35 (1): 34–36. Bibcode:2008MPBu...35...34P. ISSN 1052-8091. Retrieved 31 July 2016.
  8. ^ 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. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 31 July 2016.
  9. ^ a b "2874 Jim Young (1982 TH)". Minor Planet Center. Retrieved 31 July 2016.
  10. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 31 July 2016.
  11. ^ "Minor Planet Discoverers (by number)". Minor Planet Center. 23 May 2016. Retrieved 31 July 2016.

External linksEdit