145534 Jhongda

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145534 Jhongda
Discovery [1]
Discovered by T.-C. Yang
Q.-Z. Ye
Discovery site Lulin Obs.
Discovery date 1 April 2006
MPC designation (145534) Jhongda
Named after
National Central University[2]
(Taiwanese University)
2006 GJ
main-belt · (middle)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 24.77 yr (9,046 days)
Aphelion 3.0901 AU
Perihelion 2.3231 AU
2.7066 AU
Eccentricity 0.1417
4.45 yr (1,626 days)
0° 13m 16.68s / day
Inclination 6.2020°
Physical characteristics
Dimensions 1.8 kilometers (derived 0.22)[5]
3.54 km (calculated)[3]
4.490±0.040 h[6]
0.057 (assumed)[3]
0.22 (parent body)
C (assumed)[3]
15.5[7] · 15.530±0.230 (R)[6] · 15.6[1] · 15.75±0.39[8] · 15.98[3]

145534 Jhongda, provisional designation 2006 GJ, is a Merxian asteroid from the central region of the asteroid belt, approximately 2 kilometers in diameter. It was discovered by Taiwanese astronomers Yang Tingzhang and Ye Quanzhi at Lulin Observatory on 1 April 2006. The asteroid was named for the Taiwanese National Central University.[2]

Orbit and classification[edit]

Jhongda is a member of the Merxia family (513),[4] a large family of stony S-type asteroids named after its parent body 808 Merxia.[9]:23 It orbits the Sun in the central main-belt at a distance of 2.3–3.1 AU once every 4 years and 5 months (1,626 days). Its orbit has an eccentricity of 0.14 and an inclination of 6° with respect to the ecliptic.[1] The first precovery was taken at Steward Observatory (Kitt Peak) in 1992, extending the asteroid's observation arc by 14 years prior to its discovery.[2]

Physical characteristics[edit]

In January 2014, a rotational lightcurve of Jhongda was obtained from photometric observation at the Palomar Transient Factory in California. It gave a rotation period of 4.490±0.040 hours with a brightness variation of 0.67 in magnitude (U=2).[6] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 3.54 kilometers with an absolute magnitude of 15.98.[3] Based on the same absolute magnitude and an albedo of 0.22, derived from the family's parent body, Jhongda would measure approximately 1.8 kilometers.[5]


This minor planet was named after the Taiwanese National Central University, which controls the discovering Lulin Observatory. "Jhongda" is the University's abbreviation in Mandarin Chinese.[2] The approved naming citation was published by the Minor Planet Center on 2 April 2007 (M.P.C. 59389).[10]


  1. ^ a b c d "JPL Small-Body Database Browser: 145534 Jhongda (2006 GJ)" (2016-12-01 last obs.). Jet Propulsion Laboratory. Retrieved 5 July 2017.
  2. ^ a b c d "145534 Jhongda (2006 GJ)". Minor Planet Center. Retrieved 12 September 2016.
  3. ^ a b c d e f "LCDB Data for (145534) Jhongda". Asteroid Lightcurve Database (LCDB). Retrieved 12 September 2016.
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 20 December 2017.
  5. ^ a b "Asteroid Size Estimator". CNEOS NASA/JPL. Retrieved 20 December 2017.
  6. ^ a b c Chang, Chan-Kao; Ip, Wing-Huen; Lin, Hsing-Wen; Cheng, Yu-Chi; Ngeow, Chow-Choong; Yang, Ting-Chang; et al. (August 2015). "Asteroid Spin-rate Study Using the Intermediate Palomar Transient Factory". The Astrophysical Journal Supplement Series. 219 (2): 19. arXiv:1506.08493. Bibcode:2015ApJS..219...27C. doi:10.1088/0067-0049/219/2/27. Retrieved 12 September 2016.
  7. ^ Tholen (2007). "Asteroid Absolute Magnitudes". EAR-A-5-DDR-ASTERMAG-V11.0. Planetary Data System. Retrieved 5 July 2017.
  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 12 September 2016.
  9. ^ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families" (PDF). Asteroids IV: 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. Retrieved 20 December 2017.
  10. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 12 September 2016.

External links[edit]