145534 Jhongda
| Discovery [1] | |
|---|---|
| Discovered by | T.-C. Yang Q.-Z. Ye |
| Discovery site | Lulin Obs. |
| Discovery date | 1 April 2006 |
| Designations | |
| (145534) Jhongda | |
Named after | National Central University [2] (Taiwanese University) |
| 2006 GJ | |
| main-belt · (middle) [3] Merxia [4] | |
| 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) | |
| 129.63° | |
| 0° 13m 16.68s / day | |
| Inclination | 6.2020° |
| 105.82° | |
| 189.49° | |
| 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
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
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]
Naming
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]
References
- ^ 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.
- ^ a b c d "145534 Jhongda (2006 GJ)". Minor Planet Center. Retrieved 12 September 2016.
- ^ a b c d e f "LCDB Data for (145534) Jhongda". Asteroid Lightcurve Database (LCDB). Retrieved 12 September 2016.
- ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 20 December 2017.
- ^ a b "Asteroid Size Estimator". CNEOS NASA/JPL. Retrieved 20 December 2017.
- ^ 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.
- ^ Tholen (2007). "Asteroid Absolute Magnitudes". EAR-A-5-DDR-ASTERMAG-V11.0. Planetary Data System. Retrieved 5 July 2017.
- ^ 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.
- ^ 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.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 12 September 2016.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (145001)-(150000) – Minor Planet Center
- 145534 Jhongda at the JPL Small-Body Database
