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 [1] (Taiwanese University) |
2006 GJ | |
main-belt [1] [2] ·( middle ) Merxia [3] [4] | |
Orbital characteristics [2] | |
Epoch 27 April 2019 (JD 2458600.5) | |
Uncertainty parameter 0 | |
Observation arc | 25.91 yr (9,464 d) |
Aphelion | 3.0903 AU |
Perihelion | 2.3208 AU |
2.7055 AU | |
Eccentricity | 0.1422 |
4.45 yr (1,625 d) | |
262.51° | |
0° 13m 17.4s / day | |
Inclination | 6.2031° |
105.82° | |
189.48° | |
Physical characteristics | |
Mean diameter | 2.1 km (est. at 0.23) [5] 3.54 km(calculated) [6] |
4.49±0.040 h [7] | |
0.057(assumed) [6] 0.23(family albedo) | |
C (assumed) [6] S (family based) [8] | |
15.6 [1] [2] | |
145534 Jhongda, provisional designation 2006 GJ, is an asteroid and member of the stony Merxia family, orbiting in the central region of the asteroid belt, approximately 2–3 kilometers (1–2 miles) in diameter. It was discovered by Taiwanese astronomers Yang Tingzhang and Ye Quanzhi at the Lulin Observatory on 1 April 2006. The likely elongated asteroid has a rotation period of 4.5 hours. [6] It was named for the Taiwanese National Central University. [1]
Jhongda is a member of the Merxia family ( 513 ), [3] [4] a large family of stony S-type asteroids named after its parent body 808 Merxia. [8] : 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 (1,625 days; semi-major axis of 2.71 AU). Its orbit has an eccentricity of 0.14 and an inclination of 6° with respect to the ecliptic. [2] The first precovery was taken by Spacewatch in February 1992, extending the asteroid's observation arc by 14 years prior to its discovery at the Lulin Observatory. [1]
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. [1] The official naming citation was published by the Minor Planet Center on 2 April 2007 ( M.P.C. 59389). [9]
In January 2014, a rotational lightcurve of Jhongda was obtained from photometric observation by astronomers at the Intermediate Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 4.490±0.040 hours with a high brightness variation of 0.67 in magnitude ( U=2 ) indicative of an elongated, non-spherical shape. [7] 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. [6] Conversely, Jhongda measure only 2.1 kilometers for an albedo of 0.23, [5] which is typical for the stony members of the Merxia family. [8] : 23
4659 Roddenberry, provisional designation 1981 EP20, is a Nysian asteroid from the inner regions of the asteroid belt, approximately 3.6 kilometers (2.2 miles) in diameter. It was discovered on 2 March 1981, by American astronomer Schelte Bus at the Siding Spring Observatory in Australia. The likely S-type asteroid has an unsecured rotation period of 12 hours. It was named for American screenwriter Gene Roddenberry.
10252 Heidigraf, provisional designation 4164 T-1, is a Koronian asteroid from the outer regions of the asteroid belt, approximately 6 kilometers in diameter. It was discovered during the Palomar–Leiden Trojan survey on 26 March 1971, by Ingrid and Cornelis van Houten at Leiden, and Tom Gehrels at Palomar Observatory in California, United States. The likely elongated S-type asteroid has a brightness variation of 0.56 magnitude. It was named after Heidi Graf, a former Head of the ESTEC Communications Office.
10001 Palermo, provisional designation 1969 TM1, is a Vestian asteroid and a slow rotator from the inner regions of the asteroid belt, approximately 4 kilometers (2.5 miles) in diameter. It was discovered on 8 October 1969, by Soviet–Russian astronomer Lyudmila Chernykh using a 0.4-meter double astrograph at the Crimean Astrophysical Observatory in Nauchnij on the Crimean peninsula. The asteroid is likely elongated in shape and has a long rotation period of 213 hours. It was named for the Italian city of Palermo to commemorate the discovery of Ceres two hundred years earlier.
2531 Cambridge, provisional designation 1980 LD, is a stony Eoan asteroid from the outer regions of the asteroid belt, approximately 20 kilometers in diameter. It was discovered on 11 June 1980, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station in Arizona, United States. The asteroid was named for the Cambridge University.
16879 Campai, provisional designation 1998 BH10, is a stony Witt asteroid and slow rotator from the central region of the asteroid belt, approximately 10 kilometers (6 miles) in diameter. The S-type asteroid was discovered on 24 January 1998, by Italian astronomers Andrea Boattini and Maura Tombelli at the Pistoia Mountains Astronomical Observatory in San Marcello Pistoiese, Tuscany, central Italy. It was named for Italian amateur astronomer Paolo Campai.
9931 Herbhauptman, provisional designation 1985 HH, is a stony Nysian asteroid from the inner regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 18 April 1985, by Czech astronomer Antonín Mrkos at the Kleť Observatory in former Czechoslovakia. The S-type asteroid has a rotation period of 4.44 hours. It was named after American mathematician and Nobel laureate Herbert A. Hauptman.
7803 Adachi, provisional designation 1997 EW2, is a stony Agnia asteroid from the middle region of the asteroid belt, approximately 6.4 kilometers (4 miles) in diameter. The asteroid was discovered on 4 March 1997, by Japanese amateur astronomer Takao Kobayashi at the Ōizumi Observatory in central Japan. It was named for Japanese amateur astronomer Makoto Adachi. The S-type asteroid has a rotation period of 5.2 hours.
5655 Barney, provisional designation 1159 T-2, is a Maria asteroid from the central regions of the asteroid belt, approximately 6.5 kilometers in diameter. It was discovered during the second Palomar–Leiden Trojan survey in 1973, and named for American astronomer Ida Barney in 1994. The stony S-type asteroid has a rotation period of 2.66 hours.
3430 Bradfield (prov. designation: 1980 TF4) is a stony Agnia asteroid from the central regions of the asteroid belt, approximately 8 kilometers (5 miles) in diameter. It was discovered on 9 October 1980, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California. The Sq-type asteroid was named after comet hunter William A. Bradfield.
3268 De Sanctis, provisional designation 1981 DD, is a Vestian asteroid from the inner regions of the asteroid belt, approximately 6 kilometers in diameter. It was discovered on 26 February 1981, by European astronomers Henri Debehogne and Giovanni de Sanctis at ESO's La Silla Observatory in northern Chile. The asteroid was named after the second discoverer. The assumed S-type asteroid has a rotation period of 17 hours.
2440 Educatio is a Florian asteroid from the inner regions of the asteroid belt, approximately 6.6 kilometers in diameter. The possibly elongated S-type asteroid has an exceptionally long rotation period of 1561 hours and is one of the slowest rotators known to exist. It was discovered on 7 November 1978, by American astronomers Eleanor Helin and Schelte Bus at the Palomar Observatory in California, and later named "Educatio", the Latin word for Education.
3031 Houston, provisional designation 1984 CX, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 6 kilometers in diameter. It was discovered on 8 February 1984, by American astronomer Edward Bowell at Anderson Mesa Station near Flagstaff, Arizona. It was named after American amateur astronomer Walter Scott Houston.
10245 Inselsberg, provisional designation 6071 P-L, is a Gefion asteroid from the central regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 24 September 1960, by Ingrid and Cornelis van Houten at Leiden, and Tom Gehrels at Palomar Observatory in California, United States. The likely S-type asteroid was named for the German mountain Großer Inselsberg.
145523 Lulin, provisional designation 2006 EM67, is a background asteroid from the central region of the asteroid belt, approximately 3.9 kilometers (2.4 miles) in diameter. It was discovered on 7 March 2006, by Taiwanese astronomers Hung-Chin Lin (林宏欽) and Ye Quanzhi (葉泉志) at Lulin Observatory in central Taiwan. It was named for the Lulin mountain and the observatory site.
21795 Masi, provisional designation 1999 SN9, is a Nysian asteroid from the inner regions of the asteroid belt, approximately 3 kilometers (2 miles) in diameter. It was discovered on 29 September 1999, by Italian amateur astronomer Franco Mallia at the Campo Catino Astronomical Observatory in Lazio, Italy. The likely S-type asteroid has a rotation period of 13.86 hours. It was named for Italian astronomer Gianluca Masi.
7687 Matthias, provisional designation 2099 P-L, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 4 kilometers in diameter. It was discovered on 24 September 1960, by Ingrid and Cornelis van Houten at Leiden, and Tom Gehrels at Palomar Observatory in California. The S-type asteroid was named for German amateur astronomer Matthias Busch.
5542 Moffatt, provisional designation 1978 PT4, is a Marian asteroid from the central regions of the asteroid belt, approximately 9 kilometers (6 miles) in diameter. It was discovered on 6 August 1978, by astronomers at the Perth Observatory in Bickley, Australia. The likely S-type asteroid has a rotation period of 5.19 hours. It was named for Australian Ethelwin Moffatt, a benefactor of the discovering observatory.
5208 Royer (prov. designation: 1989 CH1) is a stony Marian asteroid from the central regions of the asteroid belt, approximately 8 kilometers (5 miles) in diameter. It was discovered on 6 February 1989, by astronomer Eleanor Helin at the Palomar Observatory. The S-type asteroid has a rotation period of 3.87 hours and was named after American priest and amateur astronomer, Ronald Royer.
4085 Weir, provisional designation 1985 JR, is a stony Eunomian asteroid from the central regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 13 May 1985, by astronomer Carolyn Shoemaker at the Palomar Observatory in California, United States. The asteroid was named after American geologist Doris Blackman Weir.
3131 Mason–Dixon (prov. designation: 1982 BM1) is a Koronian asteroid from the outer regions of the asteroid belt. It was discovered on 24 January 1982, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station in Arizona, United States. The likely S-type asteroid has a rotation period of 19.7 hours and measures approximately 14 kilometers (9 miles) in diameter. It was named for English astronomers Charles Mason and Jeremiah Dixon.