Discovery [1] | |
---|---|
Discovered by | E. Bowell |
Discovery site | Anderson Mesa Stn. |
Discovery date | 15 May 1985 |
Designations | |
(9298) Geake | |
Named after | John E. Geake (British astronomer) [2] |
1985 JM ·1994 VN2 | |
main-belt ·(middle) [3] Mitidika [4] | |
Orbital characteristics [1] | |
Epoch 4 September 2017 (JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 60.89 yr (22,241 days) |
Aphelion | 3.3406 AU |
Perihelion | 1.8041 AU |
2.5724 AU | |
Eccentricity | 0.2987 |
4.13 yr (1,507 days) | |
240.52° | |
0° 14m 20.04s / day | |
Inclination | 12.113° |
211.83° | |
120.10° | |
Physical characteristics | |
Dimensions | 6.50 km (calculated) [3] 11.54±0.27 km [5] 11.73±3.10 km [6] 12.40±4.66 km [7] 12.68±4.23 km [8] 14.040±0.983 km [9] [10] |
38.29±0.02 h [11] [lower-alpha 1] | |
0.033±0.008 [9] [10] 0.049±0.002 [5] 0.05±0.02 [6] 0.050±0.026 [8] 0.05±0.06 [7] 0.20 (assumed) [3] | |
S (assumed) [3] | |
13.20 [6] ·13.3 [1] [3] ·13.36 [8] ·13.42 [7] ·13.59±1.39 [12] ·13.6 [5] [9] | |
9298 Geake, provisional designation 1985 JM, is a Mitidika asteroid from the central regions of the asteroid belt, approximately 12 kilometers in diameter. It was discovered on 15 May 1985, by American astronomer Edward Bowell at Lowell Observatory's Anderson Mesa Station near Flagstaff, Arizona, United States. [13] The asteroid was named for British astronomer John E. Geake. [2]
Geake has been identified as a member of the Mitidika family, a dispersed asteroid family of carbonaceous C-type asteroids. The family is named after 2262 Mitidika (diameter of 9 km) and consists of 653 known members, the largest ones being 404 Arsinoë (95 km) and 5079 Brubeck (17 km). [4] [14] : 23 [lower-alpha 2]
The asteroid orbits the Sun in the central main-belt at a distance of 1.8–3.3 AU once every 4 years and 2 months (1,507 days). Its orbit has an eccentricity of 0.30 and an inclination of 12° with respect to the ecliptic. [1] It was first observed on a precovery taken at Palomar Observatory in May 1956, extending the body's observation arc by 29 years prior to its official discovery observation at Anderson Mesa. [13]
In August 2006, a rotational lightcurve of Geake was obtained from photometric observations by American astronomer Brian Warner at his Palmer Divide Observatory ( 716 ) in Colorado. Lightcurve analysis gave a rotation period of 38.29 hours with a brightness variation of 0.78 magnitude ( U=2 ). [11] [lower-alpha 1] While not being a slow rotator, it has a longer than average rotation, which lies normally between 2 and 20 hours. The body's high brightness amplitude of 0.78 magnitude also indicates that it has a non-spheroidal shape.
According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Geake measures between 11.54 and 14.040 kilometers in diameter and its surface has a low albedo between 0.033 and 0.05. [5] [6] [7] [8] [9] [10]
Contrary to the results obtained by the space-based observatories, the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20, derived from the family's namesake, [lower-alpha 2] and consequently calculates a much shorter diameter of 6.50 kilometers based on an absolute magnitude of 13.3, as the higher a body's reflectivity the smaller its diameter for a given brightness. [3]
This minor planet was named after British astronomer John E. Geake (1925–1998), who invented the direct-reading linear refractometer, which was used by the Cassini–Huygens space probe. [2] The official naming citation was published by the Minor Planet Center on 26 July 2000 ( M.P.C. 41029). [15]
997 Priska, provisional designation 1923 NR, is a carbonaceous Adeonian asteroid from the central regions of the asteroid belt, approximately 19 kilometers in diameter. It was discovered on 12 July 1923, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid's name is a common German female name, unrelated to the discoverer's contemporaries.
1039 Sonneberga, provisional designation 1924 TL, is a dark background asteroid, approximately 34 kilometers in diameter, located in the central region of the asteroid belt. It was discovered on 24 November 1924, by German astronomer Max Wolf at Heidelberg Observatory in southwest Germany. The asteroid was named for the German city of Sonneberg, where the Sonneberg Observatory is located.
1118 Hanskya is a large background asteroid, approximately 77 kilometers in diameter, located in the outer regions of the asteroid belt. Discovered by Sergey Belyavsky and Nikolaj Ivanov in 1927, it was named after Russian astronomer Aleksey Hansky. The presumed dark C-type asteroid has a rotation period of 15.6 hours.
11277 Ballard, provisional designation 1988 TW2, is a Phocaea asteroid from the inner regions of the asteroid belt, approximately 6.3 kilometers (3.9 miles) in diameter. It was discovered on 8 October 1988, by American astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California. The assumed S-type asteroid has a rotation period of at least 10 hours. It was named for American marine scientist Robert Ballard.
1707 Chantal, provisional designation 1932 RL, is a stony background asteroid from the Florian region in the inner asteroid belt, approximately 7.5 kilometers in diameter. It was discovered on 8 September 1932, by astronomer Eugène Delporte at the Royal Observatory of Belgium in Uccle. The S-type asteroid has a rotation period of at least 10 hours. It was named for Chantal, the niece of Belgian astronomer Georges Roland.
1267 Geertruida, provisional designation 1930 HD, is a carbonaceous background asteroid from the inner regions of the asteroid belt, approximately 20 kilometers in diameter. Discovered by astronomer Hendrik van Gent at Johannesburg Observatory in 1930, the asteroid was later named after Geertruid Pels, sister of Dutch astronomer Gerrit Pels.
2012 Guo Shou-Jing, provisional designation 1964 TE2, is a carbonaceous asteroid and Florian interloper from the inner regions of the asteroid belt, approximately 13 kilometers in diameter. It was discovered on 9 October 1964, by astronomers at the Purple Mountain Observatory in Nanking, China. The asteroid was named after Chinese astronomer Guo Shoujing.
5385 Kamenka, provisional designation 1975 TS3, is a background asteroid from the outer regions of the asteroid belt, approximately 16 kilometers (10 miles) in diameter. It was discovered on 3 October 1975, by Soviet astronomer Lyudmila Chernykh at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula. The presumed C-type asteroid has a rotation period of 6.68 hours. It was named for the Ukrainian town of Kamianka.
4944 Kozlovskij, provisional designation 1987 RP3, is a carbonaceous Witt asteroid from the central regions of the asteroid belt, approximately 10 kilometers (6 miles) in diameter. It was discovered on 2 September 1987, by Soviet astronomer Lyudmila Chernykh at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean Peninsula. The asteroid was named for Russian opera singer Ivan Kozlovsky.
2173 Maresjev, provisional designation 1974 QG1, is a dark background asteroid from the outer regions of the asteroid belt, approximately 28 kilometers (17 miles) in diameter. It was discovered on 22 August 1974, by Soviet–Ukrainian astronomer Lyudmila Zhuravleva at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula. It was named for Soviet war veteran Alexey Maresyev. The assumed C-type asteroid has a tentative rotation period of 11.6 hours.
1383 Limburgia, provisional designation 1934 RV, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 23 kilometers in diameter. It was discovered on 9 September 1934, by Dutch astronomer Hendrik van Gent at the Leiden Southern Station, annex to the Johannesburg Observatory in South Africa. It is named for the Dutch province Limburg.
1303 Luthera, provisional designation 1928 FP, is a dark asteroid and the parent body of the Luthera family, located in the outermost regions of the asteroid belt. It measures approximately 90 kilometers in diameter. The asteroid was discovered on 16 March 1928, by astronomer Friedrich Schwassmann at the Bergedorf Observatory in Hamburg, Germany, and later named after German astronomer Robert Luther.
1455 Mitchella, provisional designation 1937 LF, is a Florian asteroid, slow rotator and suspected tumbler from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 5 June 1937, by astronomer Alfred Bohrmann at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid was named after American astronomer Maria Mitchell.
2648 Owa, provisional designation 1980 VJ, is a background asteroid from the Flora region of the inner asteroid belt, approximately 6 kilometers in diameter. It was discovered on 8 November 1980, by American astronomer Edward Bowell at the Anderson Mesa Station near Flagstaff, Arizona, in the United States. The presumably S-type asteroid has a rotation period of 3.56 hours. It was named for the word "rock" in the Native American Hopi language.
1692 Subbotina, provisional designation 1936 QD, is a dark background asteroid from the central region of the asteroid belt, approximately 37 kilometers in diameter. The carbonaceous Cg-type asteroid has a rotation period of 9.2 hours. It was discovered by Grigory Neujmin at the Crimean Simeiz Observatory in 1936, and later named after Soviet mathematician and astronomer Mikhail Subbotin.
3823 Yorii, provisional designation 1988 EC1, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 11 kilometers in diameter.
4760 Jia-xiang, provisional designation 1981 GN1, is a background asteroid from the inner regions of the asteroid belt, approximately 5 kilometers (3 miles) in diameter. It was discovered on 1 April 1981, by astronomers at Harvard University's Oak Ridge Observatory in Massachusetts, United States. The presumed stony S-type asteroid was named after Chinese astronomer Zhang Jiaxiang. It has a rotation period of 14.96 hours.
1257 Móra, provisional designation 1932 PE, is an asteroid from the inner regions of the asteroid belt, approximately 15 kilometers in diameter. It was discovered on 8 August 1932, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany. The asteroid was named after Hungarian astronomer Károly Móra.
1422 Strömgrenia, provisional designation 1936 QF, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 5.5 kilometers in diameter. It was discovered on 23 August 1936, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany, and named after Swedish-Danish astronomer Svante Elis Strömgren.
(7563) 1988 BC, provisional designation 1988 BC, is a background asteroid from the central region of the asteroid belt, approximately 16 kilometers in diameter. It was discovered on 16 January 1988, by Japanese amateur astronomer Takuo Kojima at the YGCO Chiyoda Station in the Kantō region of Japan. The asteroid has a rotation period of 6.5 hours.