Discovery [1] | |
---|---|
Discovered by | T. Urata |
Discovery site | Yakiimo Stn. |
Discovery date | 12 March 1978 |
Designations | |
(2090) Mizuho | |
Named after | Mizuho Urata (daughter of discoverer) [2] |
1978 EA ·1937 RE 1942 PG ·1951 EH 1952 HA4 ·1953 RT 1953 TP ·1959 VD 1964 TE ·1970 WV 1978 EJ | |
main-belt ·(outer) [3] | |
Orbital characteristics [1] | |
Epoch 4 September 2017 (JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 66.14 yr (24,157 days) |
Aphelion | 3.4819 AU |
Perihelion | 2.6635 AU |
3.0727 AU | |
Eccentricity | 0.1332 |
5.39 yr (1,967 days) | |
337.47° | |
0° 10m 58.8s / day | |
Inclination | 11.814° |
339.85° | |
341.20° | |
Physical characteristics | |
Dimensions | 17.991±0.141 [4] 18.185±0.117 km [5] 18.92±0.79 km [6] 35.28 km (calculated) [3] |
5.47±0.01 h [7] | |
0.057 (assumed) [3] 0.207±0.019 [6] 0.2154±0.0435 [5] 0.219±0.029 [4] | |
Tholen = S [1] · S [3] B–V = 0.871 [1] U–B = 0.499 [1] | |
10.99 [1] [3] [5] [6] | |
2090 Mizuho, provisional designation 1978 EA, is a stony asteroid from the outer region of the asteroid belt, approximately 18 kilometers in diameter.
The asteroid was discovered on 12 March 1978, by Japanese astronomer Takeshi Urata at the JCPM Yakiimo Station in Shimizu, Japan, who named it after his daughter, Mizuho Urata. [8]
Mizuho orbits the Sun in the outer main-belt at a distance of 2.7–3.5 AU once every 5 years and 5 months (1,967 days). Its orbit has an eccentricity of 0.13 and an inclination of 12° with respect to the ecliptic. [1]
The asteroid was first identified as 1937 RE at Simeiz Observatory. The first used observation was obtained at Heidelberg Observatory in 1951, extending the Mizuho's observation arc by 27 years prior to its official discovery observation. [8]
In the Tholen classification, Mizuho is characterized as a common S-type asteroid. [1]
In February 2010, a rotational lightcurve for Mizuho was obtained from photometric observations by James W. Brinsfield at the Via Capote Observatory ( G69 ) in California. It gave a rotation period of 5.47 hours with a brightness variation of 0.30 magnitude ( U=2+ ). [7]
According to the surveys carried out by the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Mizuho measures between 18.0 and 18.9 kilometers in diameter and its surface has an albedo of between 0.207 and 0.219, which is typical for stony asteroids. [4] [5] [6] The Collaborative Asteroid Lightcurve Link, however assumes a standard albedo for a carbonaceous C-type asteroid of 0.057 and correspondingly calculates a much larger diameter of 35.3 kilometers. [3]
The discoverer named this minor planet after his daughter, Mizuho Urata. [2] It was the first asteroid in over 50 years to be discovered by a non-professional astronomer, which set off a wave of interest in amateur asteroid discovery, especially in Japan. [9] The official naming citation was published by the Minor Planet Center on 1 September 1978 ( M.P.C. 4482). [10]
2023 Asaph, provisional designation 1952 SA, is a dark asteroid from the outer regions of the asteroid belt, approximately 21 kilometers in diameter. It was discovered on 16 September 1952, by astronomers of the Indiana Asteroid Program at Goethe Link Observatory in Indiana, United States.
1564 Srbija, provisional designation 1936 TB, is a dark asteroid from the outer region of the asteroid belt, approximately 36 kilometers in diameter. It was discovered on 15 October 1936, by Serbian astronomer Milorad Protić at the Belgrade Astronomical Observatory in Serbia. It is named for the country of Serbia.
1194 Aletta, provisional designation 1931 JG, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 55 kilometers in diameter. It was discovered on 13 May 1931, by South African astronomer Cyril Jackson at Johannesburg Observatory in South Africa. It was later named after the discoverer's wife Aletta Jackson.
1457 Ankara, provisional designation 1937 PA, is a stony asteroid from the central region of the asteroid belt, approximately 18 kilometers in diameter. It was discovered on 3 August 1937, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany, and later named for the Turkish capital city of Ankara.
1555 Dejan, provisional designation 1941 SA, is an asteroid from the background population of the central regions of the asteroid belt, approximately 22 kilometers in diameter. It was discovered on 15 September 1941, by Belgian astronomer Fernand Rigaux at the Royal Observatory of Belgium in Uccle. The asteroid was named after Dejan Đurković, son of Serbian astronomer Petar Đurković.
1805 Dirikis, provisional designation 1970 GD, is a stony Themistian asteroid from the outer region of the asteroid belt, approximately 26 kilometers in diameter.
1672 Gezelle, provisional designation 1935 BD, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 27 kilometers in diameter. It was discovered on 29 January 1935, by Belgian astronomer Eugène Delporte at Royal Observatory of Belgium in Uccle, Belgium. It was later named after Flemish poet and Roman Catholic priest Guido Gezelle.
1995 Hajek, provisional designation 1971 UP1, is a metallic asteroid from the middle region of the asteroid belt, approximately 13 kilometers in diameter.
1479 Inkeri, provisional designation 1938 DE, is an asteroid from the central regions of the asteroid belt. It is an exceptionally slow rotator, suspected tumbler and measures approximately 19 kilometers in diameter. It was discovered on 16 February 1938, by Finnish astronomer Yrjö Väisälä at the Iso-Heikkilä Observatory in Turku, Finland. "Inkeri" is the name of two of the discoverer's younger relatives as well as the local name of the former Finnish province of Ingria.
1987 Kaplan, provisional designation 1952 RH, is a stony Phocaea asteroid from the inner regions of the asteroid belt, approximately 14 kilometers in diameter. It was discovered on 11 September 1952, by Soviet astronomer Pelageya Shajn at the Simeiz Observatory on the Crimean peninsula. The asteroid was named after Soviet astrophysicist Samuil Kaplan.
1284 Latvia, provisional designation 1933 OP, is a rare-type asteroid from the middle region of the asteroid belt, approximately 37 kilometers in diameter. It was discovered on 27 July 1933, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany, and named after the Republic of Latvia.
1175 Margo, provisional designation 1930 UD, is a stony background asteroid from the outermost regions of the asteroid belt, approximately 24 kilometers in diameter. It was discovered on 17 October 1930, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The meaning of the asteroids's name is unknown.
1607 Mavis, provisional designation 1950 RA, is a stony asteroid from the central region of the asteroid belt, approximately 12 kilometers in diameter. It was discovered on 3 September 1950, by South African astronomer Ernest Johnson at Johannesburg Observatory in South Africa. It was later named after the wife of astronomer Jacobus Bruwer.
6025 Naotosato, provisional designation 1992 YA3, is an Eoan asteroid from the outer region of the asteroid belt, approximately 19 kilometers in diameter. It was discovered on 30 December 1992, by Japanese astronomer Takeshi Urata at the Nihondaira Observatory in Oohira, Japan. The asteroid was named after Japanese amateur astronomer Naoto Satō.
1691 Oort, provisional designation 1956 RB, is a rare-type carbonaceous Themistian asteroid from the outer region of the asteroid belt, approximately 33 kilometers in diameter.
2043 Ortutay, provisional designation 1936 TH, is a dark asteroid from the outer regions of the asteroid belt, approximately 45 kilometers in diameter. The asteroid was discovered by Hungarian astronomer György Kulin at the Konkoly Observatory, Budapest, on 12 November 1936. It was named after Hungarian ethnographer Gyula Ortutay.
2022 West, provisional designation 1938 CK, is a stony asteroid from the middle regions of the asteroid belt, approximately 12 kilometers in diameter. It was discovered by German astronomer Karl Reinmuth at Heidelberg Observatory on 7 February 1938. The asteroid was named after Danish astronomer Richard M. West.
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.
1481 Tübingia, provisional designation 1938 DR, is a dark asteroid from the outer region of the asteroid belt, approximately 34 kilometers in diameter. It was discovered on 7 February 1938, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany, and named for the German city of Tübingen.
7526 Ohtsuka, provisional designation 1993 AA, is a stony asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered by Japanese astronomer Takeshi Urata at Nihondaira Observatory Oohira Station, Japan, on 2 January 1993. The asteroid was named after Japanese astronomer Katsuhito Ohtsuka.