(2090) Mizuho
|
Asteroid (2090) Mizuho |
|
|---|---|
| Properties of the orbit ( animation ) | |
| Orbit type | Main outer belt asteroid |
| Major semi-axis | 3.0729 AU |
| eccentricity | 0.1331 |
| Perihelion - aphelion | 2.6638 AU - 3.4820 AU |
| Inclination of the orbit plane | 11.8134 ° |
| Length of the ascending node | 339.8477 ° |
| Argument of the periapsis | 341.1416 ° |
| Time of passage of the perihelion | 4th January 2018 |
| Sidereal period | 5.39 a |
| Mean orbital velocity | 16.99 km / s |
| Physical Properties | |
| Medium diameter | 17.991 km (± 0.141) |
| Albedo | 0.219 (± 0.029) |
| Absolute brightness | 10.99 likes |
| Spectral class | S. |
| history | |
| Explorer | Takeshi Urata |
| Date of discovery | March 12, 1978 |
| Another name | 1978 EA , 1937 RE, 1942 PG, 1951 EH, 1952 HA 4 , 1953 RT, 1953 TP, 1959 VD, 1964 TE, 1970 WV, 1978 EJ |
| Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items. | |
(2090) Mizuho is a main outer belt asteroid discovered on March 12, 1978 by the Japanese astronomer Takeshi Urata at JCPM Yakiimo Station in Shimizu , Shizuoka Prefecture ( IAU code 885). The discovery of (2090) Mizuho was the first asteroid discovery by an amateur astronomer in more than half a century. A 1994 article speculated that the discovery sparked a boom in asteroid discoveries by amateur astronomers in Japan.
There had been several sightings of the asteroid before: including in September 1937 under the provisional designation 1937 RE at the Crimean Observatory in Simejis , in August and September 1942 (1942 PG) at the Union Observatory in Johannesburg , on April 28, 1952 ( 1952 HA 4 ) at the McDonald Observatory in Texas , on September 6, 1953 (1953 RT) at the Palomar Observatory in California , from September to November 1953 (1953 TP) as well as on November 3, 1959 (1959 VD) and October 4 1964 (1964 TE) at the Goethe Link Observatory in Indiana and on November 26, 1970 (1970 WV) at the Crimean Observatory in Nautschnyj .
According to the spectral class (2090) Mizuho is assigned to the S asteroids .
The light curve of (2090) Mizuho was examined by James Bransfield on April 8-24, 2010 at the 36 cm Schmidt-Cassegrain telescope at the Via Capote Observatory in Thousand Oaks , California. The period of rotation was determined to be 5.47 hours, but the quality of the observations was not sufficient for a reliable value.
(2090) Mizuho is like the asteroids (95) Arethusa and (423) Diotima in a 1 + 3-1- orbital resonance with Jupiter and Saturn .
Mean distance from the Sun ( major semiaxis ), eccentricity and inclination of the orbit plane of (2090) Mizuho roughly correspond to the Eos family , a group of asteroids that typically have major semiaxes from 2.95 to 3.1 AU , bounded inward by the Kirkwood gap the 7: 3 resonance with Jupiter, and orbital inclinations between 8 ° and 12 °. The group is named after the asteroid (221) Eos . The family is believed to have emerged from a collision more than a billion years ago.
(2090) Mizuho was named after his daughter by Takeshi Urata on September 1, 1978.
See also
Web links
- (2090) Mizuho in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
- (2090) Mizuho in the Small-Body Database of the Jet Propulsion Laboratory .
- Discovery Circumstances of (2090) Mizuho according to the Minor Planet Center of the International Astronomical Union at the Harvard-Smithsonian Center for Astrophysics in Cambridge , Massachusetts (English)
Individual evidence
- ^ Lutz D. Schmadel : Dictionary of Minor Planet Names . 6th edition, Springer, Heidelberg 2014, Addendum p. 37f (English, limited preview in the Google book search)
- ↑ Hiroki Kōsai , Takeshi Urata, Tsuko Nakamura : Activities of Asteroid Studies of Amateur Astronomers , bibcode : 1994ASPC ... 63..297K . From: Yoshihide Kozai , Richard P. Binzel , Tomohiro Hirayama (editors): Seventy-Five Years of Hirayama Asteroid Families . ASP Conference Series, Vol 63, 1994. (English)
- ↑ (2090) Mizuho at the IAU Minor Planet Center (English)
- ↑ James Brinsfield: Asteroid Lightcurve Analysis at the Via Capote Observatory: 2010 February-May . The Minor Planet Bulletin, Vol. 37, No. 4, page 146f. bibcode : 2010MPBu ... 37..146B (English)
- ↑ Proper Elements from (2090) Mizuho in the AstDyS-2 database (English)
- ↑ David Vokrouhlický , Miroslav Brož , Alessandro Morbidelli , William Bottke , David Nesvorný , Daniel Lazzaro, Andy Rivkin: Yarkovsky footprints in the Eos family . (English, PDF ; 26 MB)