(385) Ilmatar ( Fin. Ilmatar ) - a large asteroid of the main belt , which belongs to the light spectral class S. It was discovered on March 1, 1894 by the German astronomer Max Wolf at the Heidelberg Observatory and named after the Finnish goddess Ilmatar , who was credited with the creation of the world [1] .
| (385) Ilmatar | |
|---|---|
| Asteroid | |
| Opening | |
| Discoverer | Max Wolf |
| Place of discovery | Heidelberg |
| Discovery date | March 1, 1894 |
| Eponym | Ilmatar |
| Alternative notation | 1894 AX ; 1942 FQ; 1953 TQ; 1987 QG 3 ; A918 CC |
| Category | Main ring |
| Orbital characteristics | |
| Age of April 18, 2013 JD 2456400.5 | |
| Eccentricity ( e ) | 0.1234133 |
| Semimajor axis ( a ) | 426.738 million km (2.8525699 AU ) |
| Perihelion ( q ) | 374.073 million km (2,5005248 AU) |
| Aphelion ( Q ) | 479.404 million km (3,204615 AU) |
| Circulation Period ( P ) | 1759.758 days (4.818 g. ) |
| Average orbital speed | 17.568 km / s |
| Inclination ( i ) | 13.54204 ° |
| Longitude node (Ω) | 345.09439 ° |
| Perihelion Argument (ω) | 187.39770 ° |
| Median Anomaly ( M ) | 281.40252 ° |
| physical characteristics | |
| Diameter | 91.53 km |
| Weight | 8.03⋅10 17 kg |
| Density | 2,000 g / cm³ |
| Acceleration of gravity on the surface | 0.0256 m / s² |
| 2nd space speed | 0.0484 km / s |
| Rotation period | 62.35 h |
| Spectral class | S |
| Apparent magnitude | 12.92 m (current) |
| Absolute magnitude | 7.49 m |
| Albedo | 0.2129 |
| Average surface temperature | 159 K (−114 ° C ) |
| Current distance from the sun | 2.578 a. e. |
| Current distance from earth | 3,055 a. e. |
The orbit of the asteroid Ilmatar and its position in the solar system
See also
- The list of asteroids ( 301-400 )
- Classifications of Minor Planets
Notes
- ↑ Schmadel, Lutz D. Dictionary of Minor Planet Names . - Fifth Revised and Enlarged Edition. - B. , Heidelberg, N. Y .: Springer, 2003 .-- P. 46. - ISBN 3-540-00238-3 .