(351) Yrsa ( Nor. Yrsa ) is a fairly large asteroid of the main belt , which belongs to the bright spectral class S. It was discovered on December 16, 1892 by German astronomer Max Wolf at the Heidelberg Observatory in Germany and named after the heroine of Scandinavian legends [1] .
| (351) Irsa | |
|---|---|
| Asteroid | |
| Opening | |
| Discoverer | Max wolf |
| Detection point | Heidelberg |
| Date of discovery | December 16, 1892 |
| Alternative designations | 1892 V ; 1927 OB; 1950 PD 1 ; 1959 LN |
| Category | Main ring |
| Orbital characteristics | |
| The Age of September 30, 2012 JD 2456200.5 | |
| Eccentricity ( e ) | 0.1529116 |
| Semi-axis ( a ) | 413.916 million km (2,7668576 a. E.) |
| Perihelion ( q ) | 350.623 million km (2,343773 a. E.) |
| Afhelia ( Q ) | 477,209 million km (3.1899422 a. E.) |
| Period of circulation ( P ) | 1681.042 days (4.602 g. ) |
| Average orbital speed | 17,801 km / s |
| Inclination ( i ) | 9.19602 ° |
| Ascending node longitude (Ω) | 99.26989 ° |
| Perihelion Argument (ω) | 31.19327 ° |
| Mean Anomaly ( M ) | 340.44194 ° |
| physical characteristics | |
| Diameter | 39.59 km |
| Weight | 6.5⋅10 16 kg |
| Density | 2,000 g / cm³ |
| Acceleration of gravity on the surface | 0,0111 m / s² |
| 2nd cosmic speed | 0.0209 km / s |
| Rotation period | 13.29 hours |
| Spectral class | S |
| Apparent magnitude | 13.51 m (current) |
| Absolute magnitude | 8.98 m |
| Albedo | 0.2884 |
| Average surface temperature | 160 K (−113 ° C ) |
| Current distance from the Sun | 3.154 a. e. |
| Current distance from Earth | 2,154 a. e. |
Orbit of the asteroid Irs and its position in the solar system
See also
- List of asteroids ( 301-400 )
- Small Planet Classifications
Notes
- ↑ Schmadel, Lutz D. Dictionary of Minor Planet Names . - Fifth Revised and Enlarged Edition. - B. , Heidelberg, N. Y .: Springer, 2003. - P. 44. - ISBN 3-540-00238-3 .