(618) Elfriede ( Latin Elfriede ) - an asteroid of the main belt , which belongs to the spectral class C. It was discovered on October 17, 1906 by the German astronomer Karl Lonert at the Heidelberg Observatory . The etymology of the name is unknown [1] .
- The orbit of the asteroid Elfrid and its position in the solar system
| (618) Elfrid | |
|---|---|
| Asteroid | |
| Opening | |
| Discoverer | Karl Lonert |
| Place of discovery | Heidelberg |
| Discovery date | October 17, 1906 |
| Alternative notation | 1906 VZ |
| Category | Main ring |
| Orbital characteristics | |
| Age of December 9, 2014 JD 2457000.5 | |
| Eccentricity ( e ) | 0,0737032 |
| Semimajor axis ( a ) | 477.09 million km (3,1891470 AU ) |
| Perihelion ( q ) | 441.927 million km (2.9540967 AU) |
| Aphelion ( Q ) | 512,253 million km (3,4241973 AU) |
| Circulation Period ( P ) | 2080.225 days (5.695 g. ) |
| Average orbital speed | 16.656 km / s |
| Inclination ( i ) | 17,03815 ° |
| Longitude node (Ω) | 111.07299 ° |
| Perihelion Argument (ω) | 228.27805 ° |
| Median Anomaly ( M ) | 37.97808 ° |
| Asteroid satellite | - |
| physical characteristics | |
| Diameter | 131,292 km |
| Rotation period | 14,795 h |
| Apparent magnitude | 12.5 m (current) |
| Absolute magnitude | 8.3 m |
| Albedo | 0,050 |
| Current distance from the sun | 2,986 a e. |
| Current distance from earth | 1,982 a e. |
Photometric observations made in 2008 at the Palmer Divide Observatory allowed us to obtain the light curves of this body, from which it followed that the period of rotation of the asteroid around its axis is 14.85 ± 0.01 hours, with a change in brightness as the rotation is 0.12 ± 0.02 m [2] .
On July 24, 2013, in some regions of Mexico and in the southwestern United States, one could observe asteroid coverage of the 2UCAC star 23949304, which had a brightness of 12 m of stellar magnitude [3] .
See also
- List of Asteroids (601-700)
- 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. 62. - ISBN 3-540-00238-3 .
- ↑ Carbo, Landy; Kragh, Katherine; Krotz, Jonathan & Meiers, Andrew (July 2009), "Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory and Oakley Observatory: 2008 September and October", The Minor Planet Bulletin T. 36 (3): 91–94
- ↑ Asteroid Occultation - (618) Elfriede (inaccessible link - history ) .
Links
- NASA's JPL Database of Small Bodies in the Solar System (618 )
- MPC Small Body Solar System Database (618 )
- Lightcurve plot of 618 Elfriede , Palmer Divide Observatory, BD Warner (2006)
- Asteroid Lightcurve Database (LCDB) , query form ( info )
- Asteroids and comets rotation curves, CdR - Observatoire de Genève, Raoul Behrend