(61) Danae ( lat. Danae ) - an asteroid of the main belt , which belongs to the bright spectral class S. It was discovered on September 9, 1860 by the German astronomer German Goldschmidt using a 4-inch telescope located on the sixth floor of his apartment in the Latin Quarter of Paris , and named after Danai , mother of Perseus in Greek mythology [2] .
- The orbit of the asteroid Danae and its position in the solar system
(61) Danae  | |
|---|---|
| Asteroid | |
| Opening | |
| Discoverer | G. Goldschmidt |
| Place of discovery | Paris |
| Discovery date | September 9, 1860 |
| Eponym | Danae |
| Alternative notation | 1953 RL 1 ; A917 SM |
| Category | Main ring |
| Orbital characteristics | |
| Age of March 14, 2012 JD 2456000.5 | |
| Eccentricity ( e ) | 0,1681296 |
| Semimajor axis ( a ) | 445.904 million km (2,9806836 AU ) |
| Perihelion ( q ) | 370.934 million km (2.4795425 AU) |
| Aphelion ( Q ) | 520.874 million km (3.4818247 AU) |
| Circulation Period ( P ) | 1879.629 days (5.146 g. ) |
| Average orbital speed | 17.129 km / s |
| Inclination ( i ) | 18.21846 ° |
| Longitude node (Ω) | 333.74952 ° |
| Perihelion Argument (ω) | 13.05605 ° |
| Median Anomaly ( M ) | 133.95380 ° |
| Physical Characteristics [1] | |
| Diameter | 82.04 km |
| Weight | 3.2⋅10 17 kg |
| Density | 2,000 g / cm³ |
| Acceleration of gravity on the surface | 0.0126 m / s² |
| 2nd space speed | 0.0332 km / s |
| Rotation period | 11.45 h |
| Spectral class | S |
| Apparent magnitude | 13.03 m (current) |
| Absolute magnitude | 7.68 m |
| Albedo | 0.2224 |
| Average surface temperature | 155 K (−118 ° C ) |
| Current distance from the sun | 2,859 a. e. |
| Current distance from earth | 2.569 a. e. |
In 1985, based on data obtained from the planet’s light curve , a group of Italian astronomers suggested it had a satellite. According to initial calculations, its dimensions were to be 85 × 80 × 75 km. But it was experimentally established that its dimensions are 55 x 30 x 30 km, and the density is close to the Danai density. Its orbit is located 101 km from the asteroid [3] .
The average acceleration of gravity at the Danube equator is estimated at 1.26 cm / sec² , that is, gravity here is 776 times weaker than on Earth.
Danae is one of the last asteroids, in the official name of which diacritics are used , which were assigned only to planets and the very first asteroids, while astronomers still had no idea about the actual number of asteroids between the orbits of Mars and Jupiter. In astrology, the meaning of an asteroid symbol is such concepts as imprisonment , coin . This sign symbolizes the confinement of nature, communication with the higher, penetration through barriers.
Content
See also
- List of asteroids ( 1-100 )
- Classifications of Minor Planets
- Notation System Development
Notes
- ↑ Asteroid Data Sets
- ↑ Schmadel, Lutz D. Dictionary of Minor Planet Names . - Fifth Revised and Enlarged Edition. - B. , Heidelberg, N. Y .: Springer, 2003 .-- P. 21. - ISBN 3-540-00238-3 .
- ↑ Other Reports of Asteroid / TNO Companions
Literature
- A. Cellino, R. Pannunzio, W. Zappala , , and P. Paolicchi, 1985, Do we observe light curves of binary asteroids? , Astronomy and Astrophysics, Vol. 144, No. 2, pp. 355-362.
Links
- NASA JPL Database of Small Bodies in the Solar System (61 )
- MPC Small Body Solar System Database (61 )
- PDS Asteroid / Dust Archive
- Danae , New Astrological Encyclopedia