(41) Daphne ( lat. Daphne ) is a double asteroid of the main belt , which belongs to the dark spectral class C and may consist of simple carbonaceous chondrites . It was discovered on May 22, 1856 by the German astronomer Hermann Goldschmidt using a 4-inch telescope located on the sixth floor of his apartment in the Latin Quarter of Paris , and is named after the ancient Greek nymph Daphne , which Zeus turned into a bay tree [6] .
- The orbit of the asteroid Daphne and its position in the solar system
| (41) Daphne | |
|---|---|
 Asteroid (41) Daphne and his companion Pena | |
| Opening | |
| Discoverer | G. Goldschmidt |
| Detection point | Paris |
| Date of discovery | May 22, 1856 |
| Eponym | Daphne |
| Alternative designations | 1949 TG |
| Category | Main ring |
| Orbital characteristics | |
| The Age of March 14, 2012 JD 2456000.5 | |
| Eccentricity ( e ) | 0.2747869 |
| Semi-axis ( a ) | 412.949 million km (2,7603945 a. E.) |
| Perihelion ( q ) | 299.476 million km (2.0018743 a. E.) |
| Afhelia ( Q ) | 526.422 million km (3,5189147 a. E.) |
| Period of circulation ( P ) | 1675,156 days (4,586 g. ) |
| Average orbital speed | 17,583 km / s |
| Inclination ( i ) | 15.79250 ° |
| Ascending node longitude (Ω) | 178.09752 ° |
| Perihelion Argument (ω) | 46.09217 ° |
| Mean Anomaly ( M ) | 295.36549 ° |
| Asteroid satellite | S / 2008 (41) 1 |
| Physical characteristics [5] | |
| Diameter | 174.0 km ( IRAS ) 189.0 km [1] 213 × 160 km [2] 239x183x153 km [3] |
| Weight | 6.8⋅10 18 kg [4] |
| Density | 1,950 g / cm³ [3] |
| Acceleration of gravity on the surface | 0.0486 m / s² |
| 2nd cosmic speed | 0.0920 km / s |
| Rotation period | 5.988 h |
| Spectral class | C (Ch) |
| Apparent magnitude | 13.49 m (current) |
| Absolute magnitude | 7.12 m |
| Albedo | 0.0828 |
| Average surface temperature | 167 K (−106 ° C ) |
| Current distance from the Sun | 3,463 a. e. |
| Current distance from Earth | 3,613 a. e. |
In the 1990s, astronomers observed Daphne stars covering three times, and the resulting Daphne light curves suggested that the asteroid has an elongated shape close to an ellipsoid with a size of 213 × 160 km [2] .
Sputnik
The asteroid satellite (41) Daphne was discovered on March 28, 2008 and received the temporary designation S / 2008 (41) 1 [7] . March 6, 2019 he was named after Peney - the river god, father of the nymph Daphne. The satellite has a diameter of about 2 km and turns around the asteroid at a distance of about 443 km, with a period of 1.1 days [3] . The data on this binary system is preliminary, but if the fact of the presence of a satellite is confirmed, it will be one of the closest asteroid pairs in the solar system known to us [8] .
See also
- List of asteroids ( 1—100 )
- Small Planet Classifications
Notes
- ↑ Matter, Alexis; Marco Delbo, Sebastiano Ligori, Nicolas Crouzet, Paolo Tanga. Determination of physical properties of the asteroid (41) Daphne from interferometric observations of the thermal infrared (Eng.) // Icarus : journal. - Elsevier , 2011. - Vol. 215 , no. 1 . - p . 47-56 . - DOI : 10.1016 / j.icarus.2011.07.012 . - . - arXiv : 1108.2616 .
- ↑ 1 2 1999 European Asteroidal Occultation Results . euraster.net (a website for Asteroidal Occultation Observers in Europe) (February 9, 2009). The date of circulation is December 1, 2008. Archived on June 28, 2012. (1999-Jul-02 Chords)
- ↑ 1 2 3 Conrad, Al; Carry, B .; Drummond, JD; Merline, WJ; Dumas, C .; Owen, WM; Chapman, CR; Tamblyn, PM; Goodrich, RW; Campbell, RD Shape and Size of Asteroid (41) Daphne from AO Imaging (Eng.) // American Astronomical Society: journal. - 2008. - Vol. 40 , no. 28.12 . - P. 438 . - . Archived September 18, 2009.
- ↑ The volume of the ellipsoid with dimensions of 239 x 183 x 153 km * density of 1.95 g / cm³ gives a mass equal to 6.8⋅10 18 kg (m = d * v)
- ↑ Asteroid Data Sets (English)
- ↑ Schmadel, Lutz D. Dictionary of Minor Planet Names . - Fifth Revised and Enlarged Edition. - B. , Heidelberg, N. Y .: Springer, 2003. - P. 19. - ISBN 3-540-00238-3 .
- ↑ IAUC 8930: COMET P / 2006 B7 (ODAS); S / 2008 (41) 1; 196P; STEREO SPACECRAFT Neopr . IAU CBAT (March 31, 2008). The appeal date is March 31, 2008. Archived June 28, 2012.
- Ap Discovery of an Extreme Mass-Ratio Satellite of (41) Daphne in a Close Orbit . 2008]. The appeal date is October 13, 2011. Archived June 28, 2012.
Links
- NASA JPL Database on Small Bodies of the Solar System (41) (eng.)
- MPC Database on the Small Bodies of the Solar System (41) (eng.)
- Mike Nolan. Scheduled Arecibo Radar Asteroid Observations . Planetary Radar at Arecibo Observatory (January 18, 2012). The date of circulation is January 23, 2012. Archived on June 27, 2012.
- Radar-Detected Asteroids and Comets . NASA / JPL Asteroid Radar Research. The appeal date is January 23, 2012. Archived on May 25, 2012.