(48) Doris ( lat. Doris ) is a dark asteroid of the main belt , which belongs to the dark spectral class C. It was discovered on September 19, 1857 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 the nymph Dorida , daughter of the titan Ocean and Tefida according to ancient Greek mythology [6] .
| (48) Dorida | |
|---|---|
| Asteroid | |
| Opening | |
| Discoverer | G. Goldschmidt |
| Place of discovery | Paris |
| Discovery date | September 19, 1857 |
| Eponym | Dorida |
| Alternative notation | 1948 FE |
| Category | Main ring |
| Orbital characteristics | |
| Age of March 14, 2012 JD 2456000.5 | |
| Eccentricity ( e ) | 0,0752416 |
| Semimajor axis ( a ) | 465.817 million km (3,1137924 AU ) |
| Perihelion ( q ) | 430.768 million km (2,8795057 AU) |
| Aphelion ( Q ) | 500.866 million km (3.3480791 AU) |
| Circulation Period ( P ) | 2006.933 days (5.495 g. ) |
| Average orbital speed | 16.855 km / s |
| Inclination ( i ) | 6.55255 ° |
| Longitude node (Ω) | 183.73304 ° |
| Perihelion Argument (ω) | 255.07634 ° |
| Median Anomaly ( M ) | 320.31853 ° |
| Physical Characteristics [4] [5] | |
| Diameter | 221.80 km ( IRAS ) 278 × 142 km [1] |
| Weight | 1.7⋅10 19 kg [2] [3] |
| Density | 2.1 ... 3.1 g / cm³ |
| Acceleration of free fall on the surface | 0.0620 m / s² |
| 2nd space speed | 0.1173 km / s |
| Rotation period | 11.89 h |
| Spectral class | C (Ch) |
| Apparent magnitude | 12.96 m (current) |
| Absolute magnitude | 6.9 m |
| Albedo | 0.0624 |
| Average surface temperature | 158 K (−115 ° C ) |
| Current distance from the sun | 3.11 a. e. |
| Current distance from earth | 3,952 a e. |
Asteroid coverage of stars was observed twice. For the first time on March 19, 1981 , when the asteroid diameter was determined as 219 ± 25 km [7] , and the second time on October 14, 1999 , then the ellipsoidal shape of the asteroid was determined using the chord method , and its size was estimated at 278 × 142 km [1] .
It is important to note that, as expected, in June 2132, Dorida will pass only 0.019 a. e. (2.85 million km) from the asteroid (2) Pallas [8] .
See also
- List of asteroids ( 1-100 )
- Classifications of Minor Planets
Notes
- ↑ 1 2 Occultation of HIP 29126 by (48) Doris - 2001 November 28 (unreachable link) . Royal Astronomical Society of New Zealand. Date of treatment November 30, 2008. Archived June 5, 2012.
- ↑ Michalak, G. Determination of asteroid masses (Eng.) // Astronomy and Astrophysics . - EDP Sciences , 2001. - Vol. 374 . - P. 703-711 . - DOI : 10.1051 / 0004-6361: 20010731 . - .
- ↑ (Mass estimate of Doris 0.09 / Mass of Ceres 4.75) * Mass Ceres 9.43E + 20 = 1.786E + 19
- ↑ Asteroid Data Sets
- ↑ Asteroid Data Archive (inaccessible link) . Planetary Science Institute. Date of treatment November 3, 2008. Archived June 23, 2006.
- ↑ 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 .
- ↑ Ludek Vasta, Jan Manek. Observed Minor Planet Occultation Events . Asteroidal Occultations (Czech Astronomical Society) (July 26, 2005). Date of treatment December 7, 2008. Archived June 9, 2012.
- ↑ JPL Close-Approach Data: 48 Doris (2009-08-11 last obs). Date of treatment February 23, 2010. Archived June 9, 2012.