(277) Elvira
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Asteroid (277) Elvira |
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| A three-dimensional model of (277) Elvira based on her light curve | |
| Properties of the orbit ( animation ) | |
| Orbit type | Outer main belt |
| Asteroid family | Koronis family |
| Major semi-axis | 2,887 AU |
| eccentricity | 0.088 |
| Perihelion - aphelion | 2.633 AU - 3.141 AU |
| Inclination of the orbit plane | 1.2 ° |
| Length of the ascending node | 231.6 ° |
| Argument of the periapsis | 136.6 ° |
| Time of passage of the perihelion | December 10, 2012 |
| Sidereal period | 4 a 330 d |
| Mean orbital velocity | 17.5 km / s |
| Physical Properties | |
| Medium diameter | 27 km |
| Albedo | 0.2770 |
| Rotation period | 29 h 41 min |
| Absolute brightness | 9.84 mag |
| Spectral class | S. |
| history | |
| Explorer | A. Charlois |
| Date of discovery | May 3, 1888 |
| Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items. | |
(277) Elvira is an asteroid of the main asteroid belt that was discovered on May 3, 1888 by Auguste Charlois at the Observatory of Nice . It is probably named after a figure in Alphonse de Lamartine's Méditations poétiques (1820) and Harmonies poétiques et religieuses (1830).
(277) Elvira moves at a distance of 2.6307 ( perihelion ) to 3.1425 ( aphelion ) astronomical units in 4.9043 years around the sun . The orbit is 1.1556 ° inclined to the ecliptic , the orbital eccentricity is 0.0886.
(277) Elvira is 27 kilometers in diameter. It has a light surface with an albedo of 0.277. It rotates on its own axis in around 29 hours and 41 minutes.
It belongs to the Koronis - asteroid family , a group of asteroids that after (158) Koronis is named.
A group of astronomers, including Lucy d'Escoffier Crespo da Silva and Richard P. Binzel , used observations from 1998 to 2000 to determine the spin-vector alignment of these asteroids, including (277) Elvira. The joint work resulted in the development of 61 new individual rotating light curves to complement previously published observations.
Measurements of the thermal inertia of (277) Elvira gave a value of approx. 190 J / (m 2 · K 1 · s 1/2 ) compared to a value of 50 for lunar regolith and 400 for coarse sand in an environment with one atmosphere.
See also
Individual evidence
- ^ Lutz D. Schmadel: Dictionary of Minor Planet Names . 5th edition. Springer, 2003, ISBN 3-540-00238-3 (English).
- ↑ Slivan, SM, Binzel, RP, Crespo da Silva, LD, Kaasalainen, M., Lyndaker, MM, Krco, M .: Spin vectors in the Koronis family: comprehensive results from two independent analyzes of 213 rotation lightcurves . In: Icarus . No. 162 , 2003, p. 285–307 , bibcode : 2003Icar..162..285S (English).
- ↑ Marco Delbo ', Paolo Tanga: Thermal inertia of main belt asteroids smaller than 100 km from IRAS data . In: Planetary and Space Science . No. 57 (2) , February 2009, p. 259–265 , doi : 10.1016 / j.pss.2008.06.015 , arxiv : 0808.0869 , bibcode : 2009P & SS ... 57..259D (English).