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Stony Florian asteroid From Wikipedia, the free encyclopedia
1405 Sibelius, provisional designation 1936 RE, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 12 September 1936, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland.[11] The asteroid was named after composer Jean Sibelius.[2]
Discovery[1] | |
---|---|
Discovered by | Y. Väisälä |
Discovery site | Turku Obs. |
Discovery date | 12 September 1936 |
Designations | |
(1405) Sibelius | |
Named after | Jean Sibelius (Finnish composer)[2] |
1936 RE · 1951 CO 1953 VK3 · 1963 ST | |
main-belt · Flora[3] | |
Orbital characteristics[1] | |
Epoch 4 September 2017 (JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 66.40 yr (24,254 days) |
Aphelion | 2.5817 AU |
Perihelion | 1.9215 AU |
2.2516 AU | |
Eccentricity | 0.1466 |
3.38 yr (1,234 days) | |
312.34° | |
0° 17m 30.12s / day | |
Inclination | 7.0301° |
312.08° | |
95.795° | |
Physical characteristics | |
Dimensions | 6.21±0.35 km[4] 6.810±0.098 km[5] 7.175±0.089 km[6] 7.20 km (taken)[3] 7.204 km[7] 9.26±1.95 km[8] 12.18±1.1 km[9] |
6.051±0.001 h[lower-alpha 1][lower-alpha 2] | |
0.1432±0.029[9] 0.27±0.15[8] 0.3191[7] 0.3516±0.0646[6] 0.388±0.040[5] 0.458±0.068[4] | |
S[3][10] | |
12.03 (R)[lower-alpha 1] · 12.3[9] · 12.48[6] · 12.5[1][4][8] · 12.57±0.078[3][7] · 12.57±0.33[10] | |
Sibelius is a member of the Flora family, one of the largest populations of stony asteroids in the entire main-belt. It orbits the Sun in the inner main-belt at a distance of 1.9–2.6 AU once every 3 years and 5 months (1,234 days). Its orbit has an eccentricity of 0.15 and an inclination of 7° with respect to the ecliptic.[1] The body's observation arc begins with an observation taken at Turku two weeks prior to its official discovery observation.[11]
Sibelius has been characterized as an S-type asteroid by Pan-STARRS photometric survey.[10]
In October 2007, a rotational lightcurve of Sibelius was obtained from photometric observations taken by Petr Pravec at the Ondřejov Observatory in the Czech Republic. Lightcurve analysis gave a rotation period of 6.051 hours with a brightness variation of 0.11 magnitude (U=3-).[lower-alpha 1][lower-alpha 2]
According to the surveys carried out by the Infrared Astronomical Satellite IRAS and NASA's Wide-field Infrared Survey Explorer (WISE) with its subsequent NEOWISE mission, Sibelius measures between 6.21 and 12.18 kilometers in diameter and its surface has an albedo between 0.14 and 0.48.[4][5][6][8][9] The Collaborative Asteroid Lightcurve Link adopts an albedo of 0.3191 and a diameter of 7.20 kilometers from Petr Pravec's revised WISE thermal observations.[3][7]
This minor planet was named for Jean Sibelius (1865–1957), Finnish violinist and composer of the late Romantic and early-modern periods.[2] The official naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3928).[12]
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