1511 Daléra
Discovery [1] | |
---|---|
Discovered by | L. Boyer |
Discovery site | Algiers Observatory |
Discovery date | 22 March 1939 |
Designations | |
MPC designation | 1511 Dalera |
Named after
|
Paul Daléra (friend of discoverer)[2] |
1939 FB · 1928 DB 1954 LM |
|
main-belt · (inner) [3] | |
Orbital characteristics [1] | |
Epoch 27 June 2015 (JD 2457200.5) | |
Uncertainty parameter 0 | |
Observation arc | 87.31 yr (31,891 days) |
Aphelion | 2.6137 AU |
Perihelion | 2.1012 AU |
2.3574 AU | |
Eccentricity | 0.1086 |
3.62 yr (1,322 days) | |
17.960° | |
Inclination | 4.0689° |
81.740° | |
97.254° | |
Physical characteristics | |
Dimensions | 15.47 km (IRAS)[1] 7.15 km (calculated)[3] 12±5 km (convert. mag.)[4] |
3.880 h[5][6] 4.2227±0.0011 h[7] |
|
0.0614 (IRAS)[1] 0.20 (assumed)[3] |
|
S [3] | |
12.8 (IRAS)[1] 13.09 (transformed)[3][lower-alpha 1] |
|
1511 Daléra, provisional designation 1939 FB, is a stony asteroid from the inner regions of the asteroid belt, about 8 kilometers in diameter. It was discovered by French astronomer Louis Boyer at the Algerian Algiers Observatory, North Africa, on 22 March 1939.[8]
The S-type asteroid orbits the Sun at a distance of 2.1–2.6 AU once every 3 years and 7 months (1,322 days). Its orbit shows an eccentricity of 0.11 and is tilted by 4 degrees to the plane of the ecliptic. It has a rotation period of 3.9 and 4.2 hours, determined by independent observations in 2015, respectively.[5][6][7]
Based on NASA's magnitude-to-diameter conversion table, and on a absolute magnitude of 12.8, its diameter could be anywhere between 7 and 17 kilometers, assuming an albedo in the range of 0.05 to 0.25.[4] Data from the Infrared Astronomical Satellite, IRAS, gave a large diameter of 15 kilometers, based on a corresponding low albedo of 0.06, which is typical for dark asteroids with a carbonaceous composition.[3] However, the Collaborative Asteroid Lightcurve Link (CALL) calculates the body's diameter to be much smaller, about 7 kilometers in diameter, using a transformed absolute magnitude of 13.1 and an assumed, higher albedo of 0.20, which is a typical value for silicaceous asteroids, that are abundant in the inner main-belt.[3][lower-alpha 1] In general, estimates of an asteroid's size are commonly based on the body's brightness. For a given absolute magnitude, the lower the body's reflectivity (albedo), the larger its calculated diameter.
The minor planet was named after Paul Daléra, a friend of Louis Boyer.[2]
References
- ↑ 1.0 1.1 Collaborative Asteroid Lightcurve Link – using a transformed absolute magnitude. Explanation: a transformed absolute magnitude is used only in those cases where the adopted H value is based on a details line but the reported value in that line was not in the V band. When no color index is available, the default color indices V-R 0.45, B-V 0.80, and V-r' 0.23 are used to convert H_R and H_B to H_V. Summary figures and README.txt file at Collaborative Asteroid Lightcurve Link (CALL) for (1511) Dalera
- ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 7.0 7.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 1511 Daléra at the JPL Small-Body Database
<templatestyles src="Asbox/styles.css"></templatestyles>