1511 Daléra

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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. ↑ 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. ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ 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. ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
  7. ↑ 7.0 7.1 Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.

External links


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