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Light curve-based 3D-model of 1056 Azalea | |
Discovery [1] | |
---|---|
Discovered by | K. Reinmuth |
Discovery site | Heidelberg Obs. |
Discovery date | 31 January 1924 |
Designations | |
(1056) Azalea | |
Pronunciation | /əˈzeɪliə/ [2] |
Named after | Azalea (flower) [3] |
1924 QD · 1925 NA 1929 WX | |
main-belt · (
inner) Flora [4] [5] | |
Orbital characteristics [1] | |
Epoch 4 September 2017 ( JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 93.24 yr (34,057 days) |
Aphelion | 2.6277 AU |
Perihelion | 1.8321 AU |
2.2299 AU | |
Eccentricity | 0.1784 |
3.33 yr (1,216 days) | |
226.32 ° | |
0° 17m 45.6s / day | |
Inclination | 5.4267° |
104.17° | |
212.39° | |
Physical characteristics | |
Dimensions | 10.66±1.99 km
[6] 11.76±0.54 km [7] 11.869±0.136 km [8] 12.40 km (calculated) [4] 12.984±0.069 km [9] 13.07±0.64 km [10] |
15.0276
h
[11] 15.03±0.05 h [12] 15.15±0.03 h [13] | |
0.223±0.024
[10] 0.24 (assumed) [4] 0.2457±0.0401 [9] 0.292±0.040 [7] 0.34±0.16 [6] | |
SMASS = S [1] · S [4] | |
11.60 [7] [9] · 11.70 [1] [4] [10] · 11.73±0.28 [14] · 11.83 [6] | |
1056 Azalea, provisional designation 1924 QD, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 12 kilometers in diameter. It was discovered on 31 January 1924, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. [15] The asteroid is named after the Azalea flower. [3]
Azalea is a member of the Flora family ( 402), a giant asteroid family and the largest family of stony asteroids in the main belt. [4] [5] [16]: 23 It orbits the Sun in the inner main belt at a distance of 1.8–2.6 AU once every 3 years and 4 months (1,216 days). Its orbit has an eccentricity of 0.18 and an inclination of 5 ° with respect to the ecliptic. [1] The body's observation arc begins at Heidelberg in April 1928, more than 4 years after its official discovery observation. [15]
In the SMASS classification, Azalea is a common stony S-type asteroid. [1]
In 2004, two rotational lightcurves of Azalea were obtained from photometric observations by a group of predominately Polish astronomers including Agnieszka Kryszczyńska, as well as by astronomers Alain Klotz and Raoul Behrend. Lightcurve analysis gave a rotation period of 15.03 and 15.15 hours with a high brightness variation of 0.70 and 0.79 magnitude, respectively ( U=2/2). [12] [13] The high brightness amplitude is typically indicative for a non- spheroidal shape.
In 2013, an international study modeled a lightcurve with a concurring period of 15.0276 hours and found two spin axis of (252.0°, 51.0°) and (64.0°, 41.0°) in ecliptic coordinates (λ, β) ( U=n.a.). [11]
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Azalea measures between 10.66 and 13.07 kilometers in diameter and its surface has an albedo between 0.223 and 0.34. [6] [7] [8] [9] [10]
The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of the Flora family – and calculates a diameter of 12.40 kilometers based on an absolute magnitude of 11.7. [4]
This minor planet was named after the genus of flowering shrubs, Azalea, which are rhododendrons with funnel-shaped corollas. [3] The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 ( H 100). [3]