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1056 Azalea - Wikipedia

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1056 Azalea
Discovery^[1]
Light curve-based 3D-model of 1056 Azalea
Discovered by	K. Reinmuth
Discovery site	Heidelberg Obs.
Discovery date	31 January 1924
Designations
MPC designation	(1056) Azalea
Pronunciation	/əˈzeɪliə/ ə-ZAY-lee-ə^[2]
Named after	Azalea (flower)^[3]
Alternative designations	1924 QD · 1925 NA 1929 WX
Minor planet category	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
Semi-major axis	2.2299 AU
Eccentricity	0.1784
Orbital period (sidereal)	3.33 yr (1,216 days)
Mean anomaly	226.32°
Mean motion	0° 17^m 45.6^s / day
Inclination	5.4267°
Longitude of ascending node	104.17°
Argument of perihelion	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]
Synodic rotation period	15.0276 h^[11] 15.03±0.05 h^[12] 15.15±0.03 h^[13]
Geometric albedo	0.223±0.024^[10] 0.24 (assumed)^[4] 0.2457±0.0401^[9] 0.292±0.040^[7] 0.34±0.16^[6]
Spectral type	SMASS = S^[1] · S^[4]
Absolute magnitude (H)	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]

Orbit and classification

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]

Physical characteristics

In the SMASS classification, Azalea is a common stony S-type asteroid.^[1]

Rotation period

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.

Spin axis

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]

Diameter and albedo

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]

Naming

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]

References

^ ^a ^b ^c ^d ^e ^f "JPL Small-Body Database Browser: 1056 Azalea (1924 QD)" (2017-04-30 last obs.). Jet Propulsion Laboratory. Retrieved 30 August 2017.
^ "azalea". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
^ ^a ^b ^c ^d Schmadel, Lutz D. (2007). "(1056) Azalea". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 90. doi:10.1007/978-3-540-29925-7_1057. ISBN 978-3-540-00238-3.
^ ^a ^b ^c ^d ^e ^f ^g "LCDB Data for (1056) Azalea". Asteroid Lightcurve Database (LCDB). Retrieved 30 August 2017.
^ ^a ^b "Asteroid 1056 Azalea – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 30 October 2019.
^ ^a ^b ^c ^d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63.
^ ^a ^b ^c ^d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 30 August 2017.
^ ^a ^b Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 30 August 2017.
^ ^a ^b ^c ^d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
^ ^a ^b ^c ^d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
^ ^a ^b Hanus, J.; Broz, M.; Durech, J.; Warner, B. D.; Brinsfield, J.; Durkee, R.; et al. (November 2013). "An anisotropic distribution of spin vectors in asteroid families". Astronomy and Astrophysics. 559: 19. arXiv:1309.4296. Bibcode:2013A&A...559A.134H. doi:10.1051/0004-6361/201321993. Retrieved 30 August 2017.
^ ^a ^b Kryszczynska, A.; Colas, F.; Polinska, M.; Hirsch, R.; Ivanova, V.; Apostolovska, G.; et al. (October 2012). "Do Slivan states exist in the Flora family?. I. Photometric survey of the Flora region". Astronomy and Astrophysics. 546: 51. Bibcode:2012A&A...546A..72K. doi:10.1051/0004-6361/201219199.
^ ^a ^b Behrend, Raoul. "Asteroids and comets rotation curves – (1056) Azalea". Geneva Observatory. Retrieved 30 August 2017.
^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 30 August 2017.
^ ^a ^b "1056 Azalea (1924 QD)". Minor Planet Center. Retrieved 30 August 2017.
^ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.

External links

Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
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
1056 Azalea at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
1056 Azalea at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

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