321 Florentina

321 Florentina
	A three-dimensional model of 321 Florentina based on its light curve
Discovery
Discovered by	Johann Palisa
Discovery date	15 October 1891
Designations
MPC designation	(321) Florentina
Pronunciation	/flɒrənˈtaɪnə/
Minor planet category	Main belt (Koronis)
Orbital characteristics
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	118.15 yr (43153 d)
Aphelion	3.01879 AU (451.605 Gm)
Perihelion	2.7543 AU (412.04 Gm)
Semi-major axis	2.88657 AU (431.825 Gm)
Eccentricity	0.045806
Orbital period (sidereal)	4.90 yr (1,791.3 d)
Mean anomaly	120.99°
Mean motion	0° 12m 3.492s / day
Inclination	2.5876°
Longitude of ascending node	40.224°
Argument of perihelion	37.310°
Physical characteristics
Dimensions	27.23±1.5 km
Synodic rotation period	2.871 h (0.1196 d)
Geometric albedo	0.2296±0.028
Absolute magnitude (H)	10.1

321 Florentina is an S-type (stony) main belt asteroid with a diameter of 28 km.^[2] It was discovered by Johann Palisa on 15 October 1891 in Vienna. He named the asteroid for his daughter, Florentine.^[3] Between 1874 and 1923, Palisa discovered a total of 122 asteroids.

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This asteroid is a dynamic member of the Koronis family. It is orbiting the Sun at a distance of 2.887 AU with an eccentricity (ovalness) of 0.046 and an orbital period of 4.90 yr. The orbital plane is inclined at an angle of 2.59° to the plane of the ecliptic.^[1] Photometric data collected during the asteroid opposition of 2011 was used to construct a light curve that displayed a rotation period of 2.870±0.001 h. This is consistent with previous rotation estimates.^[2]

A group of astronomers, including Lucy d'Escoffier Crespo da Silva, contributed data toward the discovery of spin-vector alignments in the Koronis family, which includes (321) Florentina. This was based on observations made between 1998 through 2000. The collaborative work resulted in the creation of 61 new individual rotation lightcurves to augment previous published observations.^[4]

[1]
"321 Florentina". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 11 May 2016.
[2]
Fauvaud, Stéphane; Fauvaud, Marcel; Richard, Franck (July 2011). "Photometric Observations of 321 Florentina". Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers. 38 (3): 134–135. Bibcode:2011MPBu...38..134F.
[3]
Schmadel, Lutz D. (2007). "(321) Florentina". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 42. doi:10.1007/978-3-540-29925-7_322. ISBN 978-3-540-00238-3.
[4]
Slivan, S. M.; Binzel, R. P.; Crespo da Silva, L. D.; Kaasalainen, M.; Lyndaker, M. M.; Krco, M. (2003). "Spin vectors in the Koronis family: comprehensive results from two independent analyses of 213 rotation lightcurves". Icarus. 162: 285–307. Bibcode:2003Icar..162..285S. doi:10.1016/S0019-1035(03)00029-0.