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321 Florentina (A891 TC)
Classification: Main-belt Asteroid          SPK-ID: 2000321
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04679244485386126 3.5353e-08  
a 2.885722256627909 1.0701e-08 au
q 2.750692257071087 1.0329e-07 au
i 2.586854696146607 4.1431e-06 deg
node 40.21613348394306 9.1034e-05 deg
peri 35.953064879239 0.00010303 deg
M 43.92163342925447 4.7231e-05 deg
tp 2458782.047910726862
(2019-Oct-25.54791073)
0.00023496 TDB
period 1790.524304270271
4.90
9.9594e-06
2.727e-08
d
yr
n .2010584269319472 1.1183e-09 deg/d
Q 3.020752256184731 1.1202e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3014  
   data-arc span      46484 days (127.27 yr)  
   first obs. used      1893-01-16  
   last obs. used      2020-04-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43185  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:03:07  

Additional Information
 Earth MOID = 1.76623 au 
 Jupiter MOID = 2.09774 au 
 T_jup = 3.289 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.1   n/a MPO365244  
diameter diameter 27.974 km 0.103 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 2.871 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Van Houten-Groeneveld, I.; van Houten, C.J. (1958) Astrophys. J. 127, 253-273.]
[Slivan, S.M.; Binzel, R.P. (1996) Icarus 124, 452-470.]
[Behrend, R. (1999) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Frey, G. (2000) Minor Planet Bull. 27, 29-30; Proc. 2000 IAPPP Phot. and CCD Imaging Symp., 1-12.]
[Slivan, S.M.; Binzel, R.P.; Crespo da Silva, L.D.; Kaasalainen, M.; et al. (2003) Icarus 162, 285-307.]
[Warner, B.D. (2006) Minor Planet Bull. 33, 39-41.]
[Fauvaud, S.; Fauvuad, M.; Richard, F. (2011) Minor Planet Bull. 38, 134-135.]
geometric albedo albedo 0.425   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.792   0.036 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=1.44, mean=5.02, max.=10.60) deg.
U-B UB 0.410   0.044 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=1.44, mean=5.02, max.=10.60) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

321 Florentina (A891 TC)          Discovered 1891-Oct-15 by Palisa, J. at Vienna
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A891 TC = 1959 RS 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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