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JPL Small-Body Database Browser
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321 Florentina
Classification: Main-belt Asteroid          SPK-ID: 2000321
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04666053706193093 3.5652e-08  
a 2.885377376068378 1.1403e-08 au
q 2.750744118074682 1.047e-07 au
i 2.587287565963579 4.3842e-06 deg
node 40.22458690232654 9.522e-05 deg
peri 36.24914656531664 0.00010818 deg
M 323.2149041460748 5.11e-05 deg
tp 2458783.424447291555
(2019-Oct-26.92444729)
0.00025422 TDB
period 1790.203328175723
4.90
1.0613e-05
2.906e-08
d
yr
n .2010944758810453 1.1921e-09 deg/d
Q 3.020010634062073 1.1935e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2725  
   data-arc span      46234 days (126.58 yr)  
   first obs. used      1893-01-16  
   last obs. used      2019-08-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44849  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-23 19:07:32  

Additional Information
 Earth MOID = 1.76614 au 
 Jupiter MOID = 2.09894 au 
 T_jup = 3.290 
[ 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-January); 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          Discovered 1891-Oct-15 by Palisa, J. at Vienna
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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