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3122 Florence (1981 ET3)
Classification: Amor [NEO, PHA]          SPK-ID: 2003122
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 564 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4229445969006566 6.523e-09  
a 1.768974947361122 4.151e-09 au
q 1.020796551322112 1.2364e-08 au
i 22.14249700076401 1.8571e-06 deg
node 336.0638557981181 1.2423e-06 deg
peri 27.84781900569795 4.7079e-06 deg
M 50.43779453821228 1.4191e-06 deg
tp 2458880.097768008873
(2020-Jan-31.59776801)
3.2218e-06 TDB
period 859.3715072923559
2.35
3.0248e-06
8.281e-09
d
yr
n .4189107934637737 1.4745e-09 deg/d
Q 2.517153343400132 5.9066e-09 au
  Orbit Determination Parameters
   # obs. used (total)      4645  
   # delay obs. used      6  
   # Doppler obs. used      0  
   data-arc span      15234 days (41.71 yr)  
   first obs. used      1979-03-09  
   last obs. used      2020-11-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .29034  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-23 05:22:00  

Additional Information
 Earth MOID = .0453329 au 
 Jupiter MOID = 2.99821 au 
 T_jup = 3.920 
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Orbital Elements at Epoch 2456507.5 (2013-Aug-03.0) TDB
Reference: JPL 564 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4227226789502855 6.452e-09  
q 1.020837326070504 1.2355e-08 au
tp 2456302.774537603101
(2013-Jan-10.27453760)
8.5035e-06 TDB
node 336.1243154228812 1.2377e-06 deg
peri 27.73637126104246 4.7081e-06 deg
i 22.16066011175392 1.8568e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      4645  
   # delay obs. used      6  
   # Doppler obs. used      0  
   data-arc span      15234 days (41.71 yr)  
   first obs. used      1979-03-09  
   last obs. used      2020-11-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .29034  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-23 05:22:00  

Additional Information
 Jupiter MOID = 2.99821 au 
 T_jup = 3.920 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.162841693968015E-17 -7.837487533397137E-17 3.160347397415288E-14 -3.983852019897278E-15 2.646950409870196E-14 -1.137620000085385E-15
q -7.837487533397137E-17 1.526444154926174E-16 -7.476967578303594E-14 7.469734219814174E-15 -5.284082799785843E-14 2.314411599265947E-15
tp 3.160347397415288E-14 -7.476967578303594E-14 7.231034446744595E-11 -1.961922527841831E-12 3.160116692089762E-11 -9.160878453346656E-13
node -3.983852019897278E-15 7.469734219814174E-15 -1.961922527841831E-12 1.531904423396475E-12 -2.395547022905799E-12 1.756971683606341E-12
peri 2.646950409870196E-14 -5.284082799785843E-14 3.160116692089762E-11 -2.395547022905799E-12 2.216667299999894E-11 -2.145135090383516E-12
i -1.137620000085385E-15 2.314411599265947E-15 -9.160878453346656E-13 1.756971683606341E-12 -2.145135090383516E-12 3.447643023781393E-12

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.1   n/a MPO452206  
diameter diameter 4.9 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543 based on assumed medium albedo (0.15)
rotation period rot_per 2.3581 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (1998) Icarus 136, 124-153.]
[Pravec, P.; Wolf, M.; Sarounova, L. (2002) http://www.asu.cas.cz/~ppravec/neo.htm]
[Pravec, P.; Wolf, M.; Sarounova, L. (2003) http://www.asu.cas.cz/~ppravec/neo.htm]
[Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Elenin, L.; Molotov, I. (2012) Minor Planet Bull. 39, 101-102.]
[Linder, T.; Sampson, R.; Holmes, R. (2013) Minor Planet Bull. 40, 4-6.]
[Warner, B.D. (2016) Minor Planet Bull. 43, 240-250.]
[Behrend, R. (2017) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Observers at Arecibo and/or Goldstone (2017) https://cneos.jpl.nasa.gov/news/news199.html]
[Stone, G. (2017) Posting on CALL web site: http://www.minorplanet.info/call.html]
[Franco, L.; Bacci, P.; Maestripieri, M.; Baj, G.; et al. (2018) Minor Planet Bull. 45, 174-177.]
[Klinglesmith III, D.A.; Hendrickx, S. (2018) Minor Planet Bull. 45, 61-63.]
[Rodrigo, O.: Fornas, G.; Arce, E.; Mas, V.; et al. (2018) Minor Planet Bull. 45, 120-121.]
[Tomassini, A.; Scardella, M.; Franceschini, F.; Pierri, F. (2018) Minor Planet Bull. 45, 11-13.]
[Warner, B.D. (2018) Minor Planet Bull. 45, 19-34.]
[Abrams, N.S.; Bieryla, A.; Gomez, S.; Huang, J.; et al. (2019) Minor Planet Bull. 46-4, in press.]
geometric albedo albedo 0.231   0.049 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  
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)

3122 Florence (1981 ET3)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1981 ET3 = 1983 CN1 
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