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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 559 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4229445910453244 6.5386e-09  
a 1.768974947335498 4.1587e-09 au
q 1.020796561665261 1.24e-08 au
i 22.14249624858464 1.8572e-06 deg
node 336.0638555801969 1.2425e-06 deg
peri 27.84781486656305 4.7255e-06 deg
M 50.43779606820457 1.4199e-06 deg
tp 2458880.097764359179
(2020-Jan-31.59776436)
3.2247e-06 TDB
period 859.3715072736836
2.35
3.0305e-06
8.297e-09
d
yr
n .4189107934728757 1.4772e-09 deg/d
Q 2.517153333005735 5.9176e-09 au
  Orbit Determination Parameters
   # obs. used (total)      4618  
   # delay obs. used      6  
   # Doppler obs. used      0  
   data-arc span      14805 days (40.53 yr)  
   first obs. used      1979-03-09  
   last obs. used      2019-09-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .28997  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-21 05:56:08  

Additional Information
 Earth MOID = .0453329 au 
 Jupiter MOID = 2.99821 au 
 T_jup = 3.920 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456473.5 (2013-Jun-30.0) TDB
Reference: JPL 559 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4227045972297981 6.4708e-09  
q 1.020907038094127 1.2396e-08 au
tp 2456302.774857013711
(2013-Jan-10.27485701)
8.5312e-06 TDB
node 336.1254382911112 1.2381e-06 deg
peri 27.74055149937112 4.726e-06 deg
i 22.15981679881958 1.8569e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      4618  
   # delay obs. used      6  
   # Doppler obs. used      0  
   data-arc span      14805 days (40.53 yr)  
   first obs. used      1979-03-09  
   last obs. used      2019-09-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .28997  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-21 05:56:08  

Additional Information
 Jupiter MOID = 2.99821 au 
 T_jup = 3.920 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.187135517304392E-17 -7.887304717869983E-17 3.193737790727683E-14 -3.99567995373936E-15 2.66710862218647E-14 -1.142542564247596E-15
q -7.887304717869983E-17 1.536703185022777E-16 -7.546252792578987E-14 7.493321140157562E-15 -5.32547514908539E-14 2.323318141377979E-15
tp 3.193737790727683E-14 -7.546252792578987E-14 7.278057426190272E-11 -1.978515204128084E-12 3.188078934781219E-11 -9.251771772786698E-13
node -3.99567995373936E-15 7.493321140157562E-15 -1.978515204128084E-12 1.53278818110284E-12 -2.406238336188445E-12 1.757512443210422E-12
peri 2.66710862218647E-14 -5.32547514908539E-14 3.188078934781219E-11 -2.406238336188445E-12 2.233487867481049E-11 -2.151066811206221E-12
i -1.142542564247596E-15 2.323318141377979E-15 -9.251771772786698E-13 1.757512443210422E-12 -2.151066811206221E-12 3.447928942257287E-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

[ show close-approach data ]
Alternate Designations
 1981 ET3 = 1983 CN1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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