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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 635 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4231600896646802 5.8969e-09  
a 1.76884198167437 3.8389e-09 au
q 1.020338650106393 1.0894e-08 au
i 22.1451003915884 1.8495e-06 deg
node 336.0636516259496 1.2347e-06 deg
peri 27.85235836026234 3.9322e-06 deg
M 216.3086285839428 1.7568e-06 deg
tp 2459739.473189127394
(2022-Jun-08.97318913)
5.0967e-06 TDB
period 859.2746166250602
2.35
2.7973e-06
7.659e-09
d
yr
n .4189580292898191 1.3639e-09 deg/d
Q 2.517345313242347 5.4634e-09 au
  Orbit Determination Parameters
   # obs. used (total)      5046  
   # delay obs. used      6  
   # Doppler obs. used      0  
   data-arc span      15455 days (42.31 yr)  
   first obs. used      1979-03-09  
   last obs. used      2021-07-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .29933  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-10 06:26:51  

Additional Information
 Earth MOID = .0441469 au 
 Jupiter MOID = 2.99939 au 
 T_jup = 3.920 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457081.5 (2015-Feb-28.0) TDB
Reference: JPL 635 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4227837217266816 5.7772e-09  
q 1.020711750472532 1.0792e-08 au
tp 2457161.496167984617
(2015-May-18.99616798)
4.8672e-06 TDB
node 336.1210025872444 1.2304e-06 deg
peri 27.70127320381222 3.9367e-06 deg
i 22.16273672314756 1.8491e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      5046  
   # delay obs. used      6  
   # Doppler obs. used      0  
   data-arc span      15455 days (42.31 yr)  
   first obs. used      1979-03-09  
   last obs. used      2021-07-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .29933  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-10 06:26:51  

Additional Information
 Jupiter MOID = 2.99939 au 
 T_jup = 3.920 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.33759738918808E-17 -6.109118247204499E-17 1.663790255873542E-14 -3.635956800444466E-15 1.907682878863287E-14 -9.275515382808577E-16
q -6.109118247204499E-17 1.164770292833615E-16 -3.823454147927555E-14 6.740244661544692E-15 -3.732408559297848E-14 1.871029147555921E-15
tp 1.663790255873542E-14 -3.823454147927555E-14 2.368959222661969E-11 -1.040429308920554E-12 1.587066729679363E-11 -2.877081718581144E-13
node -3.635956800444466E-15 6.740244661544692E-15 -1.040429308920554E-12 1.513892348255484E-12 -2.076582635069174E-12 1.740104096769068E-12
peri 1.907682878863287E-14 -3.732408559297848E-14 1.587066729679363E-11 -2.076582635069174E-12 1.549753930904125E-11 -1.935377952678701E-12
i -9.275515382808577E-16 1.871029147555921E-15 -2.877081718581144E-13 1.740104096769068E-12 -1.935377952678701E-12 3.419175943221766E-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 14.04   n/a MPO636110  
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. 2020-October); 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. (2020) Minor Planet Bull. 47, 3-4.]
[Ferrais, M.; Jehin, E.; Moulane, Y.; Pozuelos, Francisco J.; et al. (2020) Minor Planet Bull. 47, 21-22.]
[Núñez-López, R.; Loera-González, P.; Saucedo, J.C.; Olguín, L.; Contreras, M.E. (2020) Minor Planet Bull. 47, 89-90.]
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 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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