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

[ show orbit diagram ]
Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 349 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .422769565435019 6.6765e-08  
a 1.768823269620517 4.7111e-09 au
q 1.021018624591702 1.1823e-07 au
i 22.15569378165955 6.8507e-06 deg
node 336.1165920425035 9.6081e-06 deg
peri 27.76532044438333 1.1544e-05 deg
M 183.8640588203735 1.1206e-05 deg
tp 2458020.907615891473
(2017-Sep-24.40761589)
2.7829e-05 JED
period 859.2609816447646
2.35
3.4328e-06
9.398e-09
d
yr
n .4189646774265273 1.6738e-09 deg/d
Q 2.516627914649332 6.7028e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1926  
   data-arc span      13568 days (37.15 yr)  
   first obs. used      1979-03-09  
   last obs. used      2016-05-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49265  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-May-02 05:48:00  

Additional Information
 Earth MOID = .0445802 au 
 Jupiter MOID = 2.98917 au 
 T_jup = 3.920 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.1 mag n/a MPO259359  
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. 2016-February); 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 Bul. 39, 101-102.]
[Linder, T.; Sampson, R.; Holmes, R. (2013) Minor Planet Bul. 40, 4-6.]
[Warner, B.D. (2016) http://www.minorplanetobserver.com/PDO/PDOLig htcurves.htm]
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 | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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