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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 280 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4227883801182804 6.7269e-08  
a 1.768293076194758 5.0772e-09 AU
q 1.020679310936005 1.1915e-07 AU
i 22.16262852378333 7.0467e-06 deg
node 336.121818783861 1.1839e-05 deg
peri 27.70418515637208 1.3905e-05 deg
M 292.5171339093014 1.0655e-05 deg
tp 2457161.498123862402
(2015-May-18.99812386)
2.5769e-05 JED
period 858.8746736477649
2.35
3.6991e-06
1.013e-08
d
yr
n .4191531209914806 1.8052e-09 deg/d
Q 2.51590684145351 7.2238e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      1590  
   data-arc span      12812 days (35.08 yr)  
   first obs. used      1979-03-09  
   last obs. used      2014-04-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49276  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Aug-13 14:00:19  

Additional Information
 Earth MOID = .0453336 AU 
 T_jup = 3.921 
[ 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 Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) 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.]
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 (413)
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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