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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 566 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4229445968320528 6.5197e-09  
a 1.76897494739889 4.1494e-09 au
q 1.020796551465264 1.2357e-08 au
i 22.14249700106365 1.8571e-06 deg
node 336.0638557998342 1.2422e-06 deg
peri 27.84781893493626 4.7042e-06 deg
M 50.43779454724203 1.419e-06 deg
tp 2458880.097767983462
(2020-Jan-31.59776798)
3.2212e-06 TDB
period 859.3715073198773
2.35
3.0237e-06
8.278e-09
d
yr
n .418910793450358 1.4739e-09 deg/d
Q 2.517153343332515 5.9044e-09 au
  Orbit Determination Parameters
   # obs. used (total)      4652  
   # delay obs. used      6  
   # Doppler obs. used      0  
   data-arc span      15243 days (41.73 yr)  
   first obs. used      1979-03-09  
   last obs. used      2020-12-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .291  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-02 05:29:33  

Additional Information
 Earth MOID = .0453329 au 
 Jupiter MOID = 2.99821 au 
 T_jup = 3.920 
[ show covariance matrix ]

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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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1923-Aug-08 22:18 < 00:01 Earth 0.38807557533558 0.388074017181912 0.388077133489602 20.2912570346431 20.290918665528 2423640.429302576 0.127412699892549 79.8372792764412 3.24661746471435 -13.3056549948695 3733503.15153467 T 566 CATAB v2.0f-lin.ifort 2020-Dec-02 05:29:43 2020-Dec-02 05:29
1930-Aug-29 19:23 < 00:01 Earth 0.0523926610162454 0.052391971896756 0.0523933501711959 13.9543955408922 13.9507506243057 2426218.307815059 0.12058573624863 76.195303395718 0.965500420482411 -63.2020188405408 6675956.95089309 T 566 CATAB v2.0f-lin.ifort 2020-Dec-02 05:29:43 2020-Dec-02 05:29
1937-Sep-23 01:30 < 00:01 Earth 0.299782921370363 0.299781387719046 0.299784455025243 14.1610215698451 14.1603939155434 2428799.562301027 0.204142719155932 92.2721784945516 6.09018857484331 34.1087464298261 3512311.79042045 T 566 CATAB v2.0f-lin.ifort 2020-Dec-02 05:29:43 2020-Dec-02 05:29
1970-Aug-18 03:36 < 00:01 Earth 0.223788196670132 0.223785792632541 0.223790600711195 16.8730338011523 16.8723281483265 2440816.649659868 0.206325278044391 127.68406590277 2.62665229074928 -20.1437848460655 3935441.76825511 T 566 CATAB v2.0f-lin.ifort 2020-Dec-02 05:29:43 2020-Dec-02 05:29
1977-Sep-07 14:11 < 00:01 Earth 0.113706513173046 0.113704257926619 0.113708768534162 13.0821020943483 13.080310749431 2443394.091217224 0.254056824856903 212.348385004349 2.19436597397574 58.025259228649 6436686.70484169 T 566 CATAB v2.0f-lin.ifort 2020-Dec-02 05:29:43 2020-Dec-02 05:29
1984-Oct-08 08:01 < 00:01 Earth 0.45104743696683 0.45104546205181 0.451049411883851 16.769563849711 16.7692115819237 2445981.833961470 0.324285765842492 109.374660424276 9.63372750194108 25.9001139118763 2583459.72957652 T 566 CATAB v2.0f-lin.ifort 2020-Dec-02 05:29:43 2020-Dec-02 05:29
2010-Aug-11 12:57 < 00:01 Earth 0.338836338228517 0.338835880056822 0.33883679640025 19.2694058762827 19.2689977837469 2455420.039770498 0.0385321746289706 23.5795630969788 2.9775684006281 -14.4391411406875 4241108.26585449 T 566 CATAB v2.0f-lin.ifort 2020-Dec-02 05:29:43 2020-Dec-02 05:29
2017-Sep-01 12:06 < 00:01 Earth 0.0472367774547672 0.0472367711967699 0.0472367837127672 13.534621331958 13.5304530905381 2457998.004056674 0.00252309941979829 2.92131036625664 0.309267236718133 -89.1594839024243 24780235.4225159 T 566 CATAB v2.0f-lin.ifort 2020-Dec-02 05:29:43 2020-Dec-02 05:29
2024-Oct-01 03:49 < 00:01 Earth 0.381687666711741 0.381687205680039 0.381688127743551 15.3070768466547 15.3066207903784 2460584.659302927 0.0667869220825535 25.670449926736 8.25453389687831 28.0293518022734 3130977.17161853 T 566 CATAB v2.0f-lin.ifort 2020-Dec-02 05:29:43 2020-Dec-02 05:29
2050-Aug-11 02:01 < 00:01 Earth 0.348111784536612 0.348109723082049 0.348113845991927 19.5125479518608 19.5121556828383 2470029.583968240 0.166185408587077 105.929899537332 2.96105481529114 -13.9799641682337 3811570.42576835 T 566 CATAB v2.0f-lin.ifort 2020-Dec-02 05:29:43 2020-Dec-02 05:29
2057-Sep-02 00:41 < 00:01 Earth 0.0499579084968303 0.0499567151588059 0.0499591020139169 13.4723633015466 13.4684039127956 2472608.528473744 0.240901589245524 160.618163232951 0.970675327220805 68.2544195934885 8117598.26305303 T 566 CATAB v2.0f-lin.ifort 2020-Dec-02 05:29:43 2020-Dec-02 05:29
2064-Oct-05 16:51 < 00:01 Earth 0.416620902760094 0.416616436893563 0.416625368637494 15.9546234850836 15.9542226274141 2475199.201839969 0.709090422882593 246.753691388644 9.34277065999452 25.5343434518789 2387353.61536715 T 566 CATAB v2.0f-lin.ifort 2020-Dec-02 05:29:43 2020-Dec-02 05:29
2090-Aug-17 14:27 < 00:01 Earth 0.234026443128505 0.234014678707992 0.234038207619324 17.1679202004958 17.1672570102543 2484646.102411472 0.998013888866768 620.542285060443 2.53360641271981 -19.0286862207887 4028917.99824671 T 566 CATAB v2.0f-lin.ifort 2020-Dec-02 05:29:43 2020-Dec-02 05:29
2097-Sep-11 03:08 00:01 Earth 0.155834524004831 0.155821974221583 0.155847076353361 12.9911480332802 12.9898318294589 2487227.630481456 1.46561487987714 1177.23346766019 2.72453498102161 57.8836317132576 6363835.88733607 T 566 CATAB v2.0f-lin.ifort 2020-Dec-02 05:29:43 2020-Dec-02 05:29
2123-Aug-05 05:20 < 00:01 Earth 0.472392088492092 0.472380280886851 0.472403896106705 22.4970494167583 22.4967986981323 2496685.722368202 0.928436728775374 598.069255605993 3.13696452359384 -10.1055474916601 3554717.3190255 T 566 CATAB v2.0f-lin.ifort 2020-Dec-02 05:29:43 2020-Dec-02 05:29
2130-Aug-27 19:26 00:01 Earth 0.0869785277805406 0.0869683934071616 0.0869886628774672 14.6043435320805 14.6022458027248 2499265.309378653 1.05554504550826 641.811076444709 1.48191670696964 -38.0565824719929 4923280.83162112 T 566 CATAB v2.0f-lin.ifort 2020-Dec-02 05:29:43 2020-Dec-02 05:29
2137-Sep-24 01:04 00:01 Earth 0.2891717428734 0.289163752458519 0.289179733421195 13.8191848609237 13.8185180778675 2501849.544556810 1.12806066483076 504.344157774081 6.12579801274441 37.8156222503744 3628837.64702784 T 566 CATAB v2.0f-lin.ifort 2020-Dec-02 05:29:43 2020-Dec-02 05:29
2163-Aug-07 05:08 < 00:01 Earth 0.437994112780948 0.437988763719327 0.437999461844885 21.700856219381 21.7005758890956 2511297.713613720 0.421455202641539 271.42772669965 2.99813240799369 -10.6727451496914 3637975.72073325 T 566 CATAB v2.0f-lin.ifort 2020-Dec-02 05:29:43 2020-Dec-02 05:29
2170-Aug-28 08:54 < 00:01 Earth 0.0781270767291512 0.0781193503101764 0.0781348036954628 14.495942985575 14.4935901067725 2513875.871155148 0.842652204149777 504.783806970963 1.3397141497923 -40.2465206881586 5134609.39152905 T 566 CATAB v2.0f-lin.ifort 2020-Dec-02 05:29:43 2020-Dec-02 05:29
2177-Sep-22 14:01 00:01 Earth 0.272042717120056 0.272032505428058 0.272052929091361 13.5973364885868 13.5966161562496 2516458.084059902 1.4187403629049 669.537132327212 5.7057534036042 40.4897081755939 3887154.52374387 T 566 CATAB v2.0f-lin.ifort 2020-Dec-02 05:29:43 2020-Dec-02 05:29

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