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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 591 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4230219934342966 6.2589e-09  
a 1.769011262229405 4.0291e-09 au
q 1.020680591673401 1.1756e-08 au
i 22.14392694207305 1.8561e-06 deg
node 336.0623818995829 1.2392e-06 deg
peri 27.8509329415557 4.3885e-06 deg
M 134.2059880252439 1.5679e-06 deg
tp 2458880.121239736482
(2020-Jan-31.62123974)
3.1725e-06 TDB
period 859.3979701797791
2.35
2.9361e-06
8.039e-09
d
yr
n .418897894213889 1.4311e-09 deg/d
Q 2.517341932785409 5.7335e-09 au
  Orbit Determination Parameters
   # obs. used (total)      4776  
   # delay obs. used      6  
   # Doppler obs. used      0  
   data-arc span      15329 days (41.97 yr)  
   first obs. used      1979-03-09  
   last obs. used      2021-02-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .29556  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-26 05:18:58  

Additional Information
 Earth MOID = .0434857 au 
 Jupiter MOID = 2.99892 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. 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

[ hide close-approach data ]
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 0.388075576614985 0.388074067514123 0.388077085716177 20.2912570737263 20.290918704613 2423640.429301939 0.123229801362218 77.3161523985572 3.24388545826781 -13.2820700329034 3733776.17731651 T 591 CATAB v2.0f-lin.ifort 2021-Feb-26 05:19:07 2021-Feb-26 05:19
1930-Aug-29 19:23 < 00:01 Earth 0.0523926619150245 0.0523919943206206 0.0523933295427451 13.9543955463591 13.9507506298366 2426218.307815033 0.116736437065552 73.8491042774841 0.962685010705496 -63.2158344930687 6690803.66445607 T 591 CATAB v2.0f-lin.ifort 2021-Feb-26 05:19:07 2021-Feb-26 05:19
1937-Sep-23 01:30 < 00:01 Earth 0.299782918843408 0.299781433295949 0.299784404394207 14.1610215563553 14.1603939020477 2428799.562301806 0.197515201990203 89.3789275073116 6.08952333169805 34.1151986253862 3513616.85355926 T 591 CATAB v2.0f-lin.ifort 2021-Feb-26 05:19:07 2021-Feb-26 05:19
1970-Aug-18 03:36 < 00:01 Earth 0.223788203261142 0.223785875065698 0.223790531459841 16.8730339256917 16.8723282728919 2440816.649659114 0.19969017818591 123.65880716305 2.62626666047312 -20.1477456595381 3936537.91260483 T 591 CATAB v2.0f-lin.ifort 2021-Feb-26 05:19:07 2021-Feb-26 05:19
1977-Sep-07 14:11 < 00:01 Earth 0.113706507373203 0.113704323466602 0.113708691387712 13.0821020996683 13.0803107546603 2443394.091216747 0.245970102802427 205.87764421627 2.1029508213544 58.0679931867761 6697123.58905139 T 591 CATAB v2.0f-lin.ifort 2021-Feb-26 05:19:07 2021-Feb-26 05:19
1984-Oct-08 08:01 < 00:01 Earth 0.451047431768942 0.451045518932614 0.451049344607117 16.7695637076229 16.7692114398285 2445981.833959732 0.313309676863242 105.816355692147 9.58747333428223 25.7706777185365 2587059.546802 T 591 CATAB v2.0f-lin.ifort 2021-Feb-26 05:19:07 2021-Feb-26 05:19
2010-Aug-11 12:57 < 00:01 Earth 0.338836340191164 0.338835896079966 0.338836784302399 19.2694058814084 19.2689977888751 2455420.039770927 0.0372074701703026 22.8497527569231 2.97614520068348 -14.3852863089171 4255362.66889237 T 591 CATAB v2.0f-lin.ifort 2021-Feb-26 05:19:07 2021-Feb-26 05:19
2017-Sep-01 12:06 < 00:01 Earth 0.0472367774916946 0.0472367712339255 0.0472367837494663 13.5346213169055 13.5304530754842 2457998.004056968 0.00252132219441207 2.86507521779895 0.309177292514074 -89.1314194021053 24802500.2419573 T 591 CATAB v2.0f-lin.ifort 2021-Feb-26 05:19:07 2021-Feb-26 05:19
2024-Oct-01 03:49 < 00:01 Earth 0.38168766906795 0.381687223430406 0.381688114705602 15.3070769119827 15.3066208557112 2460584.659303973 0.0651996335140268 24.9208609264963 8.19430365264778 28.6406199596207 3216594.67165358 T 591 CATAB v2.0f-lin.ifort 2021-Feb-26 05:19:07 2021-Feb-26 05:19
2050-Aug-11 02:01 < 00:01 Earth 0.348111779451894 0.348109786029758 0.348113772874742 19.512547841577 19.5121555725466 2470029.583968099 0.160835484636805 102.43785460302 2.96016737478047 -13.9890384550905 3817807.59532956 T 591 CATAB v2.0f-lin.ifort 2021-Feb-26 05:19:07 2021-Feb-26 05:19
2057-Sep-02 00:41 < 00:01 Earth 0.0499579110939169 0.0499567571676306 0.0499590651874207 13.4723632529771 13.4684038644176 2472608.528473793 0.232960485752892 155.229092914424 0.961787225957232 68.2421806701754 8216636.36856665 T 591 CATAB v2.0f-lin.ifort 2021-Feb-26 05:19:07 2021-Feb-26 05:19
2064-Oct-05 16:51 < 00:01 Earth 0.416620911104904 0.416616593485697 0.416625228734341 15.95462369609 15.9542228384338 2475199.201842430 0.686313664290156 238.682661910483 9.28770176370492 25.5958515370784 2407888.3460788 T 591 CATAB v2.0f-lin.ifort 2021-Feb-26 05:19:07 2021-Feb-26 05:19
2090-Aug-17 14:27 < 00:01 Earth 0.234026423348722 0.234015049040779 0.234037797722381 17.1679197927337 17.1672566024204 2484646.102412690 0.964997604951627 599.96065334898 2.53303307102205 -19.0275448539449 4029294.39721117 T 591 CATAB v2.0f-lin.ifort 2021-Feb-26 05:19:07 2021-Feb-26 05:19
2097-Sep-11 03:08 00:01 Earth 0.155834545085773 0.155822411458345 0.155846681109761 12.9911480468142 12.9898318431724 2487227.630482961 1.41705088674901 1137.95581957134 2.6622580739685 57.8761717396248 6471475.2492691 T 591 CATAB v2.0f-lin.ifort 2021-Feb-26 05:19:07 2021-Feb-26 05:19
2123-Aug-05 05:20 < 00:01 Earth 0.472392069837687 0.472380654136367 0.472403485547788 22.4970489747011 22.4967982560604 2496685.722368745 0.897776988692186 578.226629194293 3.1320682922975 -10.1098803356185 3562653.15402196 T 591 CATAB v2.0f-lin.ifort 2021-Feb-26 05:19:07 2021-Feb-26 05:19
2130-Aug-27 19:26 00:01 Earth 0.0869785118592262 0.0869687137620834 0.0869883106325466 14.6043432689593 14.6022455391818 2499265.309379609 1.02054804969819 620.488203321864 1.47627817864555 -38.0535555869831 4936750.44242783 T 591 CATAB v2.0f-lin.ifort 2021-Feb-26 05:19:07 2021-Feb-26 05:19
2137-Sep-24 01:04 00:01 Earth 0.289171755585436 0.28916403027879 0.28917948101635 13.8191850025295 13.8185182195095 2501849.544557717 1.09086720660416 487.62999129678 6.12438386531985 37.8187615169056 3630623.19462023 T 591 CATAB v2.0f-lin.ifort 2021-Feb-26 05:19:07 2021-Feb-26 05:19
2163-Aug-07 05:08 < 00:01 Earth 0.437994119166945 0.437988948457493 0.437999289878563 21.7008563656165 21.700576035337 2511297.713613082 0.407260736833027 262.370222249135 2.99407815578948 -10.6642492945973 3640955.7813722 T 591 CATAB v2.0f-lin.ifort 2021-Feb-26 05:19:07 2021-Feb-26 05:19
2170-Aug-28 08:54 < 00:01 Earth 0.0781270855189388 0.0781196163811105 0.0781345551683805 14.4959430958326 14.4935902173128 2513875.871155159 0.814564202764051 487.998240533142 1.335112068067 -40.249825427692 5147752.07936197 T 591 CATAB v2.0f-lin.ifort 2021-Feb-26 05:19:07 2021-Feb-26 05:19
2177-Sep-22 14:01 00:01 Earth 0.27204270546852 0.272032833914596 0.272052577283458 13.5973363518661 13.5966160194908 2516458.084057968 1.37130758860159 647.241933070832 5.70512514117362 40.4905070608927 3887537.91491241 T 591 CATAB v2.0f-lin.ifort 2021-Feb-26 05:19:07 2021-Feb-26 05:19

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