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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 577 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4229445972890654 6.4427e-09  
a 1.768974947132197 4.1106e-09 au
q 1.020796550502924 1.2178e-08 au
i 22.1424969803375 1.8568e-06 deg
node 336.0638557779579 1.2413e-06 deg
peri 27.84781936526354 4.6146e-06 deg
M 50.43779449975912 1.4153e-06 deg
tp 2458880.097768124039
(2020-Jan-31.59776812)
3.2071e-06 TDB
period 859.3715071255373
2.35
2.9954e-06
8.201e-09
d
yr
n .4189107935450914 1.4602e-09 deg/d
Q 2.517153343761469 5.8492e-09 au
  Orbit Determination Parameters
   # obs. used (total)      4695  
   # delay obs. used      6  
   # Doppler obs. used      0  
   data-arc span      15291 days (41.86 yr)  
   first obs. used      1979-03-09  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .29427  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jan-19 05:27:52  

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. 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 0.38807554980075 0.388074005655125 0.388077093946728 20.2912564769164 20.2909181077698 2423640.429304594 0.126219685457176 79.1173988062049 3.24592759405065 -13.2993191202909 3733541.04311651 T 577 CATAB v2.0f-lin.ifort 2021-Jan-19 05:28:03 2021-Jan-19 05:28
1930-Aug-29 19:23 < 00:01 Earth 0.052392649405393 0.0523919664380326 0.0523933324075981 13.954395314717 13.9507503972635 2426218.307816804 0.119487058426814 75.5250944292394 0.964627497994777 -63.2060163826588 6680618.26565002 T 577 CATAB v2.0f-lin.ifort 2021-Jan-19 05:28:03 2021-Jan-19 05:28
1937-Sep-23 01:30 < 00:01 Earth 0.29978294843977 0.299781428530487 0.299784468352546 14.1610218690607 14.1603942148289 2428799.562303327 0.202249097112426 91.4452819789391 6.0901106984761 34.1101902699662 3512582.31147682 T 577 CATAB v2.0f-lin.ifort 2021-Jan-19 05:28:03 2021-Jan-19 05:28
1970-Aug-18 03:36 < 00:01 Earth 0.223788148579904 0.223785766217879 0.223790530945337 16.873032912813 16.8723272597983 2440816.649662855 0.204430392824346 126.533756469247 2.62654044834493 -20.145017663647 3935748.93559396 T 577 CATAB v2.0f-lin.ifort 2021-Jan-19 05:28:03 2021-Jan-19 05:28
1977-Sep-07 14:11 < 00:01 Earth 0.113706559395325 0.113704324535896 0.113708794367476 13.0821019788344 13.0803106346295 2443394.091220836 0.251746334337209 210.498832027714 2.16917885494666 58.037143465401 6506487.13099161 T 577 CATAB v2.0f-lin.ifort 2021-Jan-19 05:28:03 2021-Jan-19 05:28
1984-Oct-08 08:01 < 00:01 Earth 0.451047478139468 0.451045520965434 0.451049435315476 16.7695646836203 16.7692124158827 2445981.833965408 0.321147859527362 108.357381903157 9.62049325149383 25.8636302245481 2584507.23457034 T 577 CATAB v2.0f-lin.ifort 2021-Jan-19 05:28:03 2021-Jan-19 05:28
2010-Aug-11 12:57 < 00:01 Earth 0.338836328621414 0.338835874475779 0.338836782767088 19.2694056735043 19.2689975809527 2455420.039771815 0.0381544406818421 23.3706822818338 2.97722386055653 -14.4249589542956 4245137.06689472 T 577 CATAB v2.0f-lin.ifort 2021-Jan-19 05:28:03 2021-Jan-19 05:28
2017-Sep-01 12:06 < 00:01 Earth 0.0472367774477896 0.0472367711898085 0.0472367837057708 13.5346213341316 13.5304530927117 2457998.004056863 0.00252263557243324 2.90543131833862 0.309242199331433 -89.1513657079479 24786348.8094542 T 577 CATAB v2.0f-lin.ifort 2021-Jan-19 05:28:03 2021-Jan-19 05:28
2024-Oct-01 03:49 < 00:01 Earth 0.381687656372908 0.381687199723876 0.381688113022048 15.3070766342125 15.3066205779175 2460584.659302761 0.0663356281136081 25.4569924725619 8.23754973718574 28.1998067209485 3154847.8045928 T 577 CATAB v2.0f-lin.ifort 2021-Jan-19 05:28:03 2021-Jan-19 05:28
2050-Aug-11 02:01 < 00:01 Earth 0.348111832136327 0.348109790064964 0.348113874208422 19.5125490704059 19.5121568014595 2470029.583964920 0.164659858385973 104.93491025936 2.96085041229972 -13.9823423189809 3813195.03500293 T 577 CATAB v2.0f-lin.ifort 2021-Jan-19 05:28:03 2021-Jan-19 05:28
2057-Sep-02 00:41 < 00:01 Earth 0.0499578810074727 0.049956698904009 0.0499590632865822 13.4723637646182 13.4684043738244 2472608.528469943 0.238638070465469 159.082567622084 0.96828922771865 68.2511013733315 8144153.38757793 T 577 CATAB v2.0f-lin.ifort 2021-Jan-19 05:28:03 2021-Jan-19 05:28
2064-Oct-05 16:51 < 00:01 Earth 0.416620799277815 0.416616375646479 0.416625222919857 15.9546213352711 15.954220477448 2475199.201829038 0.702602242860442 244.454535393933 9.32706473431812 25.551587778838 2393147.22868602 T 577 CATAB v2.0f-lin.ifort 2021-Jan-19 05:28:03 2021-Jan-19 05:28
2090-Aug-17 14:27 < 00:01 Earth 0.234026715902508 0.234015062602153 0.234038369271851 17.1679255976591 17.1672624083991 2484646.102395919 0.988608168364794 614.679641345896 2.53343187296924 -19.0283295799264 4029015.15209549 T 577 CATAB v2.0f-lin.ifort 2021-Jan-19 05:28:03 2021-Jan-19 05:28
2097-Sep-11 03:08 00:01 Earth 0.15583423359575 0.155821802351398 0.155846667356747 12.9911477202358 12.9898315139299 2487227.630458030 1.45178107194923 1166.04688109892 2.70737517229217 57.8816009159833 6393101.62063472 T 577 CATAB v2.0f-lin.ifort 2021-Jan-19 05:28:03 2021-Jan-19 05:28
2123-Aug-05 05:20 < 00:01 Earth 0.472392359854942 0.472380663878321 0.472404055840748 22.4970559337257 22.4968052153164 2496685.722353254 0.919702345196497 592.417285962587 3.13567999780881 -10.1067191264802 3556818.2374539 T 577 CATAB v2.0f-lin.ifort 2021-Jan-19 05:28:03 2021-Jan-19 05:28
2130-Aug-27 19:25 00:01 Earth 0.0869787598793261 0.0869687212800061 0.086988799188535 14.6043472618902 14.6022495386684 2499265.309361903 1.0455754499103 635.737332474122 1.48024092354361 -38.0556466191441 4927298.7296158 T 577 CATAB v2.0f-lin.ifort 2021-Jan-19 05:28:03 2021-Jan-19 05:28
2137-Sep-24 01:04 00:01 Earth 0.289171561098876 0.289163646197355 0.289179476130814 13.8191826737816 13.8185158902007 2501849.544538309 1.11746641025138 499.583792153934 6.12545702351619 37.8165673789878 3629303.57742873 T 577 CATAB v2.0f-lin.ifort 2021-Jan-19 05:28:03 2021-Jan-19 05:28
2163-Aug-07 05:08 < 00:01 Earth 0.437993984669925 0.437988686413322 0.437999282928819 21.7008532768784 21.7005729464729 2511297.713620027 0.417413085562488 268.847679947926 2.99707289903593 -10.6704447049118 3638732.07015659 T 577 CATAB v2.0f-lin.ifort 2021-Jan-19 05:28:03 2021-Jan-19 05:28
2170-Aug-28 08:54 < 00:01 Earth 0.0781268930003286 0.0781192398765651 0.0781345466611333 14.4959400524229 14.4935871676107 2513875.871169790 0.834652420651948 500.002575473149 1.33832745545639 -40.2475352377975 5138581.07311882 T 577 CATAB v2.0f-lin.ifort 2021-Jan-19 05:28:03 2021-Jan-19 05:28
2177-Sep-22 14:01 00:01 Earth 0.272042958899723 0.272032844090088 0.272053073983391 13.5973389495772 13.5966186180105 2516458.084082316 1.40523045573086 663.186082447714 5.70568906501595 40.4898640169602 3887182.78471277 T 577 CATAB v2.0f-lin.ifort 2021-Jan-19 05:28:03 2021-Jan-19 05:28

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