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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 565 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4229445969152412 6.5219e-09  
a 1.768974947346574 4.1505e-09 au
q 1.020796551287917 1.2362e-08 au
i 22.14249700187301 1.8571e-06 deg
node 336.0638557991811 1.2422e-06 deg
peri 27.8478190209106 4.7067e-06 deg
M 50.43779453386058 1.4191e-06 deg
tp 2458880.097768020747
(2020-Jan-31.59776802)
3.2216e-06 TDB
period 859.3715072817548
2.35
3.0245e-06
8.281e-09
d
yr
n .4189107934689413 1.4743e-09 deg/d
Q 2.517153343405231 5.9059e-09 au
  Orbit Determination Parameters
   # obs. used (total)      4648  
   # delay obs. used      6  
   # Doppler obs. used      0  
   data-arc span      15239 days (41.72 yr)  
   first obs. used      1979-03-09  
   last obs. used      2020-11-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .29049  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-28 05:19:44  

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

[ 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 0.388075569629701 0.38807401109222 0.388077128167535 20.2912568824277 20.2909185133051 2423640.429303742 0.127445303826568 79.8569972561807 3.24664314930539 -13.3058085189701 3733490.18990247 T 565 CATAB v2.0f-lin.ifort 2020-Nov-28 05:19:54 2020-Nov-28 05:19
1930-Aug-29 19:23 < 00:01 Earth 0.0523926583714265 0.0523919690832909 0.0523933476950411 13.9543954863136 13.9507505695289 2426218.307815824 0.120615792615162 76.2136607106025 0.965530370723271 -63.201904788927 6675787.17153837 T 565 CATAB v2.0f-lin.ifort 2020-Nov-28 05:19:54 2020-Nov-28 05:19
1937-Sep-23 01:30 < 00:01 Earth 0.299782927433104 0.299781393405037 0.299784461464732 14.1610216609051 14.1603940066201 2428799.562302609 0.204194722754268 92.2948831357835 6.09020930528017 34.1087397714925 3512296.22701096 T 565 CATAB v2.0f-lin.ifort 2020-Nov-28 05:19:54 2020-Nov-28 05:19
1970-Aug-18 03:36 < 00:01 Earth 0.223788187648803 0.223785783015781 0.223790592285285 16.8730336284771 16.8723279756156 2440816.649660704 0.20637724891064 127.715655898297 2.62666571704241 -20.1437408168081 3935417.18176284 T 565 CATAB v2.0f-lin.ifort 2020-Nov-28 05:19:54 2020-Nov-28 05:19
1977-Sep-07 14:11 < 00:01 Earth 0.113706521579082 0.113704265772647 0.113708777500262 13.0821020750057 13.0803107302181 2443394.091218171 0.254120271796508 212.399188501346 2.19505387254216 58.0249353655622 6434804.16988747 T 565 CATAB v2.0f-lin.ifort 2020-Nov-28 05:19:54 2020-Nov-28 05:19
1984-Oct-08 08:01 < 00:01 Earth 0.451047444170829 0.451045468768583 0.451049419575074 16.7695639669333 16.7692116991541 2445981.833961088 0.3243721909976 109.402646389101 9.63415234188459 25.9011593287527 2583419.15869033 T 565 CATAB v2.0f-lin.ifort 2020-Nov-28 05:19:54 2020-Nov-28 05:19
2010-Aug-11 12:57 < 00:01 Earth 0.338836336610034 0.338835878327362 0.338836794892744 19.2694058677703 19.2689977752324 2455420.039770186 0.0385424971293078 23.5853142303207 2.97758521300284 -14.4394624097184 4240976.97926386 T 565 CATAB v2.0f-lin.ifort 2020-Nov-28 05:19:54 2020-Nov-28 05:19
2017-Sep-01 12:06 < 00:01 Earth 0.0472367774365961 0.0472367711785962 0.0472367836945988 13.5346213363636 13.5304530949434 2457998.004056642 0.00252311650462712 2.92173527738685 0.309268068013418 -89.1597084983697 24780080.3937889 T 565 CATAB v2.0f-lin.ifort 2020-Nov-28 05:19:54 2020-Nov-28 05:19
2024-Oct-01 03:49 < 00:01 Earth 0.381687664738998 0.381687203587773 0.381688125890353 15.307076820684 15.3066207644046 2460584.659303416 0.0667991022154613 25.6762389981412 8.25505597051133 28.0246100754053 3130306.97773913 T 565 CATAB v2.0f-lin.ifort 2020-Nov-28 05:19:54 2020-Nov-28 05:19
2050-Aug-11 02:01 < 00:01 Earth 0.348111797057005 0.348109735073181 0.34811385904158 19.5125482358968 19.5121559668941 2470029.583967581 0.166227142535904 105.957072841459 2.96106850289996 -13.9799121346587 3811520.20366256 T 565 CATAB v2.0f-lin.ifort 2020-Nov-28 05:19:54 2020-Nov-28 05:19
2057-Sep-02 00:41 < 00:01 Earth 0.0499579009793184 0.0499567073349877 0.049959094802805 13.4723634292152 13.4684040399058 2472608.528472773 0.240963454559087 160.660108755901 0.970738279892285 68.2545202645241 8116899.39503925 T 565 CATAB v2.0f-lin.ifort 2020-Nov-28 05:19:54 2020-Nov-28 05:19
2064-Oct-05 16:51 < 00:01 Earth 0.416620874582514 0.416616407560336 0.416625341615586 15.954622943104 15.9542220853937 2475199.201838541 0.709267744812298 246.816563216247 9.34326573637172 25.5338573465683 2387177.47897848 T 565 CATAB v2.0f-lin.ifort 2020-Nov-28 05:19:54 2020-Nov-28 05:19
2090-Aug-17 14:27 < 00:01 Earth 0.234026519195888 0.234014751731579 0.234038286730542 17.1679217049582 17.1672585149904 2484646.102407119 0.998271566837944 620.702861927144 2.5336221599584 -19.0286926007827 4028900.05842153 T 565 CATAB v2.0f-lin.ifort 2020-Nov-28 05:19:54 2020-Nov-28 05:19
2097-Sep-11 03:08 00:01 Earth 0.155834443364059 0.155821890333374 0.155846998961362 12.9911479496374 12.9898317451265 2487227.630474844 1.46599375807867 1177.54023946667 2.72500006750591 57.8836962385314 6363045.34320858 T 565 CATAB v2.0f-lin.ifort 2020-Nov-28 05:19:54 2020-Nov-28 05:19
2123-Aug-05 05:20 < 00:01 Earth 0.472392161712764 0.472380351049595 0.472403972385304 22.4970511664614 22.4968004478938 2496685.722364330 0.928676067997204 598.224086310458 3.13700497228584 -10.105516454798 3554655.23420818 T 565 CATAB v2.0f-lin.ifort 2020-Nov-28 05:19:54 2020-Nov-28 05:19
2130-Aug-27 19:25 00:01 Earth 0.0869785898221714 0.0869684528226418 0.0869887275456249 14.6043445232871 14.6022467955703 2499265.309374401 1.05581817237505 641.977433827631 1.48197425879602 -38.0565866366365 4923136.51087955 T 565 CATAB v2.0f-lin.ifort 2020-Nov-28 05:19:54 2020-Nov-28 05:19
2137-Sep-24 01:04 00:01 Earth 0.289171694810746 0.289163702326659 0.289179687427813 13.8191842856834 13.8185175024886 2501849.544551857 1.12835079959471 504.47461288801 6.12582891843682 37.8155984103044 3628811.24874104 T 565 CATAB v2.0f-lin.ifort 2020-Nov-28 05:19:54 2020-Nov-28 05:19
2163-Aug-07 05:08 < 00:01 Earth 0.437994074605747 0.437988724153792 0.437999425060018 21.7008553615435 21.7005750312225 2511297.713615037 0.421565736975014 271.498329484204 2.99816661637618 -10.6728033753225 3637947.31220158 T 565 CATAB v2.0f-lin.ifort 2020-Nov-28 05:19:54 2020-Nov-28 05:19
2170-Aug-28 08:54 < 00:01 Earth 0.0781270225907366 0.0781192941677334 0.0781347515613649 14.4959421203949 14.4935892398214 2513875.871159489 0.842871170004204 504.914703586205 1.33976093140696 -40.2465158195071 5134468.30809284 T 565 CATAB v2.0f-lin.ifort 2020-Nov-28 05:19:54 2020-Nov-28 05:19
2177-Sep-22 14:01 00:01 Earth 0.272042787920304 0.272032573575393 0.272053002544661 13.5973372145245 13.5966168824132 2516458.084066508 1.41911056462001 669.71097897368 5.70577423258103 40.4896977031793 3887140.63562316 T 565 CATAB v2.0f-lin.ifort 2020-Nov-28 05:19:54 2020-Nov-28 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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