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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 559 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4229445910453244 6.5386e-09  
a 1.768974947335498 4.1587e-09 au
q 1.020796561665261 1.24e-08 au
i 22.14249624858464 1.8572e-06 deg
node 336.0638555801969 1.2425e-06 deg
peri 27.84781486656305 4.7255e-06 deg
M 50.43779606820457 1.4199e-06 deg
tp 2458880.097764359179
(2020-Jan-31.59776436)
3.2247e-06 TDB
period 859.3715072736836
2.35
3.0305e-06
8.297e-09
d
yr
n .4189107934728757 1.4772e-09 deg/d
Q 2.517153333005735 5.9176e-09 au
  Orbit Determination Parameters
   # obs. used (total)      4618  
   # delay obs. used      6  
   # Doppler obs. used      0  
   data-arc span      14805 days (40.53 yr)  
   first obs. used      1979-03-09  
   last obs. used      2019-09-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .28997  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-21 05:56:08  

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 0.388075555973289 0.388074004354882 0.388077107592027 20.291255859495 20.2909174903434 2423640.429303400 0.126900300279289 79.5030241903753 3.2469012801072 -13.3075883361099 3734212.66941602 T 559 CATAB v2.0f-lin.ifort 2019-Sep-21 05:56:26 2019-Sep-21 05:56
1930-Aug-29 19:23 < 00:01 Earth 0.0523926519493923 0.052391964681841 0.0523933392522082 13.9543947924839 13.9507498750711 2426218.307815907 0.120269271131547 75.9859721018695 0.965778981405402 -63.2003366746513 6674287.66193066 T 559 CATAB v2.0f-lin.ifort 2019-Sep-21 05:56:26 2019-Sep-21 05:56
1937-Sep-23 01:30 < 00:01 Earth 0.299782940664233 0.299781408849428 0.299784472482582 14.1610218035388 14.1603941492878 2428799.562302939 0.203925626423202 92.1638332559128 6.09041606123496 34.1109370938982 3512487.66597679 T 559 CATAB v2.0f-lin.ifort 2019-Sep-21 05:56:26 2019-Sep-21 05:56
1970-Aug-18 03:36 < 00:01 Earth 0.223788168020972 0.223785760176646 0.223790575868771 16.8730325633268 16.8723269103589 2440816.649660945 0.206659840719457 127.885911662331 2.62684638518951 -20.1433573482168 3935115.27730245 T 559 CATAB v2.0f-lin.ifort 2019-Sep-21 05:56:26 2019-Sep-21 05:56
1977-Sep-07 14:11 < 00:01 Earth 0.113706539241193 0.113704279977681 0.113708798619774 13.0821016494009 13.0803103048333 2443394.091219444 0.254512413311244 212.709310998309 2.20008874827799 58.0223543872334 6421036.2095294 T 559 CATAB v2.0f-lin.ifort 2019-Sep-21 05:56:26 2019-Sep-21 05:56
1984-Oct-08 08:01 < 00:01 Earth 0.451047460617686 0.45104548194036 0.451049439297012 16.7695645644207 16.7692122966669 2445981.833962664 0.324960842148031 109.591983403576 9.63759980326468 25.9095078928893 2583109.73251848 T 559 CATAB v2.0f-lin.ifort 2019-Sep-21 05:56:26 2019-Sep-21 05:56
2010-Aug-11 12:57 < 00:01 Earth 0.338836332517717 0.338835873370229 0.338836791665243 19.2694050287553 19.2689969361947 2455420.039770310 0.0386221626788117 23.6300923434645 2.977786655076 -14.441614650551 4239795.8685952 T 559 CATAB v2.0f-lin.ifort 2019-Sep-21 05:56:26 2019-Sep-21 05:56
2017-Sep-01 12:06 < 00:01 Earth 0.0472367777987831 0.0472367715407348 0.0472367840568315 13.534620803777 13.5304525622247 2457998.004056515 0.00252329444464842 2.9248534401292 0.309275743806849 -89.1613744988644 24778975.3699312 T 559 CATAB v2.0f-lin.ifort 2019-Sep-21 05:56:26 2019-Sep-21 05:56
2024-Oct-01 03:49 < 00:01 Earth 0.381687665360935 0.38168720329297 0.381688127429031 15.3070769665705 15.3066209102962 2460584.659303305 0.0668933465606852 25.720716132387 8.25927815517974 27.9887793923993 3125151.04012301 T 559 CATAB v2.0f-lin.ifort 2019-Sep-21 05:56:26 2019-Sep-21 05:56
2050-Aug-11 02:01 < 00:01 Earth 0.348111794096372 0.348109728682993 0.348113859510504 19.5125474830939 19.5121552140728 2470029.583966109 0.166496633327961 106.133135578138 2.96125119073855 -13.9795291333505 3811056.32111825 T 559 CATAB v2.0f-lin.ifort 2019-Sep-21 05:56:26 2019-Sep-21 05:56
2057-Sep-02 00:41 < 00:01 Earth 0.0499579029761839 0.0499567075265445 0.0499590986055359 13.4723628846967 13.4684034953856 2472608.528472601 0.241327538975675 160.908437419513 0.971224014407424 68.2552707532537 8111576.85906281 T 559 CATAB v2.0f-lin.ifort 2019-Sep-21 05:56:26 2019-Sep-21 05:56
2064-Oct-05 16:51 < 00:01 Earth 0.416620882946087 0.416616409646177 0.416625356256914 15.954623278743 15.9542224210493 2475199.201838390 0.71021584112771 247.155609864522 9.3473709723804 25.5300203664424 2385748.97431416 T 559 CATAB v2.0f-lin.ifort 2019-Sep-21 05:56:26 2019-Sep-21 05:56
2090-Aug-17 14:27 < 00:01 Earth 0.234026493712857 0.23401471518126 0.234038272314933 17.167920510858 17.1672573207718 2484646.102407622 0.999204141313512 621.286810757779 2.53381558539483 -19.0287395461415 4028637.82392479 T 559 CATAB v2.0f-lin.ifort 2019-Sep-21 05:56:26 2019-Sep-21 05:56
2097-Sep-11 03:08 00:01 Earth 0.155834470083911 0.155821907710334 0.155847035028029 12.991147670314 12.9898314660005 2487227.630477548 1.46708267132038 1178.43409898069 2.7285758956265 57.8842261223805 6356957.17755388 T 559 CATAB v2.0f-lin.ifort 2019-Sep-21 05:56:26 2019-Sep-21 05:56
2123-Aug-05 05:20 < 00:01 Earth 0.472392135270712 0.472380332700519 0.472403937850275 22.4970498259999 22.4967991074034 2496685.722364567 0.928022181275062 597.813310709255 3.13738634386154 -10.1050560621095 3554024.29617185 T 559 CATAB v2.0f-lin.ifort 2019-Sep-21 05:56:26 2019-Sep-21 05:56
2130-Aug-27 19:26 00:01 Earth 0.0869785675565018 0.0869684441029787 0.0869886917320254 14.6043435586067 14.6022458302142 2499265.309375024 1.05440008532827 641.121008759595 1.48245013327855 -38.0567555186056 4921894.73552724 T 559 CATAB v2.0f-lin.ifort 2019-Sep-21 05:56:26 2019-Sep-21 05:56
2137-Sep-24 01:04 00:01 Earth 0.289171711105584 0.289163737914441 0.289179684429065 13.8191844390399 13.8185176558901 2501849.544553042 1.12560257341538 503.254858646738 6.12626726737481 37.8153214741055 3628478.53767713 T 559 CATAB v2.0f-lin.ifort 2019-Sep-21 05:56:26 2019-Sep-21 05:56
2163-Aug-07 05:08 < 00:01 Earth 0.437994094841869 0.437988710283702 0.437999479402377 21.7008551390726 21.7005748087617 2511297.713612658 0.424267320145036 273.230188475935 2.99848810685537 -10.6741358932737 3637893.07135447 T 559 CATAB v2.0f-lin.ifort 2019-Sep-21 05:56:26 2019-Sep-21 05:56
2170-Aug-28 08:54 < 00:01 Earth 0.0781270494640209 0.0781192891619409 0.0781348103182515 14.4959419534156 14.4935890736243 2513875.871156534 0.84635238660834 506.99753188599 1.34014215741915 -40.2465177940796 5133309.94137249 T 559 CATAB v2.0f-lin.ifort 2019-Sep-21 05:56:26 2019-Sep-21 05:56
2177-Sep-22 14:01 00:01 Earth 0.272042750924151 0.272032507079149 0.272052995050209 13.5973367768149 13.5966164445824 2516458.084063557 1.42320923971103 671.640273597939 5.70610527712762 40.4891952617619 3886880.87555861 T 559 CATAB v2.0f-lin.ifort 2019-Sep-21 05:56:26 2019-Sep-21 05:56

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