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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 634 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4231600895705883 5.8991e-09  
a 1.768841981736369 3.8401e-09 au
q 1.020338650308591 1.0899e-08 au
i 22.14510039846299 1.8495e-06 deg
node 336.0636516312715 1.2347e-06 deg
peri 27.8523582739044 3.935e-06 deg
M 216.3086285864664 1.7568e-06 deg
tp 2459739.473189139402
(2022-Jun-08.97318914)
5.0968e-06 TDB
period 859.2746166702377
2.35
2.7982e-06
7.661e-09
d
yr
n .4189580292677918 1.3643e-09 deg/d
Q 2.517345313164149 5.4651e-09 au
  Orbit Determination Parameters
   # obs. used (total)      5028  
   # delay obs. used      6  
   # Doppler obs. used      0  
   data-arc span      15455 days (42.31 yr)  
   first obs. used      1979-03-09  
   last obs. used      2021-07-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .29969  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-03 06:40:29  

Additional Information
 Earth MOID = .0441469 au 
 Jupiter MOID = 2.99939 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 14.03   n/a MPCxxxxx  
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 0.388075511462669 0.388074065167664 0.388076957757983 20.2912554011269 20.2909170319288 2423640.429305671 0.117830424853089 74.0862282824144 3.23311784657585 -13.2430355245053 3740586.18111522 T 634 CATAB v2.0g-lin.ifort 2021-Jul-03 06:40:59 2021-Jul-03 06:40
1930-Aug-29 19:23 < 00:01 Earth 0.0523926372945604 0.0523919977667592 0.0523932768529863 13.9543949349745 13.9507500165785 2426218.307818035 0.111696519198785 70.7931354002566 0.958668669851388 -63.2365634965959 6714154.08528347 T 634 CATAB v2.0g-lin.ifort 2021-Jul-03 06:40:59 2021-Jul-03 06:40
1937-Sep-23 01:30 < 00:01 Earth 0.29978294964706 0.299781528085237 0.299784371211933 14.1610220173274 14.1603943631047 2428799.562304778 0.188674996339434 85.5326670435817 6.07544122351818 34.1265448297207 3523302.17253727 T 634 CATAB v2.0g-lin.ifort 2021-Jul-03 06:40:59 2021-Jul-03 06:40
1970-Aug-18 03:36 < 00:01 Earth 0.223788283131043 0.223786059325378 0.223790506939672 16.8730353016336 16.872329649143 2440816.649654450 0.190540520643289 118.117664440141 2.62097755791088 -20.1526540000145 3945498.51498837 T 634 CATAB v2.0g-lin.ifort 2021-Jul-03 06:40:59 2021-Jul-03 06:40
1977-Sep-07 14:11 < 00:01 Earth 0.113706403567174 0.113704318105125 0.113708489128126 13.082102284644 13.0803109380255 2443394.091208992 0.234806112158119 196.963654865001 1.9534012557083 58.1341820668752 7170542.83162173 T 634 CATAB v2.0g-lin.ifort 2021-Jul-03 06:40:59 2021-Jul-03 06:40
1984-Oct-08 08:01 < 00:01 Earth 0.451047316373018 0.451045489327666 0.451049143420011 16.7695612937628 16.7692090258275 2445981.833946619 0.298110679802724 100.896693764658 9.50127300989891 25.5725231022045 2596747.58326213 T 634 CATAB v2.0g-lin.ifort 2021-Jul-03 06:40:59 2021-Jul-03 06:40
2010-Aug-11 12:57 < 00:01 Earth 0.338836371898551 0.338835947226014 0.338836796571127 19.2694064040316 19.2689983115475 2455420.039769258 0.0353567288002791 21.8397017844545 2.96807839175826 -14.2927861169239 4282323.15654313 T 634 CATAB v2.0g-lin.ifort 2021-Jul-03 06:40:59 2021-Jul-03 06:40
2017-Sep-01 12:06 < 00:01 Earth 0.0472367776008964 0.04723677134614 0.0472367838556528 13.5346212237131 13.530452982272 2457998.004056941 0.00251464039889256 2.78467758792567 0.308964747248706 -89.0971603580497 24838503.9586948 T 634 CATAB v2.0g-lin.ifort 2021-Jul-03 06:40:59 2021-Jul-03 06:40
2024-Oct-01 03:49 < 00:01 Earth 0.381687696073422 0.381687271900042 0.381688120246911 15.3070774421558 15.3066213859323 2460584.659305898 0.0629941241346585 23.8818819248791 8.08732292041525 29.5705017067315 3351829.32116007 T 634 CATAB v2.0g-lin.ifort 2021-Jul-03 06:40:59 2021-Jul-03 06:40
2050-Aug-11 02:01 < 00:01 Earth 0.348111664637749 0.348109765648061 0.34811356362809 19.5125451509753 19.5121528817613 2470029.583974684 0.15342447427514 97.59145817732 2.95310363774397 -14.0044400156169 3835392.25504547 T 634 CATAB v2.0g-lin.ifort 2021-Jul-03 06:40:59 2021-Jul-03 06:40
2057-Sep-02 00:41 < 00:01 Earth 0.0499579706848387 0.0499568713492729 0.0499590701718671 13.4723621744066 13.468402790253 2472608.528482251 0.221962863490008 147.757634210223 0.946012245202838 68.2226680347611 8390569.02387892 T 634 CATAB v2.0g-lin.ifort 2021-Jul-03 06:40:59 2021-Jul-03 06:40
2064-Oct-05 16:51 < 00:01 Earth 0.416621124345287 0.416617011915325 0.416625236784604 15.9546280873249 15.9542272299842 2475199.201865021 0.654820054027364 227.516347530249 9.18829691374232 25.6904104584131 2443911.05618272 T 634 CATAB v2.0g-lin.ifort 2021-Jul-03 06:40:59 2021-Jul-03 06:40
2090-Aug-17 14:28 < 00:01 Earth 0.23402595131944 0.234015114228798 0.234036788469732 17.1679103761164 17.1672471841016 2484646.102441147 0.919546537233707 571.618710552757 2.52788204207316 -19.0260305818375 4037217.48948254 T 634 CATAB v2.0g-lin.ifort 2021-Jul-03 06:40:59 2021-Jul-03 06:40
2097-Sep-11 03:08 00:01 Earth 0.155835037676893 0.155823475854277 0.155846601673479 12.9911485313941 12.9898323319619 2487227.630523345 1.35032750580575 1083.96551815927 2.55843560480973 57.8642843838743 6663144.20637893 T 634 CATAB v2.0g-lin.ifort 2021-Jul-03 06:40:59 2021-Jul-03 06:40
2123-Aug-05 05:20 < 00:01 Earth 0.472391563520632 0.472380677629624 0.472402449419614 22.4970367885589 22.4967860695136 2496685.722397722 0.856358682763928 551.403157280387 3.11830507634856 -10.117128247294 3582397.56691794 T 634 CATAB v2.0g-lin.ifort 2021-Jul-03 06:40:59 2021-Jul-03 06:40
2130-Aug-27 19:26 < 00:01 Earth 0.0869780552363975 0.0869687083625964 0.0869874027253373 14.6043359154347 14.6022381735868 2499265.309412950 0.973605159950126 591.877059325061 1.46674652821821 -38.0491889975412 4962036.80624116 T 634 CATAB v2.0g-lin.ifort 2021-Jul-03 06:40:59 2021-Jul-03 06:40
2137-Sep-24 01:04 00:01 Earth 0.289172140105471 0.289164766031841 0.289179514292356 13.8191895199496 13.8185227380341 2501849.544595626 1.04161561550033 465.483729515677 6.10956182175515 37.8229098282335 3641067.19733804 T 634 CATAB v2.0g-lin.ifort 2021-Jul-03 06:40:59 2021-Jul-03 06:40
2163-Aug-07 05:08 < 00:01 Earth 0.437994232362752 0.437989322341223 0.437999142386224 21.7008589586981 21.7005786285245 2511297.713607547 0.386500560149419 249.130422928647 2.98198590955153 -10.6495748413982 3652372.21819756 T 634 CATAB v2.0g-lin.ifort 2021-Jul-03 06:40:59 2021-Jul-03 06:40
2170-Aug-28 08:54 < 00:01 Earth 0.0781273182156425 0.0781202161500682 0.078134420743927 14.4959467371487 14.493593866228 2513875.871137937 0.774477882254515 464.046940730248 1.32752805585014 -40.2545463856011 5171742.26014312 T 634 CATAB v2.0g-lin.ifort 2021-Jul-03 06:40:59 2021-Jul-03 06:40
2177-Sep-22 14:01 00:01 Earth 0.272042356462921 0.272032963728912 0.272051749433262 13.5973326853637 13.5966123518699 2516458.084025645 1.3045405990481 615.863934570288 5.69185305156278 40.4925366245133 3896826.17516955 T 634 CATAB v2.0g-lin.ifort 2021-Jul-03 06:40:59 2021-Jul-03 06:40

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