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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 635 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4231600896646802 5.8969e-09  
a 1.76884198167437 3.8389e-09 au
q 1.020338650106393 1.0894e-08 au
i 22.1451003915884 1.8495e-06 deg
node 336.0636516259496 1.2347e-06 deg
peri 27.85235836026234 3.9322e-06 deg
M 216.3086285839428 1.7568e-06 deg
tp 2459739.473189127394
(2022-Jun-08.97318913)
5.0967e-06 TDB
period 859.2746166250602
2.35
2.7973e-06
7.659e-09
d
yr
n .4189580292898191 1.3639e-09 deg/d
Q 2.517345313242347 5.4634e-09 au
  Orbit Determination Parameters
   # obs. used (total)      5046  
   # 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      .29933  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-10 06:26:51  

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 14.04   n/a MPO636110  
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 0.388075494038008 0.388074048149823 0.388076939926479 20.2912549988099 20.2909166295899 2423640.429307007 0.117795605623145 74.0653131190802 3.23305358522679 -13.242794935879 3740629.49439634 T 635 CATAB v2.0g-lin.ifort 2021-Aug-10 06:27:13 2021-Aug-10 06:27
1930-Aug-29 19:23 < 00:01 Earth 0.0523926303716128 0.0523919910224854 0.0523932697513469 13.9543947906682 13.9507498717529 2426218.307819210 0.111664528900302 70.7736905331012 0.958643016987568 -63.2367052315979 6714301.89505573 T 635 CATAB v2.0g-lin.ifort 2021-Aug-10 06:27:13 2021-Aug-10 06:27
1937-Sep-23 01:30 < 00:01 Earth 0.299782963151913 0.299781541988812 0.299784384318064 14.1610221786344 14.1603945244471 2428799.562305995 0.18861996282541 85.508693387727 6.07535848613796 34.1266140216725 3523360.67955875 T 635 CATAB v2.0g-lin.ifort 2021-Aug-10 06:27:13 2021-Aug-10 06:27
1970-Aug-18 03:36 < 00:01 Earth 0.223788271410267 0.223786048232087 0.223790494591423 16.8730350791258 16.8723294265889 2440816.649655280 0.190485522506825 118.084360297891 2.62094645441853 -20.1526891173106 3945552.15359577 T 635 CATAB v2.0g-lin.ifort 2021-Aug-10 06:27:13 2021-Aug-10 06:27
1977-Sep-07 14:11 < 00:01 Earth 0.113706413294742 0.113704328422965 0.11370849826537 13.0821022607277 13.0803109142592 2443394.091209402 0.234739161945745 196.910242585321 1.95241413723732 58.1346029011342 7173871.29956853 T 635 CATAB v2.0g-lin.ifort 2021-Aug-10 06:27:13 2021-Aug-10 06:27
1984-Oct-08 08:01 < 00:01 Earth 0.451047323992431 0.451045497460521 0.451049150525981 16.7695614637044 16.7692091957787 2445981.833947958 0.298019520468676 100.867223310458 9.50072127881509 25.5712412852417 2596808.91431005 T 635 CATAB v2.0g-lin.ifort 2021-Aug-10 06:27:13 2021-Aug-10 06:27
2010-Aug-11 12:57 < 00:01 Earth 0.338836370124596 0.338835945567952 0.338836794681278 19.269406357242 19.2689982647547 2455420.039769714 0.0353456753308753 21.833679643872 2.96803083370918 -14.2922109564504 4282493.4154311 T 635 CATAB v2.0g-lin.ifort 2021-Aug-10 06:27:13 2021-Aug-10 06:27
2017-Sep-01 12:06 < 00:01 Earth 0.0472367776091927 0.0472367713544551 0.047236783863933 13.5346212223716 13.5304529809308 2457998.004056992 0.00251460162546207 2.78419755398387 0.308963502655739 -89.0969554418814 24838720.9711449 T 635 CATAB v2.0g-lin.ifort 2021-Aug-10 06:27:13 2021-Aug-10 06:27
2024-Oct-01 03:49 < 00:01 Earth 0.381687694202307 0.38168727015722 0.381688118247524 15.3070774350471 15.3066213788211 2460584.659307128 0.0629810810442804 23.8757226553824 8.08663415504171 29.5764950932629 3352696.56123201 T 635 CATAB v2.0g-lin.ifort 2021-Aug-10 06:27:13 2021-Aug-10 06:27
2050-Aug-11 02:01 < 00:01 Earth 0.34811167483519 0.348109776411596 0.348113573259436 19.5125453923497 19.5121531231521 2470029.583973901 0.153380053977843 97.5624042429723 2.95306238875346 -14.0045336698432 3835498.7713389 T 635 CATAB v2.0g-lin.ifort 2021-Aug-10 06:27:13 2021-Aug-10 06:27
2057-Sep-02 00:41 < 00:01 Earth 0.04995796478974 0.0499568657824918 0.0499590639483599 13.4723622674492 13.4684028828556 2472608.528481746 0.221896811712931 147.712740663953 0.945909219544977 68.2225509857708 8391728.9639874 T 635 CATAB v2.0g-lin.ifort 2021-Aug-10 06:27:13 2021-Aug-10 06:27
2064-Oct-05 16:51 < 00:01 Earth 0.416621102297458 0.416616991100275 0.416625213503995 15.9546276734976 15.9542268161253 2475199.201864448 0.654631015091183 227.44929506321 9.18765750663034 25.6910240168489 2444145.69078523 T 635 CATAB v2.0g-lin.ifort 2021-Aug-10 06:27:13 2021-Aug-10 06:27
2090-Aug-17 14:28 < 00:01 Earth 0.234026010568772 0.23401517672062 0.23403684447654 17.1679115458136 17.1672483540118 2484646.102437816 0.919272160073499 571.447628429322 2.5278517381389 -19.0260157399679 4037263.75293154 T 635 CATAB v2.0g-lin.ifort 2021-Aug-10 06:27:13 2021-Aug-10 06:27
2097-Sep-11 03:08 00:01 Earth 0.155834973066782 0.155823414703335 0.155846533602885 12.9911484618163 12.9898322618313 2487227.630518287 1.34992380066809 1083.63912337349 2.55775925220586 57.8642162133004 6664418.58396147 T 635 CATAB v2.0g-lin.ifort 2021-Aug-10 06:27:13 2021-Aug-10 06:27
2123-Aug-05 05:20 < 00:01 Earth 0.472391627120716 0.472380744490428 0.47240250975898 22.4970383352592 22.4967876162649 2496685.722393645 0.856103677639335 551.238064751338 3.11822191901838 -10.1171710392028 3582518.14078161 T 635 CATAB v2.0g-lin.ifort 2021-Aug-10 06:27:13 2021-Aug-10 06:27
2130-Aug-27 19:26 < 00:01 Earth 0.086978110448728 0.086968766371981 0.0869874551402483 14.6043368013964 14.6022390610076 2499265.309408937 0.973313868652813 591.699542303418 1.46668609009178 -38.0491405786039 4962197.28851895 T 635 CATAB v2.0g-lin.ifort 2021-Aug-10 06:27:13 2021-Aug-10 06:27
2137-Sep-24 01:04 00:01 Earth 0.289172096510973 0.289164724644864 0.28917946849027 13.8191889996572 13.818522217616 2501849.544591405 1.04130596031675 465.344594101348 6.10947156163563 37.8229460035582 3641131.97253248 T 635 CATAB v2.0g-lin.ifort 2021-Aug-10 06:27:13 2021-Aug-10 06:27
2163-Aug-07 05:08 < 00:01 Earth 0.437994206613599 0.437989298071669 0.437999115157472 21.7008583398832 21.7005780096851 2511297.713609456 0.386382700758515 249.055279164199 2.98191285764088 -10.6494881522629 3652442.18047766 T 635 CATAB v2.0g-lin.ifort 2021-Aug-10 06:27:13 2021-Aug-10 06:27
2170-Aug-28 08:54 < 00:01 Earth 0.0781272796572655 0.0781201797295292 0.0781343800474365 14.4959461122181 14.4935932400347 2513875.871141332 0.774244638080174 463.90758334167 1.32747873309604 -40.2545950552972 5171897.47383461 T 635 CATAB v2.0g-lin.ifort 2021-Aug-10 06:27:13 2021-Aug-10 06:27
2177-Sep-22 14:01 00:01 Earth 0.272042408256783 0.272033018348593 0.272051798401168 13.597333222631 13.5966128893028 2516458.084031106 1.30414657811978 615.678656903266 5.69177645361012 40.4925386684663 3896880.34728937 T 635 CATAB v2.0g-lin.ifort 2021-Aug-10 06:27:13 2021-Aug-10 06:27

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