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3122 Florence (1981 ET3)
Classification: Amor [NEO, PHA]          SPK-ID: 2003122
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 284 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4227883797185601 6.7264e-08  
a 1.768293076124635 5.0771e-09 AU
q 1.020679311602352 1.1914e-07 AU
i 22.162628466419 7.0461e-06 deg
node 336.1218188891789 1.1836e-05 deg
peri 27.70418514027394 1.3903e-05 deg
M 292.5171339197501 1.0655e-05 deg
tp 2457161.498123827897
(2015-May-18.99812383)
2.5769e-05 JED
period 858.8746735966764
2.35
3.699e-06
1.013e-08
d
yr
n .4191531210164131 1.8052e-09 deg/d
Q 2.515906840646918 7.2236e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      1598  
   data-arc span      12812 days (35.08 yr)  
   first obs. used      1979-03-09  
   last obs. used      2014-04-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49167  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jan-08 00:00:45  

Additional Information
 Earth MOID = .0453336 AU 
 T_jup = 3.921 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.1 mag n/a MPO259359  
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. 2015-July); Warner et al., 2009 Published Reference List:
[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 Bul. 39, 101-102.]
[Linder, T.; Sampson, R.; Holmes, R. (2013) Minor Planet Bul. 40, 4-6.]
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 0.388074599738943 0.388071436346606 0.388077763129659 20.2912387862119 20.2909004159419 2423640.429328228 0.0662738536499287 151.024161408319 12.5426391764072 1.68486725005673 357128.098233695 T 284 CATAB v2.0c-linF95 2015-Jan-08 00:00:50 2015-Jan-08 00:00
1930-Aug-29 19:23 < 00:01 Earth 0.0523921821949448 0.0523909107659078 0.0523934536822835 13.9543894814666 13.9507445299811 2426218.307840776 0.0751567456538404 87.8060563946719 13.6552227651779 -55.7761250955847 372514.015869501 T 284 CATAB v2.0c-linF95 2015-Jan-08 00:00:50 2015-Jan-08 00:00
1937-Sep-23 01:30 < 00:01 Earth 0.299783822710828 0.299781474793495 0.299786170626139 14.1610336695501 14.1604060176719 2428799.562369376 0.0714996848382938 101.014226498209 14.3223573849019 -6.11426114251725 434529.13484797 T 284 CATAB v2.0c-linF95 2015-Jan-08 00:00:50 2015-Jan-08 00:00
1970-Aug-18 03:36 < 00:01 Earth 0.223786898470937 0.223784284073158 0.223789512866198 16.8730126049549 16.872306947149 2440816.649706985 0.0625330762705952 116.047671495957 12.643537486285 -3.47651465378096 274868.509474635 T 284 CATAB v2.0c-linF95 2015-Jan-08 00:00:50 2015-Jan-08 00:00
1977-Sep-07 14:11 < 00:01 Earth 0.113707659821569 0.113705374536695 0.113709945113203 13.0821011818584 13.0803098548815 2443394.091284425 0.0850339768606549 92.3008184005024 13.4222168714329 20.9171586391035 368110.462537683 T 284 CATAB v2.0c-linF95 2015-Jan-08 00:00:50 2015-Jan-08 00:00
1984-Oct-08 08:01 < 00:01 Earth 0.451048389413559 0.451046482239563 0.451050296587501 16.7695852172426 16.769232950648 2445981.834066827 0.0518290546162666 93.9542832109906 13.9961406666691 -11.8894265877472 1013029.80076917 T 284 CATAB v2.0c-linF95 2015-Jan-08 00:00:50 2015-Jan-08 00:00
2010-Aug-11 12:57 < 00:01 Earth 0.338836110961169 0.338834935703156 0.338837286218952 19.2694047635873 19.2689966707543 2455420.039753079 0.0191722510815227 54.3126155592142 11.4120429125887 6.02601230163752 898894.132989103 T 284 CATAB v2.0c-linF95 2015-Jan-08 00:00:50 2015-Jan-08 00:00
2017-Sep-01 12:06 < 00:01 Earth 0.0472367207613912 0.0472362657454752 0.0472371757950809 13.53462374557 13.5304554998901 2457998.004028762 0.0438232003542453 52.6508877217006 12.2322328179652 76.5576134646092 433992.030318729 T 284 CATAB v2.0c-linF95 2015-Jan-08 00:00:50 2015-Jan-08 00:00
2024-Oct-01 03:49 < 00:01 Earth 0.381687412393382 0.381684170754808 0.381690654029669 15.3070726482676 15.3066165915623 2460584.659269710 0.0924281767949689 150.626085479491 13.1472745091478 -8.92504114696617 622804.460401995 T 284 CATAB v2.0c-linF95 2015-Jan-08 00:00:50 2015-Jan-08 00:00
2050-Aug-11 02:01 < 00:01 Earth 0.34811275066645 0.348102482337384 0.348123018973137 19.512573156889 19.5121808894619 2470029.583882913 0.199070396998126 482.482543889824 11.9029190839345 0.965264990566547 113183.113143955 T 284 CATAB v2.0c-linF95 2015-Jan-08 00:00:50 2015-Jan-08 00:00
2057-Sep-02 00:41 < 00:01 Earth 0.0499572824796514 0.0499516424025061 0.0499629246512623 13.4723752455545 13.4684158106922 2472608.528366124 0.389657305833249 444.718905201451 12.2376655544776 61.5644973891496 413402.919608629 T 284 CATAB v2.0c-linF95 2015-Jan-08 00:00:50 2015-Jan-08 00:00
2064-Oct-05 16:50 < 00:01 Earth 0.416618745019342 0.416597382988905 0.416640107030133 15.9545797847866 15.954178923943 2475199.201598376 0.506563807507198 1033.62621942653 13.2287951729223 -13.2439764100275 885728.666656407 T 284 CATAB v2.0c-linF95 2015-Jan-08 00:00:50 2015-Jan-08 00:00
2090-Aug-17 14:27 00:01 Earth 0.234031945394014 0.233975499749166 0.234088389908742 17.1680324462985 17.1673692759854 2484646.102056759 1.36341019243559 2534.21189710051 11.8990916076328 -4.11104584870846 176773.299985141 T 284 CATAB v2.0c-linF95 2015-Jan-08 00:00:50 2015-Jan-08 00:00
2097-Sep-11 03:07 00:02 Earth 0.155828621298615 0.155768539761125 0.155888703228305 12.9911434306065 12.9898271764592 2487227.629981016 2.10999327535508 2312.92726163441 12.2338324795511 9.06450299086434 227476.638432918 T 284 CATAB v2.0c-linF95 2015-Jan-08 00:00:50 2015-Jan-08 00:00
2123-Aug-05 05:20 < 00:01 Earth 0.472397545047585 0.472340907392441 0.47245418245805 22.4971834714042 22.4969327571682 2496685.722038606 0.96067955366082 2762.5197177839 11.7696977431264 3.43325504654706 322485.819875877 T 284 CATAB v2.0c-linF95 2015-Jan-08 00:00:50 2015-Jan-08 00:00
2130-Aug-27 19:25 00:02 Earth 0.0869831811598511 0.0869345133076449 0.0870318544379989 14.6044213459669 14.6023237400204 2499265.309011080 1.66126583617625 2212.69781548789 12.0070928551924 -26.0217291428122 377506.770136351 T 284 CATAB v2.0c-linF95 2015-Jan-08 00:00:50 2015-Jan-08 00:00
2137-Sep-24 01:04 00:01 Earth 0.289168030050449 0.289129845752985 0.28920621382412 13.8191418280487 13.8184750343546 2501849.544175699 1.16169042512548 1614.96183365931 12.6844380377476 -6.06921451714148 280959.531727316 T 284 CATAB v2.0c-linF95 2015-Jan-08 00:00:50 2015-Jan-08 00:00
2163-Aug-07 05:08 < 00:01 Earth 0.437991581877879 0.437965861908918 0.438017301776831 21.7008008087967 21.7005204761756 2511297.713719146 0.469602715626638 1245.30091263536 11.763993663582 2.48996054298253 219743.287140689 T 284 CATAB v2.0c-linF95 2015-Jan-08 00:00:50 2015-Jan-08 00:00
2170-Aug-28 08:55 00:01 Earth 0.0781234399268876 0.0780863693881533 0.0781605155873469 14.4958882819771 14.4935352847535 2513875.871399640 1.34895050387983 1733.9588393446 12.0427207962502 -29.6213768681087 379825.297938028 T 284 CATAB v2.0c-linF95 2015-Jan-08 00:00:50 2015-Jan-08 00:00
2177-Sep-22 14:02 00:02 Earth 0.272047406367065 0.271998187903627 0.272096623970788 13.5973859510259 13.5966656337257 2516458.084495721 1.53557684157497 2042.24304538343 12.61835944926 -5.44625526591027 236762.726124911 T 284 CATAB v2.0c-linF95 2015-Jan-08 00:00:50 2015-Jan-08 00:00

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