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30756 (1981 ET39)
Classification: Main-belt Asteroid          SPK-ID: 2030756
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1621296929051486 3.2306e-08  
a 3.177683485243306 1.9238e-08 au
q 2.662486637631047 1.0017e-07 au
i 4.242256001803139 4.6842e-06 deg
node 334.2022403359136 5.3724e-05 deg
peri 115.9329101970553 5.5965e-05 deg
M 103.8808163330982 1.553e-05 deg
tp 2458799.468514138462
(2019-Nov-11.96851414)
8.787e-05 TDB
period 2069.018539678851
5.66
1.8789e-05
5.144e-08
d
yr
n .1739955409272836 1.5801e-09 deg/d
Q 3.692880332855566 2.2358e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1125  
   data-arc span      14703 days (40.25 yr)  
   first obs. used      1981-02-09  
   last obs. used      2021-05-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47333  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 19:49:59  

Additional Information
 Earth MOID = 1.68258 au 
 Jupiter MOID = 1.52334 au 
 T_jup = 3.176 
[ 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 14.45   n/a E2021B10  
diameter diameter 8.210 km 0.307 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.055   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

30756 (1981 ET39)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20011130/Numbers.arcLast Updated: 2004-04-19

[ 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
1915-Sep-03 12:23 00:04 Jupiter 1.89912992554035 1.89912799455613 1.8991318565277 3.60497596657199 3.47905742897558 2420744.016085084 3.99458775054047 166.758820904506 28.2681013110889 63.8056514189294 2305453.91700481 T 29 CATAB v2.0g-lin.ifort 2021-Jul-08 19:50:04 2021-Jul-08 19:50
1926-Aug-10 11:59 00:03 Jupiter 1.69344418236379 1.69344298316159 1.69344538156627 2.63864130701146 2.44173568257972 2424737.999352443 3.40005876650419 97.3475097472327 20.4433013111579 78.2768099639895 1488703.81697183 T 29 CATAB v2.0g-lin.ifort 2021-Jul-08 19:50:04 2021-Jul-08 19:50
1937-Aug-09 06:30 00:03 Jupiter 1.60594692912832 1.60594654222933 1.60594731602712 2.05860065349492 1.78409059133153 2428754.770612905 2.73004512587541 79.8927746512695 31.4928265279992 71.2442883003514 1850580.86647085 T 29 CATAB v2.0g-lin.ifort 2021-Jul-08 19:50:04 2021-Jul-08 19:50
1948-Aug-18 06:55 00:02 Jupiter 1.65674454663552 1.65674394802569 1.65674514524536 1.81175424906213 1.50330939588408 2432781.788459542 2.2076754217315 71.2884079796696 37.8918660705206 63.3447334447032 2959232.60801272 T 29 CATAB v2.0g-lin.ifort 2021-Jul-08 19:50:04 2021-Jul-08 19:50
1959-Aug-20 03:05 00:02 Jupiter 1.82113697948446 1.82113618381425 1.82113777515447 2.06049806602971 1.82083481645948 2436800.628317001 1.77605355391533 51.5430446555826 9.30130304888683 75.5165621908093 1961616.96277509 T 29 CATAB v2.0g-lin.ifort 2021-Jul-08 19:50:04 2021-Jul-08 19:50
2058-May-24 18:17 00:01 Jupiter 1.93413549317697 1.9341347847621 1.93413620159196 3.70885590591784 3.58883621151065 2472873.261918237 1.18028425387097 56.9724766026446 25.2667950153624 73.8167685274096 2675246.56657648 T 29 CATAB v2.0g-lin.ifort 2021-Jul-08 19:50:04 2021-Jul-08 19:50
2069-Apr-26 07:34 00:02 Jupiter 1.69865263752364 1.69865198169814 1.69865329334923 2.69491777401465 2.50305699504926 2476862.815072902 1.51834957384699 77.4930708167909 18.7615922227399 83.9511622176401 2161475.1493557 T 29 CATAB v2.0g-lin.ifort 2021-Jul-08 19:50:04 2021-Jul-08 19:50
2080-Apr-21 07:30 00:02 Jupiter 1.57796784766995 1.5779674960018 1.57796819933792 2.12925825807066 1.86015578675855 2480875.812748421 1.87695970382699 73.1789130090939 26.3707976971943 83.5286239046457 2260758.87851828 T 29 CATAB v2.0g-lin.ifort 2021-Jul-08 19:50:04 2021-Jul-08 19:50
2091-May-02 15:12 00:02 Jupiter 1.61418801284595 1.61418723529631 1.61418879039558 1.88906248182523 1.58716260104757 2484904.133146510 2.39656272427253 77.2871784991515 39.6046201057402 64.9117981667308 2704463.07604361 T 29 CATAB v2.0g-lin.ifort 2021-Jul-08 19:50:04 2021-Jul-08 19:50
2102-May-05 09:23 00:03 Jupiter 1.78257099235683 1.78256952920643 1.78257245550622 2.04613067570778 1.79897545911792 2488923.890923592 3.03652841121193 62.9365878623139 21.0916999901481 65.3620779527205 1352494.81378093 T 29 CATAB v2.0g-lin.ifort 2021-Jul-08 19:50:04 2021-Jul-08 19:50

Alternate Designations
 1981 ET39 = 1998 FL144 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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