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17396 (1981 EK45)
Classification: Main-belt Asteroid          SPK-ID: 2017396
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1191075850346703 4.4491e-08  
a 2.352444082420281 9.1132e-09 au
q 2.0722501488341 1.0546e-07 au
i 6.464019607840236 4.8592e-06 deg
node 332.4916188329677 3.0568e-05 deg
peri 6.456702652555938 3.413e-05 deg
M 211.5942544155635 1.6295e-05 deg
tp 2459743.782360988703
(2022-Jun-13.28236099)
6.1182e-05 TDB
period 1317.884622227484
3.61
7.6581e-06
2.097e-08
d
yr
n .2731650357916228 1.5873e-09 deg/d
Q 2.632638016006461 1.0199e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1039  
   data-arc span      25671 days (70.28 yr)  
   first obs. used      1950-12-09  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55067  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 02:32:41  

Additional Information
 Earth MOID = 1.06135 au 
 Jupiter MOID = 2.71787 au 
 T_jup = 3.539 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456842.5 (2014-Jul-04.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1198585143348329 4.4652e-08  
q 2.070481443227615 1.0599e-07 au
tp 2457106.277426055048
(2015-Mar-24.77742606)
5.4377e-05 TDB
node 332.5753331945032 3.0529e-05 deg
peri 6.065781341506173 3.4026e-05 deg
i 6.469359262391843 4.8618e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1039  
   data-arc span      25671 days (70.28 yr)  
   first obs. used      1950-12-09  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55067  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 02:32:41  

Additional Information
 Jupiter MOID = 2.71787 au 
 T_jup = 3.539 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.993772167362794E-15 -4.71911832803759E-15 -1.737253919914497E-13 -1.752759665254382E-15 -7.218995617960039E-14 2.481965052938993E-16
q -4.71911832803759E-15 1.123334723513569E-14 5.356460195807204E-13 4.084966875288208E-15 1.995181000400197E-13 -6.000230358122472E-16
tp -1.737253919914497E-13 5.356460195807204E-13 2.956907397067717E-9 -3.13778378157628E-12 8.23614440020385E-10 -9.963933135838314E-13
node -1.752759665254382E-15 4.084966875288208E-15 -3.13778378157628E-12 9.320237548504405E-10 -9.263920879030749E-10 -9.760007932629796E-13
peri -7.218995617960039E-14 1.995181000400197E-13 8.23614440020385E-10 -9.263920879030749E-10 1.15777165576476E-9 7.33813800672267E-13
i 2.481965052938993E-16 -6.000230358122472E-16 -9.963933135838314E-13 -9.760007932629796E-13 7.33813800672267E-13 2.363713749697893E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.47   n/a E2021B10  
diameter diameter 2.411 km 0.464 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 10.360 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.277   0.135 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

17396 (1981 EK45)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20001013/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 EK45 = 1995 BV10 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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