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19115 (1981 EM39)
Classification: Main-belt Asteroid          SPK-ID: 2019115
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09072948183161202 3.9513e-08  
a 2.291160282219424 8.6637e-09 au
q 2.083284497020486 8.949e-08 au
i 5.278174121717103 4.9696e-06 deg
node 358.5294480563789 4.309e-05 deg
peri 227.8336452654113 5.0254e-05 deg
M 66.49817207906473 2.6331e-05 deg
tp 2458766.514555740256
(2019-Oct-10.01455574)
9.2509e-05 TDB
period 1266.722938389265
3.47
7.1849e-06
1.967e-08
d
yr
n .2841979008114967 1.612e-09 deg/d
Q 2.499036067418362 9.4498e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1045  
   data-arc span      14425 days (39.49 yr)  
   first obs. used      1981-02-02  
   last obs. used      2020-08-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51517  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 01:24:51  

Additional Information
 Earth MOID = 1.07858 au 
 Jupiter MOID = 2.48708 au 
 T_jup = 3.587 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456845.5 (2014-Jul-07.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09087606271891151 3.9492e-08  
q 2.082007175233915 8.9328e-08 au
tp 2456233.778424895766
(2012-Nov-02.27842490)
9.1935e-05 TDB
node 358.5921973963582 4.3108e-05 deg
peri 227.7136049931692 5.0244e-05 deg
i 5.278274725184934 4.9686e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1045  
   data-arc span      14425 days (39.49 yr)  
   first obs. used      1981-02-02  
   last obs. used      2020-08-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51517  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 01:24:51  

Additional Information
 Jupiter MOID = 2.48708 au 
 T_jup = 3.587 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.55959165712447E-15 -3.514653109458067E-15 -8.848086259548066E-13 -7.786009274673326E-16 -2.424644229984768E-13 9.530062046698256E-16
q -3.514653109458067E-15 7.97941771702223E-15 1.984868270198837E-12 5.131991782033697E-16 5.509438459281055E-13 -2.175064023298665E-15
tp -8.848086259548066E-13 1.984868270198837E-12 8.451962030062223E-9 5.402856789976145E-12 2.383236237653028E-9 -2.217252654650846E-12
node -7.786009274673326E-16 5.131991782033697E-16 5.402856789976145E-12 1.858308064534885E-9 -1.848422998876096E-9 -1.149118323067713E-11
peri -2.424644229984768E-13 5.509438459281055E-13 2.383236237653028E-9 -1.848422998876096E-9 2.524432169342356E-9 1.086404447664547E-11
i 9.530062046698256E-16 -2.175064023298665E-15 -2.217252654650846E-12 -1.149118323067713E-11 1.086404447664547E-11 2.468723314729961E-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 15.5   n/a MPO384918  
diameter diameter 2.164 km 0.462 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.314   0.117 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

19115 (1981 EM39)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20001211/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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