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18645 (1998 EM19)
Classification: Main-belt Asteroid          SPK-ID: 2018645
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1458311227656459 3.1015e-08  
a 3.113987203084342 1.6562e-08 au
q 2.659870952980699 9.9202e-08 au
i .3437744624443718 3.6028e-06 deg
node 256.7197812134461 0.00078061 deg
peri .366753717070416 0.0007808 deg
M 294.1826600243493 1.6628e-05 deg
tp 2459367.453882926640
(2021-Jun-01.95388293)
9.3008e-05 TDB
period 2007.121495679745
5.50
1.6013e-05
4.384e-08
d
yr
n .1793613394978265 1.4309e-09 deg/d
Q 3.568103453187985 1.8977e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1632  
   data-arc span      17959 days (49.17 yr)  
   first obs. used      1971-03-24  
   last obs. used      2020-05-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50953  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:13:44  

Additional Information
 Earth MOID = 1.64485 au 
 Jupiter MOID = 1.48867 au 
 T_jup = 3.202 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456683.5 (2014-Jan-26.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1448519994933574 3.1164e-08  
q 2.668095704600886 9.9163e-08 au
tp 2457353.398797100450
(2015-Nov-26.89879710)
9.3033e-05 TDB
node 257.0173356551978 0.00078011 deg
peri 358.848506410821 0.0007803 deg
i .3436044792292635 3.6017e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1632  
   data-arc span      17959 days (49.17 yr)  
   first obs. used      1971-03-24  
   last obs. used      2020-05-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50953  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:13:44  

Additional Information
 Jupiter MOID = 1.48867 au 
 T_jup = 3.202 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.711813373427703E-16 -3.058686263815151E-15 -3.995819198935784E-13 2.663989539054763E-14 -8.584823294965411E-14 5.835068528068408E-18
q -3.058686263815151E-15 9.833305238542446E-15 1.192219585925715E-12 -1.586099335250221E-13 3.14110471712771E-13 -9.101022212500412E-17
tp -3.995819198935784E-13 1.192219585925715E-12 8.655210186983585E-9 -8.728918782389238E-11 1.615454514308842E-9 8.534459934357599E-14
node 2.663989539054763E-14 -1.586099335250221E-13 -8.728918782389238E-11 6.085767933050212E-7 -6.085853518472509E-7 -3.980616282210113E-10
peri -8.584823294965411E-14 3.14110471712771E-13 1.615454514308842E-9 -6.085853518472509E-7 6.088731586369623E-7 3.980732668591575E-10
i 5.835068528068408E-18 -9.101022212500412E-17 8.534459934357599E-14 -3.980616282210113E-10 3.980732668591575E-10 1.297245991054685E-11

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 13.7   n/a MPO435872  
diameter diameter 10.490 km 0.160 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.693 h n/a LCDB (Rev. 2019-August); 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:
[Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.044   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18645 (1998 EM19)          Discovered 1998-Mar-03 by Elst, E. W. at La Silla
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 EM19 = 1995 WV40 = 2000 QO83 = 2000 QP129 = 2014 T-1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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