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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 ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .145770183381878 3.619e-08  
a 3.11531552145663 1.9562e-08 au
q 2.661195406601486 1.1078e-07 au
i .3437474172520327 4.2131e-06 deg
node 256.7129092665817 0.00080013 deg
peri .20039129070304 0.00080032 deg
M 222.646797915936 1.6628e-05 deg
tp 2459366.780498189922
(2021-Jun-01.28049819)
9.3125e-05 TDB
period 2008.405884702545
5.50
1.8917e-05
5.179e-08
d
yr
n .1792466367192097 1.6883e-09 deg/d
Q 3.569435636311774 2.2414e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1395  
   data-arc span      17751 days (48.60 yr)  
   first obs. used      1971-03-24  
   last obs. used      2019-10-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52435  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 04:14:43  

Additional Information
 Earth MOID = 1.64589 au 
 Jupiter MOID = 1.48657 au 
 T_jup = 3.201 
[ 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 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-January); 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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