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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1458438840687156 3.0936e-08  
a 3.113508578870676 1.5961e-08 au
q 2.65942239464691 9.8685e-08 au
i .3437795964176959 3.601e-06 deg
node 256.7067940011317 0.00076379 deg
peri .509446848544218 0.00076397 deg
M 5.115940122927277 1.6009e-05 deg
tp 2459367.983483052811
(2021-Jun-02.48348305)
8.9226e-05 TDB
period 2006.658767365323
5.49
1.543e-05
4.225e-08
d
yr
n .1794026995793949 1.3795e-09 deg/d
Q 3.567594763094442 1.8289e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1681  
   data-arc span      18357 days (50.26 yr)  
   first obs. used      1971-03-24  
   last obs. used      2021-06-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50358  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 04:39:12  

Additional Information
 Earth MOID = 1.64448 au 
 Jupiter MOID = 1.48733 au 
 T_jup = 3.202 
[ 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 13.79   n/a MPO614063  
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. 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:
[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

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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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