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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1457625833573163 3.1008e-08  
a 3.113314951857937 1.6494e-08 au
q 2.659510121670165 9.9172e-08 au
i .3437948633017676 3.6029e-06 deg
node 256.7091182111257 0.00078043 deg
peri .4566145252721194 0.00078062 deg
M 329.9870756472461 1.6662e-05 deg
tp 2459367.777999389928
(2021-Jun-02.27799939)
9.3009e-05 TDB
period 2006.471581128964
5.49
1.5945e-05
4.366e-08
d
yr
n .1794194362809973 1.4258e-09 deg/d
Q 3.567119782045708 1.8898e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1637  
   data-arc span      18184 days (49.79 yr)  
   first obs. used      1971-03-24  
   last obs. used      2021-01-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50883  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:34:07  

Additional Information
 Earth MOID = 1.64282 au 
 Jupiter MOID = 1.48883 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 13.78   n/a MPCxxxxx  
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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1941-Dec-24 15:55 00:02 Jupiter 1.52003571371501 1.52003503002254 1.520036397408 1.28077181303441 0.72518916052933 2430353.163264100 1.78922279820944 476.899659548334 126.41601921261 -17.3822682108567 2175309.93905723 T 32 CATAB v2.0f-lin.ifort 2021-Apr-13 02:34:15 2021-Apr-13 02:34
1951-Nov-26 05:56 00:02 Jupiter 1.66646249195978 1.66646155562527 1.66646342829477 2.03672410533302 1.7696591579794 2433976.747211113 1.5372470980206 103.717407636911 14.4899628651714 79.4649749372834 2149993.23968246 T 32 CATAB v2.0f-lin.ifort 2021-Apr-13 02:34:15 2021-Apr-13 02:34
2013-Mar-01 02:59 < 00:01 Jupiter 1.51541537605511 1.51541506925457 1.51541568285723 1.26730517649953 0.698704065833891 2456352.624403729 0.218725351467859 405.974945874549 135.341298677838 -16.3854747908337 2677392.83051059 T 32 CATAB v2.0f-lin.ifort 2021-Apr-13 02:34:15 2021-Apr-13 02:34
2023-Feb-01 02:35 < 00:01 Jupiter 1.68778898678405 1.68778847947437 1.68778949409364 2.13133209615155 1.88118841655273 2459976.607490656 0.354221864336849 44.0446626607233 8.46188688076814 -89.4895690800999 2313525.20175364 T 32 CATAB v2.0f-lin.ifort 2021-Apr-13 02:34:15 2021-Apr-13 02:34
2084-May-12 20:05 00:02 Jupiter 1.51463825498583 1.51463763717756 1.51463887279625 1.26348088251909 0.691328684077041 2482358.336573176 1.75501643400241 573.101351948457 139.327763075526 -18.0956184145849 2307468.41408655 T 32 CATAB v2.0f-lin.ifort 2021-Apr-13 02:34:15 2021-Apr-13 02:34
2094-Apr-16 00:51 00:02 Jupiter 1.70345710060423 1.70345586073931 1.70345834047041 2.20171690956781 1.96292705682167 2485983.535421657 2.06937301362409 121.564756237632 5.84997849352923 89.6579523890201 2179196.86230818 T 32 CATAB v2.0f-lin.ifort 2021-Apr-13 02:34:15 2021-Apr-13 02:34
2155-Aug-02 15:42 00:03 Jupiter 1.51501989621855 1.51501885382556 1.51502093861454 1.26206291327807 0.688938276559198 2508371.154089571 3.4649826164507 789.583973824958 141.288669731686 -18.9984595462178 2083706.6198855 T 32 CATAB v2.0f-lin.ifort 2021-Apr-13 02:34:15 2021-Apr-13 02:34
2165-Jul-06 05:53 00:04 Jupiter 1.71512302065616 1.71512084856138 1.71512519275543 2.25296472316318 2.02191482024819 2511996.745118156 3.80043223398844 209.771864858103 4.37447442326006 -88.7107504406396 2143194.26048297 T 32 CATAB v2.0f-lin.ifort 2021-Apr-13 02:34:15 2021-Apr-13 02:34

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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