Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
18645 (1998 EM19)
Classification: Main-belt Asteroid          SPK-ID: 2018645
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ hide orbit diagram ]

For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456685.5 (2014-Jan-28.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1448568997207815 3.1163e-08  
q 2.668039056766983 9.9162e-08 au
tp 2457353.423505620191
(2015-Nov-26.92350562)
9.2988e-05 TDB
node 257.0162827381044 0.00077996 deg
peri 358.8560032164361 0.00078015 deg
i .3435983843557243 3.6015e-06 deg
  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
 Jupiter MOID = 1.48883 au 
 T_jup = 3.202 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.711316828832118E-16 -3.058606980378627E-15 -3.992194793799166E-13 2.662655736665189E-14 -8.576589203306157E-14 5.7521866617863E-18
q -3.058606980378627E-15 9.833116624377919E-15 1.189953172934839E-12 -1.586490355897944E-13 3.137667405928669E-13 -9.014168042339225E-17
tp -3.992194793799166E-13 1.189953172934839E-12 8.646693331493445E-9 -8.674635477291846E-11 1.613668363050665E-9 8.502930518064057E-14
node 2.662655736665189E-14 -1.586490355897944E-13 -8.674635477291846E-11 6.083433633834925E-7 -6.083518321119753E-7 -3.986153679601789E-10
peri -8.576589203306157E-14 3.137667405928669E-13 1.613668363050665E-9 -6.083518321119753E-7 6.086393702073295E-7 3.986269334033894E-10
i 5.7521866617863E-18 -9.014168042339225E-17 8.502930518064057E-14 -3.986153679601789E-10 3.986269334033894E-10 1.297106683427506E-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 13.78   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

[ 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jun-23 00:45 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin