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.


[ revert to old Java-based viewer ]

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1458311176365882 3.1346e-08  
a 3.113987200289858 1.6749e-08 au
q 2.659870966565558 9.9928e-08 au
i .3437753485551726 3.6603e-06 deg
node 256.7197716215839 0.00078065 deg
peri .3667642402702775 0.00078084 deg
M 294.182660075607 1.6629e-05 deg
tp 2459367.453882146906
(2021-Jun-01.95388215)
9.3013e-05 TDB
period 2007.121492977967
5.50
1.6194e-05
4.434e-08
d
yr
n .179361339739264 1.4471e-09 deg/d
Q 3.568103434014159 1.9192e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1605  
   data-arc span      17933 days (49.10 yr)  
   first obs. used      1971-03-24  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50953  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 04:51:25  

Additional Information
 Earth MOID = 1.64485 au 
 Jupiter MOID = 1.48867 au 
 T_jup = 3.202 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456619.5 (2013-Nov-23.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1446862743520674 3.1534e-08  
q 2.669959683229234 9.9946e-08 au
tp 2457352.527218864540
(2015-Nov-26.02721886)
9.3217e-05 TDB
node 257.0476834587877 0.00077917 deg
peri 358.5993222058995 0.00077936 deg
i .3438125006083069 3.6609e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1605  
   data-arc span      17933 days (49.10 yr)  
   first obs. used      1971-03-24  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50953  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 04:51:25  

Additional Information
 Jupiter MOID = 1.48867 au 
 T_jup = 3.202 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.944219753509659E-16 -3.118933953265325E-15 -4.234165954532505E-13 2.484360076273398E-14 -9.07480158638147E-14 8.094296249117276E-18
q -3.118933953265325E-15 9.989183441361576E-15 1.269635133589099E-12 -1.490244699564697E-13 3.247730904827178E-13 -1.139289228259447E-16
tp -4.234165954532505E-13 1.269635133589099E-12 8.689437408583535E-9 -9.04583376651006E-11 1.623690460039927E-9 8.857226087617427E-14
node 2.484360076273398E-14 -1.490244699564697E-13 -9.04583376651006E-11 6.071021452504543E-7 -6.071112567483213E-7 -4.035213998109779E-10
peri -9.07480158638147E-14 3.247730904827178E-13 1.623690460039927E-9 -6.071112567483213E-7 6.074005676098027E-7 4.035339418478717E-10
i 8.094296249117276E-18 -1.139289228259447E-16 8.857226087617427E-14 -4.035213998109779E-10 4.035339418478717E-10 1.340190374400291E-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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Oct-01 09:06 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin