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 ]

[ show orbit diagram ]
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 
[ 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-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

[ 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 1.52003569564991 1.52003500237153 1.5200363889289 1.28077183991337 0.725189194623708 2430353.163195689 1.7994309029941 486.271121910886 128.176011533601 -17.4217619446633 2146432.34537442 T 29 CATAB v2.0f-lin.ifort 2020-May-20 04:51:40 2020-May-20 04:51
1951-Nov-26 05:56 00:02 Jupiter 1.66646258456346 1.6664616461214 1.6664635230061 2.0367245180442 1.76965964734781 2433976.747133064 1.54642211247221 104.417505843716 14.6573997760051 79.5972141804873 2130337.14794328 T 29 CATAB v2.0f-lin.ifort 2020-May-20 04:51:40 2020-May-20 04:51
2013-Mar-01 02:59 < 00:01 Jupiter 1.51541542828284 1.51541511855952 1.5154157380078 1.26730548288418 0.698704644703264 2456352.624426613 0.219771329278913 410.727926866028 137.071954827409 -16.3075232147552 2641947.29291478 T 29 CATAB v2.0f-lin.ifort 2020-May-20 04:51:40 2020-May-20 04:51
2023-Feb-01 02:35 < 00:01 Jupiter 1.68778898007864 1.68778846947852 1.68778949067868 2.13133203467785 1.88118834437119 2459976.607514865 0.35756903791496 44.5939434858718 8.55211361827435 -89.521263712733 2293842.02646651 T 29 CATAB v2.0f-lin.ifort 2020-May-20 04:51:40 2020-May-20 04:51
2084-May-12 20:05 00:02 Jupiter 1.51463841502443 1.51463779682995 1.51463903322098 1.26348144438639 0.691329791954064 2482358.336817920 1.77076872558038 574.311213753585 140.997629489556 -17.9925287836138 2282253.2745274 T 29 CATAB v2.0f-lin.ifort 2020-May-20 04:51:40 2020-May-20 04:51
2094-Apr-16 00:51 00:02 Jupiter 1.70345683514389 1.70345558313423 1.70345808715472 2.20171564697583 1.96292559976046 2485983.535717514 2.08651515385993 122.585888893431 5.94115354237933 89.6136657727056 2155587.54446321 T 29 CATAB v2.0f-lin.ifort 2020-May-20 04:51:40 2020-May-20 04:51
2155-Aug-02 15:42 00:04 Jupiter 1.5150200932498 1.51501904803509 1.51502113846745 1.26206357784412 0.688939595029753 2508371.154403224 3.49375012707049 790.499546654311 142.849234900418 -18.927067101501 2059688.85778582 T 29 CATAB v2.0f-lin.ifort 2020-May-20 04:51:40 2020-May-20 04:51
2165-Jul-06 05:53 00:04 Jupiter 1.71512269610992 1.71512050443107 1.71512488779336 2.25296311414122 2.0219129797905 2511996.745441741 3.83072584627904 211.41362979105 4.43562574441441 -88.7332105452514 2121516.27400803 T 29 CATAB v2.0f-lin.ifort 2020-May-20 04:51:40 2020-May-20 04:51

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-Aug-11 20:28 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin