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 ]  
19108 (1981 EV21)
Classification: Main-belt Asteroid          SPK-ID: 2019108
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1103502021680378 3.6578e-08  
a 3.009024984857246 1.8428e-08 au
q 2.676978469449572 1.1874e-07 au
i 10.582172648 6.346e-06 deg
node 354.849780995421 1.8737e-05 deg
peri 82.26933041734473 3.7846e-05 deg
M 308.0623513793659 3.0693e-05 deg
tp 2459475.553325895173
(2021-Sep-18.05332590)
0.00016256 TDB
period 1906.501352140981
5.22
1.7514e-05
4.795e-08
d
yr
n .1888275608069849 1.7346e-09 deg/d
Q 3.34107150026492 2.0461e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1071  
   data-arc span      14612 days (40.01 yr)  
   first obs. used      1981-02-09  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51105  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:46:00  

Additional Information
 Earth MOID = 1.7173 au 
 Jupiter MOID = 1.94668 au 
 T_jup = 3.215 
[ 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 14.52   n/a E2021B10  
diameter diameter 4.017 km 0.527 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 3.389 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.209   0.074 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

19108 (1981 EV21)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20001211/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
2009-Oct-27 10:04 < 00:01 Jupiter 1.96570029194399 1.96569969079977 1.9657008930881 4.28733131843528 4.18561913453091 2455131.919549057 0.267378631370999 60.1488241506026 25.7367370036178 83.0884265056526 2386601.03109001 T 25 CATAB v2.0f-lin.ifort 2021-Apr-13 02:46:05 2021-Apr-13 02:46
2056-May-31 05:25 00:01 Jupiter 1.98300905204929 1.98300849874935 1.98300960534924 3.449480228633 3.32334678041298 2472149.725819424 1.18011022790637 59.0933809912281 19.0017689622069 76.6426727346464 1990832.14542106 T 25 CATAB v2.0f-lin.ifort 2021-Apr-13 02:46:05 2021-Apr-13 02:46
2140-May-28 02:03 00:03 Jupiter 1.95623419624225 1.95623346984604 1.95623492263908 4.34077438179026 4.2398525600752 2502826.585483404 3.28296808734377 109.266567492959 25.7898818269426 81.3138022054435 1870409.79337938 T 25 CATAB v2.0f-lin.ifort 2021-Apr-13 02:46:05 2021-Apr-13 02:46
2187-Jan-02 06:47 00:05 Jupiter 1.95819447439302 1.95819370942446 1.95819523936325 3.56424716044824 3.44074878657245 2519846.782922297 4.76039762536021 130.725486536456 21.199459598408 69.028556331754 1836647.84613865 T 25 CATAB v2.0f-lin.ifort 2021-Apr-13 02:46:05 2021-Apr-13 02:46

Alternate Designations
 1981 EV21 = 1999 RB186 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-May-08 23:40 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin