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190304 (1997 EP4)
Classification: Main-belt Asteroid          SPK-ID: 2190304
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08040047787974369 5.8476e-08  
a 2.775859780141274 2.1001e-08 au
q 2.552679327290755 1.6637e-07 au
i .8467951357947295 4.6335e-06 deg
node 60.0947762908808 0.00043621 deg
peri 278.0748309305648 0.00043716 deg
M 255.0019079613114 3.127e-05 deg
tp 2459693.189855318497
(2022-Apr-23.68985532)
0.00014839 TDB
period 1689.253056610821
4.62
1.917e-05
5.248e-08
d
yr
n .2131119423411164 2.4184e-09 deg/d
Q 2.999040232991793 2.2689e-08 au
  Orbit Determination Parameters
   # obs. used (total)      374  
   data-arc span      8476 days (23.21 yr)  
   first obs. used      1997-03-02  
   last obs. used      2020-05-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .57484  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 22:07:05  

Additional Information
 Earth MOID = 1.54167 au 
 Jupiter MOID = 2.29161 au 
 T_jup = 3.330 
[ 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 16.18   n/a E2021B55  
diameter diameter 3.717 km 0.628 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.035   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

190304 (1997 EP4)          Discovered 1997-Mar-02 by Spacewatch at Kitt Peak
Reference: 20080917/Numbers.arcLast Updated: 2008-09-19

[ 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
1990-Jan-04 20:27 00:02 Psych 0.0263411987541543 0.0263339806045297 0.0263484172692372 1.99630431200937 1.99630408192299 2447896.352255792 1.77082949087432 391.836152040038 66.7837002410833 -24.0448160366927 25642.6043800965 T 21 CATAB v2.0f-lin.ifort 2021-Apr-13 22:07:06 2021-Apr-13 22:07

Alternate Designations
 1997 EP4 = 1999 VY203 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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