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4924 Hiltner (1981 EQ40)
Classification: Main-belt Asteroid          SPK-ID: 2004924
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 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2144550339963948 3.3312e-08  
a 2.15378517384567 6.9198e-09 au
q 1.691895101167666 7.3102e-08 au
i 1.731213654440804 4.2711e-06 deg
node 180.0544107846744 0.00010957 deg
peri 148.715045631566 0.00011018 deg
M 7.82073508529191 1.5163e-05 deg
tp 2458975.418871352119
(2020-May-05.91887135)
4.8541e-05 TDB
period 1154.521437533159
3.16
5.564e-06
1.523e-08
d
yr
n .311817510092497 1.5027e-09 deg/d
Q 2.615675246523675 8.4038e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1554  
   data-arc span      14417 days (39.47 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-07-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56307  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 23:21:32  

Additional Information
 Earth MOID = .681018 au 
 Jupiter MOID = 2.73365 au 
 T_jup = 3.672 
[ 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 15.1   n/a MPO384798  
diameter diameter 2.263 km 0.248 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.9 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Binzel, R.P.; Xu, S.; Bus, S.J.; Bowell, E. (1992) Icarus 99, 225-237; Science 257, 779-782.]
geometric albedo albedo 0.236   0.107 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4924 Hiltner (1981 EQ40)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ 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
1917-Jun-03 11:04 < 00:01 Hebe 0.0487095759650919 0.0487045945033438 0.0487145576406369 4.7406069337594 4.74060690683728 2421382.960868093 0.804847050783005 296.202804099145 22.8621585769401 -33.1565484177561 175452.340083018 T 23 CATAB v2.0f-lin.ifort 2020-Aug-24 23:21:46 2020-Aug-24 23:21
1939-May-08 14:00 < 00:01 Eunom 0.044307769665781 0.044303911055345 0.0443116283730539 4.39006900319885 4.39006893103119 2429392.083671791 0.888491416365918 218.400902539188 17.9044390081196 -28.4335757419261 178120.168333991 T 23 CATAB v2.0f-lin.ifort 2020-Aug-24 23:21:46 2020-Aug-24 23:21
2046-Oct-24 07:08 < 00:01 Eunom 0.0390842264303136 0.0390815416565509 0.0390869112288498 4.39353103668532 4.39353095493703 2468642.797363708 0.683335587179774 142.605232571392 17.4617796724951 -20.4448905597068 122998.241809995 T 23 CATAB v2.0f-lin.ifort 2020-Aug-24 23:21:46 2020-Aug-24 23:21
2154-Apr-12 20:22 00:02 Eunom 0.0290368008766803 0.0290273562924619 0.0290462457212597 4.41810825929097 4.41810814986793 2507894.348708308 2.02825621311555 490.115705850135 16.965109460799 -16.2480368838738 72075.962577302 T 23 CATAB v2.0f-lin.ifort 2020-Aug-24 23:21:46 2020-Aug-24 23:21

Alternate Designations
 1981 EQ40 = 1985 PF1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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