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JPL Small-Body Database Browser
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12496 Ekholm (1998 FF9)
Classification: Main-belt Asteroid          SPK-ID: 2012496
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1875640463123981 3.9828e-08  
a 2.442600207210265 9.3008e-09 au
q 1.984456228822405 9.6082e-08 au
i 3.839280114609123 3.3248e-06 deg
node 82.71377657880103 6.8062e-05 deg
peri 231.2768548280153 6.8827e-05 deg
M 199.705257162646 1.1218e-05 deg
tp 2459621.360155892054
4.448e-05 TDB
period 1394.366728220948
n .2581817198545168 1.4746e-09 deg/d
Q 2.900744185598124 1.1045e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1501  
   data-arc span      10381 days (28.42 yr)  
   first obs. used      1991-08-06  
   last obs. used      2020-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53916  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 22:49:34  

Additional Information
 Earth MOID = .973199 au 
 Jupiter MOID = 2.38143 au 
 T_jup = 3.473 
[ 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 14.6   n/a MPO467813  
diameter diameter 3.130 km 0.188 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
geometric albedo albedo 0.344   0.077 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

12496 Ekholm           Discovered 1998 Mar. 22 by Spacewatch at Kitt Peak.
As a promising planetary scientist, Andreas G. Ekholm (1975-2001) contributed to the fields of impact cratering processes, geophysics of icy satellites, and photometry of KBOs and Centaurs. He was also active in humanitarian causes before his premature death in an automobile accident in his native Sweden.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20021120/MPCPages.arcLast Updated: 2003-10-02

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
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
1939-Apr-06 08:22 00:01 Ceres 0.0484017843186562 0.0483918651531425 0.0484117035935218 4.50458759872967 4.50458566107959 2429359.848621588 1.07332349247375 503.70998117506 49.6084847196197 -12.9668425563195 35380.8325125361 T 25 CATAB v2.0f-lin.ifort 2020-Jan-28 22:50:06 2020-Jan-28 22:50

Alternate Designations
 1998 FF9 = 1991 PX13 = 1995 SL4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2020-Feb-19 10:27 UT
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