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20244 (1998 EF)
Classification: Main-belt Asteroid          SPK-ID: 2020244
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04992060184948814 4.2718e-08  
a 2.378640326309572 8.6778e-09 au
q 2.259897169636735 1.0408e-07 au
i 10.09665372651361 3.6337e-06 deg
node 125.3258789448974 2.117e-05 deg
peri 84.37786775552888 4.1471e-05 deg
M 42.97998783045608 3.5631e-05 deg
tp 2459040.523798569412
(2020-Jul-10.02379857)
0.00013261 TDB
period 1339.959255972655
3.67
7.3327e-06
2.008e-08
d
yr
n .2686648854398798 1.4702e-09 deg/d
Q 2.497383482982408 9.111e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1578  
   data-arc span      10638 days (29.13 yr)  
   first obs. used      1991-05-08  
   last obs. used      2020-06-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49825  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:15:59  

Additional Information
 Earth MOID = 1.28062 au 
 Jupiter MOID = 2.51027 au 
 T_jup = 3.517 
[ 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 14.63   n/a E2021B10  
diameter diameter 3.210 km 0.111 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.93185 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.327   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20244 (1998 EF)          Discovered 1998-Mar-01 by Kobayashi, T. at Oizumi
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 EF = 1991 JD2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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