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20246 Frappa (1998 ER6)
Classification: Main-belt Asteroid          SPK-ID: 2020246
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08271590197731357 5.3815e-08  
a 2.296066679793784 8.3593e-09 au
q 2.106145453374586 1.2362e-07 au
i 4.079419889903964 5.2612e-06 deg
node 336.6608704423408 5.786e-05 deg
peri 202.1753020765142 6.1495e-05 deg
M 131.5605547014715 2.0888e-05 deg
tp 2458536.093417987306
(2019-Feb-21.59341799)
7.3829e-05 TDB
period 1270.794045403185
3.48
6.9398e-06
1.9e-08
d
yr
n .2832874463822207 1.547e-09 deg/d
Q 2.485987906212983 9.0507e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1275  
   data-arc span      24106 days (66.00 yr)  
   first obs. used      1953-05-11  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5155  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 02:50:51  

Additional Information
 Earth MOID = 1.11039 au 
 Jupiter MOID = 2.47985 au 
 T_jup = 3.587 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.0   n/a MPO337429  
diameter diameter 2.408 km 0.984 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 9.304 h n/a LCDB (Rev. 2019-August); 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 0.231   0.133 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20246 Frappa           Discovered 1998 Mar. 1 by the OCA-DLR Asteroid Survey at Caussols.
Eric Frappa (b. 1969) is a specialist in the occultation of stars by minor planets. He is responsible for the Euraster web site, which collects occultation data for Europe. He spends several observing missions every year at the Pic du Midi. He works at the planetarium in Saint-Etienne, where he creates digital planetarium shows.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20051215/MPCPages.arcLast Updated: 2006-03-22

Alternate Designations
 1998 ER6 = 1977 DN = 1991 EJ2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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