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20540 Marhalpern (1999 RV86)
Classification: Main-belt Asteroid          SPK-ID: 2020540
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06423084997440869 4.9772e-08  
a 2.747276795371994 1.5866e-08 au
q 2.570816871690281 1.4018e-07 au
i 5.601851022564323 5.0783e-06 deg
node 23.93190238748827 4.587e-05 deg
peri 308.5723146813946 5.5267e-05 deg
M 259.9360961093027 3.2345e-05 deg
tp 2459662.803302048105
(2022-Mar-24.30330205)
0.00015002 TDB
period 1663.229019318626
4.55
1.4408e-05
3.945e-08
d
yr
n .2164464399181064 1.875e-09 deg/d
Q 2.923736719053707 1.6885e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1259  
   data-arc span      10828 days (29.65 yr)  
   first obs. used      1990-09-28  
   last obs. used      2020-05-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51934  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:23:32  

Additional Information
 Earth MOID = 1.56355 au 
 Jupiter MOID = 2.3114 au 
 T_jup = 3.337 
[ 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 14.45   n/a E2021B10  
diameter diameter 6.915 km 0.186 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.184 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.077   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20540 Marhalpern           Discovered 1999 Sept. 7 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Marcia Halpern mentored a finalist in the 2004 Discovery Channel Youth Science Challenge (DCYSC), a middle school science competition. She teaches at the Muirlands Middle School, La Jolla, California.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20041028/MPCPages.arcLast Updated: 2004-10-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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