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1853 McElroy (1957 XE)
Classification: Main-belt Asteroid          SPK-ID: 2001853
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.

Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04591153191875791 2.1327e-08  
a 3.062508741739957 1.3569e-08 au
q 2.921904273892088 6.812e-08 au
i 15.788363695344 4.2502e-07 deg
node 298.6346298212808 3.0111e-06 deg
peri 92.64296849254491 3.6498e-05 deg
M .5570790247408696 3.294e-05 deg
tp 2459393.470794488849
0.00017912 TDB
period 1957.557071048306
n .1839026842814926 1.2223e-09 deg/d
Q 3.203113209587827 1.4192e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3237  
   data-arc span      25916 days (70.95 yr)  
   first obs. used      1950-07-15  
   last obs. used      2021-06-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .33601  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 12:52:17  

Additional Information
 Earth MOID = 1.98016 au 
 Jupiter MOID = 2.05896 au 
 T_jup = 3.174 
[ 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 10.99   n/a E2021B10  
diameter diameter 23.807 km 0.154 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 8.016 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2005) Minor Planet Bull. 32, 4-7.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.197   0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

1853 McElroy           Discovered 1957 Dec. 15 at the Goethe Link Observatory, Indiana University.
Named in honor of William David McElroy, distinguished biologist and biochemist, chairman of the biology department at Johns Hopkins University during 1956-1969, later director of the National Science Foundation (1969-1972) and chancellor of the University of California at San Diego (1972-1980). During his tenure as director of N.S.F. the U.S. government decided to fund the Very Large Array, which will be the pre-eminent instrument for radio astronomy for many years to come.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 5450Last Updated: 2006-03-21

Alternate Designations
 1957 XE = 1930 YP = 1950 NX = 1950 OM 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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