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20531 Stevebabcock (1999 RW57)
Classification: Main-belt Asteroid          SPK-ID: 2020531
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 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1903388649947502 3.5365e-08  
a 2.381026766023678 8.4815e-09 au
q 1.927824833856611 8.672e-08 au
i 2.93138045589904 3.7116e-06 deg
node 57.15504416112051 6.7817e-05 deg
peri 210.7391155328485 6.8441e-05 deg
M 332.4739397364641 1.0707e-05 deg
tp 2459303.109222939739
(2021-Mar-29.60922294)
4.0183e-05 TDB
period 1341.976291000129
3.67
7.1704e-06
1.963e-08
d
yr
n .2682610731756701 1.4334e-09 deg/d
Q 2.834228698190746 1.0096e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1724  
   data-arc span      8616 days (23.59 yr)  
   first obs. used      1996-11-08  
   last obs. used      2020-06-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47895  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:23:25  

Additional Information
 Earth MOID = .910792 au 
 Jupiter MOID = 2.25782 au 
 T_jup = 3.512 
[ 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 3.638 km 0.069 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 22.6199 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.268   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20531 Stevebabcock           Discovered 1999 Sept. 7 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Steven Babcock mentored a finalist in the 2004 Discovery Channel Youth Science Challenge (DCYSC), a middle school science competition. He teaches at the Beaumont Middle School, Portland, Oregon.
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 ]
Alternate Designations
 1999 RW57 = 1996 WP1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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