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4908 Ward (1933 SD)
Classification: Main-belt Asteroid          SPK-ID: 2004908
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 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2336614034999565 1.7388e-08  
a 2.189102793882475 4.4185e-09 au
q 1.677593962658219 3.8538e-08 au
i 4.572001907805491 6.4092e-07 deg
node 190.1443955642264 3.5412e-06 deg
peri 165.9285547364057 4.1382e-06 deg
M 339.2627123699691 3.255e-06 deg
tp 2459268.647057832798
(2021-Feb-23.14705783)
1.0847e-05 TDB
period 1183.035180757172
3.24
3.5818e-06
9.806e-09
d
yr
n .3043020240273759 9.2131e-10 deg/d
Q 2.700611625106729 5.4509e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2642  
   data-arc span      31797 days (87.06 yr)  
   first obs. used      1933-09-17  
   last obs. used      2020-10-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46137  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 16:55:51  

Additional Information
 Earth MOID = .672166 au 
 Jupiter MOID = 2.75127 au 
 T_jup = 3.634 
[ 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 13.77   n/a E2021B10  
diameter diameter 4.903 km 0.161 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 10.96 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:
[Chiorny, V.G.; Shevchenko, V.G.; Krugly, Yu.N.; Velichko, F.P.; Gaftonyuk, N.M. (2003) Abstracts of Photometry and Polarimetry of Asteroids: Impact on Collaboration, Kharkiv, 9-10.]
geometric albedo albedo 0.327   0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4908 Ward (1933 SD)          Discovered 1933-Sep-17 by Rigaux, F. at Uccle
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1933 SD = 1972 TK2 = 1978 NC4 = 1988 PU1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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