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2978 Roudebush (1978 SR)
Classification: Main-belt Asteroid          SPK-ID: 2002978
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1892842574973593 3.7105e-08  
a 3.091868846373644 1.4398e-08 au
q 2.506626747508592 1.188e-07 au
i 1.234283718962006 3.9565e-06 deg
node 348.3233852938361 0.00014819 deg
peri 5.00862255289784 0.00014844 deg
M 231.2252835278014 1.0657e-05 deg
tp 2459710.826673982497
(2022-May-11.32667398)
6.1595e-05 TDB
period 1985.774922586657
5.44
1.3871e-05
3.798e-08
d
yr
n .1812894280742887 1.2663e-09 deg/d
Q 3.677110945238696 1.7123e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2804  
   data-arc span      33179 days (90.84 yr)  
   first obs. used      1929-10-01  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46579  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:58:46  

Additional Information
 Earth MOID = 1.50151 au 
 Jupiter MOID = 1.76396 au 
 T_jup = 3.196 
[ 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 12.2   n/a MPO384778  
diameter diameter 18.858 km 0.479 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 62.354 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 0.072   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

2978 Roudebush (1978 SR)          Discovered 1978-Sep-26 by Harvard College at Agassiz Station
Discovered at Oak Ridge Observatory (until 1981 Harvard College's Agassiz Station). The principal observers are R. E. McCrosky, C.-Y. Shao, G. Schwartz, and J. H. Bulger, with some assistance from others.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1978 SR = 1929 TC1 = 1934 PN = 1940 SE = 1967 RC1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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