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5051 Ralph (1984 SM)
Classification: Main-belt Asteroid          SPK-ID: 2005051
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 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1429245306079909 3.0356e-08  
a 2.294153520100112 7.5578e-09 au
q 1.966262705097133 6.9606e-08 au
i 5.872973981308156 3.782e-06 deg
node 269.9015615902149 3.2717e-05 deg
peri 48.76868397322529 3.5469e-05 deg
M 129.6532154997812 1.2895e-05 deg
tp 2458543.398198248398
(2019-Feb-28.89819825)
4.5196e-05 TDB
period 1269.206074035662
3.47
6.2719e-06
1.717e-08
d
yr
n .2836418824055241 1.4016e-09 deg/d
Q 2.62204433510309 8.638e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2118  
   data-arc span      26022 days (71.24 yr)  
   first obs. used      1949-07-25  
   last obs. used      2020-10-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4677  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:46:35  

Additional Information
 Earth MOID = .958558 au 
 Jupiter MOID = 2.6486 au 
 T_jup = 3.576 
[ 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 13.5   n/a MPO502201  
diameter diameter 4.591 km 0.247 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.401   0.072 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
SMASSII spectral type spec_B Sr   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

5051 Ralph           Discovered 1984 Sept. 24 by P. Jensen at Brorfelde.
Ralph Florentin Nielsen (1942-1995) was head of the electronics laboratory at the Brorfelde Observatory.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20000124/MPCPages.arcLast Updated: 2013-03-29

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Alternate Designations
 1984 SM = 1949 OH1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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