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5771 Somerville (1987 ST1)
Classification: Main-belt Asteroid          SPK-ID: 2005771
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2162742610048373 9.8191e-09  
a 3.138922562414423 1.3127e-08 au
q 2.460054404876833 3.2617e-08 au
i 8.267306062553695 4.9747e-07 deg
node 287.9115748834553 3.7268e-06 deg
peri 103.0979857763857 7.4711e-06 deg
M 20.93518506824747 4.9725e-06 deg
tp 2459278.374507250468
(2021-Mar-04.87450725)
2.7934e-05 TDB
period 2031.277834478266
5.56
1.2742e-05
3.489e-08
d
yr
n .1772283406481743 1.1118e-09 deg/d
Q 3.817790719952012 1.5966e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2417  
   data-arc span      13935 days (38.15 yr)  
   first obs. used      1982-12-19  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45091  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 17:56:29  

Additional Information
 Earth MOID = 1.48168 au 
 Jupiter MOID = 1.76121 au 
 T_jup = 3.159 
[ 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 12.40   n/a E2021B10  
diameter diameter 28.306 km 0.264 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 9.20 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:
[Warner, B.D. (2012) Minor Planet Bull. 39, 158-167.]
geometric albedo albedo 0.029   0.001 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

5771 Somerville (1987 ST1)          Discovered 1987-Sep-21 by Bowell, E. at Flagstaff
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1987 ST1 = 1982 YY1 = 1989 BG1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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