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JPL Small-Body Database Browser
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1928 Summa (1938 SO)
Classification: Main-belt Asteroid          SPK-ID: 2001928
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2027241983597539 4.2406e-08  
a 2.477037956893648 8.2421e-09 au
q 1.974882422775701 1.0515e-07 au
i 4.574650732892403 4.2772e-06 deg
node 180.3671005311616 3.897e-05 deg
peri 157.5626545295216 3.9671e-05 deg
M 351.1628820867081 8.1105e-06 deg
tp 2459035.454699122558
(2020-Jul-04.95469912)
3.216e-05 TDB
period 1423.958784706678
3.90
7.1071e-06
1.946e-08
d
yr
n .2528163061082955 1.2618e-09 deg/d
Q 2.979193491011595 9.913e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2411  
   data-arc span      29548 days (80.90 yr)  
   first obs. used      1938-09-23  
   last obs. used      2019-08-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-23 19:21:14  

Additional Information
 Earth MOID = .966872 au 
 Jupiter MOID = 2.42176 au 
 T_jup = 3.448 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.9   n/a MPO473790  
diameter diameter 9.333 km 0.170 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 6.8549 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Hills, K. (2013) Minor Planet Bull. 40, 12-13.]
[Owings, L. (2013) Minor Planet Bull. 40, 104-106.]
geometric albedo albedo 0.160   0.043 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
B-V BV 1.010   0.040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=2.02 deg.

1928 Summa           Discovered 1938 Sept. 21 by Y. Vaisala at Turku.
Named for a village on the Karelian isthmus, scene of violent battles during the Finnish winter war.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 5450Last Updated: 2006-03-21

Alternate Designations
 1938 SO = 1969 PA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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