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1397 Umtata (1936 PG)
Classification: Main-belt Asteroid          SPK-ID: 2001397
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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2554883812672447 2.9005e-08  
a 2.680357803968017 7.7541e-09 au
q 1.995557527415201 7.9326e-08 au
i 3.510448614515929 3.7257e-06 deg
node 77.43473866851099 6.0976e-05 deg
peri 206.3859829644861 6.1484e-05 deg
M 38.09663108349613 9.6165e-06 deg
tp 2458830.882109770227
(2019-Dec-13.38210977)
4.2429e-05 TDB
period 1602.83045366631
4.39
6.9554e-06
1.904e-08
d
yr
n .224602670342666 9.7465e-10 deg/d
Q 3.365158080520832 9.7352e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3214  
   data-arc span      30780 days (84.27 yr)  
   first obs. used      1936-08-09  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42186  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:00:18  

Additional Information
 Earth MOID = .979853 au 
 Jupiter MOID = 1.80698 au 
 T_jup = 3.326 
[ 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 11.4   n/a MPO473782  
diameter diameter 20.798 km 0.292 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 30. h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Binzel, R.P. (1987) Icarus 72, 135-208.]
geometric albedo albedo 0.084   0.046 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.690   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=11.98 deg.
U-B UB 0.210   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=11.98 deg.

1397 Umtata (1936 PG)          Discovered 1936-Aug-09 by Jackson, C. at Johannesburg (UO)
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1936 PG = 1931 GK = 1945 QF = 1945 RC = 1948 EB1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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