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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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2554883668893559 3.769e-08  
a 2.68035780771842 9.8874e-09 au
q 1.995557568745306 1.0519e-07 au
i 3.510450114278241 4.043e-06 deg
node 77.43474694740038 6.2008e-05 deg
peri 206.3859759152649 6.2511e-05 deg
M 38.09662771526765 1.0931e-05 deg
tp 2458830.882124410616
(2019-Dec-13.38212441)
4.8055e-05 TDB
period 1602.830457030372
4.39
8.8688e-06
2.428e-08
d
yr
n .2246026698712641 1.2428e-09 deg/d
Q 3.365158046691533 1.2413e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2848  
   data-arc span      30323 days (83.02 yr)  
   first obs. used      1936-08-09  
   last obs. used      2019-08-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4431  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:53:50  

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. 2019-August); 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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