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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2554883680726088 3.7539e-08  
a 2.68035780735237 9.8452e-09 au
q 1.995557565301237 1.0474e-07 au
i 3.510450145101887 4.0391e-06 deg
node 77.43474619813581 6.2005e-05 deg
peri 206.3859764264035 6.2507e-05 deg
M 38.09662815580898 1.0892e-05 deg
tp 2458830.882122483937
(2019-Dec-13.38212248)
4.7882e-05 TDB
period 1602.83045670203
4.39
8.831e-06
2.418e-08
d
yr
n .2246026699172742 1.2375e-09 deg/d
Q 3.365158049403503 1.236e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2860  
   data-arc span      30613 days (83.81 yr)  
   first obs. used      1936-08-09  
   last obs. used      2020-06-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44274  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:30:40  

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

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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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