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1691 Oort (1956 RB)
Classification: Main-belt Asteroid          SPK-ID: 2001691
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1743349382730515 3.7129e-08  
a 3.163566348281662 1.3561e-08 au
q 2.612046204231275 1.1873e-07 au
i 1.085747408703709 3.9054e-06 deg
node 174.5190477277297 0.00021402 deg
peri 232.738991580895 0.00021432 deg
M 170.0917395177875 1.1239e-05 deg
tp 2456629.443343714645
6.1463e-05 JED
period 2055.246170412469
n .1751614989885865 1.1263e-09 deg/d
Q 3.715086492332048 1.5925e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1845  
   data-arc span      25752 days (70.51 yr)  
   first obs. used      1945-10-15  
   last obs. used      2016-04-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53496  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 12:35:32  

Additional Information
 Earth MOID = 1.6205 au 
 Jupiter MOID = 1.67809 au 
 T_jup = 3.180 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.95 mag n/a PDS3 (MPC 17263)  
rotation period rot_per 10.2705 h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Published Reference List:
[Behrend, R. (2009) Observatoire de Geneve web site,]
[Hanus, J.; Broz, M.; Durech, J.; Warner, B.D.; et al. (2013) Astron. Astrophys. 559, A134.]
B-V BV .682 mag .025 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=1; phase=.75 deg.
U-B UB .316 mag .044 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=1; phase=.75 deg.
Tholen spectral type spec_T CU   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

1691 Oort (1956 RB)          Discovered 1956-Sep-09 by Reinmuth, K. and Groeneveld, I. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1956 RB = 1945 TD = 1947 DA = 1950 PZ = 1950 RU = 1951 XW = 1955 MW = 1956 SD = 1964 DA = A917 TD 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2016-May-03 04:57 UT
(server date/time)  
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