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2690 Ristiina (1938 DG1)
Classification: Main-belt Asteroid          SPK-ID: 2002690
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 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .110833815572581 3.0707e-08  
a 3.035463430405114 1.3662e-08 au
q 2.69903143638228 9.4998e-08 au
i 11.44955276983602 3.3798e-06 deg
node 135.8998067377554 1.7276e-05 deg
peri 262.8814305161887 2.3472e-05 deg
M 319.8805413196847 1.491e-05 deg
tp 2459215.772472215379
(2021-Jan-01.27247222)
7.9822e-05 TDB
period 1931.683341369731
5.29
1.3041e-05
3.57e-08
d
yr
n .1863659494753052 1.2582e-09 deg/d
Q 3.371895424427949 1.5176e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2697  
   data-arc span      30200 days (82.68 yr)  
   first obs. used      1938-02-19  
   last obs. used      2020-10-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4431  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:06:58  

Additional Information
 Earth MOID = 1.73628 au 
 Jupiter MOID = 2.08139 au 
 T_jup = 3.202 
[ 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 11.3   n/a MPO431526  
diameter diameter 18.210 km 0.309 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.176   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

2690 Ristiina (1938 DG1)          Discovered 1938-Feb-24 by Vaisala, Y. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1938 DG1 = 1935 QT = 1975 EM = 1977 PW = 1980 DK2 = 1980 EW 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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