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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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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1108338279590662 3.1183e-08  
a 3.035463439499086 1.6368e-08 au
q 2.699031406869609 9.5221e-08 au
i 11.4495562024871 3.9307e-06 deg
node 135.8997947443969 1.7856e-05 deg
peri 262.8814520090768 2.517e-05 deg
M 319.8805289066348 1.8452e-05 deg
tp 2459215.772539788567
(2021-Jan-01.27253979)
9.9432e-05 TDB
period 1931.683350050452
5.29
1.5624e-05
4.278e-08
d
yr
n .1863659486378021 1.5074e-09 deg/d
Q 3.371895472128563 1.8182e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2327  
   data-arc span      30056 days (82.29 yr)  
   first obs. used      1938-02-19  
   last obs. used      2020-06-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47437  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:48:45  

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

[ show close-approach data ]
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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