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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1108940049419892 3.0657e-08  
a 3.035476265779061 1.324e-08 au
q 2.698860145760468 9.4952e-08 au
i 11.44963220348151 3.1592e-06 deg
node 135.9003241926053 1.7257e-05 deg
peri 262.9494274790533 2.3268e-05 deg
M 357.1006919852336 1.4335e-05 deg
tp 2459216.057168100800
(2021-Jan-01.55716810)
7.6902e-05 TDB
period 1931.695593487807
5.29
1.2639e-05
3.46e-08
d
yr
n .1863647674165864 1.2193e-09 deg/d
Q 3.372092385797656 1.4709e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2880  
   data-arc span      30282 days (82.91 yr)  
   first obs. used      1938-02-19  
   last obs. used      2021-01-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43114  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:04:54  

Additional Information
 Earth MOID = 1.73508 au 
 Jupiter MOID = 2.08096 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 11.40   n/a E2021B10  
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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