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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1108708573601289 3.1342e-08  
a 3.039568521898587 1.6949e-08 au
q 2.702568953870831 9.5358e-08 au
i 11.4390721461509 3.9315e-06 deg
node 135.9224512049375 1.7917e-05 deg
peri 262.1583583253544 2.5168e-05 deg
M 246.107586554159 1.8278e-05 deg
tp 2459212.862559334134
(2020-Dec-29.36255933)
9.9468e-05 TDB
period 1935.603212632932
5.30
1.619e-05
4.433e-08
d
yr
n .1859885319730922 1.5556e-09 deg/d
Q 3.376568089926343 1.8828e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2297  
   data-arc span      29839 days (81.69 yr)  
   first obs. used      1938-02-19  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47442  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 02:18:39  

Additional Information
 Earth MOID = 1.73876 au 
 Jupiter MOID = 2.08228 au 
 T_jup = 3.201 
[ 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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