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JPL Small-Body Database Browser
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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1108338280665895 3.1202e-08  
a 3.035463439717962 1.6394e-08 au
q 2.699031406737843 9.5253e-08 au
i 11.44955630420674 3.9321e-06 deg
node 135.8997945720991 1.7868e-05 deg
peri 262.8814523961285 2.5188e-05 deg
M 319.8805286143467 1.8479e-05 deg
tp 2459215.772541380206
(2021-Jan-01.27254138)		 9.9583e-05 TDB
period 1931.683350259382
5.29		 1.5649e-05
4.284e-08		 d
yr
n .1863659486176449 1.5098e-09 deg/d
Q 3.371895472698081 1.8211e-08 au
   Orbit Determination Parameters
   # obs. used (total)      2314  
   data-arc span      29853 days (81.73 yr)  
   first obs. used      1938-02-19  
   last obs. used      2019-11-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47486  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:28:34  

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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