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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 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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457097.5 (2015-Mar-16.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1131470393245031 3.1238e-08  
q 2.692862178073308 9.6848e-08 au
tp 2457268.766131487146
(2015-Sep-03.26613149)
7.8774e-05 TDB
node 136.2709231395729 1.7299e-05 deg
peri 260.2282860671996 2.3044e-05 deg
i 11.43938187172161 3.3809e-06 deg
  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
 Jupiter MOID = 2.08139 au 
 T_jup = 3.202 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.75823868285106E-16 -3.002688615116735E-15 -3.757890599619456E-13 -1.059470363357696E-15 -7.312803370851266E-14 -2.384300965807241E-15
q -3.002688615116735E-15 9.379451476687478E-15 9.444444542711272E-13 2.56806289774827E-15 1.825439709006732E-13 7.872423170799887E-15
tp -3.757890599619456E-13 9.444444542711272E-13 6.205277721556831E-9 1.070321182681997E-11 1.214981466553909E-9 2.845690846979675E-12
node -1.059470363357696E-15 2.56806289774827E-15 1.070321182681997E-11 2.992498213836142E-10 -2.911406511342538E-10 1.084769218968717E-11
peri -7.312803370851266E-14 1.825439709006732E-13 1.214981466553909E-9 -2.911406511342538E-10 5.310329582382543E-10 -1.014751205453489E-11
i -2.384300965807241E-15 7.872423170799887E-15 2.845690846979675E-12 1.084769218968717E-11 -1.014751205453489E-11 1.143055214857669E-11

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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