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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1108939470397695 9.7838e-09  
a 3.035476267034677 1.2519e-08 au
q 2.698860322637656 3.0948e-08 au
i 11.44963535079322 5.4606e-07 deg
node 135.9003260523772 3.1039e-06 deg
peri 262.949427408509 9.7753e-06 deg
M 357.1006889944258 8.775e-06 deg
tp 2459216.057184158593
(2021-Jan-01.55718416)		 4.708e-05 TDB
period 1931.695594686367
5.29		 1.1951e-05
3.272e-08		 d
yr
n .1863647673009526 1.153e-09 deg/d
Q 3.372092211431698 1.3908e-08 au
   Orbit Determination Parameters
   # obs. used (total)      2970  
   data-arc span      30345 days (83.08 yr)  
   first obs. used      1938-02-19  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42747  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 20:26:20  

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 ]

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

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 ]
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