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1796 Riga (1966 KB)
Classification: Outer Main-belt Asteroid          SPK-ID: 2001796
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ 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 .05609045490527889 3.316e-08  
a 3.355841642934955 1.6157e-08 au
q 3.167610958592655 1.1532e-07 au
i 22.58479911865032 3.7572e-06 deg
node 186.6990723511836 9.5982e-06 deg
peri 26.4083460524566 3.6401e-05 deg
M 333.5547451015655 3.5922e-05 deg
tp 2459365.447551015311
(2021-May-30.94755102)
0.00022415 TDB
period 2245.43565919749
6.15
1.6216e-05
4.44e-08
d
yr
n .1603252351165843 1.1578e-09 deg/d
Q 3.544072327277256 1.7063e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3137  
   data-arc span      25665 days (70.27 yr)  
   first obs. used      1950-10-13  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40388  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:58:12  

Additional Information
 Earth MOID = 2.17515 au 
 Jupiter MOID = 1.4246 au 
 T_jup = 3.031 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456468.5 (2013-Jun-25.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05708590202717672 3.3299e-08  
q 3.168023839399358 1.1573e-07 au
tp 2457100.994946798047
(2015-Mar-19.49494680)
0.00021844 TDB
node 186.8179898959985 9.6022e-06 deg
peri 23.24691734261439 3.56e-05 deg
i 22.56646640392625 3.7563e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3137  
   data-arc span      25665 days (70.27 yr)  
   first obs. used      1950-10-13  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40388  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:58:12  

Additional Information
 Jupiter MOID = 1.4246 au 
 T_jup = 3.031 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.10879866683116E-15 -3.821590888712307E-15 -5.750694298631132E-13 -7.56073658835389E-15 -5.246653235464432E-14 1.38079682202215E-15
q -3.821590888712307E-15 1.339290995406793E-14 2.043311843199921E-12 2.644776111730205E-14 1.751138425230615E-13 -6.205845600273009E-15
tp -5.750694298631132E-13 2.043311843199921E-12 4.771494736629126E-8 1.566205974839395E-11 7.50433007357441E-9 4.02196305080025E-12
node -7.56073658835389E-15 2.644776111730205E-14 1.566205974839395E-11 9.220254958127408E-11 -8.249271096197192E-11 -2.258068364741886E-12
peri -5.246653235464432E-14 1.751138425230615E-13 7.50433007357441E-9 -8.249271096197192E-11 1.26738274050877E-9 2.885335602789524E-12
i 1.38079682202215E-15 -6.205845600273009E-15 4.02196305080025E-12 -2.258068364741886E-12 2.885335602789524E-12 1.411003709080791E-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 9.92   n/a E2021B10 IRAS observations used: 12
diameter diameter 68.167 km 0.298 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 22.226 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Oey, J. (2016) Minor Planet Bull. 43, 45-51.]
geometric albedo albedo 0.044   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.676   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=21.31 deg.
U-B UB 0.289   0.040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=21.31 deg.
Tholen spectral type spec_T XFCU   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
SMASSII spectral type spec_B Cb   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

1796 Riga (1966 KB)          Discovered 1966-May-16 by Chernykh, N. at Nauchnyj
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1966 KB = 1935 GE = 1941 FC1 = 1947 GA = 1950 TF2 = 1953 GW = 1960 JA = A907 TG = A907 UD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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