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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 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05609049780684183 1.6041e-08  
a 3.355841637401471 1.4583e-08 au
q 3.167610809398695 5.2127e-08 au
i 22.58480353432807 1.0379e-06 deg
node 186.6990797927683 2.9527e-06 deg
peri 26.40837018792413 1.8971e-05 deg
M 333.5547166090803 1.6704e-05 deg
tp 2459365.447728324118
(2021-May-30.94772832)
0.00010414 TDB
period 2245.435653643704
6.15
1.4636e-05
4.007e-08
d
yr
n .1603252355131274 1.045e-09 deg/d
Q 3.544072465404246 1.5401e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3241  
   data-arc span      25721 days (70.42 yr)  
   first obs. used      1950-10-13  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40075  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:57:17  

Additional Information
 Earth MOID = 2.17515 au 
 Jupiter MOID = 1.4246 au 
 T_jup = 3.031 
[ 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 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1974-Oct-27 04:00 < 00:01 Jupiter 1.60999468426388 1.60999372138719 1.60999564714432 5.82900472546899 5.73803892791727 2442347.666326712 0.866374548688829 141.015177586734 16.7002841891159 -71.1661898740506 10205789.532222 T 45 CATAB v2.0f-lin.ifort 2021-Apr-12 12:58:05 2021-Apr-12 12:58
1987-Apr-17 08:06 < 00:01 Jupiter 1.39055077216388 1.39055054489585 1.39055099943246 5.91834506310353 5.81451232519648 2446902.837534202 0.489065267955353 118.253802421704 10.2941185019462 -87.9490993163685 11181421.109913 T 45 CATAB v2.0f-lin.ifort 2021-Apr-12 12:58:05 2021-Apr-12 12:58
1999-Sep-27 07:47 < 00:01 Jupiter 1.50378871674063 1.50378839792425 1.50378903555743 5.87980771204656 5.78321889211765 2451448.824151313 0.28772465458574 59.351481393364 11.4049958510076 79.0797735690101 11699104.8054335 T 45 CATAB v2.0f-lin.ifort 2021-Apr-12 12:58:05 2021-Apr-12 12:58
2012-May-05 12:46 < 00:01 Jupiter 1.93133063068771 1.93133035529064 1.93133090608479 5.39594871228169 5.31404965262055 2456053.031702049 0.183766965500473 31.7683971632485 12.8701896073019 79.3426093689047 12234349.6059916 T 45 CATAB v2.0f-lin.ifort 2021-Apr-12 12:58:05 2021-Apr-12 12:58
2140-Nov-05 04:16 00:02 Jupiter 1.60846039081142 1.60845836256436 1.60846241907758 5.84673113027939 5.75595829301365 2502987.677549985 1.88075976519761 298.916313757561 15.241921510301 -70.349467736569 10832760.8702064 T 45 CATAB v2.0f-lin.ifort 2021-Apr-12 12:58:05 2021-Apr-12 12:58
2153-Apr-28 05:22 00:02 Jupiter 1.39113995525611 1.3911395430801 1.3911403674719 5.91957365499712 5.81580721075204 2507544.723789532 1.77981722654213 425.257500683094 9.50080538001409 -87.5658643534806 11750762.6289213 T 45 CATAB v2.0f-lin.ifort 2021-Apr-12 12:58:05 2021-Apr-12 12:58
2165-Oct-07 15:15 00:02 Jupiter 1.51267618891743 1.51267435958679 1.51267801829115 5.8657461578519 5.76949553054747 2512090.135507932 2.20329840816898 419.012536953438 11.422368021304 77.4661592168761 11576901.2547421 T 45 CATAB v2.0f-lin.ifort 2021-Apr-12 12:58:05 2021-Apr-12 12:58
2178-May-14 17:09 00:04 Jupiter 1.9274971326534 1.92749339955139 1.92750086576395 5.3443120923264 5.26144357089823 2516692.214615877 3.52232825699922 276.868381001894 21.1257838493042 46.4195053019767 11530916.8386608 T 45 CATAB v2.0f-lin.ifort 2021-Apr-12 12:58:05 2021-Apr-12 12:58

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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