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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05609049764950789 1.6029e-08  
a 3.355841637150339 1.4526e-08 au
q 3.167610809689637 5.212e-08 au
i 22.58480353356082 1.0378e-06 deg
node 186.6990797892352 2.9511e-06 deg
peri 26.40837021047948 1.897e-05 deg
M 333.5547166455991 1.6704e-05 deg
tp 2459365.447728077824
(2021-May-30.94772808)
0.00010413 TDB
period 2245.435653391652
6.15
1.4579e-05
3.992e-08
d
yr
n .160325235531124 1.041e-09 deg/d
Q 3.544072464611041 1.5341e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3267  
   data-arc span      25729 days (70.44 yr)  
   first obs. used      1950-10-13  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .3993  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:46:00  

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 1.60999467844074 1.60999371810678 1.60999563877845 5.82900472341991 5.73803892550409 2442347.666329824 0.863559621834622 140.504261503465 16.6958286174468 -71.152740186227 10208646.6698073 T 46 CATAB v2.0g-lin.ifort 2021-May-03 19:46:53 2021-May-03 19:46
1987-Apr-17 08:06 < 00:01 Jupiter 1.39055077214625 1.39055054488367 1.39055099940938 5.91834506309137 5.81451232518277 2446902.837535446 0.487511875535421 117.875774481582 10.2864907143566 -87.9336945383717 11188418.8462522 T 46 CATAB v2.0g-lin.ifort 2021-May-03 19:46:53 2021-May-03 19:46
1999-Sep-27 07:47 < 00:01 Jupiter 1.50378871915602 1.50378840149337 1.50378903681901 5.87980771451661 5.78321889478538 2451448.824152261 0.28688435784102 59.2581125866009 11.3813471661654 79.1209884125131 11715695.2101253 T 46 CATAB v2.0g-lin.ifort 2021-May-03 19:46:53 2021-May-03 19:46
2012-May-05 12:46 < 00:01 Jupiter 1.93133063147247 1.93133035620494 1.93133090674 5.39594863058603 5.31404956969935 2456053.031708973 0.18370643158919 31.747611080366 12.8539925137782 79.2932791288135 12237148.0311982 T 46 CATAB v2.0g-lin.ifort 2021-May-03 19:46:53 2021-May-03 19:46
2140-Nov-05 04:16 00:02 Jupiter 1.60846040304782 1.60845838297444 1.60846242314012 5.84673109030119 5.75595825310099 2502987.677537020 1.87316498440098 297.713595641315 15.2415509519703 -70.3512934221441 10833368.820796 T 46 CATAB v2.0g-lin.ifort 2021-May-03 19:46:53 2021-May-03 19:46
2153-Apr-28 05:22 00:02 Jupiter 1.39113995788368 1.39113954712806 1.39114036867869 5.91957365347089 5.81580720939633 2507544.723791247 1.77266462418565 423.541087174238 9.50049036290711 -87.5667941640821 11751470.9245521 T 46 CATAB v2.0g-lin.ifort 2021-May-03 19:46:53 2021-May-03 19:46
2165-Oct-07 15:15 00:02 Jupiter 1.51267617767291 1.51267435541331 1.51267799997515 5.86574616577412 5.7694955378804 2512090.135498106 2.1945242440491 417.319929062454 11.4217693055222 77.4647255013463 11577677.6801176 T 46 CATAB v2.0g-lin.ifort 2021-May-03 19:46:53 2021-May-03 19:46
2178-May-14 17:09 00:04 Jupiter 1.92749710782184 1.92749338943815 1.92750082621396 5.34431202843594 5.2614435049255 2516692.214609329 3.50835471770412 275.749061228648 21.1244924138297 46.4155144965889 11532234.6649903 T 46 CATAB v2.0g-lin.ifort 2021-May-03 19:46:53 2021-May-03 19:46

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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