+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   19179 (1991 RK8) Classification: Main-belt Asteroid          SPK-ID: 2019179 [ 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 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08058813070521174 1.813e-08   a 2.695740323619451 1.207e-08 au q 2.478495650072297 5.2966e-08 au i 10.33114700384461 1.1175e-06 deg node 40.97306505455213 7.0794e-06 deg peri 248.1603156070789 1.7552e-05 deg M 288.362100276101 1.8488e-05 deg tp 2459522.203549959671 (2021-Nov-03.70354996) 8.3567e-05 TDB period 1616.648148980354 4.43 1.0857e-05 2.972e-08 d yr n .2226829630350041 1.4955e-09 deg/d Q 2.912984997166605 1.3042e-08 au   Orbit Determination Parameters    # obs. used (total)      1987      data-arc span      14540 days (39.81 yr)      first obs. used      1981-05-08      last obs. used      2021-02-27      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .48126      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 02:48:01   Additional Information  Earth MOID = 1.48281 au   Jupiter MOID = 2.21167 au   T_jup = 3.342  [ 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 13.48   n/a E2021B10   diameter diameter 5.977 km 0.254 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.259   0.066 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   19179 (1991 RK8)          Discovered 1991-Sep-12 by Holt, H. E. at Palomar Reference: 20001211/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1991 RK8 = 1981 JB6 = 2000 SS119  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-18 18:57 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin