+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21078 (1991 RR16) Classification: Outer Main-belt Asteroid          SPK-ID: 2021078 [ 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 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08861716858422103 4.6559e-08   a 3.394719028350616 2.9274e-08 au q 3.093888639919207 1.6254e-07 au i 8.07788914312632 6.586e-06 deg node 23.47009943366066 3.344e-05 deg peri 282.6449820985056 5.5804e-05 deg M 286.6020472053955 4.9078e-05 deg tp 2459666.285135640814 (2022-Mar-27.78513564) 0.00031434 TDB period 2284.568471547607 6.25 2.9551e-05 8.091e-08 d yr n .1575789933562944 2.0383e-09 deg/d Q 3.695549416782025 3.1868e-08 au   Orbit Determination Parameters    # obs. used (total)      1548      data-arc span      12691 days (34.75 yr)      first obs. used      1985-10-18      last obs. used      2020-07-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .47169      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 01:59:02   Additional Information  Earth MOID = 2.09125 au   Jupiter MOID = 1.58797 au   T_jup = 3.126  [ 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 12.68   n/a E2021B10   diameter diameter 14.807 km 0.167 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.067   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21078 (1991 RR16)          Discovered 1991-Sep-15 by Holt, H. E. at Palomar Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1991 RR16 = 1985 UC6 = 1998 WF20  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-13 05:54 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin