+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   100040 (1991 RQ17) Classification: Main-belt Asteroid          SPK-ID: 2100040 [ 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 .3689335822814845 3.8899e-08   a 3.167203241544167 1.5853e-08 au q 1.998715603827748 1.1963e-07 au i 22.58148457035929 4.3371e-06 deg node 349.5040004075807 1.2159e-05 deg peri 75.43542745165988 1.518e-05 deg M 19.53883682439246 5.5478e-06 deg tp 2459088.760034761943 (2020-Aug-27.26003476) 3.153e-05 TDB period 2058.791311235142 5.64 1.5458e-05 4.232e-08 d yr n .1748598792094296 1.3129e-09 deg/d Q 4.335690879260587 2.1702e-08 au   Orbit Determination Parameters    # obs. used (total)      1102      data-arc span      10728 days (29.37 yr)      first obs. used      1991-09-11      last obs. used      2021-01-24      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42336      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 08:24:09   Additional Information  Earth MOID = 1.13292 au   Jupiter MOID = 1.98501 au   T_jup = 2.982  [ 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 14.02   n/a E2021B55   diameter diameter 9.388 km 0.157 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.066   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   100040 (1991 RQ17)          Discovered 1991-Sep-11 by Holt, H. E. at Palomar Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  1991 RQ17 = 2003 XK10  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-03 03:48 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin