+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   16895 (1998 DQ9) Classification: Main-belt Asteroid          SPK-ID: 2016895 [ 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 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07506809237634283 3.6955e-08   a 3.018522644867671 1.7252e-08 au q 2.791927908122662 1.0677e-07 au i 11.1122084322845 4.249e-06 deg node 72.95030514308243 2.6978e-05 deg peri 22.65421753745317 4.7643e-05 deg M 196.6480292119808 3.9321e-05 deg tp 2460069.684477860593 (2023-May-05.18447786) 0.00021186 TDB period 1915.534967348941 5.24 1.6422e-05 4.496e-08 d yr n .1879370547321473 1.6112e-09 deg/d Q 3.24511738161268 1.8547e-08 au   Orbit Determination Parameters    # obs. used (total)      1847      data-arc span      10485 days (28.71 yr)      first obs. used      1991-12-30      last obs. used      2020-09-13      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .43894      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 01:45:49   Additional Information  Earth MOID = 1.81155 au   Jupiter MOID = 1.9754 au   T_jup = 3.214  [ 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 12.61   n/a E2021B10   diameter diameter 10.158 km 0.168 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.188   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   16895 (1998 DQ9)          Discovered 1998-Feb-22 by JPL/GEODSS NEAT at Haleakala Reference: 20000913/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1998 DQ9 = 1980 XD = 1991 YK = 1996 XY32  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-15 06:32 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin