+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21997 (1999 XP36) Classification: Main-belt Asteroid          SPK-ID: 2021997 [ 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 41 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .178775433796351 1.5581e-08   a 2.580715530448032 7.8192e-09 au q 2.119346991987205 4.0258e-08 au i 10.8113360448935 5.3644e-07 deg node 20.80823613381513 4.6748e-06 deg peri 11.60540980457897 6.6911e-06 deg M 45.33896909253301 5.6551e-06 deg tp 2459009.788109991385 (2020-Jun-09.28810999) 2.3533e-05 TDB period 1514.288519948031 4.15 6.8821e-06 1.884e-08 d yr n .2377354085814206 1.0805e-09 deg/d Q 3.042084068908859 9.2171e-09 au   Orbit Determination Parameters    # obs. used (total)      2149      data-arc span      15498 days (42.43 yr)      first obs. used      1978-10-09      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .44687      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:57:14   Additional Information  Earth MOID = 1.12476 au   Jupiter MOID = 2.41696 au   T_jup = 3.377  [ 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 13.49   n/a E2021B10   diameter diameter 5.994 km 0.264 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.215   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21997 (1999 XP36)          Discovered 1999-Dec-07 by Juels, C. W. at Fountain Hills Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1999 XP36 = 1978 TP = 1990 JD  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-20 12:02 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin