+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21502 Cruz (1998 KB9) Classification: Main-belt Asteroid          SPK-ID: 2021502 [ 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 26 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1226229550661874 2.8013e-08   a 2.60132341836826 9.4476e-09 au q 2.282341453725068 7.0991e-08 au i 3.686361797763569 2.9242e-06 deg node 115.8518976322438 6.4569e-05 deg peri 205.3367172688096 6.6809e-05 deg M 61.59314737860925 1.6885e-05 deg tp 2458938.307750872313 (2020-Mar-29.80775087) 7.1875e-05 TDB period 1532.462842104213 4.20 8.3485e-06 2.286e-08 d yr n .234915973235401 1.2798e-09 deg/d Q 2.920305383011452 1.0606e-08 au   Orbit Determination Parameters    # obs. used (total)      1698      data-arc span      8744 days (23.94 yr)      first obs. used      1997-02-03      last obs. used      2021-01-12      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .45566      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 02:52:55   Additional Information  Earth MOID = 1.26816 au   Jupiter MOID = 2.35676 au   T_jup = 3.401  [ 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 14.53   n/a E2020-QM5   diameter diameter 3.173 km 0.424 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.367   0.106 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21502 Cruz           Discovered 1998 May 24 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station. Jose Cruz (b. 1946), operations group head and telescope operator at the Arecibo Observatory, has played a key role in numerous radar experiments on minor planets since the 1970s. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20080718/MPCPages.arc Last Updated: 2008-07-18 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-13 06:12 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin