+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21152 (1993 MB1) Classification: Main-belt Asteroid          SPK-ID: 2021152 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 42 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1434910934938996 1.7528e-08   a 2.568859302657261 1.0366e-08 au q 2.200250872286994 4.6489e-08 au i 13.5786930401033 5.7058e-07 deg node 131.5103721023584 5.5754e-06 deg peri 120.945767580599 9.4205e-06 deg M 252.574232651753 8.9912e-06 deg tp 2459649.260753271650 (2022-Mar-10.76075327) 3.9073e-05 TDB period 1503.865182122251 4.12 9.1029e-06 2.492e-08 d yr n .2393831603255611 1.449e-09 deg/d Q 2.937467733027527 1.1854e-08 au   Orbit Determination Parameters    # obs. used (total)      2350      data-arc span      24097 days (65.97 yr)      first obs. used      1955-03-25      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .43175      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:40:35   Additional Information  Earth MOID = 1.21652 au   Jupiter MOID = 2.24968 au   T_jup = 3.377  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.20   n/a E2021B10   diameter diameter 6.258 km 0.144 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.411   0.050 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21152 (1993 MB1)          Discovered 1993-Jun-17 by Holt, H. E. at Palomar Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1993 MB1 = 2000 BZ5  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-22 11:38 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin