+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   19338 (1997 AB2) Classification: Main-belt Asteroid          SPK-ID: 2019338 [ 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 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .01488674762141311 3.8119e-08   a 2.565653446433587 1.2227e-08 au q 2.527459211092522 9.5983e-08 au i 15.50153867437427 3.9339e-06 deg node 104.358889209572 1.3673e-05 deg peri 119.8806516360991 0.00014545 deg M 191.0572269069742 0.00014755 deg tp 2459904.921391177582 (2022-Nov-21.42139118) 0.0006176 TDB period 1501.0508954076 4.11 1.073e-05 2.938e-08 d yr n .2398319744529678 1.7144e-09 deg/d Q 2.603847681774653 1.2409e-08 au   Orbit Determination Parameters    # obs. used (total)      1616      data-arc span      10245 days (28.05 yr)      first obs. used      1993-01-28      last obs. used      2021-02-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .45119      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 02:52:07   Additional Information  Earth MOID = 1.52436 au   Jupiter MOID = 2.50476 au   T_jup = 3.381  [ 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 14.2   n/a MPO347674   diameter diameter 5.564 km 0.135 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.157   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   19338 (1997 AB2)          Discovered 1997-Jan-03 by Kobayashi, T. at Oizumi Reference: 20001211/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1997 AB2 = 1978 NP6  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-17 23:31 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin