+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   22571 Letianzhang (1998 HA39) Classification: Main-belt Asteroid          SPK-ID: 2022571 [ 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 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1225944620309367 2.96e-08   a 2.238960700236839 5.6561e-09 au q 1.964476517682894 6.5574e-08 au i 4.777074103032868 3.1182e-06 deg node 213.5002033757449 4.2591e-05 deg peri 232.8646595872688 4.5227e-05 deg M 21.1273404659719 1.4727e-05 deg tp 2459128.685777483942 (2020-Oct-06.18577748) 5.0005e-05 TDB period 1223.680763199726 3.35 4.637e-06 1.27e-08 d yr n .2941943771827047 1.1148e-09 deg/d Q 2.513444882790783 6.3496e-09 au   Orbit Determination Parameters    # obs. used (total)      1345      data-arc span      16211 days (44.38 yr)      first obs. used      1976-10-24      last obs. used      2021-03-13      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .51377      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 04:07:42   Additional Information  Earth MOID = .984482 au   Jupiter MOID = 2.67811 au   T_jup = 3.622  [ 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 15.5   n/a MPO337449   diameter diameter 3.086 km 0.665 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   geometric albedo albedo 0.094   0.047 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)   22571 Letianzhang           Discovered 1998 Apr. 20 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Letian Zhang (b. 1988) is a finalist in the 2006 Intel Science Talent Search (STS), a science competition for high school seniors, for his mathematics project. He attends the Illinois Mathematics & Science Academy, Aurora, Illinois. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20060314/MPCPages.arc Last Updated: 2006-03-23 Alternate Designations  1998 HA39 = 1976 UE20  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-22 04:14 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin