+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   17988 Joannehsieh (1999 JR62) Classification: Main-belt Asteroid          SPK-ID: 2017988 [ 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 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07261768849588578 3.4688e-08   a 2.378836228004928 8.0537e-09 au q 2.206090639816938 8.3282e-08 au i 6.015137586897509 4.1143e-06 deg node 180.9350725589855 3.3802e-05 deg peri 46.78833542760238 4.3086e-05 deg M 330.6562474528521 2.7058e-05 deg tp 2459309.734139932936 (2021-Apr-05.23413993) 0.00010086 TDB period 1340.124795309416 3.67 6.8057e-06 1.863e-08 d yr n .2686316985254205 1.3642e-09 deg/d Q 2.551581816192917 8.6386e-09 au   Orbit Determination Parameters    # obs. used (total)      1764      data-arc span      11478 days (31.43 yr)      first obs. used      1989-10-03      last obs. used      2021-03-07      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .51343      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 02:19:10   Additional Information  Earth MOID = 1.20078 au   Jupiter MOID = 2.423 au   T_jup = 3.529  [ 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 14.58   n/a E2021B10   diameter diameter 2.429 km 0.811 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.520   0.265 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   17988 Joannehsieh           Discovered 1999 May 10 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Joanne Charlotte Hsieh (b. 1985) was awarded first place in the 2003 Intel International Science and Engineering Fair for her biochemistry team project. She attends the Northport High School, Northport, New York, U.S.A. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20040614/MPCPages.arc Last Updated: 2009-12-11 [ show close-approach data ] Alternate Designations  1999 JR62 = 1989 TB13  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-18 09:57 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin