+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   16969 Helamuda (1998 UM20) Classification: Outer Main-belt Asteroid          SPK-ID: 2016969 [ 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 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1545418914695174 4.3806e-08   a 3.24682735251787 2.6359e-08 au q 2.745056512184793 1.3601e-07 au i 2.597491320561117 4.7357e-06 deg node 91.11471870167597 0.00010958 deg peri 342.5865364407925 0.00011082 deg M 259.4671248539271 1.9724e-05 deg tp 2459797.250543488301 (2022-Aug-05.75054349) 0.00012053 TDB period 2136.914868331809 5.85 2.6022e-05 7.124e-08 d yr n .168467169813384 2.0515e-09 deg/d Q 3.748598192850947 3.0432e-08 au   Orbit Determination Parameters    # obs. used (total)      1025      data-arc span      15887 days (43.50 yr)      first obs. used      1977-02-18      last obs. used      2020-08-18      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .57132      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 01:49:25   Additional Information  Earth MOID = 1.75967 au   Jupiter MOID = 1.52663 au   T_jup = 3.162  [ 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 13.86   n/a E2021B10   16969 Helamuda           Discovered 1998 Oct. 29 at the Starkenburg Observatory, Heppenheim. Helamuda is an acronym for Hessisches Landesmuseum Darmstadt, the museum of the federal state of Hessen. This unique institution features exquisite collections in both fine arts and natural sciences and conducts paleontological excavations at the nearby Messel site. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20010309/MPCPages.arc Last Updated: 2009-05-11 [ show close-approach data ] Alternate Designations  1998 UM20 = 1977 DA2 = 1998 SK147  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-16 11:03 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin