+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   16946 Farnham (1998 HJ51) Classification: Main-belt Asteroid          SPK-ID: 2016946 [ 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 33 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1441528581241175 1.7889e-08   a 2.384321747976818 7.2827e-09 au q 2.040614953318467 4.2486e-08 au i 6.590151908086437 7.6217e-07 deg node 103.2178733865201 3.6371e-06 deg peri 252.3680198084157 6.4327e-06 deg M 286.9138109562097 7.6502e-06 deg tp 2459473.509986300489 (2021-Sep-16.00998630) 2.9347e-05 TDB period 1344.76289370196 3.68 6.1612e-06 1.687e-08 d yr n .2677051855654391 1.2265e-09 deg/d Q 2.728028542635168 8.3325e-09 au   Orbit Determination Parameters    # obs. used (total)      2206      data-arc span      23645 days (64.74 yr)      first obs. used      1955-11-16      last obs. used      2020-08-11      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .46528      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 01:47:50   Additional Information  Earth MOID = 1.04539 au   Jupiter MOID = 2.71245 au   T_jup = 3.513  [ 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 14.12   n/a E2021B10   diameter diameter 3.429 km 0.121 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.414   0.086 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   16946 Farnham           Discovered 1998 Apr. 25 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station. Tony L. Farnham (b. 1964), an astronomer at the University of Maryland, has studied the dynamics of cometary dust and determined comet rotation states. He has also contributed to the Deep Impact mission by improving the standardization of filter photometry. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20050721/MPCPages.arc Last Updated: 2005-07-21 [ show close-approach data ] Alternate Designations  1998 HJ51 = 1999 RE43  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-16 07:04 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin