+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   18055 Fernhildebrandt (1999 TJ13) Classification: Main-belt Asteroid          SPK-ID: 2018055 [ 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 26 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1224845447576988 4.6405e-08   a 2.694479989052251 1.5277e-08 au q 2.364447834234456 1.2642e-07 au i 11.12906529420516 4.5444e-06 deg node 293.1232752595237 2.3203e-05 deg peri 248.0776043135779 2.8676e-05 deg M 113.2626721597982 1.7403e-05 deg tp 2458692.229184552673 (2019-Jul-27.72918455) 7.7944e-05 TDB period 1615.514538654724 4.42 1.3739e-05 3.762e-08 d yr n .2228392201903552 1.8951e-09 deg/d Q 3.024512143870045 1.7148e-08 au   Orbit Determination Parameters    # obs. used (total)      1630      data-arc span      24652 days (67.49 yr)      first obs. used      1953-03-09      last obs. used      2020-09-05      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .49928      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 02:17:12   Additional Information  Earth MOID = 1.39499 au   Jupiter MOID = 2.08057 au   T_jup = 3.333  [ 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 13.73   n/a E2021B10   diameter diameter 5.390 km 0.122 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.201   0.043 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   18055 Fernhildebrandt           Discovered 1999 Oct. 11 by G. Hug and G. Bell at Farpoint Observatory. Fern C. Hildebrandt (b. 1927) instilled and cultivated an interest in astronomy in codiscoverer Gary Hug at a very early age. Resident now in Topeka, Kansas, she has been an example of dedication and triumph through difficult times and has inspired this codiscoverer to search the night sky. 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  1999 TJ13 = 1953 EG2 = 1988 BT4  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-11 14:50 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin