+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   17776 Troska (1998 FF3) Classification: Main-belt Asteroid          SPK-ID: 2017776 [ 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 26 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08169072773855143 4.0638e-08   a 2.483785120344812 9.7866e-09 au q 2.280882906317659 1.0476e-07 au i 7.461853430871768 3.9586e-06 deg node 320.5498574010109 2.7365e-05 deg peri 235.4737029223882 3.529e-05 deg M 278.9672078778801 2.5018e-05 deg tp 2459522.330915858664 (2021-Nov-03.83091586) 0.00010016 TDB period 1429.78079213307 3.91 8.4504e-06 2.314e-08 d yr n .251786848711907 1.4881e-09 deg/d Q 2.686687334371965 1.0586e-08 au   Orbit Determination Parameters    # obs. used (total)      1749      data-arc span      9896 days (27.09 yr)      first obs. used      1994-02-08      last obs. used      2021-03-14      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .46662      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 02:12:46   Additional Information  Earth MOID = 1.28955 au   Jupiter MOID = 2.31083 au   T_jup = 3.460  [ 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 14.48   n/a E2021B10   diameter diameter 4.682 km 0.075 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.126   0.016 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   17776 Troska           Discovered 1998 Mar. 22 by P. Pravec at Ondřejov. Jan Matzal, the pseudonym of J. M. Troska (1881-1961), was a great Czech writer of adventure science fiction in the 1930s. His greatest work, the trilogy Zápas s nebem ("Struggle with the Sky") describes a marvelous journey through the whole inner solar system, including visits to and being marooned on minor planets. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20010705/MPCPages.arc Last Updated: 2009-05-11 Alternate Designations  1998 FF3 = 1994 CZ7 = 1995 OQ1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-17 23:56 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin