+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   6516 Gruss (1988 TC2) Classification: Main-belt Asteroid          SPK-ID: 2006516 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2005419011818776 4.2645e-08   a 2.337389121811124 8.3765e-09 au q 1.868644663521282 1.0099e-07 au i 1.694455340170662 3.796e-06 deg node 279.8233925912298 0.00015339 deg peri 82.71077420572847 0.00015366 deg M 315.0575524949438 1.2306e-05 deg tp 2459163.448052270675 (2020-Nov-09.94805227) 4.5125e-05 TDB period 1305.253765070173 3.57 7.0164e-06 1.921e-08 d yr n .2758084363622929 1.4826e-09 deg/d Q 2.806133580100966 1.0056e-08 au   Orbit Determination Parameters    # obs. used (total)      1434      data-arc span      14116 days (38.65 yr)      first obs. used      1981-10-24      last obs. used      2020-06-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54563      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 16:32:02   Additional Information  Earth MOID = .866958 au   Jupiter MOID = 2.65623 au   T_jup = 3.539  [ 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 14.6   n/a MPO324368   diameter diameter 6.185 km 1.736 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   rotation period rot_per 13.003 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong. Published Reference List: [Clark, M. (2014) Minor Planet Bull. 41, 178-183.] geometric albedo albedo 0.060   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   6516 Gruss           Discovered 1988 Oct. 3 by A. Mrkos at Klet. Czech astronomer Gustav Gruss (1854-1922) was head of the Astronomical Institute of the Czech division of Charles University in Prague from 1891 to 1914. He studied the spectroscopy of variable stars. The name was suggested by J. Ticha and M. Šolc. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20000523/MPCPages.arc Last Updated: 2013-03-29 [ show close-approach data ] Alternate Designations  1988 TC2 = 1981 UV17 = 1981 WA6  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-15 21:12 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin