+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   58955 (1998 QG78) Classification: Main-belt Asteroid          SPK-ID: 2058955 [ 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 22 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1278329490237679 3.3781e-08   a 2.259926570635977 9.6064e-09 au q 1.971033492534409 7.5105e-08 au i 6.127657771566387 4.1803e-06 deg node 236.3579288950455 4.2293e-05 deg peri 236.4652502714051 4.6557e-05 deg M 27.66539433615351 1.9227e-05 deg tp 2458905.138234362210 (2020-Feb-25.63823436) 6.6184e-05 TDB period 1240.908956961485 3.40 7.9122e-06 2.166e-08 d yr n .2901099214252618 1.8498e-09 deg/d Q 2.548819648737545 1.0834e-08 au   Orbit Determination Parameters    # obs. used (total)      829      data-arc span      8917 days (24.41 yr)      first obs. used      1995-12-19      last obs. used      2020-05-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51482      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 22:48:50   Additional Information  Earth MOID = .995229 au   Jupiter MOID = 2.57223 au   T_jup = 3.602  [ 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 15.8   n/a MPO452969   diameter diameter 2.007 km 0.502 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.230   0.119 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   58955 (1998 QG78)          Discovered 1998-Aug-24 by LINEAR at Socorro Reference: 20030614/Numbers.arc Last Updated: 2004-04-19 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 2161-Nov-18 08:52 00:03 Thisb 0.034269651241016 0.0342472137985723 0.034292091688943 4.8260116560253 4.82601161479878 2510670.869284095 2.85895327869887 1227.92948498335 53.9878514310344 -24.3898115870806 39379.7951875905 T 22 CATAB v2.0f-lin.ifort 2020-Nov-12 22:48:52 2020-Nov-12 22:48 Alternate Designations  1998 QG78 = 2000 GD178  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-16 08:59 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin