+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3879 Machar (1983 QA) Classification: Main-belt Asteroid          SPK-ID: 2003879 [ 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 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .257155606619747 4.169e-08   a 2.355216179833721 6.8576e-09 au q 1.749559134387937 9.9346e-08 au i 8.662059720132209 4.9195e-06 deg node 321.9944558091069 2.4744e-05 deg peri 31.85569450862446 2.5881e-05 deg M 48.64140851432827 8.0174e-06 deg tp 2458822.119148487066 (2019-Dec-04.61914849) 2.9068e-05 TDB period 1320.214782138549 3.61 5.7661e-06 1.579e-08 d yr n .2726829034718534 1.1909e-09 deg/d Q 2.960873225279504 8.6211e-09 au   Orbit Determination Parameters    # obs. used (total)      1905      data-arc span      26404 days (72.29 yr)      first obs. used      1947-10-21      last obs. used      2020-02-04      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46811      source      ORB      producer      Otto Matic      solution date      2020-Feb-22 16:58:22   Additional Information  Earth MOID = .750257 au   Jupiter MOID = 2.49863 au   T_jup = 3.495  [ 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 13.2   n/a MPO448952   diameter diameter 5.712 km 0.139 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 4.131 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Behrend, R. (2012) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Menzies, K. (2012) Posting on CALL web site. http://www.minorplanet.info/call.html] [Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] geometric albedo albedo 0.375   0.060 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   3879 Machar (1983 QA)          Discovered 1983-Aug-16 by Vavrova, Z. at Klet Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1983 QA = 1947 UG = 1976 UJ1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Sep-23 20:16 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin