+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2572356606299741 3.8608e-08   a 2.355591082082523 6.4856e-09 au q 1.749649053908949 9.1507e-08 au i 8.662301546415154 4.764e-06 deg node 321.9927004042082 2.2026e-05 deg peri 31.88594168279091 2.327e-05 deg M 103.1323201630969 8.1165e-06 deg tp 2458822.196319556958 (2019-Dec-04.69631956) 2.9036e-05 TDB period 1320.530021472615 3.62 5.4537e-06 1.493e-08 d yr n .2726178081120328 1.1259e-09 deg/d Q 2.961533110256096 8.1539e-09 au   Orbit Determination Parameters    # obs. used (total)      2166      data-arc span      26758 days (73.26 yr)      first obs. used      1947-10-21      last obs. used      2021-01-23      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44777      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 01:13:57   Additional Information  Earth MOID = .748638 au   Jupiter MOID = 2.49879 au   T_jup = 3.494  [ 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 13.26   n/a E2021B10   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. 2020-October); 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.] [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] 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 ] 2021-Feb-25 08:10 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin