+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3884 Alferov (1977 EM1) Classification: Main-belt Asteroid          SPK-ID: 2003884 [ 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 33 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1379663533009687 3.9127e-08   a 3.112707778952621 1.663e-08 au q 2.68325883779897 1.2463e-07 au i 1.160892310595705 4.2165e-06 deg node 9.486155547956599 0.00020418 deg peri 112.9641231681138 0.00020478 deg M 357.8908822176318 1.4834e-05 deg tp 2459012.251797137913 (2020-Jun-11.75179714) 8.2673e-05 TDB period 2005.88464286644 5.49 1.6075e-05 4.401e-08 d yr n .1794719358764093 1.4382e-09 deg/d Q 3.542156720106271 1.8924e-08 au   Orbit Determination Parameters    # obs. used (total)      2091      data-arc span      18625 days (50.99 yr)      first obs. used      1969-11-05      last obs. used      2020-11-02      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .49559      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:14:42   Additional Information  Earth MOID = 1.69927 au   Jupiter MOID = 1.52973 au   T_jup = 3.203  [ 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 13.1   n/a MPO324342   diameter diameter 13.386 km 0.076 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.059   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   3884 Alferov (1977 EM1)          Discovered 1977-Mar-13 by Chernykh, N. at Nauchnyj Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1977 EM1 = 1969 VL3 = 1971 DY = 1979 QD4 = 1980 TJ12  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-17 22:02 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin