+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2691 Sersic (1974 KB) Classification: Main-belt Asteroid          SPK-ID: 2002691 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .11222384646725 2.8616e-08   a 2.244789088008946 6.5924e-09 au q 1.992870222044872 6.364e-08 au i 3.593635809014914 3.5123e-06 deg node 319.8357479594012 5.0808e-05 deg peri 277.1221428944003 5.3854e-05 deg M 245.7965268402657 1.9718e-05 deg tp 2459390.207309664367 (2021-Jun-24.70730966) 6.7818e-05 TDB period 1228.462038829105 3.36 5.4115e-06 1.482e-08 d yr n .2930493483894139 1.2909e-09 deg/d Q 2.49670795397302 7.3322e-09 au   Orbit Determination Parameters    # obs. used (total)      2801      data-arc span      25796 days (70.63 yr)      first obs. used      1950-03-21      last obs. used      2020-11-04      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .45525      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:07:49   Additional Information  Earth MOID = .984854 au   Jupiter MOID = 2.51249 au   T_jup = 3.621  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.2   n/a MPO439090   diameter diameter 5.438 km 0.119 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 3.8811 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Oey, J.; Pravec, P.; Kusnirak, P.; Morales, N.; et al. (2011) CBET 2766.] [Oey, J. (2016) Minor Planet Bull. 43, 45-51.] geometric albedo albedo 0.261   0.062 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   2691 Sersic (1974 KB)          Discovered 1974-May-18 by Felix Aguilar Observatory at El Leoncito Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1974 KB = 1938 UU = 1978 QR1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-26 00:56 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin