+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 45 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .112138152353662 1.5535e-08   a 2.244595878717087 5.945e-09 au q 1.992891044097108 3.3959e-08 au i 3.593726626371202 5.6279e-07 deg node 319.8355647860672 1.6614e-05 deg peri 277.165993714964 1.738e-05 deg M 304.3559055656505 8.5198e-06 deg tp 2459390.355090799306 (2021-Jun-24.85509080) 2.9326e-05 TDB period 1228.303441408126 3.36 4.8799e-06 1.336e-08 d yr n .2930871866542166 1.1644e-09 deg/d Q 2.496300713337066 6.6117e-09 au   Orbit Determination Parameters    # obs. used (total)      3020      data-arc span      25935 days (71.01 yr)      first obs. used      1950-03-21      last obs. used      2021-03-23      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .44997      source      ORB      producer      Otto Matic      solution date      2021-May-03 20:26:23   Additional Information  Earth MOID = .983477 au   Jupiter MOID = 2.51182 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 13.32   n/a E2021B10   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-May-14 02:22 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin