+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   11757 Salpeter (2799 P-L) Classification: Main-belt Asteroid          SPK-ID: 2011757 [ 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 13 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2418063233818533 8.0289e-08   a 3.138692526651336 2.3618e-08 au q 2.379736826555677 2.5509e-07 au i 29.62427206145331 1.0517e-05 deg node 185.7406391937084 1.2387e-05 deg peri 162.7558500740442 2.1085e-05 deg M 249.9078039918568 1.6497e-05 deg tp 2459621.620153112691 (2022-Feb-11.12015311) 9.6386e-05 TDB period 2031.054545446887 5.56 2.2925e-05 6.277e-08 d yr n .1772478246864563 2.0007e-09 deg/d Q 3.897648226746995 2.933e-08 au   Orbit Determination Parameters    # obs. used (total)      335      data-arc span      21765 days (59.59 yr)      first obs. used      1960-09-24      last obs. used      2020-04-27      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .56946      source      ORB      producer      Otto Matic      solution date      2020-May-20 03:36:30   Additional Information  Earth MOID = 1.38607 au   Jupiter MOID = 1.61446 au   T_jup = 2.968  [ 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 15.0   n/a MPO452336   diameter diameter 6.697 km 1.888 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)   geometric albedo albedo 0.032   0.030 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   11757 Salpeter           Discovered 1960 Sept. 24 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels. Edwin E. Salpeter (b. 1924), born in Austria, educated in Australia and the U.K., has been at Cornell University since 1948. A generalist, he worked with Hans Bethe in quantum electrodynamics and nuclear physics and is best known for the triple- \alpha helium-burning reaction and for the initial mass function of stars. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20040306/MPCPages.arc Last Updated: 2004-03-08 [ show close-approach data ] Alternate Designations  2799 P-L = 5180 T-3  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-21 03:03 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin