+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   8191 Mersenne (1993 OX9) Classification: Main-belt Asteroid          SPK-ID: 2008191 [ 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 26 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1097764445858219 3.0998e-08   a 2.263972066576253 7.0294e-09 au q 2.015441262465897 7.1938e-08 au i 2.826855712808463 3.8958e-06 deg node 302.5467010477839 7.5408e-05 deg peri 109.8830103289044 7.8026e-05 deg M 214.8859403616044 2.0712e-05 deg tp 2459502.047435544106 (2021-Oct-14.54743554) 7.2564e-05 TDB period 1244.242475510656 3.41 5.7949e-06 1.587e-08 d yr n .2893326719554808 1.3475e-09 deg/d Q 2.51250287068661 7.801e-09 au   Orbit Determination Parameters    # obs. used (total)      1673      data-arc span      14457 days (39.58 yr)      first obs. used      1980-11-01      last obs. used      2020-06-01      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51158      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 16:46:54   Additional Information  Earth MOID = 1.02848 au   Jupiter MOID = 2.78089 au   T_jup = 3.608  [ 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 14.8   n/a MPO425888   diameter diameter 2.890 km 0.580 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.306   0.104 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   8191 Mersenne           Named for Marin Mersenne (1588-1648), French mathematician and philosopher, best known for his discovery of prime numbers of the form 2n-1 and that n is then necessarily also prime. The number 8191 = 213-1 is the fifth Mersenne prime. Mersenne correctly verified that the numbers are prime also for n = 17 , 19 and 31---and that they are not prime for n = 11 , 23 and 29. The largest prime Mersenne correctly established was for n = 127 . Name proposed by the discoverer, following a suggestion by B. G. Marsden, who wrote the citation. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 19980411/MPCPages.arc Last Updated: 2009-11-17 [ show close-approach data ] Alternate Designations  1993 OX9 = 1980 VA4 = 1990 SG20  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Sep-21 12:53 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin