+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   57 Mnemosyne Classification: Main-belt Asteroid          SPK-ID: 2000057 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2457800.5 (2017-Feb-16.0) TDB Reference: JPL 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1140442015802971 4.7954e-08   a 3.152460624036448 8.8603e-09 au q 2.792940769154887 1.5228e-07 au i 15.21578357188851 5.7412e-06 deg node 199.2028014248046 1.8559e-05 deg peri 210.9520943466867 2.5915e-05 deg M 1.931724789181171 1.9867e-05 deg tp 2457789.529771208808 (2017-Feb-05.02977121) 0.00011281 JED period 2044.433237564362 5.60 8.6191e-06 2.36e-08 d yr n .1760879217698918 7.4237e-10 deg/d Q 3.51198047891801 9.8708e-09 au   Orbit Determination Parameters    # obs. used (total)      1840      data-arc span      57299 days (156.88 yr)      first obs. used      1859-12-22      last obs. used      2016-11-07      planetary ephem.      DE431      SB-pert. ephem.      SB431-BIG16      condition code      0      fit RMS      .523      data source      ORB      producer      Otto Matic      solution date      2016-Nov-20 21:06:11   Additional Information  Earth MOID = 1.81255 au   Jupiter MOID = 1.95164 au   T_jup = 3.143  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 7.03 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5 diameter diameter 112.59 km 2.8 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5 rotation period rot_per 12.463 h n/a LCDB (Rev. 2016-September); Warner et al., 2009 Published Reference List: [Harris, A.W.; Young, J.W.; Dockweiler, T.; Gibson, J.; et al. (1992) Icarus 95, 115-147.] [Ditteon, R.; Hawkins, S. (2007) Minor Planet Bul. 34, 59-64.] geometric albedo albedo 0.2149   0.011 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5 B-V BV .817 mag .011 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=12.12, mean=12.51, max.=12.91) deg. U-B UB .410 mag .029 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=2; phase (min.=12.12, mean=12.51, max.=12.91) deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 57 Mnemosyne          Discovered 1859-Sep-22 by Luther, R. at Dusseldorf Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1959 NT  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2017-Jan-08 03:21 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin