+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1392 Pierre (1936 FO) Classification: Main-belt Asteroid          SPK-ID: 2001392 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2032997848882762 2.4497e-08   a 2.606416607656042 7.6543e-09 au q 2.076532671990338 6.3154e-08 au i 12.26573292563336 6.4494e-07 deg node 358.2328242815311 2.6102e-06 deg peri 44.11082467814046 7.0605e-06 deg M 211.3834154560942 4.4497e-06 deg tp 2460030.996095202997 (2023-Mar-27.49609520) 2.0685e-05 TDB period 1536.965709271816 4.21 6.7704e-06 1.854e-08 d yr n .2342277370459754 1.0318e-09 deg/d Q 3.136300543321746 9.2104e-09 au   Orbit Determination Parameters    # obs. used (total)      2863      data-arc span      31148 days (85.28 yr)      first obs. used      1936-03-16      last obs. used      2021-06-26      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .38524      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 12:19:22   Additional Information  Earth MOID = 1.10083 au   Jupiter MOID = 2.39367 au   T_jup = 3.351  [ 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 11.97   n/a E2021B10 IRAS observations used: 4 diameter diameter 26.44 km 1.6 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 4 rotation period rot_per 18. h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Barucci, M.A.; Di Martino, M.; Fulchignoni, M. (1992) Astron. J. 103, 1679-1686.] geometric albedo albedo 0.0519   0.007 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 4 B-V BV 0.757   0.025 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=6.15 deg. U-B UB 0.258   0.073 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=6.15 deg. Tholen spectral type spec_T DX   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices 1392 Pierre (1936 FO)          Discovered 1936-Mar-16 by Boyer, L. at Algiers Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1936 FO = 1938 SZ = 1955 TZ = 1959 SH = A917 UB  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jul-26 14:59 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin