+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   147 Protogeneia (A875 NA) Classification: Main-belt Asteroid          SPK-ID: 2000147 [ 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 56 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .02368395210878288 3.2016e-08   a 3.135853548154724 1.0727e-08 au q 3.061584142900071 9.9064e-08 au i 1.933266175061627 3.3368e-06 deg node 248.2655837503424 0.00010576 deg peri 100.5353440177132 0.00012716 deg M 341.2733661817797 7.0161e-05 deg tp 2459106.008950300029 (2020-Sep-13.50895030) 0.00039528 TDB period 2028.299505224161 5.55 1.0408e-05 2.85e-08 d yr n .177488580494533 9.1075e-10 deg/d Q 3.210122953409377 1.0981e-08 au   Orbit Determination Parameters    # obs. used (total)      3491      data-arc span      49931 days (136.70 yr)      first obs. used      1884-02-28      last obs. used      2020-11-12      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42762      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:51:21   Additional Information  Earth MOID = 2.05484 au   Jupiter MOID = 1.89262 au   T_jup = 3.211  [ 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 8.7   n/a MPO435695   diameter diameter 132.93 km 5.1 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 11 rotation period rot_per 7.8528 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Buchheim, R.K. (2005) Minor Planet Bull. 32, 35-36.] [Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.] geometric albedo albedo 0.0492   0.004 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 11 B-V BV 0.678   0.023 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=1.00, mean=2.06, max.=3.43) deg. U-B UB 0.293   0.028 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=1.00, mean=2.22, max.=3.43) deg. Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B C   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) 147 Protogeneia (A875 NA)          Discovered 1875-Jul-10 by Schulhof, L. at Vienna Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-16 10:15 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin