+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   451 Patientia (A899 XA) Classification: Main-belt Asteroid          SPK-ID: 2000451 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 122 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07370749573617849 3.2737e-08   a 3.06340688302942 6.0922e-09 au q 2.837610833260349 1.0063e-07 au i 15.23340969640724 3.5518e-06 deg node 89.24584852851532 1.3519e-05 deg peri 336.3943148040328 2.753e-05 deg M 214.4428433561291 2.4895e-05 deg tp 2459992.338320261070 (2023-Feb-16.83832026) 0.00013658 TDB period 1958.418272702558 5.36 5.842e-06 1.599e-08 d yr n .1838218142762786 5.4835e-10 deg/d Q 3.289202932798491 6.5412e-09 au   Orbit Determination Parameters    # obs. used (total)      3394      data-arc span      44293 days (121.27 yr)      first obs. used      1899-12-07      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .46138      source      ORB      producer      Otto Matic      solution date      2021-May-03 18:25:21   Additional Information  Earth MOID = 1.85776 au   Jupiter MOID = 1.97305 au   T_jup = 3.175  [ 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 6.81   n/a E2021B10 IRAS observations used: 17 magnitude slope G 0.19   n/a PDS3 (MPC 17258) Fit diameter diameter 253.900 km 2.780 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 9.727 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Harris, A.W.; Young, J.W. (1983) Icarus 54, 59-109.] [Michalowski, T.; Kaasalainen, M.; Marciniak, A.; Denchev, P.; et al. (2005) Astron. Astrophys. 443, 329-335.] [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2014) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2019) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.085   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.666   0.010 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=10; phase (min.=1.70, mean=9.61, max.=18.97) deg. U-B UB 0.310   0.044 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=9; phase (min.=1.70, mean=9.60, max.=17.68) deg. Tholen spectral type spec_T CU   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo 451 Patientia (A899 XA)          Discovered 1899-Dec-04 by Charlois, A. at Nice Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A899 XA = A902 MB  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jun-14 00:55 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin