+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   234 Barbara (A883 PA) Classification: Main-belt Asteroid          SPK-ID: 2000234 [ 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 84 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2450520930438709 3.5217e-08   a 2.385335770982288 5.4544e-09 au q 1.800804247690663 8.4748e-08 au i 15.37567411710235 4.036e-06 deg node 144.5041019705316 1.4018e-05 deg peri 192.1852323794545 1.5844e-05 deg M 31.70881336469736 9.3494e-06 deg tp 2458881.977665415700 (2020-Feb-02.47766542) 3.4713e-05 TDB period 1345.620851830806 3.68 4.6154e-06 1.264e-08 d yr n .2675344986741221 9.1763e-10 deg/d Q 2.969867294273913 6.791e-09 au   Orbit Determination Parameters    # obs. used (total)      4633      data-arc span      50092 days (137.14 yr)      first obs. used      1883-09-24      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .38488      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:52:00   Additional Information  Earth MOID = .793029 au   Jupiter MOID = 2.41983 au   T_jup = 3.447  [ 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 9.1   n/a MPO492751 IRAS observations used: 11 diameter diameter 45.476 km 0.245 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 26.4744 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Schober, H.J. (1981) Astron. Astrophys. 96, 302-305.] [Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Hamanowa, H.; Hamanowa, H. (2011) http://www2.ocn.ne.jp/~hamaten/astlcdata.htm] [Pilcher, F. (2014) Minor Planet Bull. 41, 155-156.] [Tanga, P.; Carry, B.; Colars, F.; Delbo, M.; et al. (2015) arXiv:1502.00460v1.] [Franco, L.; Marchini, A.; Baj, G.; Papini, R.; et al. (2019) Minor Planet Bull. 46, 441-443.] geometric albedo albedo 0.205   0.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.897   0.037 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=.76, mean=10.85, max.=15.90) deg. U-B UB 0.488   0.028 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=.76, mean=10.85, max.=15.90) 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 Ld   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) 234 Barbara (A883 PA)          Discovered 1883-Aug-12 by Peters, C. H. F. at Clinton Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A883 PA = 1942 RL1 = 1953 RE = 1975 XP  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-18 20:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin