+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   523 Ada (A904 BA) Classification: Main-belt Asteroid          SPK-ID: 2000523 [ 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 41 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1787008871617129 1.8401e-08   a 2.966027826594107 9.2276e-09 au q 2.435996022635413 5.6674e-08 au i 4.312940496175035 8.0522e-07 deg node 260.6219944497393 5.8101e-06 deg peri 189.9486038485088 8.0434e-06 deg M 339.6077629107809 3.338e-06 deg tp 2459306.187501142919 (2021-Apr-01.68750114) 1.7388e-05 TDB period 1865.783545227896 5.11 8.707e-06 2.384e-08 d yr n .1929484269066312 9.0043e-10 deg/d Q 3.496059630552801 1.0877e-08 au   Orbit Determination Parameters    # obs. used (total)      3238      data-arc span      43239 days (118.38 yr)      first obs. used      1902-10-25      last obs. used      2021-03-13      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .43959      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 11:00:50   Additional Information  Earth MOID = 1.45242 au   Jupiter MOID = 1.71707 au   T_jup = 3.236  [ 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 9.92   n/a E2021B10   diameter diameter 31.89 km 1.5 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 7 rotation period rot_per 10.03 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Georgilas, S.A.; Wetterer, C.J. (1996) Minor Planet Bull. 23, 41-42.] [Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [LeCrone, C.; Mills, G.; Ditteon, R. (2005) Minor Planet Bull. 32, 62-64.] [Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.] geometric albedo albedo 0.2512   0.026 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 7 SMASSII spectral type spec_B X   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) 523 Ada (A904 BA)          Discovered 1904-Jan-27 by Dugan, R. S. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A904 BA = 1937 NB = 1964 XN = A902 UD  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-23 00:49 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin