+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   623 Chimaera (A907 BC) Classification: Main-belt Asteroid          SPK-ID: 2000623 [ 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 74 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1117776420809135 3.4383e-08   a 2.463104421400029 7.6564e-09 au q 2.187784416976861 8.298e-08 au i 14.12881286883441 4.6975e-06 deg node 308.3116773148507 1.5863e-05 deg peri 124.2021077879636 2.7354e-05 deg M 234.7922976906258 2.294e-05 deg tp 2459691.578824594421 (2022-Apr-22.07882459) 9.0842e-05 TDB period 1411.9608745568 3.87 6.5835e-06 1.802e-08 d yr n .2549645719560042 1.1888e-09 deg/d Q 2.738424425823198 8.5122e-09 au   Orbit Determination Parameters    # obs. used (total)      2449      data-arc span      40572 days (111.08 yr)      first obs. used      1909-09-12      last obs. used      2020-10-11      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .40268      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:27:37   Additional Information  Earth MOID = 1.23393 au   Jupiter MOID = 2.48658 au   T_jup = 3.439  [ 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 10.81   n/a E2021B10 IRAS observations used: 8 diameter diameter 44.09 km 1.0 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 8 rotation period rot_per 14.635 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Fleenor, M.L. (2007) Minor Planet Bull. 34, 66-67.] geometric albedo albedo 0.0372   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 8 B-V BV 0.714   0.067 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=10.59, mean=10.66, max.=10.73) deg. U-B UB 0.324   0.063 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=10.73 deg. Tholen spectral type spec_T XC   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices 623 Chimaera (A907 BC)          Discovered 1907-Jan-22 by Lohnert, K. at Heidelberg 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-Mar-03 03:24 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin