+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   726 Joella (A911 WC) Classification: Main-belt Asteroid          SPK-ID: 2000726 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2853079439842592 3.1975e-08   a 2.564910554030405 8.0175e-09 au q 1.833121197356463 8.0773e-08 au i 15.43666232201682 4.1185e-06 deg node 241.9694609914936 1.4444e-05 deg peri 113.2262531328274 1.6917e-05 deg M 226.9993461057739 1.1898e-05 deg tp 2459754.816797379136 (2022-Jun-24.31679738) 5.113e-05 TDB period 1500.398992137227 4.11 7.035e-06 1.926e-08 d yr n .2399361782342989 1.125e-09 deg/d Q 3.296699910704347 1.0305e-08 au   Orbit Determination Parameters    # obs. used (total)      2531      data-arc span      32731 days (89.61 yr)      first obs. used      1931-07-14      last obs. used      2021-02-22      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .35688      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 11:20:35   Additional Information  Earth MOID = .88997 au   Jupiter MOID = 2.41966 au   T_jup = 3.326  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 10.49   n/a E2021B10 IRAS observations used: 12 diameter diameter 44.02 km 3.5 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 12 rotation period rot_per 13.04 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Binzel, R.P.; Mulholland, J.D. (1983) Icarus 56, 519-533.] geometric albedo albedo 0.0539   0.010 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 12 726 Joella (A911 WC)          Discovered 1911-Nov-22 by Metcalf, J. H. at Winchester Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-14 18:37 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin