+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1033 Simona (A924 RH) Classification: Main-belt Asteroid          SPK-ID: 2001033 [ 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 44 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1182545823344403 1.7672e-08   a 3.000674040432306 1.1482e-08 au q 2.645830585059186 5.3445e-08 au i 10.66532995446385 1.4717e-06 deg node 188.9342233209313 5.2342e-06 deg peri 217.55573777547 8.829e-06 deg M 135.9594795083405 1.0195e-05 deg tp 2458483.476068360428 (2018-Dec-30.97606836) 5.2345e-05 TDB period 1898.570194029103 5.20 1.0898e-05 2.984e-08 d yr n .1896163761193449 1.0884e-09 deg/d Q 3.355517495805426 1.284e-08 au   Orbit Determination Parameters    # obs. used (total)      3078      data-arc span      31163 days (85.32 yr)      first obs. used      1935-11-19      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .39896      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 11:50:50   Additional Information  Earth MOID = 1.662 au   Jupiter MOID = 2.10049 au   T_jup = 3.216  [ 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 11.24   n/a E2021B10   diameter diameter 19.195 km 0.194 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 10.07 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong. Published Reference List: [Shipley, H.; Dillard, A.; Kendall, J.; Reichert, M.; et al. (2008) Minor Planet Bull. 35, 99-101.] geometric albedo albedo 0.196   0.041 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   1033 Simona (A924 RH)          Discovered 1924-Sep-04 by Van Biesbroeck, G. at Williams Bay Independent discovery Sept. 5 by S. Belyavskij, Simeis, was announced first. Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A924 RH = 1937 CG  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-22 02:38 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin