+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   331 Etheridgea (A892 GA) Classification: Main-belt Asteroid          SPK-ID: 2000331 [ 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 43 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09602959004065732 1.1082e-08   a 3.02460046950415 1.0127e-08 au q 2.734149326380886 3.2032e-08 au i 6.036899744109647 1.0028e-06 deg node 21.86197936341731 1.0075e-05 deg peri 333.4925038455217 2.0156e-05 deg M 27.76128598254775 1.3294e-05 deg tp 2459052.337762156315 (2020-Jul-21.83776216) 7.1007e-05 TDB period 1921.323300990381 5.26 9.6497e-06 2.642e-08 d yr n .1873708603931631 9.4106e-10 deg/d Q 3.315051612627413 1.11e-08 au   Orbit Determination Parameters    # obs. used (total)      3736      data-arc span      47086 days (128.91 yr)      first obs. used      1892-04-02      last obs. used      2021-03-03      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .41766      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 10:42:54   Additional Information  Earth MOID = 1.72985 au   Jupiter MOID = 2.12496 au   T_jup = 3.230  [ 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 9.79   n/a E2021B10 IRAS observations used: 11 diameter diameter 74.92 km 2.7 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 11 rotation period rot_per 25.315 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Pilcher, F. (2016) Minor Planet Bull. 43, 135-136.] geometric albedo albedo 0.0447   0.003 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 11 B-V BV 0.698   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=4.13, mean=4.77, max.=5.40) deg. U-B UB 0.298   0.015 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=4.13, mean=4.77, max.=5.40) deg. Tholen spectral type spec_T CX   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices SMASSII spectral type spec_B C   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) 331 Etheridgea (A892 GA)          Discovered 1892-Apr-01 by Charlois, A. at Nice Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A892 GA = 1949 CM  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-17 06:06 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin