+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   445 Edna (A899 TC) Classification: Main-belt Asteroid          SPK-ID: 2000445 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 42 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1969606571425402 3.6215e-08   a 3.198458503410937 1.2752e-08 au q 2.568488014735973 1.1623e-07 au i 21.30998127470416 4.8273e-06 deg node 292.0130784946193 1.1431e-05 deg peri 81.62147382432568 1.6703e-05 deg M 71.17140849864437 1.1358e-05 deg tp 2458587.440545008794 (2019-Apr-13.94054501) 6.5743e-05 TDB period 2089.341871036128 5.72 1.2495e-05 3.421e-08 d yr n .1723030610694036 1.0305e-09 deg/d Q 3.828428992085901 1.5264e-08 au   Orbit Determination Parameters    # obs. used (total)      2588      data-arc span      44238 days (121.12 yr)      first obs. used      1899-10-04      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .36654      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:53:44   Additional Information  Earth MOID = 1.67022 au   Jupiter MOID = 2.00617 au   T_jup = 3.059  [ 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 9.2   n/a MPO502157 IRAS observations used: 25 diameter diameter 87.812 km 0.433 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 19.959 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Malcolm, G. (2002) Minor Planet Bull. 29, 28-29.] [Pilcher, F. (2019) Minor Planet Bull. 46, 58-60.] [Polakis, T. (2020) Minor Planet Bull. 47, 177-186.] geometric albedo albedo 0.044   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.684   0.036 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=18.87, mean=19.14, max.=19.41) deg. U-B UB 0.368   0.032 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=18.87, mean=19.14, max.=19.41) deg. Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices 445 Edna (A899 TC)          Discovered 1899-Oct-02 by Coddington, E. F. at Mount Hamilton Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A899 TC = 1978 PJ5 = A918 CB  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-23 17:13 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin