+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   806 Gyldenia (A915 HE) Classification: Outer Main-belt Asteroid          SPK-ID: 2000806 [ 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 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07861667057922551 3.9399e-08   a 3.21075265068385 1.5852e-08 au q 2.958333967233663 1.2515e-07 au i 14.19972426025658 4.1445e-06 deg node 43.69903059568031 1.7174e-05 deg peri 121.2078581731782 3.0739e-05 deg M 158.745497854771 2.6145e-05 deg tp 2458273.867308583705 (2018-Jun-04.36730858) 0.00015203 TDB period 2101.399872234805 5.75 1.5562e-05 4.261e-08 d yr n .171314372269922 1.2687e-09 deg/d Q 3.463171334134037 1.7098e-08 au   Orbit Determination Parameters    # obs. used (total)      2584      data-arc span      38600 days (105.68 yr)      first obs. used      1915-04-18      last obs. used      2020-12-22      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .36514      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 00:49:57   Additional Information  Earth MOID = 1.99031 au   Jupiter MOID = 1.57693 au   T_jup = 3.139  [ 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 10.25   n/a E2021B10   diameter diameter 83.103 km 0.741 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 16.852 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Alkema, M.S. (2013) Minor Planet Bull. 40, 215-216.] [Marciniak, A.; Pilcher, F.; Oszkiewicz, D.; Santana-Ros, T.; et al. (2015) Planet. Space Sci. 118, 256-266.] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] geometric albedo albedo 0.023   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   806 Gyldenia (A915 HE)          Discovered 1915-Apr-18 by Wolf, M. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A915 HE = 1950 LT  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-27 05:06 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin