+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   265 Anna (A887 DA) Classification: Main-belt Asteroid          SPK-ID: 2000265 [ 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 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2674489467550866 9.7454e-09   a 2.41918248534486 6.5025e-09 au q 1.772174677631025 2.2938e-08 au i 25.65004639531661 7.3735e-07 deg node 335.52918317533 1.8614e-06 deg peri 251.5881477547426 4.1372e-06 deg M 143.824409830313 3.6106e-06 deg tp 2458651.425251790734 (2019-Jun-16.92525179) 1.2702e-05 TDB period 1374.362735703538 3.76 5.5412e-06 1.517e-08 d yr n .2619395816314211 1.0561e-09 deg/d Q 3.066190293058696 8.2416e-09 au   Orbit Determination Parameters    # obs. used (total)      2866      data-arc span      44400 days (121.56 yr)      first obs. used      1899-08-14      last obs. used      2021-03-07      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .36448      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 10:36:18   Additional Information  Earth MOID = .911465 au   Jupiter MOID = 2.32827 au   T_jup = 3.335  [ 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 11.94   n/a E2021B10   diameter diameter 22.767 km 0.379 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 11.681 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Bembrick, C.S.; Bolt, G. (2005) Minor Planet Bull. 32, 18-19.] [Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.] geometric albedo albedo 0.113   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   265 Anna (A887 DA)          Discovered 1887-Feb-25 by Palisa, J. at Vienna Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A887 DA = 1933 QN = 1933 RC  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-22 12:41 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin