+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2117 Danmark (1978 AC) Classification: Main-belt Asteroid          SPK-ID: 2002117 [ 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 44 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .06718802160245101 3.2769e-08   a 2.87147685607183 1.2853e-08 au q 2.678548007035138 9.4041e-08 au i 2.931988789413361 3.7211e-06 deg node 59.49412619121559 7.1658e-05 deg peri 264.8903285685373 7.7105e-05 deg M 141.4024364481041 2.881e-05 deg tp 2458302.410992933538 (2018-Jul-02.91099293) 0.00014244 TDB period 1777.282265119668 4.87 1.1933e-05 3.267e-08 d yr n .2025564577249413 1.36e-09 deg/d Q 3.064405705108522 1.3717e-08 au   Orbit Determination Parameters    # obs. used (total)      2952      data-arc span      30688 days (84.02 yr)      first obs. used      1936-11-09      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42867      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:04:27   Additional Information  Earth MOID = 1.66835 au   Jupiter MOID = 2.14975 au   T_jup = 3.293  [ 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 11.8   n/a MPO319109   diameter diameter 11.977 km 0.248 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 16.598 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Yankov, A.; Ditteon, R. (2009) Minor Planet Bull. 36, 3-4.] geometric albedo albedo 0.196   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   2117 Danmark (1978 AC)          Discovered 1978-Jan-09 by West, R. M. at La Silla Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1978 AC = 1936 VJ = 1949 KY = 1951 YJ1 = 1969 OE1 = 1975 VW8 = 1977 EG  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-24 21:26 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin