+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1480 Aunus (1938 DK) Classification: Main-belt Asteroid          SPK-ID: 2001480 [ 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 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1086753964330948 2.59e-08   a 2.202860784100475 5.0523e-09 au q 1.963464015101438 5.6016e-08 au i 4.860658070708141 3.6807e-06 deg node 63.66965123189188 3.4542e-05 deg peri 64.91307908609576 3.9355e-05 deg M 145.3840241022917 1.835e-05 deg tp 2458718.226733079718 (2019-Aug-22.72673308) 6.0497e-05 TDB period 1194.20532732774 3.27 4.1084e-06 1.125e-08 d yr n .3014556975772064 1.0371e-09 deg/d Q 2.442257553099513 5.6013e-09 au   Orbit Determination Parameters    # obs. used (total)      2638      data-arc span      29108 days (79.69 yr)      first obs. used      1940-12-28      last obs. used      2020-09-07      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42345      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 19:04:36   Additional Information  Earth MOID = .984288 au   Jupiter MOID = 2.59891 au   T_jup = 3.651  [ 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 13.20   n/a E2021B10   diameter diameter 6.385 km 0.069 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 5.1600 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Benishek, V.; Pravec, P.; Oey, J.; Durkee, R.; et al. (2020). CBET 4789.] [Pravec, P.; Wolf, M.; Sarounova, L. (2020) http://www.asu.cas.cz/~ppravec/neo.htm] geometric albedo albedo 0.257   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   SMASSII spectral type spec_B S   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) 1480 Aunus (1938 DK)          Discovered 1938-Feb-18 by Vaisala, Y. at Turku Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1938 DK = 1992 WX9  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Feb-27 20:16 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin