+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1535 Paijanne (1939 RC) Classification: Main-belt Asteroid          SPK-ID: 2001535 [ 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 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1923941287420403 3.4088e-08   a 3.16505483523769 1.371e-08 au q 2.556116867791353 1.0984e-07 au i 6.056475837245467 3.5608e-06 deg node 264.7741640650282 3.7478e-05 deg peri 40.12209044654317 3.8476e-05 deg M 232.8068962564908 1.0353e-05 deg tp 2459927.160158300152 (2022-Dec-13.66015830) 6.0473e-05 TDB period 2056.696859254089 5.63 1.3364e-05 3.659e-08 d yr n .1750379490201404 1.1373e-09 deg/d Q 3.773992802684027 1.6348e-08 au   Orbit Determination Parameters    # obs. used (total)      3087      data-arc span      31922 days (87.40 yr)      first obs. used      1933-08-28      last obs. used      2021-01-20      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41446      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 00:56:13   Additional Information  Earth MOID = 1.54265 au   Jupiter MOID = 1.49091 au   T_jup = 3.166  [ 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 11.49   n/a E2021B10   diameter diameter 23.836 km 0.206 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 8.8448 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.164   0.031 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   1535 Paijanne (1939 RC)          Discovered 1939-Sep-09 by Vaisala, Y. at Turku Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1939 RC = 1933 QE1 = 1944 OA = 1956 XB = 1985 XE2 = A916 OB  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-25 17:19 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin