+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1680 Per Brahe (1942 CH) Classification: Main-belt Asteroid          SPK-ID: 2001680 [ 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 42 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1826193017901294 3.0323e-08   a 2.724213038441092 8.2012e-09 au q 2.226719155433413 8.2064e-08 au i 4.260794145232255 3.1403e-06 deg node 83.33760303317085 4.7306e-05 deg peri 158.4222058253883 4.8089e-05 deg M 77.46406668460557 9.1515e-06 deg tp 2458647.107100222078 (2019-Jun-12.60710022) 4.1569e-05 TDB period 1642.328493261697 4.50 7.4163e-06 2.03e-08 d yr n .219200970741872 9.8985e-10 deg/d Q 3.221706921448772 9.6989e-09 au   Orbit Determination Parameters    # obs. used (total)      3246      data-arc span      43285 days (118.51 yr)      first obs. used      1902-05-08      last obs. used      2020-11-09      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42268      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:02:06   Additional Information  Earth MOID = 1.21457 au   Jupiter MOID = 1.79669 au   T_jup = 3.329  [ 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 11.1   n/a MPO395007   diameter diameter 13.960 km 0.125 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 3.428 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Stephens, Robert D.; Warner, Brian D. (2013) Minor Planet Bull. 40, 93-94.] [Behrend, R. (2019) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.300   0.044 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) 1680 Per Brahe           Discovered 1942 Feb. 12 by L. Oterma at Turku. Named in memory of the Swedish count Per Brahe (1602-1680), who was governor general of Finland. The "count's epoch" was a happy era, with the establishment of Academia Aboensis, the first university in Finland, the construction of various new towns and many schools, and the publication of the first Finnish Bible. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC 5280 Last Updated: 2007-10-23 [ show close-approach data ] Alternate Designations  1942 CH = 1934 PP = 1937 AA = 1937 AY = 1938 JA = 1943 PC = 1949 XL = 1952 OG = 1953 VD1 = 1960 FF = A902 JA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-28 06:54 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin