+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1757 Porvoo (1939 FC) Classification: Main-belt Asteroid          SPK-ID: 2001757 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1266214890614281 1.6522e-08   a 2.351349934328482 5.7275e-09 au q 2.053618504339318 3.8831e-08 au i 3.974407857852356 9.3453e-07 deg node 39.38882722464101 1.3759e-05 deg peri 149.107186712435 1.3302e-05 deg M 285.0207253995941 6.1593e-06 deg tp 2459670.791949244675 (2022-Apr-01.29194924) 2.3102e-05 TDB period 1316.965284798159 3.61 4.8118e-06 1.317e-08 d yr n .2733557248285207 9.9877e-10 deg/d Q 2.649081364317645 6.4527e-09 au   Orbit Determination Parameters    # obs. used (total)      3139      data-arc span      29989 days (82.11 yr)      first obs. used      1939-03-17      last obs. used      2021-04-24      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .44282      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 12:45:23   Additional Information  Earth MOID = 1.05596 au   Jupiter MOID = 2.30437 au   T_jup = 3.543  [ 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 13.46   n/a E2021B10   diameter diameter 10.220 km 2.353 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)   rotation period rot_per 4.89 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Binzel, R.P.; Mulholland, J.D. (1983) Icarus 56, 519-533.] geometric albedo albedo 0.068   0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)   1757 Porvoo           Discovered 1939 Mar. 17 by Y. Vaisala at Turku. Named for the second oldest (after Turku) town in Finland. At the Porvoo Diet in 1809 the Russian czar confirmed that Finland was annexed to the Russian empire as an autonomous nation. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC 5449 Last Updated: 2006-03-21 Alternate Designations  1939 FC = 1964 BB = 1968 FK  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jul-29 21:45 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin