+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1947 Iso-Heikkila (1935 EA) Classification: Main-belt Asteroid          SPK-ID: 2001947 [ 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 41 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .0380854170405678 3.6731e-08   a 3.153918584960598 1.4814e-08 au q 3.033800280340376 1.172e-07 au i 11.9129847018407 3.8188e-06 deg node 90.91201781664199 1.7799e-05 deg peri 145.1195322882288 5.3677e-05 deg M 13.84699196282079 4.877e-05 deg tp 2458921.808634110593 (2020-Mar-13.30863411) 0.00027742 TDB period 2045.851676396555 5.60 1.4414e-05 3.946e-08 d yr n .1759658357218169 1.2398e-09 deg/d Q 3.274036889580819 1.5379e-08 au   Orbit Determination Parameters    # obs. used (total)      2646      data-arc span      31261 days (85.59 yr)      first obs. used      1935-03-03      last obs. used      2020-10-03      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42824      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:13:59   Additional Information  Earth MOID = 2.02716 au   Jupiter MOID = 1.79262 au   T_jup = 3.172  [ 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 11.4   n/a MPO302072   diameter diameter 31.611 km 0.813 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 5.0158 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong. Published Reference List: [Galad, A. (2010) Astron. Astrophys. 514, A55.] geometric albedo albedo 0.049   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   1947 Iso-Heikkila           Discovered 1935 Mar. 4 by Y. Vaisala at Turku. Named for the farm, owned by Turku University, that became the site of the Turku Observatory. This minor planet was the first one to be discovered there. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC 5450 Last Updated: 2006-03-21 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-21 06:20 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin