+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2820 Iisalmi (1942 RU) Classification: Main-belt Asteroid          SPK-ID: 2002820 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ 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 .1616450826356335 3.0614e-08   a 2.229477638729001 6.2036e-09 au q 1.869093541582355 6.8534e-08 au i 2.946246058839302 3.2651e-06 deg node 216.7469561772008 6.8508e-05 deg peri 160.1715982025324 6.9322e-05 deg M 104.5304180901851 1.1722e-05 deg tp 2458647.444245292736 (2019-Jun-12.94424529) 3.8971e-05 TDB period 1215.914697528119 3.33 5.075e-06 1.389e-08 d yr n .2960734011455394 1.2358e-09 deg/d Q 2.589861735875648 7.2064e-09 au   Orbit Determination Parameters    # obs. used (total)      2444      data-arc span      33227 days (90.97 yr)      first obs. used      1929-11-27      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46841      source      ORB      producer      Otto Matic      solution date      2020-Dec-17 19:45:36   Additional Information  Earth MOID = .871024 au   Jupiter MOID = 2.87399 au   T_jup = 3.624  [ 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 12.9   n/a MPO302078   diameter diameter 6.826 km 0.355 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 2.7580 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.264   0.036 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   2820 Iisalmi (1942 RU)          Discovered 1942-Sep-08 by Vaisala, Y. at Turku Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1942 RU = 1929 WM = 1952 SH1 = 1959 VE = 1972 RG3 = 1979 WE4 = 1979 XN = 1979 YS5  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-18 17:39 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin