+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 43 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1617994918630203 3.0604e-08   a 2.229200354407036 6.2e-09 au q 1.868516869803113 6.8516e-08 au i 2.946492276919435 3.2629e-06 deg node 216.7393550443398 6.8117e-05 deg peri 160.1611174902644 6.8925e-05 deg M 163.761175290479 1.1803e-05 deg tp 2458647.493128462617 (2019-Jun-12.99312846) 3.8852e-05 TDB period 1215.687866188834 3.33 5.0718e-06 1.389e-08 d yr n .2961286445414606 1.2354e-09 deg/d Q 2.58988383901096 7.2032e-09 au   Orbit Determination Parameters    # obs. used (total)      2522      data-arc span      33290 days (91.14 yr)      first obs. used      1929-11-27      last obs. used      2021-01-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46777      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 01:05:54   Additional Information  Earth MOID = .869043 au   Jupiter MOID = 2.87516 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 12.97   n/a E2021B10   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-Feb-27 03:16 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin