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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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456524.5 (2013-Aug-20.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1621891173721936 3.0725e-08  
q 1.867845503468286 6.8871e-08 au
tp 2456215.049935714027
(2012-Oct-14.54993571)
3.5552e-05 TDB
node 216.7922055880186 6.8163e-05 deg
peri 159.9508016384386 6.8957e-05 deg
i 2.944449070507674 3.2636e-06 deg
  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
 Jupiter MOID = 2.87516 au 
 T_jup = 3.624 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.440332269132964E-16 -2.110088222323876E-15 -1.630222173283024E-13 -3.179966574036812E-15 -5.67723529616212E-14 1.589512999652621E-16
q -2.110088222323876E-15 4.74318284214201E-15 3.946555105636386E-13 6.942933450081311E-15 1.369452006933519E-13 -3.104251083763965E-16
tp -1.630222173283024E-13 3.946555105636386E-13 1.263913436835785E-9 -6.368988299471868E-12 3.826973011868872E-10 -5.224815422736329E-14
node -3.179966574036812E-15 6.942933450081311E-15 -6.368988299471868E-12 4.646177683994623E-9 -4.64155017161286E-9 -3.508513708735405E-11
peri -5.67723529616212E-14 1.369452006933519E-13 3.826973011868872E-10 -4.64155017161286E-9 4.755125786353472E-9 3.502031848576637E-11
i 1.589512999652621E-16 -3.104251083763965E-16 -5.224815422736329E-14 -3.508513708735405E-11 3.502031848576637E-11 1.065122390498738E-11

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.DBLast 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 ]
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