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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1617994970266587 1.6589e-08  
a 2.229200347766509 5.7131e-09 au
q 1.868516852726236 3.8553e-08 au
i 2.946492751289674 1.961e-07 deg
node 216.7394279910778 5.9458e-06 deg
peri 160.161022102234 9.4625e-06 deg
M 163.7612030334112 6.3172e-06 deg
tp 2458647.493037248225
(2019-Jun-12.99303725)
2.06e-05 TDB
period 1215.687860756747
3.33
4.6734e-06
1.28e-08
d
yr
n .2961286458646594 1.1384e-09 deg/d
Q 2.589883842806783 6.6374e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2608  
   data-arc span      33353 days (91.32 yr)  
   first obs. used      1929-11-27  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46719  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 20:32:39  

Additional Information
 Earth MOID = .869043 au 
 Jupiter MOID = 2.87516 au 
 T_jup = 3.624 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456634.5 (2013-Dec-08.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1622860252467536 1.661e-08  
q 1.867297010509617 3.8613e-08 au
tp 2456214.949971612603
(2012-Oct-14.44997161)
1.9684e-05 TDB
node 216.7830187818487 5.9497e-06 deg
peri 159.9005686729476 9.4341e-06 deg
i 2.944556426435326 1.9595e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2608  
   data-arc span      33353 days (91.32 yr)  
   first obs. used      1929-11-27  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46719  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 20:32:39  

Additional Information
 Jupiter MOID = 2.87516 au 
 T_jup = 3.624 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.759049859231579E-16 -6.368567550474914E-16 -2.146693234488998E-14 -6.722587319788474E-15 2.413634314849983E-14 -2.127850903952629E-16
q -6.368567550474914E-16 1.490998542094424E-15 3.32838596585052E-14 1.482280279535407E-14 -5.500562935206503E-14 4.959862596330964E-16
tp -2.146693234488998E-14 3.32838596585052E-14 3.874793766663875E-10 -1.764920981357785E-11 1.372997534992526E-10 2.034346731256329E-13
node -6.722587319788474E-15 1.482280279535407E-14 -1.764920981357785E-11 3.539840517132288E-11 -4.185474298738471E-11 6.120040101111178E-13
peri 2.413634314849983E-14 -5.500562935206503E-14 1.372997534992526E-10 -4.185474298738471E-11 8.900139838755106E-11 -5.600191789134123E-13
i -2.127850903952629E-16 4.959862596330964E-16 2.034346731256329E-13 6.120040101111178E-13 -5.600191789134123E-13 3.83960288494485E-14

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.98   n/a MPCxxxxx  
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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