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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .161970390817551 1.606e-08  
a 2.228885357307024 5.3649e-09 au
q 1.867871924896489 3.697e-08 au
i 2.946871049619498 1.9601e-07 deg
node 216.7377054564223 5.9229e-06 deg
peri 160.1596574069804 9.0386e-06 deg
M 221.8167360847392 6.3406e-06 deg
tp 2459863.033645166041
(2022-Oct-10.53364517)
2.2296e-05 TDB
period 1215.430201176673
3.33
4.3883e-06
1.201e-08
d
yr
n .2961914223058464 1.0694e-09 deg/d
Q 2.589898789717559 6.2339e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2932  
   data-arc span      33449 days (91.58 yr)  
   first obs. used      1929-11-27  
   last obs. used      2021-06-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44803  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-07 21:59:21  

Additional Information
 Earth MOID = .869016 au 
 Jupiter MOID = 2.87613 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 12.98   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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