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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 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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456472.5 (2013-Jun-29.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1621347644776114 3.0741e-08  
q 1.86818376797712 6.8901e-08 au
tp 2456215.128089177068
(2012-Oct-14.62808918)
3.5702e-05 TDB
node 216.7976823440539 6.8542e-05 deg
peri 159.9880837957372 6.9341e-05 deg
i 2.944487452558954 3.2661e-06 deg
  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
 Jupiter MOID = 2.87399 au 
 T_jup = 3.624 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.44999419075819E-16 -2.112074886402609E-15 -1.658729434085018E-13 -3.422231160833474E-15 -5.756200677191652E-14 1.593275916096568E-16
q -2.112074886402609E-15 4.747391377682251E-15 3.997277134460562E-13 7.610297657273449E-15 1.381330852846769E-13 -3.156849952626726E-16
tp -1.658729434085018E-13 3.997277134460562E-13 1.274636153874717E-9 -6.510130257520462E-12 3.865731590261181E-10 -6.079930034212336E-14
node -3.422231160833474E-15 7.610297657273449E-15 -6.510130257520462E-12 4.698044453026488E-9 -4.693384473033256E-9 -3.41505842796941E-11
peri -5.756200677191652E-14 1.381330852846769E-13 3.865731590261181E-10 -4.693384473033256E-9 4.808237645513585E-9 3.408349614578086E-11
i 1.593275916096568E-16 -3.156849952626726E-16 -6.079930034212336E-14 -3.41505842796941E-11 3.408349614578086E-11 1.066764496588117E-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 12.9   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.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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