Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
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 ]

[ hide orbit diagram ]

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 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1617994970984737 1.6596e-08  
a 2.229200347763305 5.7173e-09 au
q 1.868516852563459 3.8573e-08 au
i 2.946492751348649 1.961e-07 deg
node 216.7394279919832 5.9461e-06 deg
peri 160.161022142751 9.4678e-06 deg
M 163.7612030080105 6.3181e-06 deg
tp 2458647.493037335194
(2019-Jun-12.99303734)
2.0605e-05 TDB
period 1215.687860754125
3.33
4.6769e-06
1.28e-08
d
yr
n .296128645865298 1.1392e-09 deg/d
Q 2.58988384296315 6.6424e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2600  
   data-arc span      33346 days (91.30 yr)  
   first obs. used      1929-11-27  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46788  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 14:19:29  

Additional Information
 Earth MOID = .869043 au 
 Jupiter MOID = 2.87516 au 
 T_jup = 3.624 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456630.5 (2013-Dec-04.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1622841332446615 1.6618e-08  
q 1.86730872032111 3.8636e-08 au
tp 2456214.952751935021
(2012-Oct-14.45275193)
1.9701e-05 TDB
node 216.7832076417689 5.9499e-06 deg
peri 159.9017866561834 9.4393e-06 deg
i 2.944551411525841 1.9595e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2600  
   data-arc span      33346 days (91.30 yr)  
   first obs. used      1929-11-27  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46788  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 14:19:29  

Additional Information
 Jupiter MOID = 2.87516 au 
 T_jup = 3.624 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.761489365565034E-16 -6.375103632358437E-16 -2.108279119010514E-14 -6.745020879014037E-15 2.428767175967027E-14 -2.127801597174391E-16
q -6.375103632358437E-16 1.492736176005187E-15 3.227084221223536E-14 1.488195357976444E-14 -5.540725717957765E-14 4.959795930125845E-16
tp -2.108279119010514E-14 3.227084221223536E-14 3.881254796078742E-10 -1.768471270174818E-11 1.375512287297597E-10 2.034454343186149E-13
node -6.745020879014037E-15 1.488195357976444E-14 -1.768471270174818E-11 3.540171446651938E-11 -4.187000245175727E-11 6.120355407096947E-13
peri 2.428767175967027E-14 -5.540725717957765E-14 1.375512287297597E-10 -4.187000245175727E-11 8.91004069955754E-11 -5.600473470136504E-13
i -2.127801597174391E-16 4.959795930125845E-16 2.034454343186149E-13 6.120355407096947E-13 -5.600473470136504E-13 3.839667707000395E-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 12.97   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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-18 14:50 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin