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2180 Marjaleena (1940 RJ)
Classification: Main-belt Asteroid          SPK-ID: 2002180
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07912824980514266 3.7917e-08  
a 3.011972225973124 1.6581e-08 au
q 2.773640135270171 1.1523e-07 au
i 9.251401754439446 4.1421e-06 deg
node 233.2826557834135 2.6623e-05 deg
peri 88.25960563240733 3.7711e-05 deg
M 41.87189695233794 2.7105e-05 deg
tp 2458378.427384881827
(2018-Sep-16.92738488)		 0.00014377 TDB
period 1909.303071068017
5.23		 1.5766e-05
4.316e-08		 d
yr
n .1885504744925723 1.557e-09 deg/d
Q 3.250304316676077 1.7893e-08 au
   Orbit Determination Parameters
   # obs. used (total)      2381  
   data-arc span      24806 days (67.92 yr)  
   first obs. used      1951-12-01  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43062  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 02:13:16  

Additional Information
 Earth MOID = 1.7805 au 
 Jupiter MOID = 1.99324 au 
 T_jup = 3.225 
[ show covariance matrix ]

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.0   n/a MPO337265  
diameter diameter 21.357 km 0.167 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 7.396 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Behrend, R. (2014) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.154   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

2180 Marjaleena (1940 RJ)          Discovered 1940-Sep-08 by Alikoski, H. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1940 RJ = 1950 NQ1 = 1970 JL = 1970 JR = 1971 OL1 = 1976 NM = 1977 TT3 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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