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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0792956137543666 3.601e-08  
a 3.013107216664161 1.6124e-08 au
q 2.774181030611066 1.0831e-07 au
i 9.249906293993853 4.1361e-06 deg
node 233.2824972028864 2.4924e-05 deg
peri 88.51538912642731 3.6474e-05 deg
M 116.99954369299 2.7016e-05 deg
tp 2458379.628145843114
(2018-Sep-18.12814584)		 0.00014338 TDB
period 1910.382386473111
5.23		 1.5335e-05
4.198e-08		 d
yr
n .188443948472861 1.5127e-09 deg/d
Q 3.252033402717257 1.7403e-08 au
   Orbit Determination Parameters
   # obs. used (total)      2542  
   data-arc span      24902 days (68.18 yr)  
   first obs. used      1951-12-01  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41753  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:14:34  

Additional Information
 Earth MOID = 1.78194 au 
 Jupiter MOID = 1.99365 au 
 T_jup = 3.224 
[ 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-August); 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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