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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 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07929561812867721 3.5525e-08  
a 3.013107214477866 1.5665e-08 au
q 2.774181015417867 1.0634e-07 au
i 9.249906258361403 4.0024e-06 deg
node 233.282496209254 2.418e-05 deg
peri 88.51539244138527 3.5327e-05 deg
M 116.999542121625 2.6416e-05 deg
tp 2458379.628154857499
(2018-Sep-18.12815486)
0.00013998 TDB
period 1910.382384393864
5.23
1.4898e-05
4.079e-08
d
yr
n .188443948677962 1.4695e-09 deg/d
Q 3.252033413537865 1.6907e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2772  
   data-arc span      25188 days (68.96 yr)  
   first obs. used      1951-12-01  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40705  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:04:50  

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 7.717 h n/a LCDB (Rev. 2020-October); 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.]
[Polakis, T. (2020) Minor Planet Bull. 47, 94-101.]
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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