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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07929854450681073 3.5515e-08  
a 3.013461994556218 1.4972e-08 au
q 2.774498844461319 1.0613e-07 au
i 9.24881723667357 3.6546e-06 deg
node 233.2746596934871 2.3879e-05 deg
peri 88.64814699152318 3.3775e-05 deg
M 154.5439073364211 2.517e-05 deg
tp 2458380.249710622361
(2018-Sep-18.74971062)
0.00013264 TDB
period 1910.719802969287
5.23
1.424e-05
3.899e-08
d
yr
n .1884106709108026 1.4041e-09 deg/d
Q 3.252425144651117 1.6159e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2997  
   data-arc span      25257 days (69.15 yr)  
   first obs. used      1951-12-01  
   last obs. used      2021-01-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .3949  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:00:59  

Additional Information
 Earth MOID = 1.78038 au 
 Jupiter MOID = 1.99284 au 
 T_jup = 3.224 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457314.5 (2015-Oct-19.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08131552516331922 3.5904e-08  
q 2.767330131422181 1.0757e-07 au
tp 2456459.011670517030
(2013-Jun-15.51167052)
0.00012664 TDB
node 233.4836477382098 2.397e-05 deg
peri 86.48983729336479 3.3204e-05 deg
i 9.229126884993725 3.6499e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2997  
   data-arc span      25257 days (69.15 yr)  
   first obs. used      1951-12-01  
   last obs. used      2021-01-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .3949  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:00:59  

Additional Information
 Jupiter MOID = 1.99284 au 
 T_jup = 3.224 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.289118276164473E-15 -3.830923940852912E-15 2.25581158821012E-13 -2.252888079027467E-15 2.585965508990418E-14 4.195196315275858E-16
q -3.830923940852912E-15 1.157039968159071E-14 -5.586532144704411E-13 8.252047726553217E-15 -4.380541710752212E-14 -9.927164715399294E-16
tp 2.25581158821012E-13 -5.586532144704411E-13 1.603870657391845E-8 1.188008657407187E-11 2.927986032138591E-9 1.295244438965744E-12
node -2.252888079027467E-15 8.252047726553217E-15 1.188008657407187E-11 5.745388002602488E-10 -5.647330426027874E-10 4.416197014961978E-12
peri 2.585965508990418E-14 -4.380541710752212E-14 2.927986032138591E-9 -5.647330426027874E-10 1.102514981481868E-9 -4.181835640618543E-12
i 4.195196315275858E-16 -9.927164715399294E-16 1.295244438965744E-12 4.416197014961978E-12 -4.181835640618543E-12 1.332145044471857E-11

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 11.14   n/a E2021B10  
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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