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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0792956180723081 3.5535e-08  
a 3.013107214546782 1.5803e-08 au
q 2.774181015651164 1.0644e-07 au
i 9.249906008877486 4.0567e-06 deg
node 233.2824970188175 2.4277e-05 deg
peri 88.51539140765655 3.5649e-05 deg
M 116.9995423239374 2.6663e-05 deg
tp 2458379.628153762603
(2018-Sep-18.12815376)
0.00014138 TDB
period 1910.382384459406
5.23
1.5029e-05
4.115e-08
d
yr
n .1884439486714968 1.4825e-09 deg/d
Q 3.2520334134424 1.7056e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2745  
   data-arc span      25172 days (68.92 yr)  
   first obs. used      1951-12-01  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40874  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:11:54  

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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1941-Nov-02 07:43 00:02 Jupiter 1.98619572505505 1.98619536909403 1.98619608101629 4.24159227135232 4.13983038089252 2430300.821670266 1.64392964639658 112.2870482612 15.421294670134 86.4570310449394 4064731.00656764 T 39 CATAB v2.0f-lin.ifort 2020-Nov-13 04:12:01 2020-Nov-13 04:12

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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