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JPL Small-Body Database Browser
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869 Mellena (A917 JB)
Classification: Main-belt Asteroid          SPK-ID: 2000869
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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2205695143390918 3.3211e-08  
a 2.690017959295747 8.7274e-09 au
q 2.09668200445045 8.9864e-08 au
i 7.836893107143748 4.6991e-06 deg
node 154.890644573391 2.7915e-05 deg
peri 107.1549457847615 2.9795e-05 deg
M .8952250932905721 1.0331e-05 deg
tp 2458596.492616161682
(2019-Apr-22.99261616)
4.6243e-05 TDB
period 1611.503288510039
4.41
7.8425e-06
2.147e-08
d
yr
n .2233938972180741 1.0872e-09 deg/d
Q 3.283353914141045 1.0652e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2445  
   data-arc span      37429 days (102.48 yr)  
   first obs. used      1917-05-10  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44435  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 01:58:32  

Additional Information
 Earth MOID = 1.09709 au 
 Jupiter MOID = 1.86612 au 
 T_jup = 3.324 
[ 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 11.9   n/a MPO448919  
diameter diameter 21.193 km 0.090 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 6.5155 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Stephens, R.D. (2010) Minor Planet Bull. 37, 159-161.]
[Carbognani, A. (2011) Minor Planet Bull. 38, 57-63.]
[Ferrero, A. (2011) Entry on CALL web site. http://www.minorplanet.info/call.html]
[Owings, L.E. (2011) Minor Planet Bull. 38, 9-10.]
geometric albedo albedo 0.065   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

869 Mellena (A917 JB)          Discovered 1917-May-09 by Schorr, R. at Bergedorf
Independent discovery May 10 by M. Wolf, Heidelberg, was announced first.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A917 JB = 1931 RC = 1944 OB = 1952 DL2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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