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879 Ricarda (A917 OB)
Classification: Main-belt Asteroid          SPK-ID: 2000879
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ 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 .1549243560714489 5.5951e-08  
a 2.531265543559447 7.3944e-09 au
q 2.139110859177654 1.4185e-07 au
i 13.6811820289007 3.3965e-06 deg
node 269.8562932730186 1.9694e-05 deg
peri 96.9448025678337 2.225e-05 deg
M 149.5353042781988 1.1541e-05 deg
tp 2458389.492943417691
(2018-Sep-27.99294342)
4.6215e-05 TDB
period 1470.973971206213
4.03
6.4456e-06
1.765e-08
d
yr
n .2447358056953221 1.0724e-09 deg/d
Q 2.92342022794124 8.54e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2844  
   data-arc span      37591 days (102.92 yr)  
   first obs. used      1917-07-22  
   last obs. used      2020-06-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .35706  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:24:47  

Additional Information
 Earth MOID = 1.18963 au 
 Jupiter MOID = 2.67309 au 
 T_jup = 3.395 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.0   n/a MPO347520  
diameter diameter 18.312 km 0.623 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 82.9 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. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Kim, M.-J.; Choi, Y.-J.; Moon, H.-K.; Byun, Y.-I.; et al. (2014) Astron. J. 147, A56.]
geometric albedo albedo 0.230   0.041 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

879 Ricarda (A917 OB)          Discovered 1917-Jul-22 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A917 OB = 1929 ND = 1933 OR = 1937 NX = 1949 MU = 1957 MC 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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