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969 Leocadia (A921 VC)
Classification: Main-belt Asteroid          SPK-ID: 2000969
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2063166104872286 4.7808e-08  
a 2.461514524057855 8.4724e-09 au
q 1.953663190789155 1.1456e-07 au
i 2.292751523045902 3.027e-06 deg
node 287.7594669310569 0.00010081 deg
peri 91.3318944280372 0.00010129 deg
M 199.5343181509195 1.4736e-05 deg
tp 2459629.255353617120
(2022-Feb-18.75535362)
6.043e-05 TDB
period 1410.593995512693
3.86
7.2828e-06
1.994e-08
d
yr
n .2552116350595656 1.3176e-09 deg/d
Q 2.969365857326555 1.022e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2668  
   data-arc span      35998 days (98.56 yr)  
   first obs. used      1921-11-25  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43722  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:23:56  

Additional Information
 Earth MOID = .95752 au 
 Jupiter MOID = 2.50331 au 
 T_jup = 3.459 
[ 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 12.8   n/a MPO492761 IRAS observations used: 6
diameter diameter 17.321 km 0.218 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 6.87 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]
geometric albedo albedo 0.019   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.621   0.010 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=5.79, mean=6.12, max.=6.53) deg.
U-B UB 0.227   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=5.79, mean=6.12, max.=6.53) deg.
Tholen spectral type spec_T FXU:   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices

969 Leocadia (A921 VC)          Discovered 1921-Nov-05 by Belyavskij, S. at Simeis
Independent discovery Nov. 25 by K. Reinmuth, Heidelberg, was announced first.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A921 VC = 1940 RV = 1944 SB = 1948 UG = 1963 PA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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