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945 Barcelona (A921 CB)
Classification: Main-belt Asteroid          SPK-ID: 2000945
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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1620854857566728 9.0062e-09  
a 2.636849367749913 7.758e-09 au
q 2.209454357110993 2.2913e-08 au
i 32.8928590712859 6.9015e-07 deg
node 318.2839162978138 1.4168e-06 deg
peri 162.0608210862317 4.4501e-06 deg
M 169.1369434700492 4.0899e-06 deg
tp 2458661.711440622065
(2019-Jun-27.21144062)
1.5754e-05 TDB
period 1563.962762652729
4.28
6.9021e-06
1.89e-08
d
yr
n .2301845086064472 1.0159e-09 deg/d
Q 3.064244378388834 9.0155e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2254  
   data-arc span      36646 days (100.33 yr)  
   first obs. used      1921-02-23  
   last obs. used      2021-06-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .35469  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 11:45:33  

Additional Information
 Earth MOID = 1.23402 au 
 Jupiter MOID = 2.0144 au 
 T_jup = 3.153 
[ 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 10.10   n/a MPO614063 IRAS observations used: 4
diameter diameter 25.618 km 0.949 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 7.36 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J.W. (1989) Icarus 81, 314-364.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.239   0.040 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.809   0.022 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=1.32 deg.
U-B UB 0.389   0.038 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=1.32 deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
SMASSII spectral type spec_B Sq   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

945 Barcelona (A921 CB)          Discovered 1921-Feb-03 by Comas Sola, J. at Barcelona
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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