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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 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1620854852451555 8.9524e-09  
a 2.636849367316791 7.7124e-09 au
q 2.209454358096867 2.2835e-08 au
i 32.8928590698461 6.897e-07 deg
node 318.2839162310399 1.4137e-06 deg
peri 162.0608213430222 4.4338e-06 deg
M 169.1369434288502 4.0886e-06 deg
tp 2458661.711440982090
(2019-Jun-27.21144098)
1.5746e-05 TDB
period 1563.962762267389
4.28
6.8615e-06
1.879e-08
d
yr
n .2301845086631616 1.0099e-09 deg/d
Q 3.064244376536714 8.9624e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2309  
   data-arc span      36692 days (100.46 yr)  
   first obs. used      1921-02-23  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .35115  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 07:10:49  

Additional Information
 Earth MOID = 1.23402 au 
 Jupiter MOID = 2.0144 au 
 T_jup = 3.153 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456727.5 (2014-Mar-11.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1632883343027259 8.9165e-09  
q 2.20451872002103 2.2667e-08 au
tp 2457100.938609971704
(2015-Mar-19.43860997)
1.3117e-05 TDB
node 318.3063693217543 1.4137e-06 deg
peri 162.3141745454954 4.4129e-06 deg
i 32.90049943253141 6.8968e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2309  
   data-arc span      36692 days (100.46 yr)  
   first obs. used      1921-02-23  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .35115  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 07:10:49  

Additional Information
 Jupiter MOID = 2.0144 au 
 T_jup = 3.153 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.950476482506899E-17 -1.941046760107827E-16 -7.28384159556056E-14 3.459608113711964E-15 -2.528276201015841E-14 -1.955142666568708E-15
q -1.941046760107827E-16 5.137924591241923E-16 2.028763628087401E-13 -9.323522940236994E-15 6.999537955919796E-14 5.181785469600762E-15
tp -7.28384159556056E-14 2.028763628087401E-13 1.720493553192218E-10 -1.274244082163674E-11 5.723283165014211E-11 8.537525692053541E-13
node 3.459608113711964E-15 -9.323522940236994E-15 -1.274244082163674E-11 1.99854253190687E-12 -4.698160549054253E-12 1.183462712587511E-13
peri -2.528276201015841E-14 6.999537955919796E-14 5.723283165014211E-11 -4.698160549054253E-12 1.947352772450954E-11 3.018601808787167E-13
i -1.955142666568708E-15 5.181785469600762E-15 8.537525692053541E-13 1.183462712587511E-13 3.018601808787167E-13 4.756556354849999E-13

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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