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234 Barbara (A883 PA)
Classification: Main-belt Asteroid          SPK-ID: 2000234
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 84 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2450520930438709 3.5217e-08  
a 2.385335770982288 5.4544e-09 au
q 1.800804247690663 8.4748e-08 au
i 15.37567411710235 4.036e-06 deg
node 144.5041019705316 1.4018e-05 deg
peri 192.1852323794545 1.5844e-05 deg
M 31.70881336469736 9.3494e-06 deg
tp 2458881.977665415700
(2020-Feb-02.47766542)		 3.4713e-05 TDB
period 1345.620851830806
3.68		 4.6154e-06
1.264e-08		 d
yr
n .2675344986741221 9.1763e-10 deg/d
Q 2.969867294273913 6.791e-09 au
   Orbit Determination Parameters
   # obs. used (total)      4633  
   data-arc span      50092 days (137.14 yr)  
   first obs. used      1883-09-24  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38488  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:52:00  

Additional Information
 Earth MOID = .793029 au 
 Jupiter MOID = 2.41983 au 
 T_jup = 3.447 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455833.5 (2011-Sep-29.0) TDB
Reference: JPL 84 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2438302790690739 3.5014e-08  
q 1.804801772524599 8.4179e-08 au
tp 2456190.287821941316
(2012-Sep-19.78782194)		 3.09e-05 TDB
node 144.6173215915279 1.4047e-05 deg
peri 192.1559997487313 1.5908e-05 deg
i 15.35298455230625 4.0309e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      4633  
   data-arc span      50092 days (137.14 yr)  
   first obs. used      1883-09-24  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38488  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:52:00  

Additional Information
 Jupiter MOID = 2.41983 au 
 T_jup = 3.447 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.225946539017719E-15 -2.943894395824413E-15 -6.213352728614421E-14 6.527167066063573E-15 -2.147675354726893E-14 2.416388311068419E-16
q -2.943894395824413E-15 7.086042465782323E-15 1.903244787296664E-13 -1.596042014706673E-14 5.926546055360193E-14 -4.597846252604963E-16
tp -6.213352728614421E-14 1.903244787296664E-13 9.548067392632458E-10 -4.275825221325392E-12 2.434174511440499E-10 9.99959931277891E-13
node 6.527167066063573E-15 -1.596042014706673E-14 -4.275825221325392E-12 1.97318666045908E-10 -1.908507991492523E-10 1.502464842471926E-13
peri -2.147675354726893E-14 5.926546055360193E-14 2.434174511440499E-10 -1.908507991492523E-10 2.530490674079375E-10 7.993135157405399E-14
i 2.416388311068419E-16 -4.597846252604963E-16 9.99959931277891E-13 1.502464842471926E-13 7.993135157405399E-14 1.624840855484059E-11

[ 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 9.1   n/a MPO492751 IRAS observations used: 11
diameter diameter 45.476 km 0.245 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 26.4744 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Schober, H.J. (1981) Astron. Astrophys. 96, 302-305.]
[Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hamanowa, H.; Hamanowa, H. (2011) http://www2.ocn.ne.jp/~hamaten/astlcdata.htm]
[Pilcher, F. (2014) Minor Planet Bull. 41, 155-156.]
[Tanga, P.; Carry, B.; Colars, F.; Delbo, M.; et al. (2015) arXiv:1502.00460v1.]
[Franco, L.; Marchini, A.; Baj, G.; Papini, R.; et al. (2019) Minor Planet Bull. 46, 441-443.]
geometric albedo albedo 0.205   0.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.897   0.037 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=.76, mean=10.85, max.=15.90) deg.
U-B UB 0.488   0.028 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=.76, mean=10.85, max.=15.90) 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 Ld   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)

234 Barbara (A883 PA)          Discovered 1883-Aug-12 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A883 PA = 1942 RL1 = 1953 RE = 1975 XP 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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