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154 Bertha (A875 VD)
Classification: Main-belt Asteroid          SPK-ID: 2000154
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07673549211757048 4.6707e-08  
a 3.195094075348134 1.3549e-08 au
q 2.949916959114362 1.4967e-07 au
i 20.9736437841696 5.0929e-06 deg
node 36.72606343515906 1.1699e-05 deg
peri 160.4968294592776 3.1974e-05 deg
M 5.655291860697821 2.9114e-05 deg
tp 2458967.730001306628
(2020-Apr-28.23000131)
0.00016871 TDB
period 2086.046099866222
5.71
1.3269e-05
3.633e-08
d
yr
n .1725752849005048 1.0977e-09 deg/d
Q 3.440271191581907 1.4588e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2632  
   data-arc span      49325 days (135.04 yr)  
   first obs. used      1885-07-17  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41918  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:10:37  

Additional Information
 Earth MOID = 1.95131 au 
 Jupiter MOID = 1.53386 au 
 T_jup = 3.088 
[ show covariance matrix ]

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 7.7   n/a MPO502154 IRAS observations used: 13
diameter diameter 192.611 km 2.189 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 25.224 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Pilcher, F. (2012) Minor Planet Bull. 39, 57-60.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.044   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
SMASSII spectral type spec_B C   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)

154 Bertha (A875 VD)          Discovered 1875-Nov-04 by Henry, Prosper at Paris
In their cooperative program it will probably never be known which of the Henry brothers discovered which planet. With strict impartiality, these discoveries were announced as having been made alternatively by Prosper and by Paul.
Note: "planet" implies "minor planet"
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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