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JPL Small-Body Database Browser
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205 Martha
Classification: Main-belt Asteroid          SPK-ID: 2000205
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 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03636853601673432 3.592e-08  
a 2.776959743353597 1.0465e-08 au
q 2.67596578291042 9.9145e-08 au
i 10.69526393259785 4.0085e-06 deg
node 211.7781015206399 2.1733e-05 deg
peri 176.3287020316912 6.0653e-05 deg
M 137.4620842650206 5.6229e-05 deg
tp 2458355.093660911409
0.00026406 TDB
period 1690.257232124748
n .2129853333314598 1.2039e-09 deg/d
Q 2.877953703796773 1.0845e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2798  
   data-arc span      51247 days (140.31 yr)  
   first obs. used      1879-10-13  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42275  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:20:41  

Additional Information
 Earth MOID = 1.68075 au 
 Jupiter MOID = 2.28931 au 
 T_jup = 3.309 
[ 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 9.5   n/a MPO502154 IRAS observations used: 18
diameter diameter 76.983 km 0.601 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 14.911 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Stephens, R.D.; Warner, B.D. (2012) Minor Planet Bull. 39, 233-234.]
[Pilcher, F. (2014) Minor Planet Bull. 41, 47-49.]
[Durech, J.; Hanus, J. (2018) Astron. Astrophys. 620, A91.]
geometric albedo albedo 0.061   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.688   0.022 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=9.90 deg.
U-B UB 0.350   0.044 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=9.90 deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Ch   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)

205 Martha          Discovered 1879-Oct-13 by Palisa, J. at Pola
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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