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271 Penthesilea (A887 TB)
Classification: Main-belt Asteroid          SPK-ID: 2000271
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 56 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1043535415863178 9.3039e-09  
a 3.002562723472372 1.0119e-08 au
q 2.689234669442971 3.2568e-08 au
i 3.539840925598964 3.4565e-07 deg
node 335.3506033589748 3.0887e-06 deg
peri 57.65049332701601 1.2111e-05 deg
M 224.5977671933477 1.3785e-05 deg
tp 2460111.259415415214
(2023-Jun-15.75941542)
7.4697e-05 TDB
period 1900.362971982212
5.20
9.6063e-06
2.63e-08
d
yr
n .1894374944721716 9.576e-10 deg/d
Q 3.315890777501774 1.1175e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3385  
   data-arc span      45266 days (123.93 yr)  
   first obs. used      1897-09-02  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4541  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 06:25:39  

Additional Information
 Earth MOID = 1.69652 au 
 Jupiter MOID = 2.11471 au 
 T_jup = 3.241 
[ 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 9.90   n/a MPO614063 IRAS observations used: 13
diameter diameter 65.901 km 0.176 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 18.787 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Pilcher, F. (2009) Minor Planet Bull. 36, 100-102.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.045   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.724   0.045 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=2.11, mean=5.30, max.=10.93) deg.
U-B UB 0.348   0.052 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=2.11, mean=5.30, max.=10.93) deg.
Tholen spectral type spec_T PC   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices; used ground-based radiometric albedo

271 Penthesilea (A887 TB)          Discovered 1887-Oct-13 by Knorre, V. at Berlin
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A887 TB = A916 GG = A916 HA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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