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11 Parthenope (A850 JA)
Classification: Main-belt Asteroid          SPK-ID: 2000011
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 115 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09968200389192709 2.9485e-08  
a 2.452819983680198 2.1969e-09 au
q 2.208317972520792 7.2534e-08 au
i 4.631841668829962 3.3382e-06 deg
node 125.5282048883062 2.4801e-05 deg
peri 195.5061955461264 2.7745e-05 deg
M 123.1905837790154 1.1966e-05 deg
tp 2458916.355505890439
4.6554e-05 TDB
period 1403.126867143608
n .2565698144836069 3.4471e-10 deg/d
Q 2.697321994839605 2.4159e-09 au
  Orbit Determination Parameters
   # obs. used (total)      5706  
   data-arc span      62292 days (170.55 yr)  
   first obs. used      1850-09-17  
   last obs. used      2021-04-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4759  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 14:10:55  

Additional Information
 Earth MOID = 1.19508 au 
 Jupiter MOID = 2.54702 au 
 T_jup = 3.483 
[ 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 6.58   n/a MPCxxxxx IRAS observations used: 11
diameter diameter 142.887 km 1.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 13.7204 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Lang, K.; Hansen, A.T. (1999) Minor Planet Bull. 26, 15-18.]
[Stephens, R.D.; Warner, B.D.; Harris, A.W.; Shepard, M.K. (2008) Bull. Amer. Astron. Soc. 40, #28.16.]
[Pilcher, F. (2010) Minor Planet Bull. 37, 119-122.]
[Behrend, R. (2011) Observatoire de Geneve web site,]
[Pilcher, F. (2011) Minor Planet Bull. 38, 183-185.]
[Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.]
[Hanus, J.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.]
geometric albedo albedo 0.191   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.837   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=11; phase (min.=6.57, mean=18.28, max.=25.56) deg.
U-B UB 0.417   0.035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=10; phase (min.=6.57, mean=17.81, max.=25.56) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Sk   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)

11 Parthenope (A850 JA)          Discovered 1850-May-11 by De Gasparis, A. at Naples
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2021-Sep-25 10:35 UT
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