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118 Peitho (A872 EA)
Classification: Main-belt Asteroid          SPK-ID: 2000118
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 70 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .164625618066277 4.2751e-08  
a 2.436901366529591 4.8553e-09 au
q 2.035724972898102 1.0471e-07 au
i 7.745332208047701 4.7761e-06 deg
node 47.67843559298364 3.297e-05 deg
peri 33.32877075962256 3.5578e-05 deg
M 53.87046697004635 1.3219e-05 deg
tp 2458792.576492123708
(2019-Nov-05.07649212)		 5.0987e-05 TDB
period 1389.489771400823
3.80		 4.1526e-06
1.137e-08		 d
yr
n .2590879093964569 7.7431e-10 deg/d
Q 2.83807776016108 5.6546e-09 au
   Orbit Determination Parameters
   # obs. used (total)      3019  
   data-arc span      54148 days (148.25 yr)  
   first obs. used      1872-03-22  
   last obs. used      2020-06-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42689  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:33:13  

Additional Information
 Earth MOID = 1.05598 au 
 Jupiter MOID = 2.42885 au 
 T_jup = 3.473 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455936.5 (2012-Jan-10.0) TDB
Reference: JPL 70 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1639347929749727 4.2603e-08  
q 2.038187702131877 1.0432e-07 au
tp 2456012.075327770799
(2012-Mar-25.57532777)		 5.1855e-05 TDB
node 47.72134589895715 3.2978e-05 deg
peri 33.12450136817161 3.5628e-05 deg
i 7.744510888424048 4.7738e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      3019  
   data-arc span      54148 days (148.25 yr)  
   first obs. used      1872-03-22  
   last obs. used      2020-06-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42689  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:33:13  

Additional Information
 Jupiter MOID = 2.42885 au 
 T_jup = 3.473 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.815053206726102E-15 -4.441259213041196E-15 -4.499317616103151E-15 -1.038683305339842E-15 -8.038119344188197E-15 -7.861156169281022E-16
q -4.441259213041196E-15 1.088349796986816E-14 -9.193163149834872E-15 9.325333866414612E-16 1.48190318043963E-14 2.169581863838038E-15
tp -4.499317616103151E-15 -9.193163149834872E-15 2.688930556753773E-9 2.832989564039758E-12 7.169984340256725E-10 6.801145363655059E-13
node -1.038683305339842E-15 9.325333866414612E-16 2.832989564039758E-12 1.087532411900584E-9 -1.076244187771663E-9 3.951385000602772E-12
peri -8.038119344188197E-15 1.48190318043963E-14 7.169984340256725E-10 -1.076244187771663E-9 1.269384071246389E-9 -3.791975197146988E-12
i -7.861156169281022E-16 2.169581863838038E-15 6.801145363655059E-13 3.951385000602772E-12 -3.791975197146988E-12 2.278879494471849E-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 8.9   n/a MPO502153 IRAS observations used: 32
diameter diameter 40.211 km 0.491 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 7.8055 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Stanzel, R.; Schober, H.J. (1980) Astron. Astrophys. Suppl. Ser. 39, 3-5.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Warner, B.D. (2009) Minor Planet Bull. 36, 172-176.]
[Behrend, R. (2013) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2015) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pilcher, F. (2017) Minor Planet Bull. 44, 294-297.]
[Behrend, R. (2019) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Franco, L.; Pilcher, F.; Warner, B.D.; Marcini, A.; et al. (2020) Minor Planet Bull. 47, 169-171.]
[Franco, L.; Marchini, A.; Saya, L.-F.; Galli, G.; et al. (2020) Minor Planet Bull. 47, 242-246.]
[Pilcher, F. (2020) Minor Planet Bull. 47, 192-195.]
geometric albedo albedo 0.245   0.025 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.859   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=3.42, mean=8.57, max.=13.72) deg.
U-B UB 0.433   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=3.42, mean=8.57, max.=13.72) 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 S   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)

118 Peitho (A872 EA)          Discovered 1872-Mar-15 by Luther, R. at Dusseldorf
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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