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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 ]

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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 79 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1646702691772946 1.6367e-08  
a 2.436210756806112 4.2234e-09 au
q 2.03503927571023 4.0206e-08 au
i 7.746208657368033 4.118e-07 deg
node 47.67365305294721 1.6207e-06 deg
peri 33.22246970686334 4.7407e-06 deg
M 156.6137940090359 2.9633e-06 deg
tp 2458792.275652557150
(2019-Nov-04.77565256)
1.1097e-05 TDB
period 1388.899148097237
3.80
3.6117e-06
9.888e-09
d
yr
n .2591980853996438 6.7401e-10 deg/d
Q 2.837382237901995 4.9188e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3535  
   data-arc span      54561 days (149.38 yr)  
   first obs. used      1872-03-22  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40702  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 06:13:30  

Additional Information
 Earth MOID = 1.05513 au 
 Jupiter MOID = 2.43059 au 
 T_jup = 3.473 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457337.5 (2015-Nov-11.0) TDB
Reference: JPL 79 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1630741929211777 1.6392e-08  
q 2.039766817460858 4.0241e-08 au
tp 2457402.770609454025
(2016-Jan-15.27060945)
1.1419e-05 TDB
node 47.70475746683848 1.6223e-06 deg
peri 33.33593817811269 4.793e-06 deg
i 7.742688928072547 4.1144e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3535  
   data-arc span      54561 days (149.38 yr)  
   first obs. used      1872-03-22  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40702  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 06:13:30  

Additional Information
 Jupiter MOID = 2.43059 au 
 T_jup = 3.473 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.68699634066505E-16 -6.570681118116758E-16 8.828999516211748E-14 -7.465546292914854E-15 4.687287109151399E-14 -1.834232645771303E-15
q -6.570681118116758E-16 1.619324563160131E-15 -2.224377643970874E-13 1.824527425582014E-14 -1.171643273423279E-13 4.532810748800532E-15
tp 8.828999516211748E-14 -2.224377643970874E-13 1.303934078682133E-10 -6.398443406269033E-12 5.180055574878963E-11 -1.326466064789964E-12
node -7.465546292914854E-15 1.824527425582014E-14 -6.398443406269033E-12 2.632002029358928E-12 -4.463905008983424E-12 1.179918021656971E-13
peri 4.687287109151399E-14 -1.171643273423279E-13 5.180055574878963E-11 -4.463905008983424E-12 2.29725152654618E-11 -6.811848004988949E-13
i -1.834232645771303E-15 4.532810748800532E-15 -1.326466064789964E-12 1.179918021656971E-13 -6.811848004988949E-13 1.69286674184972E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.93   n/a MPO636061 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
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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