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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 ]

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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 69 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1646256169949826 4.2807e-08  
a 2.436901366536709 4.8581e-09 au
q 2.035724975514687 1.0485e-07 au
i 7.745332233806551 4.7822e-06 deg
node 47.67843564589762 3.2975e-05 deg
peri 33.32877075847338 3.5583e-05 deg
M 53.87046684402991 1.3223e-05 deg
tp 2458792.576492609181
(2019-Nov-05.07649261)
5.1e-05 TDB
period 1389.489771406911
3.80
4.155e-06
1.138e-08
d
yr
n .2590879093953217 7.7476e-10 deg/d
Q 2.838077757558731 5.6579e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3003  
   data-arc span      54140 days (148.23 yr)  
   first obs. used      1872-03-22  
   last obs. used      2020-06-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4278  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:07:22  

Additional Information
 Earth MOID = 1.05598 au 
 Jupiter MOID = 2.42885 au 
 T_jup = 3.473 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455924.5 (2011-Dec-29.0) TDB
Reference: JPL 69 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1639589044270224 4.2654e-08  
q 2.038174830374529 1.0447e-07 au
tp 2456012.082988353722
(2012-Mar-25.58298835)
5.1859e-05 TDB
node 47.72134929701453 3.2983e-05 deg
peri 33.12772069531911 3.5633e-05 deg
i 7.744517712817952 4.7798e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3003  
   data-arc span      54140 days (148.23 yr)  
   first obs. used      1872-03-22  
   last obs. used      2020-06-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4278  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:07:22  

Additional Information
 Jupiter MOID = 2.42885 au 
 T_jup = 3.473 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.819360847381205E-15 -4.452574508957139E-15 -6.509285463482756E-15 -1.024546497062464E-15 -8.315579657364671E-15 -8.038629319253445E-16
q -4.452574508957139E-15 1.091309922788462E-14 -4.560563109989821E-15 9.010933708474155E-16 1.544093422706409E-14 2.214363593736189E-15
tp -6.509285463482756E-15 -4.560563109989821E-15 2.689407305072603E-9 2.800809660652276E-12 7.170407223796859E-10 6.769230310235039E-13
node -1.024546497062464E-15 9.010933708474155E-16 2.800809660652276E-12 1.087898996707177E-9 -1.076614828370019E-9 4.093057294573693E-12
peri -8.315579657364671E-15 1.544093422706409E-14 7.170407223796859E-10 -1.076614828370019E-9 1.269742287180793E-9 -3.934014938106183E-12
i -8.038629319253445E-16 2.214363593736189E-15 6.769230310235039E-13 4.093057294573693E-12 -3.934014938106183E-12 2.284686364315064E-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. 2019-August); 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.]
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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