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797 Montana (A914 WG)
Classification: Main-belt Asteroid          SPK-ID: 2000797
[ 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.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06063153052000547 1.166e-08  
a 2.535384572567188 7.143e-09 au
q 2.381660325475629 3.0105e-08 au
i 4.512540761802658 1.8481e-07 deg
node 238.32754227 3.9274e-06 deg
peri 354.7029443466577 7.2239e-06 deg
M 211.4692351860151 8.2833e-06 deg
tp 2459608.884454662040
(2022-Jan-29.38445466)		 3.5489e-05 TDB
period 1474.565918734922
4.04		 6.2315e-06
1.706e-08		 d
yr
n .2441396450481208 1.0317e-09 deg/d
Q 2.689108819658746 7.5761e-09 au
   Orbit Determination Parameters
   # obs. used (total)      3402  
   data-arc span      9173 days (25.11 yr)  
   first obs. used      1995-11-15  
   last obs. used      2020-12-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39286  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2020-Dec-30 09:36:26  

Additional Information
 Earth MOID = 1.37036 au 
 Jupiter MOID = 2.29849 au 
 T_jup = 3.441 
[ hide covariance matrix ]
Orbital Elements at Epoch 2459247.5 (2021-Feb-02.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06046308529021352 1.1657e-08  
q 2.382256125613011 3.0091e-08 au
tp 2459609.073241426582
(2022-Jan-29.57324143)		 3.5541e-05 TDB
node 238.31961653671 3.9281e-06 deg
peri 354.7265724375006 7.2321e-06 deg
i 4.512000997146731 1.8479e-07 deg
   Orbit Determination Parameters
   # obs. used (total)      3402  
   data-arc span      9173 days (25.11 yr)  
   first obs. used      1995-11-15  
   last obs. used      2020-12-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39286  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2020-Dec-30 09:36:26  

Additional Information
 Jupiter MOID = 2.29849 au 
 T_jup = 3.441 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.35895903180547E-16 -3.418755349784787E-16 2.869231972300226E-13 -2.321241411914085E-15 5.985229263164361E-14 1.006477147080768E-16
q -3.418755349784787E-16 9.05442874425193E-16 -5.762062418157159E-13 5.589799621295903E-15 -1.328542502256348E-13 -2.616841886577875E-16
tp 2.869231972300226E-13 -5.762062418157159E-13 1.263161327266327E-9 8.32827575226204E-12 2.133980961829263E-10 -5.436869696943874E-13
node -2.321241411914085E-15 5.589799621295903E-15 8.32827575226204E-12 1.542975116666501E-11 -1.315687355327018E-11 -1.83785210320379E-14
peri 5.985229263164361E-14 -1.328542502256348E-13 2.133980961829263E-10 -1.315687355327018E-11 5.230275877347911E-11 -1.005030281100025E-13
i 1.006477147080768E-16 -2.616841886577875E-16 -5.436869696943874E-13 -1.83785210320379E-14 -1.005030281100025E-13 3.414846227751025E-14

[ 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 10.4   n/a MPO502160  
diameter diameter 21.197 km 0.208 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 4.5463 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Angeli, C.A.; Guimaraes, T.A.; Lazzaro, D.; Duffard, R.; et al. (2001) Astron. J. 121, 2245-2252.]
[Ditteon, R.; Hirsch, B.; Kirkpatrick, E.; Kramb, S.; et al. (2004) Minor Planet Bull. 31, 54-56.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.287   0.045 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.887   0.016 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=6.85, mean=7.47, max.=8.08) deg.
U-B UB 0.505   0.066 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=6.85, mean=7.47, max.=8.08) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 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)

797 Montana (A914 WG)          Discovered 1914-Nov-17 by Thiele, H. at Bergedorf
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A914 WG = 1953 JG = 1957 MG = A898 WA 
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