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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06063145845089064 3.7767e-08  
a 2.535384583798941 7.7121e-09 au
q 2.381660518749307 9.6817e-08 au
i 4.512537670785653 4.1878e-06 deg
node 238.3276068389297 4.7209e-05 deg
peri 354.702794255728 5.9433e-05 deg
M 211.4693146677956 3.8644e-05 deg
tp 2459608.884133146072
(2022-Jan-29.38413315)
0.00015899 TDB
period 1474.565928533412
4.04
6.728e-06
1.842e-08
d
yr
n .2441396434258129 1.1139e-09 deg/d
Q 2.689108648848575 8.1797e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3044  
   data-arc span      44273 days (121.21 yr)  
   first obs. used      1898-11-18  
   last obs. used      2020-02-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41089  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:37:34  

Additional Information
 Earth MOID = 1.37036 au 
 Jupiter MOID = 2.29849 au 
 T_jup = 3.441 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456072.5 (2012-May-25.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06013185106521857 3.762e-08  
q 2.383201744206422 9.6233e-08 au
tp 2456663.262725430609
(2014-Jan-05.76272543)
0.00015802 TDB
node 238.3691116328015 4.7246e-05 deg
peri 355.3677004241745 5.9756e-05 deg
i 4.509747514293446 4.1872e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3044  
   data-arc span      44273 days (121.21 yr)  
   first obs. used      1898-11-18  
   last obs. used      2020-02-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41089  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:37:34  

Additional Information
 Jupiter MOID = 2.29849 au 
 T_jup = 3.441 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.415263364738444E-15 -3.610009873039941E-15 -8.355145655854858E-13 7.828742593777373E-15 -1.974061144540224E-13 -1.550979782390109E-16
q -3.610009873039941E-15 9.260802460711558E-15 2.300309984979679E-12 -2.05128026270098E-14 5.360583633015056E-13 3.736624276408958E-16
tp -8.355145655854858E-13 2.300309984979679E-12 2.496976165699284E-8 9.584140477092178E-12 5.793396995354928E-9 4.546340516032057E-12
node 7.828742593777373E-15 -2.05128026270098E-14 9.584140477092178E-12 2.232225340943954E-9 -2.222604451574324E-9 -2.189409342607311E-11
peri -1.974061144540224E-13 5.360583633015056E-13 5.793396995354928E-9 -2.222604451574324E-9 3.570724934831334E-9 2.285632556389263E-11
i -1.550979782390109E-16 3.736624276408958E-16 4.546340516032057E-12 -2.189409342607311E-11 2.285632556389263E-11 1.753261999512994E-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 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. 2019-August); 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

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Alternate Designations
 A914 WG = 1953 JG = 1957 MG = A898 WA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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