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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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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet 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. For accurate long-term ephemerides, please instead use our Horizons system.

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Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


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 
[ show covariance matrix ]

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

[ show close-approach data ]
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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