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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06094188952244905 3.782e-08  
a 2.534616974108912 7.7651e-09 au
q 2.380152626491043 9.6972e-08 au
i 4.513028382348936 4.1846e-06 deg
node 238.3260511312104 4.7907e-05 deg
peri 354.5736969075672 5.9971e-05 deg
M 113.9275151283777 3.8449e-05 deg
tp 2458134.062928860756
(2018-Jan-15.56292886)
0.00015695 TDB
period 1473.896322770776
4.04
6.7731e-06
1.854e-08
d
yr
n .2442505584946684 1.1224e-09 deg/d
Q 2.689081321726781 8.2383e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2934  
   data-arc span      44210 days (121.04 yr)  
   first obs. used      1898-11-18  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42082  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 20:48:47  

Additional Information
 Earth MOID = 1.36883 au 
 Jupiter MOID = 2.29913 au 
 T_jup = 3.442 
[ 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-January); 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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