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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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06063145872114991 3.7417e-08  
a 2.535384583729549 7.6204e-09 au
q 2.381660517998911 9.6051e-08 au
i 4.512537571114019 4.1406e-06 deg
node 238.3276080088927 4.6507e-05 deg
peri 354.7027932023084 5.8796e-05 deg
M 211.4693145947387 3.8554e-05 deg
tp 2459608.884133420338
(2022-Jan-29.38413342)
0.00015863 TDB
period 1474.565928472876
4.04
6.648e-06
1.82e-08
d
yr
n .2441396434358358 1.1007e-09 deg/d
Q 2.689108649460187 8.0824e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3246  
   data-arc span      44542 days (121.95 yr)  
   first obs. used      1898-11-18  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40068  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:25:40  

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

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1908-Mar-07 14:33 < 00:01 Iris 0.0485000023624726 0.0484962086528227 0.0485037966465684 5.48740350421626 5.48740348261573 2418008.106416753 0.704712703298786 329.367961195499 41.2787202091983 -55.6052232633266 145526.806665778 T 31 CATAB v2.0f-lin.ifort 2020-Nov-13 04:25:49 2020-Nov-13 04:25
2150-Jul-07 03:07 < 00:01 Juno 0.0347964110776194 0.0347911976646364 0.0348016266315035 7.20762716874666 7.20762712023801 2506518.629679008 0.378400739595806 506.411413074997 36.579066504723 59.3658684547927 122518.815575436 T 31 CATAB v2.0f-lin.ifort 2020-Nov-13 04:25:49 2020-Nov-13 04:25
2168-Mar-05 13:28 00:01 Iris 0.0455661849235884 0.0455560646962564 0.0455763055881011 5.05839946881804 5.05839944387684 2512970.061132933 1.48472542715419 551.593090014672 38.6574797665987 23.9177075907733 72349.9772359552 T 31 CATAB v2.0f-lin.ifort 2020-Nov-13 04:25:49 2020-Nov-13 04:25

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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