797 Montana

797 Montana
Discovery [1]
Discovered by H. Thiele
Discovery site Bergedorf Obs.
Discovery date 17 November 1914
Designations
MPC designation 797 Montana
Named after
 Latin for "mountain village"
(discovering observatory)[2]
1914 VR · 1953 JG
1957 MG · A898 WA
main-belt · (inner) [3]
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 101.11 yr (36,929 days)    
Aphelion 2.6898 AU
Perihelion 2.3797 AU
2.5347 AU
Eccentricity 0.0611
4.04 yr (1,474 days)
179.92°
Inclination 4.5099°
238.35°
355.53°
Physical characteristics
Dimensions 21.91±0.41 km[4]
21.678±0.046 km[5]
25.41 km (calculated)[3]
4.5463±0.0002 h[6]
4.5 h[7]
4.55±0.01 h[8]
4.5462±0.0004 h[6]
4.54619±0.00005 h[9]
0.281±0.012[4]
0.2878±0.0282[5]
0.20 (assumed)[3]
B–V = 0.887
U–B = 0.505
S (Tholen), S (SMASS)[1][3]
10.34[1][3][4][5][10]

    797 Montana, provisional designation 1914 VR, is a stony asteroid from the inner regions of the asteroid belt, about 22 kilometers in diameter. It was discovered by Danish astronomer Holger Thiele at the Bergedorf Observatory in Hamburg, Germany, on 17 November 1914.[11]

    The S-type asteroid orbits the Sun at a distance of 2.4–2.7 AU once every 4.04 years (1,474 days). Its orbit shows an eccentricity of 0.06 and an inclination of 5 degrees from the plane of the ecliptic.[1] Between 2003 and 2007, three of photometric light-curve analysis by amateur astronomers René Roy, Horacio Correia, Laurent Bernasconi, and Richard Ditteon rendered a well-defined rotation period of 4.55 hours with a brightness amplitude between 0.32 and 0.41 in magnitude (U=3).[6][8]

    According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid's surface has an albedo of 0.281–0.288 and its diameter measures between 21.7 and 21.9 kilometers[4][5] while the Collaborative Asteroid Lightcurve Link (CALL) assumes a standard albedo for stony asteroids of 0.20 and calculates a somewhat larger diameter of 25.4 kilometers, as the lower the albedo, the larger the body's diameter at a constant absolute magnitude.[3]

    The minor planet was the first discovery made at Bergedorf Observatory. It was the named Montana, the Latin word for "mountain village" to honor the observatory, which German name literally translates to Montana.[2]

    References

    1. 1 2 3 4 5 "JPL Small-Body Database Browser: 797 Montana (1914 VR)" (2016-02-18 last obs.). Jet Propulsion Laboratory. Retrieved March 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (797) Montana. Springer Berlin Heidelberg. p. 74. ISBN 978-3-540-00238-3. Retrieved March 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (797) Montana". Asteroid Lightcurve Database (LCDB). Retrieved March 2016.
    4. 1 2 3 4 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved March 2016.
    5. 1 2 3 4 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved March 2016.
    6. 1 2 3 Behrend, Raoul. "Asteroids and comets rotation curves – (797) Montana". Geneva Observatory. Retrieved March 2016.
    7. ↑ Angeli, C. A.; Guimarã; es, T. A.; Lazzaro, D.; Duffard, R.; Fernández, S.; et al. (April 2001). "Rotation Periods for Small Main-Belt Asteroids From CCD Photometry". The Astronomical Journal 121 (4): 2245–2252. Bibcode:2001AJ....121.2245A. doi:10.1086/319936. Retrieved March 2016.
    8. 1 2 Ditteon, Richard; Hirsch, Brian; Kirkpatrick, Elaine; Kramb, Stephen; Kropf, Matthew; Meehl, Joshua; et al. (September 2004). "2003-04 winter observing campaign at Rose-Hulman Institute. Results for 797 Montana, 3227 Hasegawa, 3512 Eriepa, 4159 Freeman, 5234 Sechenov, and (5892) 1981 YS1". The Minor Planet Bulletin 31 (3): 54–56. Bibcode:2004MPBu...31...54D. ISSN 1052-8091. Retrieved March 2016.
    9. ↑ Hanus, J.; Durech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M.; et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network". Astronomy and Astrophysics 586: 24. arXiv:1510.07422. Bibcode:2016A&A...586A.108H. doi:10.1051/0004-6361/201527441. Retrieved March 2016.
    10. ↑ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved March 2016.
    11. ↑ "797 Montana (1914 VR)". Minor Planet Center. Retrieved March 2016.

    External links


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