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词条 797 Montana
释义

  1. Classification and orbit

  2. Physical characteristics

      Rotation period    Diameter and albedo  

  3. Naming

  4. References

  5. External links

{{Infobox planet
| minorplanet = yes
| name = 797 Montana
| background = #D6D6D6
| image =
| caption =
| discovery_ref =  
| discovered = 17 November 1914
| discoverer = H. Thiele
| discovery_site = Bergedorf Obs.
| mpc_name = (797) Montana
| alt_names = 1914 VR{{·}}1953 JG
1957 MG{{·}}A898 WA
| named_after = Bergedorf Observatory
{{small|Latin for "mountain village"}}[2]
| mp_category = main-belt{{·}}{{small|(middle)}}
| orbit_ref =  
| epoch = 16 February 2017 (JD 2457800.5)
| uncertainty = 0
| observation_arc = 101.83 yr (37,194 days)
| aphelion = 2.6904 AU
| perihelion = 2.3793 AU
| semimajor = 2.5348 AU
| eccentricity = 0.0614
| period = 4.04 yr (1,474 days)
| mean_anomaly = 277.77°
| mean_motion = {{Deg2DMS|0.2442|sup=ms}} / day
| inclination = 4.5102°
| asc_node = 238.35°
| arg_peri = 355.40°
| dimensions = {{val|19.20|0.49}} km[4]
{{val|21.197|0.208}}[5]
{{val|21.678|0.046}} km[6]
{{val|21.91|0.41}} km[7]
25.41 km {{small|(calculated)}}[8]
| rotation = {{val|4.5}} h {{small|(dated)}}[9]
{{val|4.54619|0.00005}} h[10]
{{val|4.5462|0.0004}} h[11]
{{val|4.5463|0.0002}} h[11]
{{val|4.55|0.01}} h[13]
| albedo = 0.20 {{small|(assumed)}}[8]
{{val|0.281|0.012}}[7]
{{val|0.287|0.045}}[5]
{{val|0.2878|0.0282}}[6]
{{val|0.350|0.051}}[4]
| spectral_type = B–V = 0.887
U–B = 0.505
S {{small|(Tholen)}}
S {{small|(SMASS)}}
| abs_magnitude = 10.34[4][6][7][8]{{·}}{{val|10.34|0.28}}[28]
}}797 Montana, provisional designation {{mp|1914 VR}}, is a stony asteroid from the middle region of the asteroid belt, approximately 22 kilometers in diameter. It was discovered on 17 November 1914, by Danish astronomer Holger Thiele at Bergedorf Observatory in Hamburg, Germany.[29] It was later named for the discovering observatory.[2]

Classification and orbit

Montana is a stony asteroid that orbits the Sun in the middle main-belt at a distance of 2.4–2.7 AU once every 4.04 years (1,474 days). Its orbit has an eccentricity of 0.06 and an inclination of 5° with respect to the ecliptic. The first identification at Heidelberg dates back to 1898 ({{small|A898 WA / 1898 WA}}), while the asteroid's observation arc begins two months after its discovery with the first used observation made at Bergedorf in 1915.[29]

Physical characteristics

In both the Tholen and SMASS taxonomy, Montana is a common stony S-type asteroid.

Rotation period

Between 2003 and 2007, three rotational lightcurves of Montana were obtained from photometric observations made by amateur astronomers René Roy, Horacio Correia, Laurent Bernasconi, and Richard Ditteon. All three lightcurves gave a well-defined rotation period of 4.55 hours with a brightness variation between 0.32 and 0.41 magnitude ({{small|U=3/3/3}}).[11][13]

Diameter and albedo

According to the space-based surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Montana{{'}}s surface has an albedo of 0.28–0.35 and its diameter measures between 19.2 and 21.9 kilometers,[4][5][6][7] while the Collaborative Asteroid Lightcurve Link 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.[8]

Naming

This minor planet was named in honor of the Bergedorf Observatory. It was the observatory's first ever made discovery. "Montana" means "mountain village" in Latin and literally translates to "Bergedorf" in German ({{small|H 79}}).[2]

References

1. ^1 2 3 {{cite book |title = Dictionary of Minor Planet Names – (797) Montana |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 74 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_798 |chapter = (797) Montana }}
2. ^1 2 {{cite web |title = 797 Montana (1914 VR) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=797 |accessdate = 26 May 2016}}
3. ^1 2 3 {{cite web |title = Asteroids and comets rotation curves – (797) Montana |last = Behrend |first = Raoul |publisher = Geneva Observatory |url = http://obswww.unige.ch/~behrend/page3cou.html#000797 |accessdate = 26 May 2016}}
4. ^1 2 3 4 {{cite web |title = LCDB Data for (797) Montana |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=797%7CMontana |accessdate = 26 May 2016}}
5. ^1 2 3 4 {{cite journal |display-authors = 6 |first1 = Fumihiko |last1 = Usui |first2 = Daisuke |last2 = Kuroda |first3 = Thomas G. |last3 = Müller |first4 = Sunao |last4 = Hasegawa |first5 = Masateru |last5 = Ishiguro |first6 = Takafumi |last6 = Ootsubo |first7 = Daisuke |last7 = Ishihara |first8 = Hirokazu |last8 = Kataza |first9 = Satoshi |last9 = Takita |first10 = Shinki |last10 = Oyabu |first11 = Munetaka |last11 = Ueno |first12 = Hideo |last12 = Matsuhara |first13 = Takashi |last13 = Onaka |date = October 2011 |title = Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011PASJ...63.1117U |journal = Publications of the Astronomical Society of Japan |volume = 63 |issue = 5 |pages = 1117–1138 |bibcode = 2011PASJ...63.1117U |doi = 10.1093/pasj/63.5.1117 |access-date= 26 May 2016}}
6. ^1 2 3 4 {{cite journal |display-authors = 6 |first1 = A. |last1 = Mainzer |first2 = T. |last2 = Grav |first3 = J. |last3 = Masiero |first4 = E. |last4 = Hand |first5 = J. |last5 = Bauer |first6 = D. |last6 = Tholen |first7 = R. S. |last7 = McMillan |first8 = T. |last8 = Spahr |first9 = R. M. |last9 = Cutri |first10 = E. |last10 = Wright |first11 = J. |last11 = Watkins |first12 = W. |last12 = Mo |first13 = C. |last13 = Maleszewski |date = November 2011 |title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...90M |journal = The Astrophysical Journal |volume = 741 |issue = 2 |page = 25 |bibcode = 2011ApJ...741...90M |doi = 10.1088/0004-637X/741/2/90 |arxiv = 1109.6407 |access-date= 26 May 2016}}
7. ^1 2 3 4 {{cite journal |display-authors = 6 |first1 = Joseph R. |last1 = Masiero |first2 = A. K. |last2 = Mainzer |first3 = T. |last3 = Grav |first4 = J. M. |last4 = Bauer |first5 = R. M. |last5 = Cutri |first6 = C. |last6 = Nugent |first7 = M. S. |last7 = Cabrera |date = November 2012 |title = Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M |journal = The Astrophysical Journal Letters |volume = 759 |issue = 1 |page = 5 |bibcode = 2012ApJ...759L...8M |doi = 10.1088/2041-8205/759/1/L8 |arxiv = 1209.5794 |access-date= 26 May 2016}}
8. ^1 {{Cite journal |display-authors = 6 |first1 = C. A. |last1 = Angeli |last2 = Guimarã |first3 = T. A. |last3 = es |first4 = D. |last4 = Lazzaro |first5 = R. |last5 = Duffard |first6 = S. |last6 = Fernández |first7 = M. |last7 = Florczak |first8 = T. |last8 = Mothé-Diniz |first9 = J. M. |last9 = Carvano |first10 = A. S. |last10 = Betzler |date = April 2001 |title = Rotation Periods for Small Main-Belt Asteroids From CCD Photometry |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2001AJ....121.2245A |journal = The Astronomical Journal |volume = 121 |issue = 4 |pages = 2245–2252 |bibcode = 2001AJ....121.2245A |doi = 10.1086/319936 |access-date= 26 May 2016}}
9. ^1 2 {{Cite journal |display-authors = 6 |first1 = Richard |last1 = Ditteon |first2 = Brian |last2 = Hirsch |first3 = Elaine |last3 = Kirkpatrick |first4 = Stephen |last4 = Kramb |first5 = Matthew |last5 = Kropf |first6 = Joshua |last6 = Meehl |first7 = Michael |last7 = Stanfield |first8 = Eric |last8 = Tollefson |first9 = Andrew |last9 = Twarek |date = September 2004 |title = 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 |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2004MPBu...31...54D |journal = The Minor Planet Bulletin |volume = 31 |issue = 3 |pages = 54–56 |issn = 1052-8091 |bibcode = 2004MPBu...31...54D |access-date= 26 May 2016}}
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11. ^1 {{cite journal |display-authors = 6 |first1 = Peter |last1 = Veres |first2 = Robert |last2 = Jedicke |first3 = Alan |last3 = Fitzsimmons |first4 = Larry |last4 = Denneau |first5 = Mikael |last5 = Granvik |first6 = Bryce |last6 = Bolin |first7 = Serge |last7 = Chastel |first8 = Richard J. |last8 = Wainscoat |first9 = William S. |last9 = Burgett |first10 = Kenneth C. |last10 = Chambers |first11 = Heather |last11 = Flewelling |first12 = Nick |last12 = Kaiser |first13 = Eugen A. |last13 = Magnier |first14 = Jeff S. |last14 = Morgan |first15 = Paul A. |last15 = Price |first16 = John L. |last16 = Tonry |first17 = Christopher |last17 = Waters |date = November 2015 |title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V |journal = Icarus |volume = 261 |pages = 34–47 |bibcode = 2015Icar..261...34V |doi = 10.1016/j.icarus.2015.08.007 |arxiv = 1506.00762 |access-date= 26 May 2016}}
12. ^1 2 3 {{cite journal |display-authors = 6 |first1 = Joseph R. |last1 = Masiero |first2 = T. |last2 = Grav |first3 = A. K. |last3 = Mainzer |first4 = C. R. |last4 = Nugent |first5 = J. M. |last5 = Bauer |first6 = R. |last6 = Stevenson |first7 = S. |last7 = Sonnett |date = August 2014 |title = Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M |journal = The Astrophysical Journal |volume = 791 |issue = 2 |page = 11 |bibcode = 2014ApJ...791..121M |doi = 10.1088/0004-637X/791/2/121 |arxiv = 1406.6645 |access-date= 12 December 2016}}
[1][2][3][4][5][6][7][8][9][10][11][12]

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External links

  • Asteroid Lightcurve Database (LCDB), query form (info)
  • [https://books.google.com/books?id=aeAg1X7afOoC Dictionary of Minor Planet Names], Google books
  • Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
  • Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
  • {{AstDys|797}}
  • {{JPL small body}}
{{Use dmy dates|date=July 2018}}{{Minor planets navigator |796 Sarita |number=797 |798 Ruth}}{{Small Solar System bodies}}{{DEFAULTSORT:Montana}}

6 : Background asteroids|Discoveries by Holger Thiele|Named minor planets|S-type asteroids (Tholen)|S-type asteroids (SMASS)|Astronomical objects discovered in 1914
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