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词条 1995 Hajek
释义

  1. Orbit and classification

  2. Physical characteristics

  3. Naming

  4. References

  5. External links

{{Infobox planet
| minorplanet = yes
| name = 1995 Hajek
| background = #D6D6D6
| image =
| image_size =
| caption =
| discovery_ref =  
| discovered = 26 October 1971
| discoverer = L. Kohoutek
| discovery_site = Bergedorf Obs.
| mpc_name = (1995) Hajek
| alt_names = {{mp|1971 UP|1}}{{·}}1941 EA
| named_after = Tadeáš Hájek {{small|(astronomer)}}[2]
| mp_category = main-belt{{·}}{{small|(middle)}} [3]
| orbit_ref =  
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 76.21 yr (27,836 days)
| aphelion = 2.6677 AU
| perihelion = 2.3911 AU
| semimajor = 2.5294 AU
| eccentricity = 0.0547
| period = 4.02 yr (1,469 days)
| mean_anomaly = 6.1573°
| mean_motion = {{Deg2DMS|0.2450|sup=ms}} / day
| inclination = 10.825°
| asc_node = 47.232°
| arg_peri = 134.65°
| dimensions = 6.50 km {{small|(calculated)}}[3]
{{val|12.683|0.288}} km[6][7]
{{val|14.45|2.58}} km[8]
{{val|15.29|1.04}} km[9]
| rotation = {{val|10|}} h[10]
| albedo = {{val|0.040|0.025}}[8][7]
{{val|0.063|0.010}}[9]
{{val|0.0833|0.0249}}[6]
0.20 {{small|(assumed)}}[3]
| spectral_type = P [6]{{·}}X [3][18][19]
| abs_magnitude = 12.80[6][9]{{·}}{{val|13.06|0.33}}[18]{{·}}13.3[3][8]
}}

1995 Hajek, provisional designation {{mp|1971 UP|1}}, is a metallic asteroid from the middle region of the asteroid belt, approximately 13 kilometers in diameter.

It was discovered on 26 October 1971, by Czech astronomer Luboš Kohoutek at the Bergedorf Observatory in Hamburg, Germany.[26] It was named after Renaissance astronomer Tadeáš Hájek.[2]

Orbit and classification

Hajek orbits the Sun in the middle main-belt at a distance of 2.4–2.7 AU once every 4.02 years (1,469 days). Its orbit has an eccentricity of 0.05 and an inclination of 11° with respect to the ecliptic. It was first identified as {{mp|1941 EA}} at Heidelberg in 1941. The body's used observation was a precovery taken at Palomar Observatory in 1951, extending its observation arc by 20 years prior to the official discovery observation at Heidelberg.

Physical characteristics

A first rotational lightcurve of Hajek was obtained by French amateur astronomers Alain Klotz, Marc Rieugné, and Pierre Thierry in October 2013. It gave a provisional rotation period of 10 hours with a brightness variation of 0.10 magnitude ({{small|U=1+}}).[10]

Hajek has the spectral properties of a metallic X-type asteroid.[3][18][19] It is also classified as a dark P-type asteroid by NASA's Wide-field Infrared Survey Explorer (WISE).[6]

According to the surveys carried out by the Japanese Akari satellite and WISE space-telescope with its subsequent NEOWISE mission, Hajek measures between 12.7 and 15.3 kilometers in diameter and its surface has an albedo of 0.040 and 0.083.[6][8][9] The Collaborative Asteroid Lightcurve Link strongly disagrees with the space-based observations and assumes a standard albedo for stony asteroids of 0.200 and calculates a much smaller diameter of 6.5 kilometers.[3] These contrasting albedo and diameter figures closely correspond to a generic magnitude-to-diameter conversion, where, for an absolute magnitude of 13.3, the body's diameter is in the range of 6 to 14 kilometers, based on an albedo between 0.05 and 0.25.[38]

Naming

This minor planet was named after the Bohemian astronomer Tadeáš Hájek (1525–1600), better known by his Latinized name, Thaddaeus Hagecius. He was one of the founders of modern stellar and cometary astronomy, who studied the Great Comet of 1577 and the supernova SN 1572, also known as Tycho's Nova. The lunar crater Hagecius is also named in his honour.[2] The approved naming citation was published by the Minor Planet Center before November 1977 ({{small|M.P.C. 4358}}).[40]

References

1. ^1 2 3 {{cite book |title = Dictionary of Minor Planet Names – (1995) Hajek |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 161 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_1996 |chapter = (1995) Hajek }}
2. ^1 {{cite web |title = 1995 Hajek (1971 UP1) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=1995 |accessdate = 8 December 2016}}
3. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = http://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 8 December 2016}}
4. ^1 2 {{cite web |title = Asteroids and comets rotation curves – (1995) Hajek |last = Behrend |first = Raoul |publisher = Geneva Observatory |url = http://obswww.unige.ch/~behrend/page4cou.html#001995 |accessdate = 8 December 2016}}
5. ^1 {{cite web |title=Absolute Magnitude (H) |publisher=NASA/JPL |url=http://neo.jpl.nasa.gov/glossary/h.html |accessdate=2014-06-24}}
6. ^1 2 {{cite journal |author = Xu, Shui |author2 = Binzel, Richard P. |author3 = Burbine, Thomas H. |author4 = Bus, Schelte J. |date = May 1995 |title = Small main-belt asteroid spectroscopic survey: Initial results |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1995Icar..115....1X |journal = Icarus |volume = 115 |issue = 1 |pages = 1–35 |issn = 0019-1035 |bibcode = 1995Icar..115....1X |doi = 10.1006/icar.1995.1075 |access-date= 17 December 2015}}
7. ^1 2 3 4 5 6 7 {{cite web |title = LCDB Data for (1995) Hajek |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1995%7CHajek |accessdate = 8 December 2016}}
8. ^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://pasj.oxfordjournals.org/content/63/5/1117.full.pdf+html |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= 8 December 2016}}
9. ^1 2 3 4 5 6 {{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 |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 }}
10. ^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= 8 December 2016}}
11. ^1 2 3 {{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= 8 December 2016}}
12. ^1 2 {{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 = J. |last6 = Dailey |first7 = P. R. M. |last7 = Eisenhardt |first8 = R. S. |last8 = McMillan |first9 = T. B. |last9 = Spahr |first10 = M. F. |last10 = Skrutskie |first11 = D. |last11 = Tholen |first12 = R. G. |last12 = Walker |first13 = E. L. |last13 = Wright |first14 = E. |last14 = DeBaun |first15 = D. |last15 = Elsbury |first16 = T., IV |last16 = Gautier |first17 = S. |last17 = Gomillion |first18 = A. |last18 = Wilkins |date = November 2011 |title = Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M |journal = The Astrophysical Journal |volume = 741 |issue = 2 |page = 20 |bibcode = 2011ApJ...741...68M |doi = 10.1088/0004-637X/741/2/68 |arxiv = 1109.4096 |access-date= 8 December 2016}}
[1][2][3][4][5][6][7][8][9][10][11][12]

}}

External links

  • Asteroid Lightcurve Database (LCDB), query form (info)
  • [https://books.google.com/books?id=aeAg1X7afOoC&pg 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
  • {{JPL small body}}
{{Minor planets navigator|1994 Shane|number=1995|1996 Adams}}{{Small Solar System bodies}}{{DEFAULTSORT:Hajek}}

6 : Background asteroids|Discoveries by Luboš Kohoutek|Minor planets named for people|Named minor planets|X-type asteroids|Astronomical objects discovered in 1971
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