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词条 5391 Emmons
释义

  1. Orbit and classification

  2. Physical characteristics

      Rotation period    Diameter and albedo  

  3. Naming

  4. References

  5. External links

{{Infobox planet
| minorplanet = yes
| name = 5391 Emmons
| background = #D6D6D6
| image =
| image_size =
| caption =
| discovery_ref =  [1]
| discoverer = E. F. Helin
| discovery_site = Palomar Obs.
| discovered = 13 September 1985
| mpc_name = (5391) Emmons
| alt_names = {{mp|1985 RE|2}}{{·}}1934 RH
{{mp|1951 RF|1}}{{·}}{{mp|1975 VE|3}}
| pronounced =
| named_after = Richard Emmons [1]
{{small|(American astronomer)}}
| mp_category = main-belt [1]{{·}}{{small|(inner)}}
background [5]
| orbit_ref =  
| epoch = 23 March 2018 (JD 2458200.5)
| uncertainty = 0
| observation_arc = 67.86 yr (24,787 d)
| aphelion = 2.8087 AU
| perihelion = 1.7108 AU
| semimajor = 2.2598 AU
| eccentricity = 0.2429
| period = 3.40 yr (1,241 d)
| mean_anomaly = 220.53°
| mean_motion = {{Deg2DMS|0.2901|sup=ms}} / day
| inclination = 2.5123°
| asc_node = 336.40°
| arg_peri = 344.75°
| mean_diameter = {{val|5.578|0.083|ul=km}}[7][8]
{{val|5.93|u=km}} {{small|(calculated)}}[9]
| rotation = {{val|3.028|0.004|ul=h}}[10]
| albedo = {{val|0.20}} {{small|(assumed)}}[9]
{{val|0.298|0.035}}[7][8]
| spectral_type = C {{small|(assumed)}}[9]
S {{small|(SDSS-MOC)}}
S {{small|(Pan-STARRS)}}[15]
| abs_magnitude = 13.2[8]
13.4
13.5[9]
{{val|13.57|0.29}}[15]
}}5391 Emmons, provisional designation {{mp|1985 RE|2}}, is a background asteroid from the inner regions of the asteroid belt, approximately {{convert|6|km|mi|abbr=off|sigfig=1|sp=us}} in diameter. It was discovered on 13 September 1985, by American astronomer Eleanor Helin at the Palomar Observatory.[1] The likely S-type asteroid has a rotation period of 3.0 hours.[9] It was named for American astronomer Richard Emmons.[1]

Orbit and classification

Emmons is a non-family asteroid from the main belt's background population.[5] It orbits the Sun in the inner main-belt at a distance of 1.7–2.8 AU once every 3 years and 5 months (1,241 days; semi-major axis of 2.26 AU). Its orbit has an eccentricity of 0.24 and an inclination of 3° with respect to the ecliptic.

The asteroid was first observed as {{mp|1934 RH}} at the Union Observatory in September 1934. The body's observation arc begins 35 years prior to its official discovery observation with a precovery at Palomar in April 1950.[1]

Physical characteristics

Emmons has been characterized as a common, stony S-type asteroid by the Pan-STARRS{{'}} survey and by the SDSS-based taxonomic system (latter poorly secured; LSQ). The asteroid is also a generically assumed C-type.[9][15][28]

Rotation period

In September 2002, a rotational lightcurve of Emmons was obtained from photometric observations by astronomers at the Goodsell Observatory {{Obscode|741}}. Lightcurve analysis gave a rotation period of 3.028 hours with a brightness amplitude of 0.16 magnitude ({{small|U=2}}).[10]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Emmons measures 5.578 kilometers in diameter and its surface has an albedo of 0.298,[7][8] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a stony asteroid of 0.20, and calculates a diameter of 5.93 kilometers based on an absolute magnitude of 13.5.[9]

Naming

This minor planet was named after American astronomer Richard H. Emmons (1919–2005), who was a longtime professor of physics and astronomy at Kent State University and known as "Mr. Astronomy" to the thousands of children and residents who looked at the heavens through his homemade telescopes. From the 1950s to 1963, school children, Boy Scouts, church groups and community organizations visited his North Canton garage, known as "The Star Barn," which he had converted into the area's only planetarium. It seated 38. Emmons was also an early observer of artificial satellites.[1]

The official naming citation was published by the Minor Planet Center on 23 May 2000 ({{small|M.P.C. 40701}}).[34]

References

1. ^1 2 3 4 5 6 7 {{cite web |title = 5391 Emmons (1985 RE2) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=5391 |accessdate = 28 May 2018}}
2. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 28 May 2018}}
3. ^1 2 3 {{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 |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 }}
4. ^1 2 {{cite web |title = Asteroid 5391 Emmons |work = Small Bodies Data Ferret |url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=5391+Emmons |accessdate = 28 May 2018}}
5. ^1 {{Cite journal |first1 = J. M. |last1 = Carvano |first2 = P. H. |last2 = Hasselmann |first3 = D. |last3 = Lazzaro |first4 = T. |last4 = Mothé-Diniz |date = February 2010 |title = SDSS-based taxonomic classification and orbital distribution of main belt asteroids |url = https://sbn.psi.edu/pds/asteroid/EAR_A_I0035_5_SDSSTAX_V1_1/data/sdsstax_ast_table.tab |journal = Astronomy and Astrophysics |volume = 510 |page = 12 |bibcode = 2010A&A...510A..43C |doi = 10.1051/0004-6361/200913322 |access-date = 28 May 2018 |archive-url = https://web.archive.org/web/20180502064602/https://sbn.psi.edu/pds/asteroid/EAR_A_I0035_5_SDSSTAX_V1_1/data/sdsstax_ast_table.tab |archive-date = 2 May 2018 |dead-url = yes |df = dmy-all }}
6. ^1 2 3 4 5 6 7 {{cite web |title = LCDB Data for (5391) Emmons |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=5391%7CEmmons |accessdate = 28 May 2018}}
7. ^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 |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 }} (catalog)
8. ^1 2 {{Cite journal |first1 = Maurice |last1 = Clark |first2 = Brian |last2 = Joyce |date = December 2002 |title = Asteroid lightcurve photometry from Goodsell Observatory (741) |journal = The Minor Planet Bulletin |volume = 30 |issue = 1 |pages = 4–7 |issn = 1052-8091 |bibcode = 2003MPBu...30....4C }}
9. ^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 |journal = Icarus |volume = 261 |pages = 34–47 |bibcode = 2015Icar..261...34V |doi = 10.1016/j.icarus.2015.08.007 |arxiv = 1506.00762 }}
[1][2][3][4][5][6][7][8][9]

}}

External links

  • Asteroid (5391) Emmons, at twcac.org
  • 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 (5001)-(10000) – Minor Planet Center
  • {{AstDys|5391}}
  • {{JPL small body}}
{{Use dmy dates|date=May 2018}}{{Minor planets navigator |5390 Huichiming |number=5391 |5392 Parker}}{{Small Solar System bodies}}{{DEFAULTSORT:Emmons}}

5 : Background asteroids|Discoveries by Eleanor F. Helin|Minor planets named for people|Named minor planets|Astronomical objects discovered in 1985
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