| 词条 | 7638 Gladman |
| 释义 |
| minorplanet = yes | name = 7638 Gladman | background = #D6D6D6 | image = | image_size = | caption = | discovery_ref = [1] | discovered = 26 October 1984 | discoverer = E. Bowell | discovery_site = Anderson Mesa Stn. | mpc_name = (7638) Gladman | alt_names = 1984 UX{{·}}1969 AF 1988 UN | pronounced = | named_after = Brett J. Gladman [2] {{small|(Canadian astronomer)}} | mp_category = {{nowrap|main-belt [1]{{·}}{{small|(middle)}} [5]}} background [6] | orbit_ref = | epoch = 27 April 2019 (JD 2458600.5) | uncertainty = 0 | observation_arc = 49.46 yr (18,066 d) | aphelion = 3.3331 AU | perihelion = 1.7459 AU | semimajor = 2.5395 AU | eccentricity = 0.3125 | period = 4.05 yr (1,478 d) | mean_anomaly = 198.89° | mean_motion = {{Deg2DMS|0.2435|sup=ms}} / day | inclination = 6.8157° | asc_node = 9.9754° | arg_peri = 22.493° | mean_diameter = {{val|5.839|0.405|ul=km}}[8][9] | rotation = {{val|17.3|0.1|ul=h}}[10] | albedo = {{val|0.248|0.071}}[8] {{val|0.2480|0.0715}}[9] | spectral_type = S/Sk {{small|(S3OS2)}}[13] | abs_magnitude = 13.3[9] {{val|13.478|0.005}} {{small|(R)}}[15] 13.5[1] }}7638 Gladman, provisional designation {{mp|1984 UX}}, is a stony background asteroid from the central region of the asteroid belt, approximately {{convert|5.8|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 26 October 1984, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station near Flagstaff, Arizona.[1] The S-type asteroid has a rotation period of 17.3 hours.[5] It was named after Canadian astronomer Brett J. Gladman.[2] Orbit and classificationGladman is a non-family asteroid from the main belt's background population.[6] It orbits the Sun in the central asteroid belt at a distance of 1.7–3.3 AU once every 4 years and 1 month (1,478 days; semi-major axis of 2.54 AU). Its orbit has an eccentricity of 0.31 and an inclination of 7° with respect to the ecliptic. Gladman is not far from a prominent Kirkwood gap at 2.5 AU, which corresponds to a 3:1 orbital resonance with the gas giant Jupiter, where the Alinda asteroid are located. However, Gladman{{'s}} eccentricity is lower than that of most Alinda asteroids. It was first observed as {{mp|1969 AF}} at Crimea–Nauchnij in January 1969. The asteroid's observation arc begins with its first used observation at Palomar in November 1984, one month after its official discovery at Anderson Mesa.[1] NamingThis minor planet was named for Canadian astronomer Brett J. Gladman (born 1966), discoverer of minor planets and co-discoverer of 6 irregular moons of Uranus: Caliban, Sycorax, Prospero, Setebos, Stephano and Ferdinand. He participated in surveys of trans-Neptunian objects. He is also known for his research and modeling on the dynamical evolution and transport of near-Earth objects and meteorites, respectively.[2] The approved {{MoMP|7638|naming citation}} was published by the Minor Planet Center on 28 July 1999 ({{small|M.P.C. 35486}}).[25] Physical characteristicsGladman has been characterized as a stony S-type asteroid in the Tholen-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2). In their SMASS-like taxonomy, S3OS2 classified Gladman as an Sk-subtype that transitions to the K-type asteroids.[13]Rotation periodThree rotational lightcurves of Gladman have been obtained from photometric observations.[10][15][29] In October 2014, observations by French amateur astronomer Laurent Bernasconi gave a fragmentary lightcurve with a rotation period of 15 hours and brightness variation of 0.21 magnitude ({{small|U=1+}}). Subsequent photometric observations by James Brinsfield at the Via Capote Observatory {{Obscode|G69}} in October 2010, and by astronomers at the Palomar Transient Factory in March 2014, gave an improved period of {{val|17.3}} (best) and {{val|16.1956}} hours with a brightness amplitude of 0.50 and 0.25, respectively ({{small|U=2/2}}).[5] Diameter and albedoAccording to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 5.839 kilometers in diameter and its surface has an albedo of 0.248,[9][8] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 5.9 kilometers with an absolute magnitude of 13.5.[5] References1. ^1 2 3 {{cite book |title = Dictionary of Minor Planet Names – (7638) Gladman |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 607 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_6592k |chapter = (7638) Gladman |doi-broken-date = 2019-03-15 }} [1][2][3][4][5][6][7][8][9][10][11]2. ^1 2 3 4 5 {{cite web |title = 7638 Gladman (1984 UX) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=7638 |accessdate = 15 January 2019}} 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 = 5 November 2016}} 4. ^1 {{cite web |title = Asteroids and comets rotation curves – (7638) Gladman |last = Behrend |first = Raoul |publisher = Geneva Observatory |url = http://obswww.unige.ch/~behrend/page5cou.html#007638 |accessdate = 5 November 2016}} 5. ^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 }} 6. ^1 2 {{cite web |title = Small Bodies Data Ferret |work = Nesvorny HCM Asteroid Families V3.0 |url = https://sbntools.psi.edu/ferret/PropertySearch/familyForm.action |accessdate = 3 May 2018}} 7. ^1 2 {{Cite journal |first1 = D. |last1 = Lazzaro |first2 = C. A. |last2 = Angeli |first3 = J. M. |last3 = Carvano |first4 = T. |last4 = Mothé-Diniz |first5 = R. |last5 = Duffard |first6 = M. |last6 = Florczak |date = November 2004 |title = S3OS2: the visible spectroscopic survey of 820 asteroids |url = http://sirrah.troja.mff.cuni.cz/yarko-site/tmp/eos/NEW/spectral_type_figure/s3os2.pdf |journal = Icarus |volume = 172 |issue = 1 |pages = 179–220 |bibcode = 2004Icar..172..179L |doi = 10.1016/j.icarus.2004.06.006 |accessdate = 4 May 2018}} 8. ^1 2 3 4 {{cite web |title = LCDB Data for (7638) Gladman |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=7638%7CGladman |accessdate = 3 May 2018}} 9. ^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) 10. ^1 2 {{Cite journal |author = Brinsfield, James W. |date = April 2009 |title = Asteroid Lightcurve Analysis at the Via Capote Observatory: 2008 4th Quarter |journal = The Minor Planet Bulletin |volume = 36 |issue = 2 |pages = 64–66 |issn = 1052-8091 |bibcode = 2009MPBu...36...64B }} 11. ^1 2 {{cite journal |display-authors = 6 |first1 = Adam |last1 = Waszczak |first2 = Chan-Kao |last2 = Chang |first3 = Eran O. |last3 = Ofek |first4 = Russ |last4 = Laher |first5 = Frank |last5 = Masci |first6 = David |last6 = Levitan |first7 = Jason |last7 = Surace |first8 = Yu-Chi |last8 = Cheng |first9 = Wing-Huen |last9 = Ip |first10 = Daisuke |last10 = Kinoshita |first11 = George |last11 = Helou |first12 = Thomas A. |last12 = Prince |first13 = Shrinivas |last13 = Kulkarni |date = September 2015 |title = Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry |journal = The Astronomical Journal |volume = 150 |issue = 3 |page = 35 |bibcode = 2015AJ....150...75W |doi = 10.1088/0004-6256/150/3/75 |arxiv = 1504.04041}} }} External links
5 : Background asteroids|Discoveries by Edward L. G. Bowell|Minor planets named for people|Named minor planets|Astronomical objects discovered in 1984 |
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