| 词条 | 4765 Wasserburg |
| 释义 |
| minorplanet = yes | name = 4765 Wasserburg | background = #D6D6D6 | image = | image_size = | caption = | discovery_ref = | discovered = 5 May 1986 | discoverer = C. Shoemaker | discovery_site = Palomar Obs. | mpc_name = (4765) Wasserburg | alt_names = {{mp|1986 JN|1}}{{·}}{{mp|1983 EA|1}} 1986 LF | pronounced = | named_after = Gerald J. Wasserburg {{small|(American geologist)}}[2] | mp_category = main-belt {{small|(inner)}} {{·}}Hungaria [4][5] | orbit_ref = | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 0 | observation_arc = 33.15 yr (12,108 days) | aphelion = 2.0621 AU | perihelion = 1.8289 AU | semimajor = 1.9455 AU | eccentricity = 0.0599 | period = 2.71 yr (991 days) | mean_anomaly = 237.52° | mean_motion = {{Deg2DMS|0.3632|sup=ms}} / day | inclination = 23.710° | asc_node = 76.546° | arg_peri = 108.33° | satellites = 1 {{small|(suspected)}}[7][8] | dimensions = {{val|1.777|0.485}} km[9][10] 3.82 km {{small|(calculated)}}[5] | rotation = {{val|3.6231|0.0005}} h[7] {{val|3.625|0.001}} h[13] {{val|3.62532|0.00002}} h{{efn|name=LCDB-Pravec-2010}} {{val|3.626|0.005}} h{{efn|name=LCDB-Pravec-2013}} {{val|3.6260|0.0005}} h[14] {{val|3.6280|0.0005}} h[15] {{val|3.664|0.003}} h[16] {{val|3.67|0.02}} h {{small|(dated)}}[17] | albedo = 0.4 {{small|(assumed)}}[5] {{val|1.000|0.087}}[9][10] | spectral_type = E [5] B–V = {{val|0.852|0.043}}[22] V–R = {{val|0.456|0.023}}[22] V–I = {{val|0.813|0.040}}[22] | abs_magnitude = 13.7[5]{{·}}14.1[9] }}4765 Wasserburg, provisional designation {{mp|1986 JN|1}}, is a bright Hungaria asteroid, suspected binary system and asteroid pair from the innermost regions of the asteroid belt, approximately 3 kilometers in diameter. It was discovered on 5 May 1986, by American astronomer Carolyn Shoemaker at Palomar Observatory, and later named after geologist Gerald J. Wasserburg.[2][4] Orbit and classificationWasserburg is a bright member of the Hungaria family, which form the innermost dense concentration of asteroids in the Solar System. It orbits the Sun in the inner main-belt at a distance of 1.8–2.1 AU once every 2 years and 9 months (991 days). Its orbit has an eccentricity of 0.06 and an inclination of 24° with respect to the ecliptic. It was first identified as {{mp|1983 EA|1}} at Palomar in 1983, extending the body's observation arc by 3 years prior to its official discovery observation.[4]Wasserburg forms an asteroid pair with {{LoMP|350716|{{mp|(350716) 2001 XO|105}}}}, and was part of Petr Pravec's sample study Formation of asteroid pairs by rotational fission, published in the journal Nature.[5][14]Physical characteristicsDiameter and albedoAccording to preliminary results from the survey carried out by NASA's Wide-field Infrared Survey Explorer (WISE) with its subsequent NEOWISE mission, Wasserburg measures 1.777 kilometers in diameter and its surface has an outstandingly high albedo of 1.000,[9][10] while the Collaborative Asteroid Lightcurve Link assumes it to be an E-type asteroid, with albedo of 0.40 – derived from 434 Hungaria the family's namesake and most prominent member – and calculates a larger diameter of 3.82 kilometers with an absolute magnitude of 13.7.[5] Rotation periodBetween 2006 and 2014, several rotational lightcurves of Wasserburg were obtained from photometric observations by astronomers Brian Warner at his Palmer Divide Observatory ({{small|716}}), Petr Pravec at Ondřejov Observatory, and Julian Oey at Blue Mountains Observatory ({{small|E19}}). Best rated lightcurve analysis gave a well-defined rotation period between 3.6231 and 3.6280 hours with a brightness variation between 0.07 and 0.60 magnitude ({{small|U=3/3/3/3-}}).[7][13][14][15]{{efn|name=LCDB-Pravec-2010}}{{efn|name=LCDB-Pravec-2013}}{{efn|name=Lightcurve-plots}} Due to the changing amplitude, Wasserburg is likely one of the more elongatedly shaped primary asteroids of all known smaller binaries with an diameter of less than 10 kilometers.[7] SatelliteAfter being already recognized as an asteroid pair, American astronomer Brian Warner observed faint mutual eclipsing and occultation events in April 2013. After repeated lightcurve subtraction, he was able to show that Wasserburg is likely a binary system with a minor-planet moon orbiting it every 15.97 hours. Assuming a depth of 0.03 magnitude, he estimated a secondary-to-primary mean-diameter ratio of {{val|0.16|0.02}}.[7] The Johnston's archive derives a diameter of {{val|280|80}} meters for the satellite, based on the primary diameter given by WISE.[8] A semi-major axis of 2.9 kilometers is also estimated for the moons orbit.[8] However, photometric observations taken in 2015, could not detect the presence of a satellite and Wasserburg remains only a suspected binary.[16] NamingThis minor planet was named after American Gerald J. Wasserburg (1927–2016), who was a professor of geology and geophysics at Caltech in California. He was a pioneer of radiometric dating methods used in isotope geochemistry and was prominent for his accurate age determination measurements of moon rocks, which were instrumental for reconstructing the origin of the Moon and for the hypothesis of the Late Heavy Bombardment.[2] Wasserburg also carried out isotopic analyses of meteorites, developed a time scale for the formation and evolution of the Solar System, and contributed to the theory of nucleosynthesis.[2] The official naming citation was published on 27 June 1991 ({{small|M.P.C. 18464}}).[48] Notes{{notelist|refs={{efn|name=LCDB-Pravec-2010|1=Pravec (2010) web: rotation period {{val|3.62532|0.00002}} hours with a brightness amplitude of {{val|0.59}} mag. Quality code of 3. Summary figures at Collaborative Asteroid Lightcurve Link – CALL and Pravec, P.; Wolf, M.; Sarounova, L. (2010)}}{{efn|name=Lightcurve-plots|1= lightcurve plot Modra-PDO (A) and lightcurve plot Modra-PDO (B) taken at Modra, PDO, by Kusnirak and Pravec, rotation period {{val|3.62532|0.00002}} hours with a brightness amplitude of {{val|0.59}} mag. Quality Code of 3. Time span: 3 January 2010 to 7 March 2010. lightcurve plot Warner Palmer Divide Observatory, Brian D. Warner (2010). rotation period {{val|3.625|0.001}} hours with a brightness amplitude of {{val|0.60|0.02}} mag.Quality Code {{=}} 3. Time span: 5 and 8 January 2010.}}{{efn|name=LCDB-Pravec-2013|1=Pravec (2013) web: rotation period {{val|3.626|0.005}} hours with a brightness amplitude of {{val|0.25}} mag. Quality code of 3. Summary figures at Collaborative Asteroid Lightcurve Link – CALL and Pravec, P.; Wolf, M.; Sarounova, L. (2013)}}}} References1. ^1 2 3 4 {{cite book |title = Dictionary of Minor Planet Names – (4765) Wasserburg |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 410 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_4671 |chapter = (4765) Wasserburg }} [1][2][3][4][5][6][7][8][9][10][11][12][13][14]2. ^1 2 3 {{cite web |title = 4765 Wasserburg (1986 JN1) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=4765 |accessdate = 18 April 2017}} 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 = 18 April 2017}} 4. ^1 2 3 {{cite web |first1 = Robert |last1 = Johnston |title = (4765) Wasserburg |publisher = johnstonsarchive.net |date = 21 September 2014 |url = http://www.johnstonsarchive.net/astro/astmoons/am-04765.html |accessdate = 18 April 2017}} 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 |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= 18 April 2017}} 6. ^1 2 3 4 5 6 7 {{cite web |title = LCDB Data for (4765) Wasserburg |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=4765%7CWasserburg |accessdate = 18 April 2017}} 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 }} 8. ^1 {{Cite journal |author = Warner, Brian D. |date = September 2007 |title = Asteroid Lightcurve Analysis at the Palmer Divide Observatory - December 2006 - March 2007 |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2007MPBu...34...72W |journal = The Minor Planet Bulletin |volume = 34 |issue = 3 |pages = 72–77 |issn = 1052-8091 |bibcode = 2007MPBu...34...72W |access-date= 18 April 2017}} 9. ^1 2 {{Cite journal |author = Warner, Brian D. |date = July 2010 |title = Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2009 December - 2010 March |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2010MPBu...37..112W |journal = The Minor Planet Bulletin |volume = 37 |issue = 3 |pages = 112–118 |issn = 1052-8091 |bibcode = 2010MPBu...37..112W |access-date= 18 April 2017}} 10. ^1 2 3 {{cite journal |display-authors = 6 |first1 = P. |last1 = Pravec |first2 = D. |last2 = Vokrouhlický |first3 = D. |last3 = Polishook |first4 = D. J. |last4 = Scheeres |first5 = A. W. |last5 = Harris |first6 = A. |last6 = Galád |first7 = O. |last7 = Vaduvescu |first8 = F. |last8 = Pozo |first9 = A. |last9 = Barr |first10 = P. |last10 = Longa |first11 = F. |last11 = Vachier |first12 = F. |last12 = Colas |first13 = D. P. |last13 = Pray |first14 = J. |last14 = Pollock |first15 = D. |last15 = Reichart |first16 = K. |last16 = Ivarsen |first17 = J. |last17 = Haislip |first18 = A. |last18 = Lacluyze |first19 = P. |last19 = Kusnirák |first20 = T. |last20 = Henych |first21 = F. |last21 = Marchis |first22 = B. |last22 = Macomber |first23 = S. A. |last23 = Jacobson |first24 = Yu. N. |last24 = Krugly |first25 = A. V. |last25 = Sergeev |first26 = A. |last26 = Leroy |date = August 2010 |title = Formation of asteroid pairs by rotational fission |journal = Nature |volume = 466 |issue = 7310 |pages = 1085–1088 |bibcode = 2010Natur.466.1085P |doi = 10.1038/nature09315 |arxiv = 1009.2770 }} 11. ^1 2 3 4 5 {{Cite journal |first1 = Brian D. |last1 = Warner |first2 = Robert D. |last2 = Stephens |date = October 2013 |title = One New and One Suspected Hungaria Binary Asteroid |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013MPBu...40..221W |journal = The Minor Planet Bulletin |volume = 40 |issue = 4 |pages = 221–223 |issn = 1052-8091 |bibcode = 2013MPBu...40..221W |access-date= 18 April 2017}} 12. ^1 2 {{Cite journal |author = Warner, Brian D. |date = April 2015 |title = Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 October-December |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015MPBu...42..108W |journal = The Minor Planet Bulletin |volume = 42 |issue = 2 |pages = 108–114 |issn = 1052-8091 |bibcode = 2015MPBu...42..108W |access-date= 18 April 2017}} 13. ^1 2 {{Cite journal |author = Oey, Julian |date = January 2016 |title = Lightcurve Analysis of Asteroids from Blue Mountains Observatory in 2014 |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016MPBu...43...45O |journal = The Minor Planet Bulletin |volume = 43 |issue = 1 |pages = 45–51 |issn = 1052-8091 |bibcode = 2016MPBu...43...45O |access-date= 18 April 2017}} 14. ^1 2 3 {{Cite journal |author = Ye, Q.-z. |date = February 2011 |title = BVRI Photometry of 53 Unusual Asteroids |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011AJ....141...32Y |journal = The Astronomical Journal |volume = 141 |issue = 2 |page = 8 |bibcode = 2011AJ....141...32Y |doi = 10.1088/0004-6256/141/2/32 |arxiv = 1011.0133 |access-date= 18 April 2017}} }} External links
6 : Hungaria asteroids|Discoveries by Carolyn S. Shoemaker|Minor planets named for people|Named minor planets|Binary asteroids|Astronomical objects discovered in 1986 |
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