773 Irmintraud
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet = yes
| name = 773 Irmintraud
| background = #D6D6D6
| image =
| caption =
| discovered = 22 December 1913
| discoverer = F. Kaiser
| discovery_site = Heidelberg Obs.
| mpc_name = (773) Irmintraud
| alt_names = 1913 TV{{·}}1946 SO
A910 CG
| pronounced = {{IPA|de|ˈɪʁmɪntʁaʊt|lang}}
| named_after = Irmtraud
{{small|(German given-name)}}
| mp_category = main-belt{{·}}{{small|(outer)}}
| epoch = 31 July 2016 (JD 2457600.5)
| uncertainty = 0
| observation_arc = 102.32 yr (37372 d)
| aphelion = {{Convert|3.0876|AU|Gm|abbr=on|lk=on}}
| perihelion = {{Convert|2.6294|AU|Gm|abbr=on}}
| semimajor = {{Convert|2.8585|AU|Gm|abbr=on}}
| eccentricity = 0.080135
| mean_anomaly = 220.21°
| inclination = 16.684°
| asc_node = 322.41°
| arg_peri = 331.91°
| dimensions = 95.88 km
{{val|87.07|1.76}} km
{{val|91.67|0.90}} km
| mean_radius = {{val|47.94|0.9}} km
| rotation = {{Convert|6.7514|h|d|abbr=on|lk=on}}
{{val|6.750|0.002}} h
{{val|6.75}} h
{{val|6.746|0.004}} h
{{val|6.748|0.001}} h
| albedo = 0.0440
{{val|0.053|0.003}}
{{val|0.048|0.006}}
{{val|0.0440|0.002}}
| spectral_type = B–V = 0.706
U–B = 0.284
D {{small|(Tholen)}}, T {{small|(SMASS)}}
T
| mean_motion = {{Deg2DMS|0.20394|sup=ms}} / day
| moid = {{Convert|1.62349|AU|Gm|abbr=on}}
| jupiter_moid = {{Convert|2.21251|AU|Gm|abbr=on}}
| tisserand = 3.236
}}
773 Irmintraud, provisional designation 1913 TV, is a dark and reddish, rare-type asteroid from the outer region of the asteroid belt, about 92 kilometers in diameter. It was discovered on 22 December 1913, by German astronomer Franz Kaiser at Heidelberg Observatory in southern Germany.
The asteroid is classified as a D-type and T-type body in the Tholen and SMASS taxonomy, respectively. The rare spectral T-type is similar to D-types which are often found among Jupiter trojans thought to have originated from the Kuiper belt. It orbits the Sun at a distance of 2.6–3.1 AU once every 4 years and 10 months (1,763 days). Its orbit is tilted by 17 degrees to the plane of the ecliptic and shows a low eccentricity of 0.08. According to the surveys carried out by the Infrared Astronomical Satellite, IRAS, the Japanese Akari satellite, and the Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the minor planet's low albedo lies in the range of 0.04–0.05. It has a well-defined rotation period of 6.75 hours, determined by several concurring observations.
773 Irmintraud commemorates the antiquated German feminine name, Irmtraud, that appears frequently in old songs and sagas. The asteroid is a likely source of the Tagish Lake meteorite which landed in Canada on January 18, 2000.
History
In 1992, Larry Lebofsky and colleagues published an article in which they noted that "unaltered asteroids are thought to represent the raw materials available for terrestrial planet formation and so are important to our understanding of the origin and evolution of the Solar System."Lebofsky, Larry A. (1992) NASA Scientific and Technical Information Program Office [https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19920001612_1992001612.pdf An Infrared Reflectance Study of Low Albedo Surface Constituents.] N92-10830. Since at least 1980, it was believed that D-type asteroids were unaltered asteroids, ultraprimitive in composition and composed largely of hydrated silicates and organic material. However, in analyzing the spectra of 773 Irmintraud for the water of hydration band (the 3-μm absorption feature of hydrated silicates), Lebofsky discovered the first D-type asteroid to show the water of hydration band on the surface of the asteroid. Lebofsky concluded that 773 Irmintraud had undergone an alteration process typically seen in a C-type asteroid, making 773 Irmintraud and perhaps other D-type asteroids less likely to represent the raw materials available for terrestrial planet formation. In addition, the discovery of water of hydration band on 773 Irmintraud meant that there may be major differences in mineralogy within individual type classification and astronomers must be careful in assuming that the C-, D-, and other type classification relate directly to mineralogy.
In 1997, NASA added 773 Irmintraud and eventually over one million other names to a microchip placed on board the Stardust spacecraft that launched February 7, 1999.NASA (July 16, 2001) [http://stardust.jpl.nasa.gov/overview/microchip/names2i2.html Microchip Names (I).] Accessed June 12, 2008. Placing the names onto the Stardust spacecraft was a public outreach effort. In particular, this served to promote public interest, awareness and support of the space program.
Image:773 Irmintraud preliminary spectrum.JPG graph of asteroid 773 Irmintraud, a main belt D-type asteroid that appears to show the presence of a 3-μm wavelength water of hydration band.}}]]
In September 2001, there was speculation that Tagish Lake meteorite which struck in British Columbia, Canada on January 18, 2000, was derived from a D-type asteroid, since the spectral shape and brightness of the meteorite was similar to D-type asteroids. Of the three studied, the 0.032 IRAS albedos (8) of 368 Haidea and the 0.033 IRAS albedos (8) of 773 Irmintraud are both considered close to the reflectance of the Tagish Lake meteorite. Moreover, even though 368 Haidea was closest spectrally to the Tagish Lake meteorite, 773 Irmintraud was no more than 0.034 AU to a chaotic zone associated with one of the Kirkwood gaps due to the mean motion resonance with Jupiter. This made 773 Irmintraud the closest of the three candidates to the associated chaotic zone and thus the most likely of the three as the source of the 2000 Earth impacted meteorite.
The idea that humans held a piece of the asteroid 773 Irmintraud spurred others to act. In 2002, the University of Tokyo performed near-infrared photometric and spectroscopic observations of 773.Ai, Kanno. (2002) Astronomical Herald [http://sciencelinks.jp/j-east/article/200221/000020022102A0834926.php Photometric and Near-IR Spectroscopic observations of a D-type asteroid, (773) Irmintraud, by SUBARU/IRCS.] {{webarchive|url=https://web.archive.org/web/20111001082405/http://sciencelinks.jp/j-east/article/200221/000020022102A0834926.php |date=2011-10-01 }} VOL.95; NO.11; PAGE.507-514. Accession number: 02A0834926; Japanese language Journal Code: F0543A; ISSN 0374-2466 In addition, the University obtained an accurate lightcurve in Japan through visible photometry and ultimately found a gap between K- and L-band spectra. From this, the university concluded that results support the idea that Tagish Lake meteorite has a link with D-type asteroids.
On May 22, 2007, at 06:07 UT, Irmintraud occulted TYC 4908-00263-1, a 10.7 magnitude star in the constellation Sextans, for observers along a path across New Zealand.Preston, Steve. (May 19, 2007) asteroidoccultation.com [http://www.asteroidoccultation.com/2007_05/0522_773_8584.htm (773) Irmintraud / TYC 4908-00263-1 event on 2007 May 22, 06:07 UT] {{webarchive|url=https://web.archive.org/web/20070507074418/http://www.asteroidoccultation.com/2007_05/0522_773_8584.htm |date=2007-05-07 }} Accessed June 11, 2008.
References
{{reflist|refs=
|author = Hiroi, Takahiro
|author2 = Zolensky, Michael E.
|author3 = Pieters, Carle M.
|date = September 2001
|title = The Tagish Lake Meteorite: A Possible Sample from a D-Type Asteroid
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2001Sci...293.2234H
|journal = Science
|volume = 293
|issue = 5538
|pages = 2234–2236.(SciHomepage)
|bibcode = 2001Sci...293.2234H
|doi = 10.1126/science.1063734
|access-date= 9 December 2015
|pmid=11520950|doi-access= free
}}
|title=Asteroids and comets rotation curves – (773) Irmintraud
|last=Behrend |first=Raoul
|publisher=Geneva Observatory
|url=http://obswww.unige.ch/~behrend/page3cou.html#000773
|access-date=9 December 2015}}
|title=LCDB Data for (773) Irmintraud
|publisher=Asteroid Lightcurve Database (LCDB)
|url=http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=773%7CIrmintraud
|access-date=9 December 2015}}
|type=2015-11-21 last obs.
|title=JPL Small-Body Database Browser: 773 Irmintraud (1913 TV)
|url=https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000773
|publisher=Jet Propulsion Laboratory
|access-date=5 May 2016}}
|title=Dictionary of Minor Planet Names – (773) Irmintraud
|last=Schmadel |first=Lutz D.
|publisher=Springer Berlin Heidelberg
|page=73
|date=2003
|isbn=978-3-540-29925-7
|doi=10.1007/978-3-540-29925-7_774
|chapter=(773) Irmintraud
}}
|title=773 Irmintraud (1913 TV)
|work=Minor Planet Center
|url=https://www.minorplanetcenter.net/db_search/show_object?object_id=773
|access-date=9 December 2015}}
|first1 = E. F. |last1 = Tedesco
|first2 = P. V. |last2 = Noah
|first3 = M. |last3 = Noah
|first4 = S. D. |last4 = Price
|date = October 2004
|title = IRAS Minor Planet Survey V6.0
|url = https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab
|journal = NASA Planetary Data System
|volume = 12
|pages = IRAS-A-FPA-3-RDR-IMPS-V6.0
|bibcode = 2004PDSS...12.....T
|access-date = 22 October 2019}}
|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
|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
|doi-access= free
}} ([http://vizier.cfa.harvard.edu/viz-bin/VizieR-5?-source=J/PASJ/63/1117/acua_v1&Num=773 online], [https://core.ac.uk/download/pdf/43545172.pdf AcuA catalog p. 153])
|display-authors = 5
|author = Masiero, Joseph R.
|author2 = Mainzer, A. K.
|author3 = Grav, T.
|author4 = Bauer, J. M.
|author5 = Cutri, R. M.
|author6 = Nugent, C.
|author7 = Cabrera, M. S.
|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
|access-date= 9 December 2015|arxiv = 1209.5794 }}
|author = Holliday, B.
|date = September 2001
|title = Photometry of Asteroid 773 Irmintraud
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2001MPBu...28...43H
|journal = The Minor Planet Bulletin
|volume = 28
|pages = 43–44
|bibcode = 2001MPBu...28...43H
|access-date= 9 December 2015}}
|author = Warner, Brian D.
|date = September 2006
|title = Asteroid lightcurve analysis at the Palmer Divide Observatory - late 2005 and early 2006
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2006MPBu...33...58W
|journal = The Minor Planet Bulletin
|volume = 33
|issue = 3
|pages = 58–62
|issn = 1052-8091
|bibcode = 2006MPBu...33...58W
|access-date= 9 December 2015}}
|display-authors = 5
|author = Kanno, Ai
|author2 = Hiroi, Takahiro
|author3 = Nakamura, Ryosuke
|author4 = Abe, Masanao
|author5 = Ishiguro, Masateru
|author6 = Hasegawa, Sunao
|author7 = Miyasaka, Seidai
|author8 = Sekiguchi, Tomohiko
|author9 = Terada, Hiroshi
|author10 = Igarashi, George
|date = September 2003
|title = The first detection of water absorption on a D type asteroid
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2003GeoRL..30.1909K
|journal = Geophysical Research Letters
|volume = 30
|issue = 17
|pages = PLA2–1
|bibcode = 2003GeoRL..30.1909K
|doi = 10.1029/2003GL017907
|access-date= 9 December 2015|doi-access = free
}}
}}
External links
- [https://web.archive.org/web/20090801132048/http://pdsproto.jpl.nasa.gov/catalog/target/Results.CFM?resultsselbox=773%20IRMINTRAUD NASA Target Catalog Information] ({{small|archived}})
- [http://www.minorplanetobserver.com/pdolc/A773_2005.HTM Lightcurve plot of 773 Irmintraud], Palmer Divide Observatory, B. D. Warner (2005)
- [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
- [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
- [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
- {{AstDys|773}}
- {{JPL small body}}
{{Minor planets navigator |772 Tanete |number=773 |774 Armor}}
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Category:Discoveries by Franz Kaiser
Category:Natural history of British Columbia