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	Tycho Brahe and Astronomical Tables
		According to his account in the Astronomiae instauratae mechanica (1598), Tycho realised that the positions of the planets agreed with neither the Alphonsine nor the Prutenic Tables whilst still a student in Leipzig.
		It was for this reason that Tycho and his assistants worked to gather observations of the stars and planets, to determine from the reduced data the precise position of the celestial bodies, and to derive from these models of their motion.
		By 1592, Tycho had produced a catalogue of 777 stars, the first new catalogue known to the Latin West since the time of Ptolemy.
	www.hps.cam.ac.uk /starry/tychotables.html (434 words)

	Tycho - Wikipedia, the free encyclopedia
		Tycho Brahe (1546–1601), Tyge Ottesen Brahe, Danish nobleman and astronomer
		Tycho Celchu, a character in the fictional Star Wars Universe
		Brother-Captain Tycho, a character from the fictional Warhammer 40,000 universe
	en.wikipedia.org /wiki/Tycho (116 words)

	[No title] (Site not responding. Last check: 2007-10-30)
		The Hipparcos and Tycho Catalogues This is one of the six CD-ROM sets containing the Hipparcos and Tycho Catalogues: astrometric and photometric star catalogues derived from the ESA Hipparcos Space astrometry mission.
		Contents of the Catalogues: Each of the catalogues includes a large quantity of very high quality astrometric and photometric data, as well as annexes featuring variability and double/multiple star data.
		In the case of the Hipparcos Catalogue, the principal parts are provided in both printed and machine-readable form.
	www.ngdc.noaa.gov /wdc/datalists/astronomy_beijing/catolog/Hip_Tycho.htm (387 words)

	[No title]
		I. The Swift catalogue was compiled from 4 catalogues: Tycho-2, GVCS III, NGC, and the Yale Bright Star Catalogue.
		All catalogues were preprocessed before compiling the Swift catalogue to acheive uniform columns and units.
		This catalogue was added since some of the very brightest stars (i.e., Sirius) seemed to be missing from Tycho-2.
	mssls7.mssl.ucl.ac.uk /swift/docs/swift_catalogue.txt (574 words)

	On Tycho's Island - Cambridge University Press
		Tycho Brahe (1546-1601), the premier patron-practitioner of science in sixteenth-century Europe, established a new role of scientist as administrator, active reformer, and natural philosopher.
		Under Tycho Brahe's leadership, their teamwork achieved breakthroughs in astronomy, scientific method, and research organization that were essential to the birth of modern science.
		On Tycho's Island is a first-rate contribution to Tychonic scholarship and a valuable study in the social history of early modern science.' James R. Voelkel, Johns Hopkins University
	www.cambridge.org /catalogue/catalogue.asp?isbn=052165081X (552 words)

	Hipparcos
		The Hipparcos Catalogue (118 218 entries) and the Tycho Catalogue (1 058 332 entries) - the two catalogues resulting from the Hipparcos space astrometry mission - were both declared final on 8 August 1996, 3 years after the end of satellite operations.
		For the Hipparcos Catalogue, median astrometric accuracies are around 1 milliarcsec; 10% of the objects have accuracies better than about 0.5 milliarcsec; 49 399 of the 118 218 objects have distances determined to better than 20%.
		The general catalogue release was preceeded by the scientific symposium Hipparcos Venice '97, held on Isola di S. Giorgio, Venice, 13-16 May 1997, organised by the Project Scientist and P.L. Bernacca with the support of the Hipparcos Science Team.
	esapub.esrin.esa.it /sp/sp1211/hipparc2.htm (672 words)

	The Hipparcos Space Astrometry Mission: The Hipparcos and Tycho Catalogues
		The catalogues were constructed under the responsibility of large scientific teams collaborating with ESA.
		ESA, 1997, The Hipparcos and Tycho Catalogues, ESA SP-1200
		Selected statistics from the Hipparcos and Tycho Catalogues are available in PDF format for viewing on-line.
	www.rssd.esa.int /SA-general/Projects/Hipparcos/catalog.html (745 words)

	Tycho Catalogue
		Data collected as part of the overall mission of the Hipparcos satellite; it represents a catalogue of position, parallax, proper motion, and magnitude data collected for over one million stars.
		About the only case in which the Tycho data would be ignored would be if Hipparcos data (see Hipparcos Catalogue) is available instead.
		The Tycho data is essentially a survey of all stars that were bright enough to be measured by the detector, and is essentially complete to about magnitude 10.5, with somewhat incomplete coverage to magnitude 11 or 11.5.
	www.daviddarling.info /encyclopedia/T/Tycho_Catalogue.html (174 words)

	OC-OldStarCatalogues (Site not responding. Last check: 2007-10-30)
		Early star catalogues, such as those by Hipparchos, Ptolemy, Ulu-Begh and Tycho Brahe, were compiled from naked-eye observations and contained only stars visible in the northern hemisphere.
		His 1678 catalogue of 300 stars is the first telescopic southern star catalogue.
		Each catalogue was carefully checked for any mention of non-stellar objects, either within the main body of the catalogue, in the footnotes, or the appendices.
	www.saao.ac.za /assa/html/oc-oldstarcatalogues.html (965 words)

	Hipparcos - Wikipedia, the free encyclopedia
		The final Hipparcos Catalogue (120,000 stars with 1 milliarcsec level astrometry) and the final Tycho Catalogue (more than one million stars with 20-30 milliarcsec astrometry and two-colour photometry) were completed in August 1996.
		The catalogues were published by ESA in June 1997.
		The Hipparcos and Tycho data have been used to create the Millennium Star Atlas: an all-sky atlas of one million stars to visual magnitude 11, from the Hipparcos and Tycho Catalogues and 10,000 nonstellar objects included to complement the catalogue data.
	en.wikipedia.org /wiki/Hipparcos (268 words)

	The Tycho Reference Catalogue (Site not responding. Last check: 2007-10-30)
		Comparison with the recent ACT Catalogue which is based on an independent reduction of the same observations as used for constructing the TRC is reported.
		Sect 18.4 of Vol 4 of "The Hipparcos and Tycho Catalogues", ESA SP-1200, 1997).
		The catalogue is sorted according to the GSC region numbers.
	www.cs.wisc.edu /niagara/data/nasa/1250.xml (897 words)

	Catalogue: I/239
		In the case of the Hipparcos Catalogue, the principal parts are provided in both printed and machine-readable form (on CDROM).
		The 'T' flag implies either an inconsistency between the Hipparcos and Tycho catalogues, or a deficiency in one or both of the catalogues.
		Note on Ep-2440000: the measurement epoch is specified in JD with respect to JD(TT)2440000.0 and is corrected to the geocentre.
	vizier.u-strasbg.fr /viz-bin/Cat?I/239 (3982 words)

	Modern catalogues for var-star comparisons
		Transformations from Tycho V to Johnson V are fairly straightforward (as outlined in the printed Volume 1 of the Catalogues) and are consistently applied.
		That is, all the Johnson V magnitudes listed in the Tycho Catalogue are derived from the Tycho V magnitudes as reduced from the direct measurements made by the spacecraft, and as such constitute a homogeneous whole.
		According to the introduction to the catalogues, well over half the stars have Johnson V magnitudes that have been shown to be good to at least +/-0.1 of a magnitude.
	www.britastro.org /vss/jg-tycho.html (3264 words)

	Hipparcos Tycho Catalog (Site not responding. Last check: 2007-10-30)
		The 1,058,332-star Tycho Catalogue is one of the primary products of the European Space Agency's astrometric satellite, Hipparcos, which collected data for four years, from November 1989 to March 1993.
		The Tycho Catalogue can be searched by stycho (which calls scat) and plotted by skymap.
		The ACT catalog combines positions and photometric data from the Tycho Catalog with proper motions computed using earlier epoch positions from the USNO AC2000, and gives better positions away from the Hipparcos epoch, especially for fainter Tycho stars.
	tdc-www.harvard.edu /software/catalogs/tycho.html (243 words)

	ESA Portal - Information Notes - The impact of Hipparcos star-fixing extends to life's evolution (Site not responding. Last check: 2007-10-30)
		The Tycho project progresses from 1,000,000 to 3,000,000 stars The Tycho Catalogue gives the positions of many more stars, so although its accuracy is about one-tenth as good as the Hipparcos Catalogue's, it is the more generous source of greatly improved data for the world's astronomers.
		Russian and German astronomers are now comparing the Tycho results on a million stars with positions of the same stars observed from the ground during the past 100 years, to measure their motions across the sky.
		The Danish astronomer Erik Hog is a worthy heir of Tycho Brahe.
	www.esrin.esa.it /esaCP/Pr_14_1997_i_EN.html (1500 words)

	CANOPUS 97/12 - New and Upcoming Star Catalogue (Site not responding. Last check: 2007-10-30)
		This used to be the catalogue of choice for the northern hemisphere, since it had twice as many stars as the SAO catalogue, and the positions were more accuracte.
		The SAO catalogue was compiled in the 1960s from a large number of sources, reduced as well as possible (at that time) to a common system.
		Obviously, this is not a catalogue to use to make star charts, since the stars are chosen by their distribution, not for an inventory of the sky.
	www.aqua.co.za /assa_jhb/Canopus/c97cSCat.htm (3133 words)

	TYC
		The global data analysis tasks, proceeding from nearly 1000 Gbit of raw satellite data to the final catalogues, was a lengthy and complex process, and was undertaken by the NDAC and FAST Consortia, together responsible for the production of the Hipparcos Catalogue, and the Tycho Consortium, responsible for the production of the Tycho Catalogue.
		Variability of the Tycho measurements: U if apparent variability in the Tycho data, this may be due to duplicity; V if strong evidence of intrinsic variability; W if suspected intrinsic variability.
		Availability of epoch photometry for this object: A indicates epoch photometry given for the stars in the machine-readable Tycho Epoch Photometry Annex A; B indicates epoch photometry not given in the Annex A but in a machine-readable data set, Annex B, containing also the stars from the Annex A. component identifier (1211).
	www.to.astro.it /astrometry/Astrometry/DIRA2/DIRA2_doc/TYC/TYC.HTML (1078 words)

	Remote Access to the Tycho Catalogue and the Tycho Photometric Annex
		Since the Tycho instrument on-board the Hipparcos satellite was operated at a fixed sampling rate (integration time), observations for faint stars are censored, i.e., the magnitude distribution of the observations has a clear cut-off caused by the used SNR limit.
		The catalogue interfaces are responsible for the correct contents of the common structures.
		Since every catalogue has its special contents some of the core routines are also able to provide access to the complete catalogue information for every object on a map produced from the selected catalogue.
	www.cv.nrao.edu /adass/adassVI/wiceneca.html (1631 words)

	TYCHO2 - Tycho-2 Catalog of the 2.5 Million Brightest Stars
		The Tycho-2 Catalogue is an astrometric reference catalog containing positions and proper motions as well as two-colour photometric data for the 2.5 million brightest stars in the sky.
		Mean satellite observation epoch ~J1991.5 Epoch of the Tycho-2 Catalogue J2000.0 Reference system ICRS coincidence with ICRS (1) +/-0.6 mas deviation from inertial (1) +/-0.25 mas/yr Number of entries 2,539,913 Astrometric standard errors (2) V_T < 9 mag 7 mas all stars, positions 60 mas all stars, proper motions 2.5 mas/yr Photometric std.
		A flag which specifies whether or not the star was in the original Tycho Catalog (Tycho-1), where ' ' means that no Tycho-1 star was found within 0.8 arcsec (for the Tycho-1 quality 1-8 stars) or 2.4 arcsec (for the Tycho-1 quality 9 stars), and 'T' means that this is a Tycho-1 star.
	starchild.gsfc.nasa.gov /W3Browse/star-catalog/tycho2.html (2365 words)

	[129.04] The AC 2000.2 Catalogue (Site not responding. Last check: 2007-10-30)
		Due to the early epochs of the data -- averaging 1907 -- and the positional accuracies -- between 150 and 400 milliarcseconds -- the data are extremely valuable in computing proper motions.
		The largest contributor to these proper motions was the re-analyzed Astrographic Catalogue; the latest version being known as the AC 2000.2 Catalogue.
		A description of the AC 2000.2 Catalogue, the reduction techniques used, how it compares with the 1997 version, and information on obtaining the data will be presented.
	www.aas.org /publications/baas/v33n4/aas199/542.htm (311 words)

	Catalogue: I/259
		By means of proper motions the positions are transferred to the year 2000.0, the epoch of the catalogue.
		Tycho-2 is one of the several catalogues used to determine the mean position and proper motion.
		Note (1): The catalogue is sorted according to the GSC region numbers.
	cdsweb.u-strasbg.fr /viz-bin/Cat?I/259 (1834 words)

	The sky in your computer - Planetarium software for MSDOS and Windows (Site not responding. Last check: 2007-10-30)
		Through a great number of parameters it helps to choose specific or automatically what catalogues to use, the color and the dimension of stars and nebulas, the representation of planets, the appearance or not of legend and coordinates, the superposition of images, the visibility conditionses and other characteristics.
		It is needed to separately unload stellar catalogues (for example, catalogue PPM until magnitude 10ª or the catalogue Tycho 2, with more than 2.500.000 of stars) and the data bases of deep sky objects (10,607 objects).
		Nuit: Conceived to combine simplicity and effectiveness, it is directed to the astronomical observation at first and shows to stars until 5ª magnitude, the planets most shining and most of the objects of the catalogue of Messier.
	ret005t6.eresmas.net /english/html/planwin.html (1914 words)

	Cnes - Hipparcos the star collector (Site not responding. Last check: 2007-10-30)
		In the end, 2 star catalogues were in fact compiled: the Hipparcos catalogue, recording data of unprecedented accuracy on some 120,000 stars, and the Tycho catalogue, containing less precise data but covering more than 2.5 million stars.
		Both catalogues will be valuable tools for astronomers worldwide for the next 30 years and beyond.
		The Tycho catalogue is named after the Danish astronomer Tycho Brahe (1546-1601).
	www.cnes.fr /html/_455_472_1732_1736_.php (321 words)

	Interesting astronomical datasets
		Tycho is still far more precise than anything else out there, but it's not quite in the same league with Hipparcos.
		Tycho is now also known as "Tycho-1", since the release of an updated, expanded version in early 2000 that is known as Tycho-2.
		The resulting data is of wonderful quality, with small astrometric residuals suitable for last-minute astrometry to improve occultation predictions and for use in computing the orbit of 433 Eros for the NEAR mission.
	www.projectpluto.com /datasets.htm (4074 words)

	[No title]
		Tycho was the original survey, marking everything within its field of view, and reducing the information to obtain postions, proper motions, parallaxes, and photometry for over a million stars.
		(http://astro.estec.esa.nl/SA-general/Projects/Hipparcos/further_more.html) The telescope used for the Hipparcos catalogue was an optical all-reflective Schmidt.
		The Tycho-2 catalogue has information on the 2.5 million brightest stars in the sky.
	www.sccs.swarthmore.edu /users/03/stonnes/HipparcosandTycho.doc (398 words)

	ESA Science & Technology: Doubling the Hipparcos star count: the Tycho-2 Catalogue
		The Tycho-2 Catalogue, giving positions, motions, brightness and colours of 2 539 913 stars, more than doubles the number of stars in the original Tycho Catalogue.
		Computations from observations by the main instrument generated the Hipparcos Catalogue of 118 218 stars charted with the highest precision.
		The Tycho-2 Catalogue is being made available to the world's astronomers on a CD-ROM, and via the Internet from the Centre de Donnies astronomiques de Strasbourg.
	sci.esa.int /science-e/www/object/index.cfm?fobjectid=12514 (335 words)

	C2A - Tools
		However, in order to make the access to this catalogue easier, it is possible to compact it in order to get a set of files that takes around 160 megabytes on disk (that can be easily stored on a hard disk drive).
		Once the catalogue is fully compiled, put the hierarchy of files on a hard disk drive or on a CD-ROM and specify the access path within C2A by going into the tab "Paths" of the Options dialog box (accessible from the menu "Tools/Options...").
		The UCAC2 catalogue is published by the US Naval Observatory under the form of 3 CD-ROMs that contain 288 files named from Z001 to Z288 as well as 36 files for the Bright Star Supplement names s01 to s36.
	astrosurf.com /c2a/english/tools.htm (1862 words)

	HIPPARCOS
		In the case of the Hipparcos Catalogue, the principal parts have been provided in both printed and machine-readable form (on CD-ROM).
		Although in general only the final reduced and calibrated astrometric and photometric data are provided, some auxiliary files containing results from intermediate stages of the data processing, of relevance for the more-specialized user, have also been retained for publication.
		A fourth scientific consortium, the INCA Consortium, was responsible for the construction of the Hipparcos observing programme, compiling the best-available data for the selected stars before launch into the Hipparcos Input Catalogue (HIC).
	www.to.astro.it /astrometry/Astrometry/DIRA2/DIRA2_doc/HIPPARCOS/HIP.HTML (1040 words)

	Hipparcos and ROSAT Catalogues Accessible to CURSA (Site not responding. Last check: 2007-10-30)
		Versions of the Hipparcos catalogues and the ROSAT All-Sky Survey Bright Source Catalogue [2], have been prepared in a format which is fully compatible with the CURSA package [1] for manipulating catalogues and tables.
		The ACT catalogue is a version of the Tycho catalogue with improved proper motions.
		The ROSAT All-Sky Survey Bright Source Catalogue (RASS-BSC, revision 1RXS) [2] was assembled from the all-sky survey performed by the ROSAT X-ray astronomy satellite (Röntgensatellit) during 1990 and 1991.
	star-www.rl.ac.uk /Bulletin/98apr/node19.html (585 words)

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