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Topic: Astrograph

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	Astrograph - Wikipedia, the free encyclopedia
		A 13-inch, f/5.3 astrograph at Lowell Observatory (a refractor with a 3 element lens) that was used in the discovery of Pluto.
		Astrographs are usually used in wide field surveys of the night sky as well as detection of objects such as asteroids, meteors, and comets.
		The main parameters of an Astrograph are the diameter and f-ratio of the objective which determine the field of view and image scale on the photographic plate or CCD detector.
	en.wikipedia.org /wiki/Astrograph (715 words)

	20-inch Carnegie Double Astrograph
		The 20-inch Double Astrograph is a unique wide-angle photographic camera, specially designed for the historic Lick Northern Proper Motion survey, a mammoth photographic survey of the northern sky carried out over half a century by four generations of Lick astronomers.
		A double astrograph is the optimal telescope to survey large areas of the sky accurately and efficiently.
		Astrographic refractors not only provide a wide field of view; they also have an optical design that projects the sky accurately onto the flat photographic plates.
	www.ucolick.org /public/telescopes/astrograph.html (1457 words)

	Astrograph.html
		The principal telescope of the Cesco Observatory is a Double Astrograph consisting of two lenses each 51-cm in diameter, one optically corrected for blue light and the other for yellow light.
		The effective passbands for the YSO lenses are then 410-480-nm for the blue and 520-570-nm for the yellow, with minimum foci at 435-nm and 535-nm, respectively.
		The YSO astrograph has two guide telescopes, one for visually setting the telescope on the field, and another equipped with an image-dissector autoguider whose electronics were designed and constructed at Lick following the design of their autoguider.
	www.astro.yale.edu /astrom/Astrograph.html (568 words)

	The 4x5 Astrograph
		Peter had the year before built a large astrograph for use with medium format film, and this instrument was used to produce his famous comet video.
		Perhaps the most critical aspect of the entire astrograph is the placement of the focusing plane of the ground glass, which has to be at exactly the same plane as the film in the holder.
		To achive this a sheet of flim is placed in the film holder, a micrometer is used to measure the dpth to the film plane, and then Dave built and assembled the ground glass holder at exactly the same depth.
	www.start.ca /users/joneil/astrgph.html (1825 words)

	Bill Keel's Telescope Life List - Lick Observatory
		The domes of the original 36" refractor (left, in the main building) and 120" Shane reflector (right) are most prominent, with the Crossley telescope on the ridge to the lower left of the main building and the double astrograph to the immediate left of the Shane telescope.
		The Carnegie double astrograph was built for a single dedicated project - a long-term astrometric study of vast numbers of stars, using distant, faint galaxies as an inertial reference frame.
		These included pictures of M31 (1 hour on 103a-O emulsion, blue astrograph - stick with the classics, we thought), and later a field around the double QSO 0957+561 including the edge-on spiral NGC 3079 (1 hour on 103a-G with the yellow lens through cirrus), showing the multiple images produced by the objective gratings.
	www.astr.ua.edu /keel/telescopes/lick.html (1427 words)

	astrograph
		This article describes how to make an Astrograph that can be taken out into the country and used on a car roof, or any flat stable surface.
		Adjust the position of one of the eyes until the ruler is parallel to the centre of the hinges.
		Adjust the Astrograph until the pole (not the pole star) is in the centre of both of them (see Fig9).
	www.lincolnastrosoc.freeserve.co.uk /astrograph.html (1186 words)

	CCD Astrometry with the USNO Redlens Astrograph (Site not responding. Last check: 2007-09-07)
		Since the mid--1970s, the US Naval Observatory has operated an eight-inch double astrograph using lenses corrected for the yellow and blue spectral bandpass respectively.
		The telescope has recently been modified using the yellow lens as the guidescope and replacing the blue lens with a new five--element red lens.
		Built originally to use 8" by 10" photographic plates with a field of 5 by 5.5 degrees, the astrograph has been equiped with a Kodak 1552x1024 pixel CCD camera (pixel size of 9 \mu m x 9 \mu m) and 16 bit readout.
	www.aas.org /publications/baas/v27n4/aas187/S014004.html (275 words)

	spot diagrams of corrected Newtonian Astrograph versus uncorrected Ricthey Chretien
		The Dream Astrograph with 3" coma corrector is on the left of the teal colored "football." The smaller box is 20 microns square and the larger, outer box is 100 microns square.
		The RC's spot diagram (the large, teal "football") is in the center of the 100 micron square box.
		The Dream Astrograph's RMS radius at this location is 3.3 microns.
	www.dreamscopes.com /pages/06/AstrographN-01.htm (199 words)

	extrag; (Site not responding. Last check: 2007-09-07)
		This astrograph was built around a WWII vintage lens offered for sale by an individual on sci.astro.amateur.
		The astrograph has a 4 x 5 film back but the field is restricted to a 2.5" circle of optimum quality, providing a field of about 7 degrees.
		The astrograph is mounted in the rings normally used for a guide scope and guiding is done through the 10".
	user.mc.net /arf/astrog.htm (349 words)

	CCDsystem.
		The focus sensors are based on a new design, which incorporates a Hartmann mask in the astrograph's converging f/7.3 beam.
		A simple Hartmann-mask algorithm analyzes the observed relative image positions, determines the optimum focus and reports that value to the observer who decides whether or not it is necessary to refocus either the blue or yellow cameras.
		As diagnostic aids for the interpretation of the observations, we have installed a NovaLynx weather station with temperatature, pressure, relative humidity, wind speed and direction computer inputs as well as additional precision temperature sensors at the astrograph lenses, cameras and external telescope points.
	www.astro.yale.edu /astrom/ccdsystem.html (560 words)

	East Valley Astronomy Club - Telescopes
		Takahashi elected to use the helical focuser on this F/3 astrograph in order to facilitate obtaining the precise focus required of short focal ratio optical instruments.
		Closest to the optical tube assembly is the third and largest dial, which allows the user to orient the camera at any angle without disturbing the final focus.
		This astrograph can be used for visual observation, but it is clearly designed for photography.
	www.eastvalleyastronomy.org /reviews/tak-e210.html (1008 words)

	Dream Astrograph optical quality and benefits of design
		The effective focal ratio of a 16" f3.75 Dream Astrograph with 34% central obstruction is f4.0.
		If the Dream Astrograph had a 50% central obstruction, like an average RC, its effective focal ratio would be f4.3.
		It also means that in certain Dream Astrograph sizes expensive mounts are not a requirement.
	www.dreamscopes.com /pages/06/AstrographN-opticsAdvantage.htm (1558 words)

	Photo astrograph for digital photography (Site not responding. Last check: 2007-09-07)
		Optical system is designed to pass the light through a corrector first and then is reflected from a primary mirror.
		This photo astrograph is built for digital cameras (Canon, Nikon), CCD and the design field diameter is 28 mm.
		This photo astrograph is built for digital cameras (Canon, Nikon), or CCD cameras.
	www.volny.cz /modr1/english/komory.html (170 words)

	Data Structure and Software of the UCAC-S Project
		The USNO CCD Astrograph Catalog South (UCAC-S) project is a high precision astrometric survey of the entire southern hemisphere for the 7-16 magnitude range, aiming at an accuracy of 20 mas for 8-14
		A 4k x 4k CCD is used at the back-end of a 5-element, 0.2 meter aperture astrograph.
		The USNO CCD Astrograph Catalog South (UCAC-S) project is a high precision astrometric survey of the entire southern hemisphere for the 7-16 magnitude range in a single bandpass (610/60 nm), (Gauss et al.
	www.adass.org /adass/proceedings/adass98/zachariasn (760 words)

	Intes-Micro M606 Maksutov-Cassegrain Astrograph - Review
		The astrograph is a 152mm f/6 Mak-Cass of Simak design.
		The silvered spot on the meniscus, which serves as the secondary mirror in a classic Maksutov, is in this case replaced by a secondary mirror held in a three-vaned spider at the midpoint of the tube.
		That astrograph has immaculate fit and finish and outperforms the M606 with an f/4 focal ratio.
	www.cloudynights.com /item.php?item_id=1521 (2185 words)

	Anacortes Telescope & Wild Bird - Astronomy / Telescopes / Astrograph
		One of the fundamental cornerstones of Borg's scope designs has been excellence in performance as astrographs - high-performance objectives combined with uniquely high-performance flattener/reducer elements, specially designed for imaging.
		This first addition to the new Epsilon Series introduces the newly designed ED corrector and fast speed of f/2.8.
		This fast field photo/visual astrograph is perfect for digital 35mm cameras and CCD cameras.
	www.buytelescopes.com /product_list.asp?t=8 (614 words)

	Observing Site (Site not responding. Last check: 2007-09-07)
		In 1970, funds from the Lowell endowment were used to construct a new 24 foot diameter dome on Anderson Mesa.
		The instrument was moved to Anderson Mesa because the bright lights of the growing city of Flagstaff had made the it ineffective in its original location.
		Between 1970 and 1992, the Astrograph was used initially by Dr. Henry Giclas for a proper motion survey of the stars.
	www.lowell.edu /users/elgb/observing_site.html (329 words)

	Takahashi Astrographs
		This super-fast, 7" astrograph has a cutting edge, state of the art ED corrector.
		Perfect for use with CCD cameras and 35mm digital SLR cameras.
		This astrograph will produce 10 micron stars across the entire field.
	www.handsonoptics.com /tak_astrographs.html (36 words)

	Messier 33 Showing van Maanen's Comparison Stars - Pilato
		The tweaking was done with respect to Humason's 1922 astrograph, using least squares fitting.
		A NADS copy of Ritchey's 1910 M33 astrograph, published by Edwin Hubble in 1926(2), is used to show those locations.
		A Hale Observatories color astrograph made in 1980 or earlier shows object No. 367 (the fast mover) in an intermediate position between its 1910 and 2003 positions.
	www.datasync.com /~rsf1/m33PR51.htm (585 words)

	The UCAC Astrometric Survey
		The USNO CCD Astrograph Catalog (UCAC) project is a high precision, astrometric survey.
		The observations are made with a 0.2m, 5-element astrograph (Table 1) equipped with a 4k by 4k CCD camera (Table 2).
		The observing strategy gives a mean density of about 2000 stars per square degree, higher than that of the Guide Star Catalog (GSC), with an improvement in positional accuracy of about a factor of 10.
	www.adass.org /adass/proceedings/adass99/P1-07 (695 words)

	C20
		chievement: The C20 Astrograph is the first telescope system of its kind ever offered by a large commercial telescope manufacturer.
		After evaluating numerous design options, Celestron’s solution to the design of this instrument is a 20” (1/2 meter) diameter f/6.8 field-corrected, modified Dall-Kirkham optical assembly that is mounted on a newly designed, massive observatory-class computerized German Equatorial mount.
		The tracking accuracy with this observatory-class mount is better than 5 arcseconds peak to valley without enabling the PEC function.
	www.kansaswindpower.net /c20.htm (1078 words)

	Telescope
		The 20" homebuilt Newtonian Astrograph OTA shown and described here is now at Stellafane in Springfield, Vermont.
		It was very gratifying to be able to provide this instrument to a super group of people that make up the Springfield Telescope Makers and who are committed to keep alive the excitement and challenge of making one's own telescope.
		Slotted for installation at some time in the future either in the McGregor Observatory or a separate observatory the OTA will bear the same inscription as the famous Pink Clubhouse built by Russell Porter on Breezy Hill when Stellafane was founded.
	www.heavensgloryobservatory.com /telescope.htm (1277 words)

	Llano del Hato National Astronomical Observatory - Wikipedia, the free encyclopedia
		The Llano del Hato National Astronomical Observatory (Observatorio Nacional de Llano del Hato) is an observatory in Venezuela, run by the Centro de Investigaciones de Astronomia (CIDA).
		It is 3600 metres above sea level and comprises four telescopes, each in their own cupola: a Schmidt camera, a reflecting telescope, a great refractor, and a double astrograph.
		The facility has four large optical telescopes, a Zeiss refractor, a large Zeiss reflector and, for dedicated photographic applications, an Askania astrograph and an Askania Schmidt camera.
	en.wikipedia.org /wiki/Observatorio_Nacional_de_Llano_del_Hato (320 words)

	Main Astronomical Observatory of National Academy of Sciences of Ukraine (Site not responding. Last check: 2007-09-07)
		The Observatory was planned as an astrometric institution, and its first telescopes were the Wanschaff vertical circle (D=19 cm, F=2.5 m) and the Tepfer double long-focus astrograph (D=40 cm, F=5.5 m).
		The Wanschaff vertical circle (D=19 cm, F=250 cm) was used for determining absolute declination of stars and planets.
		As years went by, the field of investigations widened, new telescopes were installed: small solar telescope with a spectrograph (1954), chromospheric telescope (1957), reflector AZT-2 (D=70 cm) in 1959, horisontal solar telescope ATsU-5 (D=44.5 cm, F=17 m) in 1965, Zeiss double wide-angle astrograph (D=40 cm, F=2 m) in 1975.
	www.mao.kiev.ua /eng/telescopes_e.html (259 words)

	Astrology Software from AstroGraph :: Free Monthly Horoscope
		The Astrology of December represents a time of transition, when all the personal planets change signs, and when the signs of Sagittarius and Capricorn and their rulers Jupiter and Saturn are emphasized in particular.
		You can log in to My AstroGraph, or sign up for a new account for a free calculation and interpretation of your Sun Sign, Moon Sign, and Rising Sign.
		Please note that dates given in this column for astrological events are based on U.S. Pacific Time Zone (UTC +8), for other locations dates may need to be adjusted depending on the number of hours of separation.
	www.astrograph.com /sunsigns.php (1158 words)

	[53.03] The first US Naval Observatory CCD Astrograph Catalog (Site not responding. Last check: 2007-09-07)
		The USNO CCD Astrograph Catalog (UCAC) project is a high precision, astrometric survey of stars having R magnitudes between 7th and 16th.
		Observations began in January 1998 at Cerro Tololo Inter--American Observatory (CTIO) using a five-element 0.2 meter astrograph equipped with a 4k by 4k CCD.
		The instrument will be moved north in early 2001, and full sky coverage is expected by early 2003.
	www.aas.org /publications/baas/v32n2/aas196/437.htm (244 words)

	SSP - Summer Science Program
		Students use both an astrograph -- telescope designed for sheet-film astrophotography -- and a CCD-equipped telescope.
		They guide the astrograph manually (using a paddle) through exposures ranging from 10 to 20 minutes, then develop the 4x5 inch sheets of film in a photographic darkroom.
		Digital images are much briefer, so manual guiding isn't necessary; the telescope and camera are controlled by The Sky 6 Professional and CCDSoft software (both generously donated by Software Bisque).
	www.summerscience.org /program/orbit.php (472 words)

	Astromart Auctions - Takahashi FRC-300 Astrograph
		The FRC-300 is the newest flat field Ritchey-Chretien produced by Takahashi.
		This newest flat field astrograph is designed to produce a flat 90Ø image circle for medium format photography or CCD imagery.
		This image circle can be used with the largest available CCD cameras for many years to come.
	www.astromart.com /auctions/details.asp?auction_id=1859 (171 words)

	nmazca.blog : embedded in the floating world
		I noticed the search string "bush astrograph" in the log file for nmazca.com a couple days ago.
		Someone was looking for that information and connected to my site, although I don't have that info anywhere...
		I followed up on it last night and found (not surprisingly) that it's already been done by Astrograph:
	nmazca.com /blog/2003/11/bush-astrograph.htm (207 words)

	USNO CCD Astrograph Catalog
		The history of other news notes has been relocated to a separate page.
		to NOFS, Flagstaff, AZ Details of the astrograph and camera.
		The USNO astrograph at Cerro Tololo, Chile - some pictures.
	ad.usno.navy.mil /ucac (614 words)

	Celestron - C20 Astrograph with Portable Pier - Model Number: CE-11095 - $42,500.00
		To design, engineer, and manufacture the finest large aperture optical system possible for both imaging and visual observation without any design or cost constraints.
		The C20 Astrograph is the first telescope system of its kind ever offered by a large commercial telescope manufacturer.
		Call us at 1 (800) 483-6287 or email us for more information or to place your order.
	www.optcorp.com /product.aspx?pid=3704 (598 words)

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