RECREATIONAL TELESCOPES . ... ASTRONOMICAL TELESCOPES . ... Home Products Telescopes Astronomical Telescopes ASTELE™ 152MN . ... Whatever eyepiece you're using at the time is your finder eyepiece. ... 152MN is 4.4, so, unlike telescopes with much longer ?-ratios, you're able to use low magnification (27.4 X, 2.3° with the 25 mm PlЖssl eyepiece) which produces bright images and wide fields of view for those dim galaxies, nebulae, and very large star clusters, but the ASTELE? ... BK7 optical glass . ...

... WFC3 . ... ISR 2015-03: WFC3/UVIS Charge Transfer Efficiency 2009 - 2015 . ... ISR 2009-45: WFC3 SMOV Programs 11424, 11434: UVIS Channel On-orbit Alignment . ... ISR 2009-23: WFC3 SMOV Program 11420: IR Channel Functional Tests . ... ISR 2009-22: WFC3 SMOV Proposal 11421: Channel Select Mechanism Test . ... ISR 2009-03: WFC3 TV3 Testing: UVIS-1' Crosstalk . ... ISR 2008-21: WFC3 TV3 Testing: UVIS Channel Calibration Subsystem Performance . ... ISR 2008-07: WFC3 TV3 Testing: UVIS Channel Glints . ...

... Observing springtime deep-sky objects with a large telescope . ... Buy and sell astronomy gear April 9 . ... Astronomy.com: Jim Forbes . ... A refracting telescope makes use of this property with a carefully made lens having curved surfaces. ... The first telescope (of any type) was constructed by the Dutch spectacle maker Hans Lippershey (1570 1619) who, on October 2, 1608, filed a patent application for "an instrument for seeing faraway things as though nearby." ... Buying your first telescope . ...

п'? . PubliГї le 20/06/2010 par JГїrГ?me BГїguin . Date : 29/07/2009 . Lieu : Epidaure / GrГЕce . MatГїriel de prise de vue : Equinox 80ED + skyview pro + 350D non dГїfiltrГї, pas d'auto-guidage . Commentaires : Compilation de 25 images et de 8 dark avec DeepSky Stacker pour un total de 37 minutes.

The oral histories on this Website are the transcripts from audio-recorded, personal interviews with many who pioneered outer space and the Moon, and with those who continue the excitement of space exploration. ... To continue, choose a link below: . Michael L. Coats Oral History Interviews . April 16 , 2008 . HTML . PDF 85K . January 4, 2008 (NASA at 50) . ... PDF 77K . ... PDF 32K . Return to NASA at 50 Oral History Website . Return to JSC Oral History Website . ...

OptInt PmWiki : MROI / P 4 S . We have received a ROM cost from IC Optical Systems, based on a verbal coating spec. ... lambda/10 flatness but we asked for lambda/20 . ... JC will send a preliminary coating spec to SESO, in order to elicit a comparable ROM estimate. ... 2333_ROM_PupilPlaneCom_JCoyne_Cavendish.pdf ... 114,933 bytes .. May 04, 2007, at 10:24 AM . ... Printable View of http://www.mrao.cam.ac.uk/projects/OAS/pmwiki/pmwiki.php/MROI/P4S) ...

... Near-infrared Integral-Field Sp ectrograph ( NIFS ): An Instrument Prop osed for Gemini Peter J. McGregor, Peter Conroy, Gabe Bloxham and Jan van Harmelen Research School of Astronomy and Astrophysics, Institute of Advanced ... gabe@mso.anu.edu.au, jan@mso.anu.edu.au Received 1999 March 11, accepted 1999 July 15 Abstract: In late 1998 the International Gemini Pro ject Office identified a need for a low cost, near-infrared spectrograph to be commissioned on the ...

Next: Tapes Up: Using Disks and Other Previous: Floppies . A CD-ROM drive uses an optically read, plastic coated disk. ... CD-ROM drives are slow compared to hard disks. ... The slowness means that CD-ROM drives are not as pleasant to use instead of hard disks (some Linux distributions provide `live' filesystems on CD-ROM's, making it unnecessary to copy the files to the hard disk, making installation easier and saving a lot of hard disk space), although it is still possible. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Meteors and Meteorites . ... Monthly Sky Notes . ... November . ... Observers can expect around 10 meteors an hour on the night of the peak, although every 33 years the Leonids experience a phase of increased activity as their parent comet passes the Earth once again. ... Around€а 14 November, the€а faint and difficult to see Andromedids will be gracing the nightтАЩs sky although this may be in the range of about 3 meteors an hour. ...

... Primary Mirror after being stripped and recoated in 3-layer protected silver (NiCr-Ag-NiCr) on 12 September 2009. image: CIMG7901.jpg . ... Primary Mirror held by (yellow) handling tool being lifted off transport container (note the tennis balls it rested on), to be put on wash cart during unpacking at VISTA on 29 March 2008. image: P1060207.jpg (taken 29/03/08) . ... VISTA Mirror Blank: Shape of 4m primary mirror blank being tested at Schott Glas in Germany. image: M1_shape_checking-300dpi.jpg . ...

... Mario Motta M.D. Goddard Space Center . ... Mario Motta M.D. Harvard Solar Observing Day CfA April 19 2015 . ... Hobby-Eberly 11 Meter Telescope . ... Lowell Observatory . ... William Lee . Marrett Pines Observatory Construction . ... Plum "Observatory" . ... Visit to the LBTO Observatory . ... Mario Motta M.D. William Knight Observatory . ... Wingaersheek Observatory . ... Mario Motta M.D. Picture Galleries . ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

... Home Articles Observing Resources for Amateur Astronomers ? Part 1: Beginning Observers Observing Resources for Amateur Astronomers ? Part 3: Advanced Observers . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . Observing Resources for Amateur Astronomers - Part 2: Intermediate Observers . Observing Resources for Amateur Astronomers - Part 3: Advanced Observers . Observing Resources for Amateur Astronomers - Part 4: Magazines and Miscellany . ...

... Imaging GRIN Rod Lens (HAG's) | Relay Rod Lens (LAG's) | ... The Refractive Index Distributions (RID) in GRIN lens preforms are made by multi-stage optimized ion-exchange diffusion between silicate mineral glasses and salt melts. ... In the LAG lenses - L ow A perture GRIN the nature of the changing of refractive index in glass via ion-exchange lies mainly in molecular volume increase. ... LAG lenses are specially treated to create the dark anti-flick surface coating (Fig.2). ...

... Thus all regions of the 0.94-2.50 micron wavelength range accessible from Mauna Kea can be recorded using five fixed angle gratings. ... Grating Angle . ... Efficiencies for the NIFS gratings are shown above. The NIFS spectrograph uses a Bouwers collimator and a refractive camera. ... With these assumptions, the NIFS system efficiency including the Gemini telescope optics but excluding the transmission of the adaptive optics system is about 0.17 e - /photon at J , and 0.22 e - /photon at H and K . ...

... We propose a set of standard character strings to be used in FITS files generated by data from the ALEXIS (Array of Low Energy X-ray Imaging Sensors) satellite mission. ... The following is our current proposal for keywords to use for storing raw and processed ALEXIS mission data in FITS format. TELESCOP= 'ALEXIS ' . ... In migrating these existing files to FITS formats, we propose the following non-inclusive list of generic column headers (these will be of the form TTYPE n = ' header ' ). ...

The following papers summarize the characterization and technical performance of IBIS : . ... Characterization of Fabry-Perot interferometers and multi-etalon transmission profiles. ... Righini, A., Cavallini, F., Reardon, K. P., 2010, Astronomy and Astrophysics , 515 , A85, . ... The filter wheel is located between the two interferometers. ... The interferometers can be rapidly tuned, simultaneously, so to allow sequential scanning of the spectral lines of interest (see movie in IBIS Intro ). ...