... HST . ... HST Overview . ... Changing Programs & Resolving Problems . ... Reference Information on Instrument Performance The following table summarizes the useful wavelength range for each of the first-order gratings of GHRS. ... The following figures illustrate the resolving power as measured for each of GHRS' gratings. ... The nominal design specification for the GHRS was R = 20,000 for the first-order gratings, but in fact one can exceed a resolving power of 25,000 at virtually all wavelengths. ...

These are very prominent absorption lines is most all galaxies. ... These pair of absorption lines will appear in all the spectra and they should be your principle source for determining the redshift. ... When this applet opens you will see an iconic representation of galaxies in the left hand side of the applet and a target area in the right side of the applet. ... Note: What you are doing in this excercise is identical to what Hubble did in the 1920's and you are using the same galaxies. ...

As an example for an observation of a stellar corona, a simulation of the response of RGS was performed. The input spectrum was a two component Mewe-Kaastra plasma, with solar abundance, and temperatures of 0.35 and 2 keV. ... The following image shows an intensity display of the measured spectrum with dispersion coordinate as measured in the spatial dimension on the RGS Focal Camera (RFC) along the abscissa, and the energy response of the CCDs along the ordinate. ...

... The new emission line galaxies are listed in Table 2 containing the following information: . column 1: The object's IAU-type name with the prefix HS. ... This was not corrected in the figure shown in Appendix A. HS1214+3801 : This is seemingly a supergiant H II -region at the very rim of the nearby edge-on disc galaxy (SA(s)cd) NGC 4244 (V hel = 224 kms -1 and B T =10.88). ... To check this option one needs a detailed map of the NGC 4244 velocity field including HS 1214+3801. ...

The database contains references to the papers, data files and links to the Internet resources related to measurements and calculations of the optical constants in the wavelength interval from X-rays to radio domain. ... References to some useful books and reviews on the subject (e.g. the classical handbooks edited by E.D.Palik) and links to Internet collections of optical constants and personal WWW pages with related software were also placed in the database. You have arrived at our welcome page. ...

Follow-up astrometry and recoveries are made with the ANU 40 inch (1.0-m) f/8 reflector at Siding Spring Observatory (IAU code 413). ... A routine follow-up of 2003 WY153 on 2003 Dec 15 became much more than routine when a faint object with unusual motion vector was found close to the target asteroid. ... During routine astrometry with the 1.0-m to improve the orbit of the Apollo asteroid 2004 CB, the asteroid was found on March 30 to have a short tail! ... Siding Spring Survey Main Page . ...

... Let us first find out which way -- rise in spectral resolution with some loss in the S/N ratio or increase in the S/N ratio with a fixed spectral resolution -- is better for the purpose of reduction of equivalent width determination errors. ... N -- number of counts for 1 ? ... line equivalent width, . ... Thus if the spectral resolution is managed to be increased (i.e. to decrease )without loss in the number of counts falling at 1 ?, the equivalent width measurement error is then proportional to . ...

... The power levels during the measurements. ... On 25apr03 the cals were measured using absorber and tracking blank sky. ... See measuring cals on the telescope using sky and absorber for a more detailed description. After taking the data, the spectrum of the cal showed a ripple in polA. ... Blue is cal polA, polb measured using the ratios of the absorber and sky measurements. Fig 2 is the cal value from the absorber and ratio measurement (averaged over each 25Mhz band) with no cum filtering. ...

... ATNF Home . About ATNF . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Australia Telescope User Committee . ... Astrophysics graduate student programs . ... Australian Square Kilometre Array Pathfinder . Murchison Radio-astronomy Observatory . ... Parkes radio telescope . Australia Telescope Compact Array . Mopra radio telescope . ... Visiting Parkes radio telescope . Visiting Australia Telescope Compact Array . ... Parkes radio telescope webcam . ...

... The accuracy of calculation of both INTERBALL spacecraft (SC) motion has been estimated at the IKI. ... The 30 days measuring intervals were used during the Tail probe (TP) orbital data treatment, and 15 days intervals - during the Auroral probe (AP) orbit determination. ... http://www.iki.rssi.ru/vprokhor/indap.htm for the Auroral probe; . http://www.iki.rssi.ru/vprokhor/indtp.htm for the Tail probe . ... http://www.iki.rssi.ru/vprokhor/ssc.htm , or http://www.iki.rssi.ru/vprokhor/amisan.htm . ...

Gerry Doyle's homepage . Watch this space!

Astronomy Discussion Forums . Forums: . ... Discussion Forums . ... You Followed The Apology With The Same Foolish Insult . Forum List | Follow Ups | Post Message | ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... Dear FIRPO friends, I have quickly looked at the data freshly sent by Bringfried after his run at the 1.23m in the current situation of "poor" (to say the least) mirror. I have measured the SNR on two stars: V Sp K(assumed) SNR ------------------------------- 7.9 K4/5 4.5? ... For comparison, my experience from two seasons ago at the 1.23m was that the limit was K=7.5 for SNR=1. So at least for faint stars, it seems that the situation with the mirror does not preclude useful work. ...

... The following table gives the sensitivity of field center, distortion, and image size to various misalignments of the optical elements in the 2.5 m telescope. ... The repointing is done so as to keep the center of the focal plane pointed to the same position on the sky. ... Field shift (this is the mean shift in object positions in the focal plane before repointing the telescope) . ... Image properties are measured for an array of points in the focal plane. ...

... Sighting the telescope, first at the tree and then at pole B, you measure the angle A of the triangle ABC, equal to the difference between the numbers you have read from the azimuth plate.. ... Why triangles? ... One large surveying project of the 1800s was the " Great Trigonometric Survey " of British India. ... Everest was the one who commisioned and first used those giant theodolites; they are now on display in the Museum of the Survey of India in Dehra Dum. ... Everest . ...

... ESO Science Newsletter November 2015 . 18 Nov 2015 . ... This newsletter is a summary of recent ESO Science Announcement items. Follow the links or visit ESO Science Announcements to read more. ... An integral part of the commissioning of a new instrument at the VLT is the Science Verification ( SV ) phase. ... Joint ESO, ALMA, NAOJ, NRAO Workshop: . ... Science Operations 2015: Science Data Management . ESO/ESA Workshop, ESO Headquarters, Garching, Germany, 24тАУ27 November 2015 . ...

Astronotes Armagh Planetarium's Stellar Blog! ... Stars . ... Space Flight . ... Some 13.7 billion years ago, a mere millionth of a second after the Big Bang, the first hydrogen and helium nuclei condensed out of a hot, dense soup of quarks and gluons. ... In the very last few kilometres some of the light was scattered by a myriad of water droplets (containing hydrogen nuclei which had existed almost since the Big Bang) slowly descending through the air following a rainshower. ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. October 21, 1999 . Follow The Spots . Credit: Louis Strous ( LMSAL ), SOHO - MDI Consortium, ESA , NASA . ... Just follow the sunspots . ... It shows the Sun's visible surface for most days of August 1999 so that the same sunspots appear many times as the solar rotation carries them across the face of the Sun . ... About APOD > . ...

Astronomy Picture of the Day . ... 21.10.1999 . ... Credit Copyright: Louis Strous ( LMSAL ), SOHO - MDI Consortium, ESA , NASA Explanation: The Sun rotates on its axis about once every 27 days. ... Just follow the sunspots . ... It shows the Sun's visible surface for most days of August 1999 so that the same sunspots appear many times as the solar rotation carries them across the face of the Sun . ... October 1999 . ... 1999 2000 . ... Publications with keywords: Sun - solar rotation - sunspot . ...

... 237S (SIMBAD/NED BibCode) ================================================================================ Keywords: Sun: UV radiation - atmospheric effects - Sun: atmosphere - lines: identification Description: An ultraviolet atlas of the solar spectrum with a spectral resolution of 15mA in the region 1948-2000A is presented. ... The wavelength atlas with a list of about 550 lines has been synthesized from data at center of the Sun ({mu}=1) and at {mu}=0.89, smoothed out over an area of 30 arcsec. ...