... NGC 4414: A Telling Spiral . ... the Hubble Heritage Team ( AURA / STScI / NASA ) Explanation: How far away is this galaxy? ... Spiral galaxy NGC 4414 contains many Cepheid variable stars that oscillate in a way that allows astronomers to estimate their distance. From analyzing distances to galaxies like this, some astronomers have recently announced that they have again refined their estimate of the expansion rate of the universe . ... NASA Web Site Statements, Warnings, and Disclaimers . ...

... Tonight's Sky . ... Search By Name Enter coordinates Use current location . ... Observing . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... How do astronomers use Cepheid variables to measure distances? ... Get instant access to subscriber content on Astronomy.com! ... If you are already registered on Astronomy.com, please log in below. ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... June 9, 1999 . NGC 4414: A Telling Spiral . ... the Hubble Heritage Team ( AURA / STScI / NASA ) . Explanation: How far away is this galaxy? ... Spiral galaxy NGC 4414 contains many Cepheid variable stars that oscillate in a way that allows astronomers to estimate their distance. ... NGC 4414 shows many classic spiral galaxy features, including thick dust lanes , a central region rich in old red stars, and winding spiral arms glowing with young blue stars. ... About APOD > . ...

... Posts tagged ?incompleteness? ... Comment . ... The notions of missing data are overall different between two communities. ... Astronomers?I?m not sure how they think but my impression so far is that a missing value in one attribute/variable from a object/observation/informant, all other attributes related to that object become useless because that object is not considered in scientific data analysis or model evaluation process. ... 2 Comments . ... Entries RSS . ... Entries (RSS) and Comments (RSS)...

GCVS Research Group: . Recent publications . Kazarovets E.V., Samus N.N., Durlevich O.V., Kireeva N.N., Pastukhova E.N., The 81st Name-List of Variable Stars. ... Kazarovets E.V., Samus N.N., Durlevich O.V., Kireeva N.N., Pastukhova E.N., The 80th Name-List of Variable Stars. ... Samus N.N., Kazarovets E.V., Kireeva N.N., Pastukhova E.N., Durlevich O.V. General Catalogue of Variable Stars: Current status and new Name-lists Odessa Astronomical Publications, 2010, V. 23, p. 102-105. ...

... authors (intermediate) This page describes the "variables" that are associated with pages. Page variables have the form {$ variable } , and can be used in page markup or in certain formatting strings in PmWiki . ... The page variables defined for PmWiki are: . Group} - page's group name, as in "PmWiki" . ... Title} - page title (may differ from Name), as in "Page-specific Variables" . ... PageUrl} - page's url, as in " http://www.atnf.csiro.au/vlbi/wiki/index.php?n=PmWiki.PageVariables " . ...

HUBBLE SPACE TELESCOPE DAILY REPORT #1169 PERIOD COVERED: 0700 EST Daily Status Report as of 179/1200Z. 1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED: 1.1 Completed WF/PC-2 5397 (Determination fo the Extragalactic Distance Scale: Cycle 4 High) The WF/PC-2 was used to make images of galaxy NGC-7331 to be used in measuring the periods of Cepheid variable stars within this galaxy. The images were received and displayed. ... The second observation was executed as scheduled, and no anomalies were noted. ...

... The SAS_ODF environment variable shall be set to the summary file produced by odfingest , or to a directory containing the data, and access to calibration files shall be set through cifbuild . ... step 3 The count rates of tracking stars are written into a file. omthconv thxset =/path_to_your_data/proc/I0125321001OMS006TRHIS0000.FIT nphset =/path_to_your_data/0644_0125321001_OMX00000NPH.FIT outset =/path_to_your_data/proc/P0125321001OMS006TSTRTS000.FIT . ... A sky image (North on top) is produced. ...

... Star Clusters . ... Stars@ESO . ... By discovering the first double star where a pulsating Cepheid variable and another star pass in front of one another, an international team of astronomers has solved a decades-old mystery. ... This embarrassing discrepancy has been known since the 1960s. To resolve this mystery, astronomers needed to find a double star containing a Cepheid where the orbit happened to be seen edge-on from Earth. ... It contains a Cepheid variable star pulsating every 3.8 days. ...

Dr John Butler fine tuning the recently restored Calver telescope at Armagh Observatory. Image courtesy Miruna Popescu) Dr John Butler, recently retired research astronomer at the Armagh Observatory, has been awarded the MBE in the Queen's Birthday Honours, for services to science. ... John worked for a number of years at Dunsink Observatory, Dublin before joining the staff of the Armagh Observatory in 1973. ... A Short History of Armagh Observatory by C.J. Butler . ...

OptInt PmWiki : Pm Wiki / I18n Variables . ... This page describes the variables used by PmWiki for Internationalizations (i18n). ... An array which contains the PageNames where you can find lists (trails) of pages containing variable definitions. ... An array (hash) which contains pairs of language identifiers and translation hashes. ... Thus, it is essentially a multi-lingual dictionary used for phrase translation. ... An array that contains the names of the currently active language definitions. ...

Filename completion is only available if the the environment variables EDITOR and/or VISUAL are set to either emacs , gmacs or vi . For example: EDITOR=emacs . ... To complete a file or directory name with emacs or gmacs set press the ESC key twice. ls -l on<ESC><ESC> line_help . If the filename is not completed enter more characters until the filename can be uniquely identified. ... To complete a file or directory name with vi set press the \ (backward slash) key. ls -l on\ line_help . ...

... Stars . ... Cepheid variable stars have been known since the 18th century. ... Regularly brightening to a peak over days, weeks or months before fading these variable stars were remarkable curiosities to astronomers in past centuries.€а The term Cepheid is taken from the star Delta Cephei in the constellation of Cepheus, which was identified as variable€а in 1784 by the teenaged prodigy John Goodricke (1764-96). ... Tweets that mention Cepheids: Inconstant Stars which break the rules | ...

... CEPHEID VARIABLE STARS: A Cepheid variable or Cepheid is a member of a particular class of very luminous, massive variable stars with pulsation periods of 1-70 days. ... The relationship is calibrated using data collected from Cepheids whose distances are determined by other means. ... Browse through the 68 CCD fits images he sent you, using ds9 and locate the Cepheid variable. ... Image credits: ESA - "http://sci.esa.int/science-e-media/img/20/cepheid-variables.jpg" . ...

... LWN.net Weekly Edition for March 18, 2004 . ... LWN.net FAQ . ... This article is part of the LWN Porting Drivers to 2.6 series . Completions are a simple synchronization mechanism that is preferable to sleeping and waking up in some situations. ... When your driver begins some process whose completion must be waited for, it's simply a matter of passing your completion event to wait_for_completion() : . ... void complete(struct completion *comp); void complete_all(struct completion *comp); . ...

Contents and Select Excerpts . ... Spring 2008 . This page contains the table of contents and select excerpts only and is not a complete reproduction of this issue. Complete content for online Mercury is available to ASP members and institutional subscribers . ... Sharing Astronomy with the World, Mike Simmons . Astronomy connects us in a way no other science can. ... GLAST: Exploring the Extreme Universe, Robert Naeye and David J. Thompson . ... Editorial, Paul Deans . ...

Supernova 2002fk in NGC 1309 . This page is devoted to information on Supernova 2002fk in NGC 1309 Basic information on this SN, including the last reported brightness, on this Supernova can be found on the main page . Information on the original web pages for many of these images can be found on the updates and links web pages. ... 2002/09/19.848 . ... JM Llapasset image . ... 13.0 . ... Josep M. Bosch . ... Josep M. Bosch image . ... vsnet-campaign-sn 476 ] SN 2002fk in NGC 1309 . ...

THE 75th NAME-LIST OF VARIABLE STARS. ... The 75th Name-List consists of two tables. ... the literature, taken from positional catalogues, including USNO A1.0/A2.0 and GSC, or determined by the authors); the range of variability (sometimes the column Min gives, in parentheses, the amplitude of light variation; the symbol ( means that the star , in minimum light, becomes fainter, than the magnitude indicated); and the system of magnitudes used ( P are photographic ...

... Copyrightї1997 Bob Yen (byen@ix.netcom.com) (http://www.comet-track.com/hb/hb.html) . ... Information on Comet Hale-Bopp for the Non-Astronomer Hale-Bopp rotates about twice a day (3/14/97) . ... The Comet Observation Home Page was been selected to receive the Griffith Observatory Star Award for the week of February 2 - 8, 1997 for excellence in promoting astronomy to the public through the World Wide Web. ... Typically, about 1,000 individual users/computers access this page every day. ...

README for XFree86 on OS/2 : Adding Variables to CONFIG.SYS . ... ETC . Set to an ETC directory. Normally, this is already set to the ETC directory of the TCP/IP code, such as SET ETC=C:\TCPIP\ETC For Warp 4 and later, this may point to the \MPTN\ directory. ... Normally you will set this variable to the same value as the HOSTNAME variable and simply add a :0.0 after it, such as SET DISPLAY=myhost:0.0 Read the X11 man page on the exact meaning of these postfixes and other options. ...