... The two plots below illustrate two of the selection criteria: velocity width (limited by the channel width) and the HIPASS peak flux. Zoom-in on Figure 3a. The two plots below give some idea of the shape of the HI spectra. ... For Gaussian HI spectra the difference is slightly more, but for irrgeular galaxies, pairs and groups many different shapes are observed. ... Some trend towards detecting more narrow-width galaxies at higher velocities is visible. ...

Definitions of Magnitudes and Surface Brightness 1 The magnitude system 1.1 Apparent magnitude Astronomers are stuck with the antiquated old system of magnitudes and so a clear explanation of what this system is and how it relates to more sensible units is important. ... 1.2 Absolute magnitude Absolute magnitude is a logarithmic luminosity scale. ... One usually goes by the round about process of referring to the absolute magnitude of the sun. ... Magnitudes and surface brightness 6/6 ...

... Meta Index / Home Page / Description / Soft flare rejection for . The EPIC-pn fast timing mode was designed so that a time resolution of 0.029 milliseconds can be achieved. ... Below this energy the data is affected by so-called soft flares which are caused by stack overflows generated by high energy particles. These so-called soft flares have sharp rise (from 0 counts/sec to several thousand counts/sec in 0.10-0.15 sec) then decaying back 0 counts/sec slightly slower in about 0.3-0.4 sec). ...

. April 7, 1998 . Fig. 1. An example of the EUV and soft X-ray large-scale chain of bright point revealed by the modified SOHO/EIT and Yohkoh/SXT images. A coinciding almost straight-line chain of the bright points extends between very distant points 1 and 2 on the SOHO/EIT (a) and Yohkoh/SXT (b) images of April 7, 1998. Back to the page of the SOHO/EIT and Yohkoh/SXT chains . Back to the parent page . Last update: 9 August 1998 .

... Comet Animation . ... Comet structures are diverse and very dynamic, but they all develop a surrounding cloud of diffuse material, called a coma, that usually grows in size and brightness as the comet approaches the Sun. ... As comets approach the Sun they develop enormous tails of luminous material that extend for millions of kilometers from the head, away from the Sun. ... The evaporated molecules boil off and carry small solid particles with them, forming the comet's coma of gas and dust. ...

Milky Way X-ray background emission « »: , . ... RXTE , . ... Using near-infrared Galaxy intensity measured with COBE/DIRBE experiment and X-ray data from RXTE and INTEGRAL it was shown that X-ray brightness of the Galactic background emission closely follows its stellar density and can be explained by a cumulative emission of a large number of weak Galactic X-ray sources. ... Map of Galactic background emission in hard X-ray energy band obtained with INTEGRAL observatory. ... 2006, &, 452, 169 ., ...

... Telescopes ћ Binoculars ћ Microscopes . Meade Ultra-High Transmission coatings (UHTC ) Group . ... Meade Standard Coatings: The optical surfaces of all Meade telescopes include high-grade optical coatings fully consistent in quality with the precision of the optical surfaces themselves. ... These specialized, and extremely advantageous, coatings are offered here as the Meade Ultra-High Transmission Coatings (UHTC) group, a coatings group available optionally on many Meade telescope models. ...

... Parents who home-school their children often find it hard to locate suitable material for teaching astronomy and physics, as well as earth and space sciences, especially at the level of upper grades. ... Stargazers" also includes a linked, annotated timeline that covers 13,000 B.C.-2003 A.D. which allows parent-teachers to relate the science to history. ... I am grateful to a homeschooling parent, Mrs. April Dykes, for volunteering to handle the distribution of such disks, at cost. ... April Dykes ....

WILLIE MOORE Willie Moore was a King, his age twenty-one Courted a maiden fair; Her eyes were like two diamonds bright Raven black was her hair, hmmm hmmm hmmm.. He courted her both day and night, To marry him she did agree, But when they went to get her parents' consent, They said, "This could never be," hmmm, hmmm, hmmm.. I love Willie Moore," sweet Annie replied, "Better than I love my life, And l would rather die than weep here and cry, Never to be his wife," hmmm, hmmm, hmmm.. ...

... This paper describes the main algorithms used by the Einstein Level One processing to create the exposure masks and the background maps for Einstein IPC images, and how these algorithms were recreated in the IRAF environment. Our goal was to recreate the algorithms used by the Level One Processing to create exposure masks and background maps for Einstein Image Proportional Counter (IPC) data (cf. sections 2.5 and 2.7 of Harnden et al. ...

... Ciel Espace, le magazine qui vous guide toujours plus loin . ... des actualitГїs . des reportages . ... des pages consacrГїes Г la publication de vos photos Mais c'est aussi une vraie communautГї avec laquelle partager votre passion et nourrir votre curiositГї. Accueil Г? la une On a retrouvГї les parents du SystГЕme solaire . ... Page 8 . ... En les Гїtudiant, les astronomes ont rГїcemment rГїussi Г dГїcrypter des informations capitales pour comprendre comment le SystГЕme solaire est apparu. ...

Stellarium 0.12.3 . ... StelButton Class Reference . A Button Graphicsitem for use in Stellarium's graphic widgets. ... StelButton (QGraphicsItem *parent, const QPixmap &pixOn, const QPixmap &pixOff, const QPixmap &pixHover=QPixmap(), QAction *action=NULL, bool noBackground=false) . ... StelButton (QGraphicsItem *parent, const QPixmap &pixOn, const QPixmap &pixOff, const QPixmap &pixNoChange, const QPixmap &pixHover=QPixmap(), QAction *action=NULL, bool noBackground=false, bool isTristate=true) . ...

... V.V. Busarev, Sternberg State Astronomical Institute, Moscow University, . ... V. V. Busarev1, M. N. Taran2, V. I. Fel’dman3 and V. S. Rusakov41 Lunar and Planetary Department, Sternberg State Astronomical Institute, Moscow State University, 119992 Moscow, Universitetskij pr., ... 1 Sternberg State Astronomical Institute, Moscow University, Universitetskij pr., ... V. V. BUSAREV, Sternberg State Astronomical Institute, Moscow University, Russian Federation (RF) (E-mail: busarev@sai.msu.ru); . ...

... Mark C. Lee (Colonel, USAF, Ret.) NASA Astronaut (former) . ... EDUCATION: Graduated from Viroqua High School, Viroqua, Wisconsin, in 1970; received a bachelor of science degree in civil engineering from the U.S. Air Force Academy in 1974, and a master of science degree in mechanical engineering from Massachusetts Institute of Technology in 1980. ... NASA EXPERIENCE: Lee was selected as an astronaut candidate by NASA in May 1984. ... Lee retired from NASA and the Air Force effective July 1, 2001. ...

... The ROSAT Bright Survey: II. Catalogue of all high-galactic latitude RASS sources with PSPC countrate CR > 0.2 s -1 . ... 1S We present a summary of an identification program of the more than 2000 X-ray sources detected during the ROSAT All-Sky Survey (Voges et al. 1999) at high galactic latitude, |b| > 30degr , with countrate above 0.2 s -1 . This program, termed the ROSAT Bright Survey RBS, is to more than 99.5% complete. ...

Next: Gravitational Wave Background from Previous: Galactic Gravitational Wave Background . ... It is intuitively clear that at frequencies above the critical ones for our Galaxy, one will detect rare bright jerks produced by coalescing white dwarfs   (at a rate of 1 per 100 year) and NS (at a rate of 1 per - year) in our Galaxy, against a background of the extragalactic stochastic GW. ... Firstly we consider GWB from close individual galaxies, and then will discuss overall extragalactic GWB. ...

... 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. ...

... PUBLIC LECTURE - APRIL 12, 2016 . New Discoveries in the Outer Solar System: Ceres, Pluto and Planet X . ... Dr. Green will talk about "New Discoveries in the Outer Solar System: Ceres, Pluto, and Planet X". ... Beginning in 1992 planetary astronomers began to find Pluto like objects beyond the orbit of Neptune showing us that Pluto was a member of an entirely new family of objects we now call the Kuiper Belt. ... Amateur Astronomers Association of Princeton, Inc., ...

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... Dept. for Astrometry & Space Geodynamics . ... Dept. for Physics of Stars&Galaxies . ... Dept. for Physics of Planetary Systems . ... Science . ... All Pages . ... Research of the stars with planets which pass apparent star disk (transiting exoplanets). The transit method based on a detection star brightness decrease during a passing of planet in front of its disk. Observed brightness system decries when planet pass star disk and its volume depend of the relative sizes star and planet. ...