NGC 3370: A Sharper View . ... Credit Copyright: Hubble Heritage Team , A. Riess ( STScI ) NASA Explanation: Similar in size and grand design to our own Milky Way , spiral galaxy NGC 3370 lies about 100 million light-years away toward the constellation Leo. ... Looking within NGC 3370, the image data has proved sharp enough to study individual pulsating stars known as Cepheids which can be used to accurately determine this galaxy's distance. ... U. Based on Astronomy Picture Of the Day ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2005 May 14 . NGC 3370: A Sharper View . Credit: Hubble Heritage Team , A. Riess ( STScI ) NASA . Explanation: Similar in size and grand design to our own Milky Way , spiral galaxy NGC 3370 lies about 100 million light-years away toward the constellation Leo. ... About APOD | ... NASA Web Site Statements, Warnings, and Disclaimers . ...

... Stellar Evolution is driven entirely by the never ending battle between Pressure and Gravity . As imbalances are reached, the star is driven to find a new Energy source. ... Pressure and gravitational forces are equal, the star is stable and its core is sufficiently hot to fuse Hydrogen into Helium More about main sequence stars . ... The luminosity generated by the core fusion of Helium into Carbon is far greater than the shell luminosity associated with the fusion of Hydrogen into Helium. ...

Two groups are measuring distant supernovae with the goal of determining whether the Universe is open or closed by measuring the curvature in the Hubble diagram. The figure below shows both data sets: Perlmutter et al. (1997) and (1998) in black and Garnavich et al. (1997) in orange. The curves show a closed Universe (Omega = 2) in red, the critical density Universe (Omega = 1) in black, the empty Universe (Omega = 0) in green, and the steady state model in blue. ... Tutorial : Part 1 | ...

2014 May version . ... Green D. A., 2014 , Bulletin of the Astronomical Society of India, 42 , 47-58. ( .pdf , or arXiv.org:1409.0637 ) If you make use of the detailed version of the catalogue, then plaese also cite: . Green D. A., 2014, `A Catalogue of Galactic Supernova Remnants (2014 May version)' , Cavendish Laboratory, Cambridge, United Kingdom (available at "http://www.mrao.cam.ac.uk/surveys/snrs/" ). ... Copyright D. A. Green 2014. 25872nd access to this version of the catalogue. ...

... The exercises are now available on the web and in six booklets (100 pages in total), titled: . ... Exercise 1: Measuring the Distance to Supernova 1987A", . Exercise 2: The Distance to Messier 100 as Determined by Cepheid Variable Stars", . Exercise 3: Measuring the Distance to the Cat's Eye Nebula" and . Exercise 4: Measuring a Globular Star Cluster's Distance and Age". ... More exercises will follow in the future. ... Exercise 3 - Measuring the Distance to the Cat's Eye Nebula . ...

T he Siding Spring Survey (SSS) is a Near-Earth Object search program that utilises the 0.5-m Uppsala Schmidt Telescope at Siding Spring Observatory, N.S.W., Australia. ... The mission of the Siding Spring Survey is to contribute to the inventory of near-earth objects (NEOs), or more specifically, the potentially hazardous asteroids (PHAs) and comets (PHOs) that may pose a threat of impact and thus harm to civilization. ... Based on the CSS Mission page . ... Siding Spring Survey Main Page . ...

ACS Insturment Handbook for Cycle 24 . ... Dithering and CR-SPLIT ing more than the minimum recommended values tends to yield higher quality images with fewer residual detector defects, hot pixels or CR signatures in the final combined image. ... Thus, the optimal number of sub-exposures is a result of a trade-off between completeness of the hot pixel elimination, CR-rejection, final image quality, and optimal S/N. A schematic flow chart of this trade-off is given in Figure 7.2 . ...

Next: - for Supernova Explosions Up: Evolution of Supernova Explosion Previous: The Supernovae Rates . ... For a homogeneous space distribution of sources, - is a linear law with slope 3/2 (in other words, because and , where R is a distance to sample source). ... Then, for the homogeneous space distribution of sources, the - dependence would be , where C is some constant. However, for distant objects - depends not only on the space distribution of the sources, but also on some other factors. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Colin Johnston . ... Our Galaxy . ... To locate it, look along the imaginary line between the two end stars on the leading edge of the PloughтАЩs blade (Merak and Dubhe) and Polaris (the North Star), the galaxy M82 (also known as the Cigar Galaxy) along with its companion M81, lies just off this line about a third of the way between the Plough and Polaris. €а€аAs usual, the supernova is far brighter than its home galaxy, appearing as an extra star. ...

... This example uses an error array to determine the errors in the radial profile. task: imcnts . ... xs imcnts err=vigsnr_err expo=xdata$snr_exp.pl expthr=95.0 bkgdex=xdata$snr_exp bkgdth=95.0 bkgderr=vigsnr_err # Run the imcnts task with the appropriate parameters source image file : vigsnr # vigsnr.imh source region descriptor: a 300 300 0 50 n=5 # 5 annuli centered at 300 , 300 , 0 and 50 pixels min/max radius background image file or cts/pixel: cr # From the same ...

... ESO is building what will be the World's largest optical telescope array, The Very Large Telescope (VLT). The VLT Project organisation is responsible for the design and construction of the Unit Telescopes, including enclosures, optics, adapter-rotators and coating unit. ... Unit Telescopes Overview - This page is outdated, an update is in process. ... Secondary mirror (M2 Unit) - This page is outdated, an update is in process. ... Coating Unit - This page is outdated, an update is in process. ...

23rd of June 2015 . The supernova remnant Puppis A . ... Puppis A is the remnant of a supernova explosion which occurred several thousand years ago and now appears as a shell of ~1 deg diameter. This composite picture displays the radio continuum emission (red) obtained by combining Parkes and broadband ATCA observations, with a visible light (green) background from the Digital Sky Survey. ... today * ATNF | Parkes | ATCA | ...

... Style Sheets in Communicator . Using Cascading Style Sheets to Define Styles . ... Inheritance of Styles . Defining Style Sheets with the <STYLE> Tag . Defining Style Sheets in External Files . Defining Classes of Styles . ... Combining Style Sheets . ... Setting Border Widths, Color, and Style . ... Comments in Style Sheets . ... Style Sheet Properties . Font Properties . ... Font Style . Text Properties . ... Style Sheets Ink Home Page . Overview of the Style Sheet . ...

Supernova 2011iy in NGC 4984 . This page is devoted to information on 2011iy in NGC 4984 . Basic information on this SN, including the last reported brightness, on this Supernova can be found on the main page . ... This supernova is in the Constellation Virgo . ... 2011/12/09.856 . ... 2011/12/10.5332 . ... Joseph Brimacombe . 2011/12/10.541 . ... 2011/12/10.785 . ... 2011/12/11.513 . 12.6 . ... 2011/12/20.873 . ... 2011/12/21.542 . ... JM Llapasset . ... 2012/01/04.524 . ...

... Recherche dans le site : . Ciel Espace, le magazine qui vous guide toujours plus loin . ... Ciel Espace, nouvelle formule, c'est . des actualit†йs . ... des pages consacr†йes †а la publication de vos photos Mais c'est aussi une vraie communaut†й avec laquelle partager votre passion et nourrir votre curiosit†й. Accueil Un astre au cЉУur liquide dans la constellation de Cassiop†йe . ... L'astre se situe †а 11 000 ann†йes-lumi†иre de la Terre, dans la constellation de Cassiop†йe . ...

... The explosion of a star as a Supernova is certainly one of the most energetic events observable in the whole universe, and their radiation covers the whole band from radio to gamma-rays, accompanied with neutrino emission. ... Type Ia SNe are supposed to result from mass transfer inside a binary system consisting of a white dwarf star and an evolving giant star, which results in a termonuclear explosion. ... Core-collapse Supernovae . ... For comments please contact: gcresci@arcetri.astro.it . ...

... Home Education Classes AAA Winter Astronomy Class: Measuring Distances in Space тАУ Dec 2015 тАУ Feb 2016 . ... Classes . AAA Fall Astronomy Class: Astronomy Basics тАУ October-November 2015 . AAA Winter Astronomy Class: Measuring Distances in Space тАУ Dec 2015 тАУ Feb 2016 . AAA Spring Astronomy Class: The Physics of Astronomy тАУ February - March 2016 . ... This MonthтАЩs Sky тАУ April 2016 . ... Dec. ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . ...

... The sband transmitter measures reflected power using directional couplers at: . ... waveguide along rotary floor out to turnstile, horn . ... horn . ... Any water in this piece of waveguide would flow away from the antenna reflected power coupler that is next to the horn . ... We can see a changed in the reflected power as we go from high to low za (if water in the waveguide) using the network analyzer. the null at 25 feet is probably the distance from the turnstile to just beyond the rotary coupler...

... Big ellipse: the region of the photometric analysis Smaller ellipses: the adopted inner boundaries of the Main Body and the C component Small circles: diffuse background objects, manually selected and removed from the photometry Uncleaned CMDs [V-I, I] of I Zw 18, obtained using Aloisi et al. (left) and Izotov & Thuan (right) datasets. ... Where is the 'halo'? Blue compact dwarf galaxy SBS 1415+435 Hubble Space Telescope / Advanced Camera for Surveys NASA, ESA A. Aloisi (STScI, ESA) et al. ...