... Ignacio Ugarte Urra's PhD thesis topic is the investigation of coronal bright points. In his first paper (in collaboration with Gerry Doyle and Maria Madjarska) he investigated the formation, evolution and decay of a coronal bright point via a spectroscopic analysis of its transition region counterpart and the evolution of the underlying magnetic bipole during 3 days of almost continuous observations. ... In general the bright point has a radiance 4 times higher than that of the network. ...

In this gallery are many images of Low Surface Brightness Galaxies which have recently been discovered and analyzed. ... The central surface brightness of this galaxy is 24.28 . Malin 2 This galaxy is another huge disk galaxy with a scale length of 15 kpc and a redshift of 15000 km/a. The high surface brightness knot in one of its spiral arms actually has the same color, luminosity and H-alpha equivalent width as the entire Large Magellanic Cloud . ... Truly it is a Low Surface Brightness Galaxy. ...

WEEK BEFORE EASTER I courted a bonnie girl full many's the day And hated all people who against her did say But now she's rewarded me well for my pain For she's gone to get tied to another The week before Easter , the moon bright and clear And the sun it shone brightly and keen blew the air I went out to the forest to gather fine flowers but the forest would give me no roses The roses are red, And I answer them back with a tear in my eye "How many dark ships sail the forest?" ...

... Yuri s Planet . ... On another April 12th, in 1961, Soviet cosmonaut Yuri Alexseyevich Gagarin became the first human to see planet Earth from space. ... NGC 3132: The Southern Ring Nebula . ... Comet of the North . ... Outward bound and fading in this starry scene, the well-photographed comet is remarkably similar in brightness to M31, the Andromeda Galaxy. ... Comet PANSTARRS and the Andromeda Galaxy . ... Currently, comet PANSTARRS is passing nearly in front of the galaxy Andromeda. ...

... Do you know why we have seasons on Earth? ... Even if you offer students the great activities developed by the Harvard researchers, or the great activities in ASP's teacher resource book, The Universe at Your Fingertips , your students still won't learn anything unless they work hard and think about their work. ... But none of these are worth a hoot unless they are also accompanied by hard work on students' part. ... The key to success in astronomy is the same as it is in everything else: hard work....

... 2006 April 6 . Unusual Bright Soil on Mars . Credit: Mars Exploration Rover Mission , Cornell , JPL , NASA . Explanation: What is this bright soil on Mars? Several times while rolling across Mars, the treads of the robotic rover Spirit have serendipitously uncovered unusually bright soil. ... The physics and chemistry instruments on Spirit have determined the soil, shown above , contains a high content of salts including iron-bearing sulfates . ... About APOD | ...

The night sky brightness, together with number of clear nights, seeing, transparency, photometric stability and humidity, are some of the most important parameters that qualify a site for front-line ground--based astronomy. ... Night sky at ESO-Paranal (Chile). ... Night sky brightness data . ... UBVRI night sky brightness at ESO-Paranal during sunspot maximum (A 2003, PDF) . ... The Dancing Sky: six years of night sky observations at Cerro Paranal (Starlight 2007 conference proceedings, PDF) . ...

. Please standby and you will be automatically connected to the new location of the unframed Supernova page. Or, click on the link above. If you have questions or problems, please email me at David Bishop dbishop@vhdl.org . Last modified: Mon Aug 27 12:40:15 EDT 2001

The following are some standard questions that observers have about their fixed target confirmation charts. ... Why doesn't my target appear to be centered on the cross hairs? ... How is proper motion handled? ... Target well centered . If your target is not perfectly centered in the cross hairs, see the questions below for why it may not be centered and how well centered it must be . ... So, targets to be acquired by STIS should appear well centered in the cross hairs on the confirmation chart. ...

The 1000 Brightest HIPASS Galaxies: HI Properties . ... These belong to 91 new sources for which no optical or infrared counterparts have previously been cataloged, an additional 51 galaxies for which no redshifts were previously known, and 16 galaxies for which the cataloged optical velocities disagree. ... J0001-15, ( ps eps , jpg ) J0035-25, ( ps eps , jpg ) J0105-06, ( ps eps , jpg ) J0221-20, ( ps eps , jpg ) . ... The 1000 Brightest HIPASS Galaxies: Newly Cataloged Galaxies . ...

... Here s what this longtime astrophotographer added to his submission: The comet is very low in our eastern sky, so low in fact that the wall of the observatory has prevented me from getting a clear shot for over a month. ... Everything went right: perfect focus, smooth tracking on the nucleus, and a great composition with a bright star. (12.5-inch Newtonian reflector at f/5, SBIG ST-10XME CCD camera, five 5-minute exposures stacked, taken September 16, 2013) . ...

... For more distant stars we must use other techniques. ... Hence if we see a distant galaxy and can pick out any cepheids lying within it, we can calculate its distance. ... Here then is another method to gauge the size of the Universe and there are yet more. volume at high enough temperature a nuclear fusion reaction sweeps across the white dwarf's surface and eventually we will see a spectacularly bright new star (hence nova) in our skies. ... Why is this relevant to the size of the Universe? ...

Images and text 2003 Paul Valleli . While up at Stellafane for pre-convention preparations, I spent some early morning times, experimenting with different videography setups on the 13" F/10 Schupmann at the McGregor Observatory. ... Mars was too bright and would have required neutral density filters. ... Next time, I will try 12mm and 9mm projections. ... I aquired about ten thousand frames by 3AM, at which time a breeze picked up and the seeing went to Hellas! ... 2003 Paul Valleli . ...

... The Galactic low-mass X-ray binary GS 2023+338 was discovered during the burst on May 22, 1989 with the Japanise satellite Ginga (aka Galaxy). The flux reached 17 crabs (this unit of flux measurement is an bright X-ray source, Crab Nebula) at 10-35 keV. ... No other radio telescope worldwide carried out multi-frequency measurements. ... Upon 14 days the radio flux fell below the detection level at the RATAN-600 in relation to the decrease of the X-ray flux. ...

... Bad Astronomy . ... Bad Astronomy: The North Star, Polaris, is a very bright star. Good Astronomy: Polaris is a middling-bright star, easily missed. ... He said it was close to Polaris, the North Star, but he also said it was in the East. ... It's natural, I suppose, to think that such an important star should be bright, but really, that's a conceit, like thinking that the Earth is at the center of the Universe. If more people knew just why Polaris is the North Star, this Bad Idea would stop. ...

You Can Make Stellar Images Brighter . Articles | ... A few months ago I wrote an article titled "You Can’t Make Them Brighter". So why am I now writing that you can make them brighter. ... The image of a focused star is actually a small disk called the Airy disk, named after the 19 th century scientist Sir George Airy. ... For a given aperture, a smaller Airy disk means that the light is focused to a smaller disk and is therefore brighter. ... www.astronomy.net . About Astronomy Net | ...

Photograph quality The photographs must be: I no more than 6-months old 35­40mm in width close up of your head and top of your shoulders so that your face takes up 70­80% of the photograph in sharp focus and clear of high quality with no ink marks or creases too close too far away I I I I blurred ink marked/creased I The photographs must: show you looking directly at the camera ...

A team of U.S. and German astrophysicists have made the first ever detection of X-rays coming from a comet. ... Following the initial detection, the team reported repeated X-ray emissions from the comet over the next 24 hours. ... One preliminary theory is that X-ray emission from the Sun was absorbed by a cloud of gaseous water molecules surrounding the nucleus of the comet, and then were re-emitted by the molecules in a process physicists call "fluorescence." ... Comets . ...

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 ...

... Computing the area lost to bright pixels declared on-board is another matter. It depends on energy, through the bright pixel level. If the telescope's attitude were to vary significantly (more than the PSF) with time, then it should be considered using X,Y (attitude corrected) as coordinates for CCDBKG, since the optical background from stars would follow the attitude variations. ... The subroutines CTI_CORR and ENERGY only call the CAL routines CAL_mosCTIcorrection and CAL_gainCorrection. ...