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. ...

Еще в разделе: (Показать все результаты (>264) - zebu.uoregon.edu/ )

... 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. ...

Еще в разделе: (Показать все результаты (>2155) - star.arm.ac.uk/ )

• Wonderful Moon - Venus Conjunction | International Year of Astronomy in Ireland
• Why Asteroid 2008 TC3 Represents a Landmark - Dr David Asher, from Armagh
• Terry Mosely's Bulletins

The sky background can contribute significant Poisson noise in broad and medium band filters, and must be taken into account during noise calculations. The actual sky brightness depends on the heliocentric ecliptic coordinates (latitude and longitude) in a manner summarized in Table 6.3 . ... 22.4 . ... An average sky brightness of V=22.9 mag arcsec -2 is assumed. ... Values for other filters or sky brightnesses can be computed from Table 6.2 , Table 6.1 , Table 6.3 , and Equation 6.2. ...

Еще в разделе: (Показать все результаты (>11530) - www.stsci.edu/ )

• Observing Faint Targets Near Bright Objects
• WFPC2 Instrument Handbook Update
• Spectroscopy of Planetary Nebulae

... That robot, or course, is the spacecraft Cassini, while the new amazing view includes a bright moon, thin rings, oddly broken clouds, and warped shadows. ... Journey to the Center of the Galaxy . ... What wonders lie at the center of our Galaxy? ... Now shining in eastern skies at dawn, bright planets Venus and Jupiter join the Pleiades star cluster in this sea and sky scape, recorded earlier this week near Buenos Aires, Argentina. ... Dark Clouds in Aquila . ... In the Glare of Alpha Centauri . ...

Еще в разделе: (Показать все результаты (>111711) - www.astronet.ru/ )

Once students get the hang of it, they can find and measure the brightness of Delta Cephei in a few minutes. ... of Delta Cephei . ... Oct. ... The following table lists the measurements of Delta Cephei made by one amateur astronomer in autumn 1990. ... 4.0 . ... This activity is a simplified version of one that appeared in Hands-On Astrophysics, a series of activities prepared by the American Association of Variable Star Observers with support from the National Science Foundation. << previous page | ...

Еще в разделе: (Показать все результаты (>859) - www.astrosociety.org/ )

• ASP: Focus on Education: The Key to Success in Astronomy
• ASP: Accidental Astrophysics: The Devil's In the Magnitudes, Part II
• ASP: Sharing the Universe

... 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. ...

Еще в разделе: (Показать все результаты (>408) - www.badastronomy.com/ )

• Phil Plait's Bad Astronomy: Bitesize Astronomy
• Phil Plait's Bad Astronomy: Bad TV
• Phil Plait's Bad Astronomy: SPOILER Review: The Mummy Returns

... 2011 June 5 . Another Nearby Supernova in the Whirlpool Galaxy . ... Explanation: One of the brightest supernovas in recent years has just been recorded in the nearby Whirlpool galaxy (M51). Surprisingly, a seemingly similar supernova was recorded in M51 during 2005, following yet another one that occurred in 1994. ... Pictured above are two images of M51 taken with a small telescope: one taken on May 30 that does not show the supernova, and one taken on June 2 which does. ... About APOD | ...

Еще в разделе: (Показать все результаты (>5193) - www.sai.msu.su/ )

• APOD: 2010 May 16 - Crescent Venus and Moon
• APOD: 2006 October 30 - Crescent Venus and Moon
• APOD: 2006 April 6 - Unusual Bright Soil on Mars

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 | ...

Еще в разделе: (Показать все результаты (>408) - www.astronomy.net/ )

• You Can't Make Stellar Images Brighter - an Astronomy Net Article
• Finding Himalia, The Fifth Brightest Moon Of Jupiter - an Astronomy Net Article
• No There's Another Mistake - an Astronomy Net Blackholes Forum Message

Supernova 2001C in PGC 19975 . This page is devoted to information on Supernova 2001C in PGC 19975 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 Supernova links web page. ... We have a DSS Photometry reference image made by Odd Trondal. ... 2001/01/04.9 . ... Discovery local mirror . ... Josch Hambsch image . ... JM Llapasset image . ...

Еще в разделе: (Показать все результаты (>934) - www.rochesterastronomy.org/ )

• Supernova 1999X in CGCG 180-22
• Supernova 1999br in NGC 4900
• Bright Supernova - Archives

... 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? ...

Еще в разделе: (Показать все результаты (>2519) - www.armaghplanet.com/ )

• Altair, Deneb and Vega: three easy to spot stars | Astronotes
• Stargazing Live 2012 in Armagh | Astronotes
• NGC4666: Secrets of a Starburst Galaxy | Astronotes

The parameter brief (with its actual uncertainty sbrief) is the mean effective surface brightness in B-band , i.e. the mean surface brightness inside the effective aperture (the circular aperture enclosing one-half the total flux). It is expressed in mag arcsec -2 . ... 2) from the mean surface brightness "LV" inside the effective isophote (elliptical isophote enclosing one half the total flux) measured by Launberts&Valentijn (1989) . ... Effective radius . ... HyperLeda . ...

Еще в разделе: (Показать все результаты (>1320) - www.sao.ru/ )

• Influencing the plan
• HyperLEDA documentation: compilation of surface brightness (a105)
• RBSC-NVSS SAMPLE. I. RADIO AND OPTICAL IDENTIFICATIONS

XMM-Newton Science Analysis System . ... A different approach is done via the setting withctisrcpos =Y: all event energy corrections do not use the actual RAWY coordinate but the corresponding RAWY location of the source ( SRCPOS ) as determined by the task epframes (either automatically or via setting withsrccoords =Y). ... The task epchain may be used with the setting ccds =4 withctisrcpos =Y to process only the CCD 4 where usually the bright source is located that causes the Out-of-Time events. ...

Еще в разделе: (Показать все результаты (>3564) - xmm.vilspa.esa.es/ )

• Analysis of extended sources or in the vicinity of moderately bright sources

. Search this album . Gallery . :: Public Events . :: Opening of Canberra Astronomical Soc's nтАж . :: Of course there is a barbecue! Actually, theтАж . Sidebar Left . Sidebar Top . No Sidebar . Sidebar Bottom . Sidebar Right . View full size . Title: Of course there is a barbecue! Actually, the storm missed. File name: CAS_XmasGrand_Opening_2004_045.jpg . Dimensions: 504 x 378 px . Page: 1 2 15 16 17 18 19 20 21 22 23 24 . Powered by Gallery 3.0.9 (Chartres) . Login

Еще в разделе: (Показать все результаты (>554) - www.mso.anu.edu.au/ )

• Sky Brightness
• Observational Techniques: Units and Coordinates Notes
• C/2006 P1 (McNaught)

Y ou don't need your own Voyager to see the solar system. ... Refer to Sky Telescope or a similar magazine for up to date positions or check one of the several Web sites that show planetary positions. ... You can see 99.99% of the mass of the solar system with no instruments whatsoever. ... Jupiter . ... Mars . ... For $200 you can get a far better optical instrument than Galileo or Newton had. ... Date . ... William Herschel . ... O f course, the solar system has more than just planets and moons. ...

Еще в разделе: (Показать все результаты (>498) - www.iki.rssi.ru/ )

• First X-Rays From a Comet Discovered
• Uranus' Moon Umbriel
• Neptune

Have you ever heard the name of a star or constellation and wondered what it meant? ... I've compiled a table of commonly known star names and their definitions in the Western tradition, grouped by constellation. ... Following each constellation entry are any named stars found therein (in order from brightest to faintest), listing the Bayer (Greek letter) or other common designation, the star name, and English translation. ... Some other sites with star name information: . ...

Еще в разделе: (Показать все результаты (>2089) - www.naic.edu/ )

• Why can I only see six of the ``Seven Sisters''?
• The Pleiades
• Mythology of the Seven Sisters (Pleiads)

... Another shock for the Bullet cluster . ... With Australia Telescope Compact Array (ATCA) observations we ( Shimwell et al. 2015 ) detect a highly elongated Mpc-scale diffuse radio source on the eastern periphery of the Bullet cluster 1E 0657-55.8, which we argue has the positional, spectral and polarimetric characteristics of a radio relic. ... The image to the left shows the X-ray emission of the Bullet cluster (colour) overlaid with the ATCA radio continuum emission (green contours). ...

Еще в разделе: (Показать все результаты (>5759) - www.atnf.csiro.au/ )

• Brightness Units
• The HIPASS Bright Galaxy Catalog
• HIPASS Bright Galaxy Catalog

... 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. ...

Еще в разделе: (Показать все результаты (>194) - mavr.sao.ru/ )

• Optical component of GRB080319B
• Galaxy sector, archive 2004
• Galaxy sector, archive 1994

... Archives . ... Differential Emission Measure [Eqn] . ... Astro 301, class 1, and it took all of 20 minutes of talk about stellar magnitudes to put that notion to permanent rest. ... Now, it turns out that the human eye perceives brightness on a log scale, so magnitudes are numerically similar to log (brightness). ... frac{5}{2}\log_{10}\left(\frac{f_{object}}{f_{standard}}\right) \,,$$ . ... frac{5}{2}\log_{10}\left(\frac{L_{object}}{4 \pi d^2}\frac{1}{f_{standard}}\right) \,.$ ... Chandra Blog . ...

Еще в разделе: (Показать все результаты (>1913) - hea-www.harvard.edu/ )

• Week 2
• Target Finding
• Chandra Images for J0454.4-6713

... Main page News People . ASA . Master . Master net Homepage . ... MASTER . ... About Space Monitoring Laboratory, scientific directions, instruments, contacts . ... Latest news and news archive . ... 08.11.2011 . ... All news ...

Еще в разделе: (Показать все результаты (>54) - master.sai.msu.ru/ )

... 172, Astronomical Data Analysis Software and Systems VIII, eds. D. M. Mehringer, R. L. Plante, & D. A. Roberts (San Francisco: ASP), 407 . ... To facilitate data retrieval, we have created U-DARES, a user-friendly program that lets one look directly at the data in the USNO-A catalog, either as a graphical sky map, a plot, or a simple text table. ... To help PC users solve the problem of data retrieval, we have created the USNO-A Catalog Data Retrieval Software, or U-DARES. ...

Еще в разделе: (Показать все результаты (>1364) - www.adass.org/ )

• ADASS 2002 Conference Proceedings
• See Spike Run... Run, Spike, Run
• ADASS 2003 Conference Proceedings