... DMSP Satellites , RAS Explanation: Where have all the dim stars gone? From many places on the Earth including major cities, the night sky has been reduced from a fascinating display of hundreds of stars to a diffuse glow through which only a handful of stars are visible. The above map indicates the relative amount of light pollution that occurs across the Earth . ... Publications with keywords: Earth - light pollution . Publications with words: Earth - light pollution . ...

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. ...

... 2001 August 27 . Artificial Night Sky Brightness . ... From many places on the Earth including major cities, the night sky has been reduced from a fascinating display of hundreds of stars to a diffuse glow through which only a handful of stars are visible. The above map indicates the relative amount of light pollution that occurs across the Earth . ... Parts of the Eastern United States and Western Europe colored red have an artificial night sky glow over nine times that of the natural sky. ...

... Observing . ... Solar Observing . ... April 3 (SUN) - Solar Observing, Central Park , Manhattan . ... APRIL'S SKY . ... Lecture Series at the American Museum of Natural History The Amateur Astronomers Association is proud to present an astronomy lecture series from October through May each year for our members and the .. ... The€аAmateur Astronomers Association of New York€аwas organized in 1927 to promote the study of Astronomy, emphasizing its cultural and inspirational value. ...

Left: An image in the near infrared (1.65 ЮМm) around RY Tauri, using a special mode of the Subaru HiCIAO coronagraph, the polarized intensity image. This type of observation is preferred for faint emissions associated with scattered light around planet-forming disks, as there is less light from the much brighter star. ... A white ellipse shows the position of the midplane of the disk, which is observed at millimeter wavelengths. ... Right: Schematic view of the observed infrared light. ...

SAOtng can associate names with region markers in order to aid users in remembering the significance of the region. ... By default, marker regions that you create in SAOtng are defined to be either "source" regions or "background" regions and are colored green and red, respectively. ... This type name is controlled by the "Set Type (and Color)" option in the marker menu (activated using the right mouse button within a region). ... Colors can be associated with names for regions. ...

[ CATS home ] [ Back to CATS list ] [ ftp ] . 2000ApJS..131..335Rutledge+ . Division of Physics, Mathematics and Astronomy MS 220-47, California Institute of Technology, Pasadena, CA 91107 rutledge@srl.caltech.edu, rb@astro.caltech.edu, prince@srl.caltech.edu

... The Witch Head Nebula . ... Explanation: Double, double toil and trouble; Fire burn, and cauldron bubble -- maybe Macbeth should have consulted the Witch Head Nebula. ... More formally known as IC 2118 , the Witch Head Nebula glows primarily by light reflected from Rigel , located just outside the top right corner of the above image . ... The blue color is caused not only by Rigel's blue color but because the dust grains reflect blue light more efficiently than red. ...

. (artistic credits: J. English and B. Koribalski) . bkoribal @ atnf.csiro.au

NGC 1427A is the brightest irregular galaxy in the Fornax Cluster . ... NGC 1427A is comparable in size, luminosity and color to the LMC . Both galaxies show striking signs of recent star formation. ... Possible interaction partners could be the central Fornax galaxies NGC 1404 or NGC 1399 and its large extended cD halo. ... See our preprint `` NGC 1427A - an LMC type galaxy in the Fornax Cluster'' , 1997, A 327, 562 (as a gzipped .ps file [528k], please add ".gz" after downloading). ...

... I. Mean Surface Brightnesses and Integral Color Indices for Bars Gusev A.S. ================================================================================ Abstract: UBVRIJHK surface brightnesses and color indices of bars of galaxies are determined using surface photometry data for 100 barred galaxies (table1.dat). ... J0 Mean surface J0 brightness 46 A1 --- CI- CI sign 47 -50 F1.2 magn/sq.arcsec. U-B)0 (U-B)0 color index 52 -55 F1.2 magn/sq.arcsec. ...

... Flux density at 1 GHz (/Jy): 130 . ... X-ray: Brightest to the E. Point sources: Central possible pulsating X-ray source. ... Molonglo at 408 MHz (3': S=198?20 Jy). ADS . ... 1982, ApJ, 258, 22. Einstein observations. ... IR observations. ... Possible pulsation detection from central X-ray source. ... X-ray observations of central source. ... ATCA at 1.4 GHz (90'') for H I near central X-ray source. ... Chandra observations of E edge. ... Chandra proper motion study of central X-ray source. ...

... NICMOS Data Handbook > Chapter 5: Data Analysis > 5.4 PSF Subtraction . ... PSF subtraction for NICMOS data can be very effective, especially for images from cameras 1 and 2, thanks to a few important features of this instrument: . ... The factors are: focus variations due to OTA breathing, cold mask irregular motion (?wiggling?) on an orbital time scale, PSF color dependence. ... Table 5.5: Effect of focus variation, cold mask wiggling, and PSF color dependence on PSF subtraction. effect of: . ...

... This gives us another handle on how distant the stars are. ... Stars differ not only in distance, but also in apparent brightness. ... Ranking stars by brightness . ... The brightness of the star decreases as the square of the distance. ... At what distance would a 100-watt light bulb have the same brightness as the brighter stars? ... So if the distance of the 100-watt light bulb was 5 kilometers, the distance of the brighter stars would be 10,000,000,000,000 kilometers, or about a light-year. ...

Supernova 2001X in NGC 5921 . This page is devoted to information on Supernova 2001X in NGC 5921 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. ... SNWeb has a 2001X page . ... 2001/03/02.386 . ... 15.2 . ... Arne Danielsen image . ... JM Llapasset image . ... vsnet-alert 5763 ] SN 2001X in NGC 5921 . ...

... Подвесные игрушки . ... Тип товара на Маркете: Бриджи детские . ... Тип товара: Бриджи . ... Тип уборки: сухая/влажная . ... Тип пылесборника: мешок . ... Тип пылесоса: обычный . ... Тип: шлифовальная ; . ... Тип установки: врезная; Цвет: светло-серый; Материал: искусственный гранит . ... Тип застежки: молния . ... Тип сумки: для ноутбука . ... Тип товара: Кофты . ...

... In collaboration with Drs Van Genderen (Leiden, Holland) and Sterken (Brussels, Belgium) papers XV and XVI in the series `Light Variations of Massive Stars' were published. These dealt with the brightness variations of several massive stars in the two nearest neighbour galaxies, namely six stars (R85, R99, R103, R110, R123 and R128) in the Large Magellanic Cloud (LMC) and two (R42 and R45) in the Small Magellanic Cloud (SMC). ...

... 11 Yellow-Green (78% transmission): Contrasts well with the red and blue characteristics of surface features on Jupiter and Saturn. ... 82A Light Blue (73% transmission): Useful on the Moon, Mars, Jupiter, and Saturn, this subtle pale blue filter enhances areas of low contrast while avoiding significant reduction of overall image brightness. ... Meade Series 4000 Photo-Visual Color Filters may be ordered individually or in the following sets: . ... Meade Series 4000 Broadband Nebular Filters . ...

... Energy . ... Solar Wind . ... Field . ... The Sun is our nearest star and the source of energy for life on Earth. ... For centuries astronomers wondered whether they were clouds floating in the Sun's atmosphere, but we now know that they really are huge regions of magnetic field, about as intense as the field at the poles of an iron magnet. For some reason the field slows down the flow of heat from the Sun's interior and keeps sunspots slightly cooler than their surroundings. ... Solar Eclipses . ...

... 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. ...