Next: The Formation and Evolution Up: NICMOS Science Previous: NICMOS Observes the Galactic . ... We have taken diffraction-limited ( 0.15") near-infrared F160W (henceforth H-band, for convenience) images with NICMOS on HST of the center of the R136 cluster (age 3.5 Myr) in the core of the 30 Dor giant HII region in the Large Magellanic Cloud. ... 1996, ApJ 466, 274) can sample only M >2M , while previous V and I band HST images with WFPC2 (Hunter et al. ...

... Four types of galaxy environments are considered: clusters, centers of groups, other places in groups, and the field. ... In order to check whether the mean ages of the stellar populations depend on environment density monotonically, as the hierarchical par­ adigm predicts, in this work I consider four types of environment separately: the cluster galaxies, the brightest (central ) galaxies of groups, the second­ranked group members, and the field galaxies. ... Group center SB(rs)0# 204 637 1996 Oct ...

... Bad Astronomy . ... Bitesize Astronomy . ... Here's a question for you: if you were to place the Moon randomly anywhere in the sky, on average, how many stars would it cover up? ... We found that the sky is about 40,000 square degrees . ... The area of a circle is pi * radius^2, so the Moon's area is pi * (1/4)^2=0.2 square degrees. So the number of stars in an area the size of the Moon is 0.15 stars/square degree * 0.2 square degrees=0.03 stars per Moon area. ... 2008 Phil Plait. ...

... Tonight's Sky . ... Star Atlas . ... stars . ... APEX turns its eye to dark clouds in Taurus . Behind these clouds lie rich areas of star formation. ... APEX image of a star-forming filament in Taurus. ... In it, newborn stars are hidden, and dense clouds of gas are on the verge of collapsing to form yet more stars. ... The Taurus Molecular Cloud is particularly dark at visible wavelengths as it lacks the massive stars that illuminate the nebulae in other star-formation regions such as Orion. ...

... Stars . ... Monthly Sky Notes . ... January . ... But as you may find as we work our way around the stellar тАШcastтАЩ of the Winter Circle, these very bright stars can sometimes be more than just one star, such as Rigel which is actually a triple star system working together to provide such a beautiful twinkle in our night sky. ... Just be careful not to wonder too far away from the circle if trying to star hop around it, there are many diversions and attractions that are out to distract you! ...

... AstroImageJ (AIJ) .. ... Reads and writes FITS images with standard headers . ... Provides a time and coordinate converter tool with capability to update/enhance FITS header content (AIRMASS, BJD, etc.) ... Creates color images and with native ImageJ processing power . ... AstroImageJ_Updater . Update operation now updates AIJ version number in Info.plist CFBundleVersion and CFBundleShortVersionString (MacOSX only) . ... AstroImageJ is ImageJ with astronomy plugins and macros installed. ...

Using Site testing data for Adaptive Optics simulations Kislovodsk, October 2010 1Glen Herriot, 1David Andersen, 1Jean-Pierre VИran, 2Brent Ellerbroek, 2Luc Gilles, 2Lianqi Wang 1National Research Council Canada ­ Herzberg Institute of Astrophysics 2TMT Project Office, Pasadena TMT.AOS.PRE.10.074.REL01 1 Outline TMT / NFIRAOS Site Testing Parameters and their value for Adaptive Optics Simulations ... TMT.AOS.PRE.10.074.REL01 9 What is the interest of Adaptive Optics in r 0 Seeing ? ...

... Python IDL download calc_kcor.pro . ... At present, SDSS (ugriz), UKIRT WFCAM (YJHK), ; Johnson-Cousins (UBVRcIc), and 2MASS (J2H2Ks2) ; are supported ; redshift - redfshift of a galaxy (floating point) ; colour_name - colour identification (string) ; colour _value - value of colour in magnitudes (floating point) ; should be in the AB mags for ugrizYJHK ; and in Vega mags for Johnson-Cousins/2MASS colours ; ; RETURN VALUE: K-correction in the specified filter for given redshift ; and ...

... Home Articles Best Celestial Events of 2006 . ... Clear Sky Chart . ... Beyond New York City . ... Best Celestial Events of 2006 . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . Observing Resources for Amateur Astronomers - Part 2: Intermediate Observers . ... A History of the First Forty Years of the Amateur Astronomers Association . ... Amateur Astronomers Medal . ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

... The spectrum of the brightest star, our Sun, shows several dark gaps perpendicular to the flow of it’s colours (figure 1). These so called spectral absorption lines where discovered in 1802 by the English scientist William Wollaston. ... Some stars as Pollux show a spectrum similar to that of our sun with strong Ca II and Fe II lines, others as Sirius or Vega show strong absorption lines of hydrogen, others, as Mira show very complicated spectra due to molecular absorption lines (see figure 5). ...