This page is devoted to information on Supernova 1999gn in NGC 4303 (= M61 ) Basic information on this SN, including the last reported brightness, on this Supernova can be found on the main supernova page. Information on the original web pages for many of these images can be found on the Supernova links web page. ... SEDS has a Supernova 1999gn page . ... Seiichi Yoshida has a 1999gn page . ... Kopernik 's M61 and supernova 1999gn page . ... vsnet-alert 3835 ] SN 1999gn in NGC 4303 = Messier 61 . ...

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• Discovery of Supernova 2000C in NGC 2415
• Supernova 2006E in NGC 5338
• Supernova 2000K in MCG +9-19-191

... 2008 November 17 . HR 8799: Discovery of a Multi-planet Star System . ... Explanation: How common are planetary systems like our own Solar System? In the twelve years previous to 2008, over 300 candidate planetary systems have been found orbiting nearby stars. ... Although the HR 8799 planetary system has significant differences with our Solar System, it is a clear demonstration that complex planetary systems exist, systems that could conceivable contain an Earth-like planet . ... About APOD | ...

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• Contributions by amateurs: SN1996X.
• APOD: August 8, 1995 - Columbia Waits, Discovery Launches
• APOD: 2001 June 17 - Colorful Clouds Of Carina

... In order to compare the number of different evolutionary stages obtained and X-ray luminosity of the chosen X-ray sources with the observed galactic values we use the sum of C/O+O/C , where C and O are the calculated and observed values of a given binary type, respectively. If we make comparison for a number of different binary species (for example, we compare the number of CV, number of X-ray pulsars,   total X-ray luminosity of LMXB, etc.), we write this criterion in the form: . ...

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• Science with CXO
• The Radiopulsar PSRB1259-63 - a Probe in the Stellar Wind Plasma
• Initial Distributions of Binary Parameters

... Right: cold gas traced by [CII] emission (red) accreting onto a primeval galaxy (green) at z=7.1 ( Maiolino et al. 2015 ) (image credit: ALMA Press Release ) . ... 2010 , Cicone, Maiolino et al. ... 2012 , Cicone, Maiolino et al. ... Right: observed distribution of the average stellar metallicities of passive and star forming galaxies in the local universe, supporting starvation/strangulation as primary quenching mechanism in low/intermediate mass galaxies ( Peng, Maiolino, Cochrane 2015 ). ...

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• Astrophysics Group Pulsars
• ALMA Phase Calibration Techniques at the Cavendish Astrophysics Group
• Abstract

m31 _B_00098_df.fits TARGET = ' M31 ' / target EXPTIME = 100 . / exposure time (seconds) FILTER = ' (2) B (375-490)' / filter DATE-OBS = ' 2012-11-22T00 :40:42.618' / date of observation (UT) m31 _B_00099_df.fits TARGET = ' M31 ' / target EXPTIME = 100 . / exposure time (seconds) FILTER = ' (2) B (375-490)' / filter DATE-OBS = ' ...

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• http://www.astro.louisville.edu/shared_skies/archive/select/ngc/ngc6888_crescent/20121121/log.txt
• http://www.astro.louisville.edu/shared_skies/archive/select/ngc/ngc1499_california/20121121/log.txt
• http://www.astro.louisville.edu/shared_skies/archive/select/messier/m33/20121121/log.txt

The computed band passes. ... The interim correlator input is filtered by 8 analog filters (50 Mhz wide at the 260 Mhz IF... one for each sub correlator). ... For bandwidths of 25 Mhz and below the real data stream is digitally down converted to complex samples I, Q streams. ... The Top figure is the halfband filter bandpass computed from the filter coefficients. ... The computed filter has aliased power, extra IQ filtering, and two applications of the filter on the resulting real bandpass. ...

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• http://www.naic.edu/~phil/hardware/lbnfb/lbnfb.html
• compare dlpf shapes
• Solar System Studies at AO

MASTER OT J035815.59+214117.9 discovery - dwarf nova outburst MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 03h 58m 15.59s +21d 41m 17.9s on 2015-11-18.89742 UT. The OT unfiltered magnitude is 17.1m (limit 18.1m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2010-12-03.85624 UT with unfiltered magnitude limit 20.2m. Spectral observations are required.

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• MASTER GLOBAL ROBOTIC TELESCOPES NET
• MASTER-Net Science Release on prompt optical observation of the GRB 090424
• Обсерватория

... In one situation, we can use light from quasars to probe the material between us and them because that light may pass through one or more galaxies or gas clouds on its way to us. The gas inside the galaxies or the intergalactic clouds acts then as a filter, absorbing selected wavelengths from the quasar light. ... Light from a quasar must pass through clouds of gas and even faint galaxies -- each leaving its imprint on the light -- before we receive it here on Earth. ... Gravitational lensing . ...

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• ASP: Eclipse Watching: Making a Solar Filter
• ASP: Making a Rainbow
• ASP: An Ancient Universe - Changes in Stars

... The NICMOS Parallel Program . Analysis . ... NICMOS observations made in parallel with the other HST instruments have produced an archive of over 2,000 images, covering a wide range of Galactic latitudes. ... The maximum sensitivity of these images is approximately 0.1 Jy, which should allow the detection of such astrophysically interesting sources as brown dwarfs in the solar neighborhood and star-forming galaxies out to z 3. ...

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• NICMOS Observes the Galactic Center
• Unusual Emission near a Compact Source in Orion
• HST/NICMOS Observations of the Interacting System Arp 299

Atmospheric influence on the different radio-engineering system functioning . ESTIMATION OF ATMOSPHERIC OPTICAL CHARACTERISTICS AND REMOTELY SANSED IMAGE CORRECTION . ... Direct transmittance estimation results for 12 channels of the spectrometer CHRIS. ... We have managed to develop a direct method of estimating the discrete Normalized Atmospheric Point Spread Function (NAPSF) from available images alone, not using any external sources of information about the atmosphere. ... IRE RAS 1996-20 11 ...

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... Exposure Time Calculator (ETC) . ... ESO - Public Surveys . ... the recommended values to use for DIT, . ... Detector on-chip integration (DIT): seconds. to your chosen value - a separate page gives recommended values to use for DIT - for modes 1 and 2 below you may wish to start with the maximum recommended values as these will minimize the effect of read noise (a total object exposure of Y secs with DIT=X secs will produce Y/X lots of read noise) and give you a lower limit on the time needed. ...

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• VISTA - Visible and Infrared Survey Telescope for Astronomy
• Observing with VISTA

CCD Forum Message . Forums: . ... CCD Tips and Techniques | Post . ... Colour Filter On A CCD . ... I was wondering if you could help me with a question I have about colour filters on CCD's: . For a CCD that is using a bayer colour filter on top of the pixel array, i have seen two different ways that this has been arranged: . ... www.astronomy.net . ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

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• A Sensational Discovery - an Astronomy Net Observation_reports Forum Message
• Observation Report On Mars And ... - an Astronomy Net Observation_reports Forum
• Color Filters - an Astronomy Net Eyepieces Forum Message

Astronomes Amateurs du Luxembourg a.s.b.l. " We bring the Universe to you ! Founded in 1971 by a group of enthusiasts and star aficionados, our association is now counting more than 130 members.As a national association we attract hobby astronomers from the whole country to our regular night-sky observations and to the meetings in our club at Dudelange. ... by topic : PDF File Download (360KB) . ... Article about AAL in "Le Quotidien" newspaper of Juli 21 2005 - PDF File Download (132KB) . ...

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• AAL Homepage

... Sky Pollution Rejection Filters and What They Reveal About Nebulae . ... Thursday, Jun 14, 2012 at 8:00 PM . Our speaker will demonstrate how filters such as Orion Telescope's Ultrablock filter allow observers to see emission nebulae clearly even when the sky is polluted because of nearby lighting. ... Please join us for a pre-meeting dinner discussion at Changsho, 1712 Mass Ave, Cambridge, MA at 6:00pm before the meeting. ... Jun . ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

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• Mars pictures from Stellafane by Paul Valleli
• Venus 2004 transit photo collection

The weather throughout this year was so extremely favorable that I have been able to observe the Sun clearly on 312 days; however, I counted only 34 groups of sunspots.. From my earlier observations, which I have reported every year in this journal, it appears that there is a certain periodicity in the appearance of sunspots and this theory seems more and more probable from the results of this year.. ... 244 . ... 149 . ... Exploration" home page (index) Glossary . Official GSFC Home Page .. ...

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• IKI IPL home page
• Brief History: Planetary Magnetospheres
• Plasma Phenomena in the Solar System: Discoveries of Prof. K.I. Gringauz - a

... U filter . UG1 - 1mm . S8612 - 2mm . WG295 - 2mm . ... BG37 - 3mm . BG39 - 1mm . GG395 - 1mm . ... GG495 - 2mm . BG40 - 3mm . ... OG570 - 3mm . KG3 - 2mm . ... RG9 - 2mm . WG305 - 3mm . Bessell, PASP 102 , 1181, (1990) . ... Bessell, PASP 107 , 672, (1995) . APO Filters Homepage ...

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• Apache Point Obs. filters
• ARC 3.5m | GFP
• Astrophysical Research Consortium - Apache Point Observatory

... Observations have received at the telescope AT-64 of the Crimean Astrophysical Observatory . GRB . ... RA(2000): 11h 45m 10.54s . DEC(2000): 17o 24' 34.44" . ... Filter: none . ... Date, time (UT) . Exposure . ... 2000.07.29 18:21:52 . 30 sec . ... RA(2000): 19h 58m 19.61s . DEC(2000): 23o 32' 35.15" . ... 120 sec . ... DEC(2000): 6o 20' 47.07" . ... 240 sec . ... DEC(2000): 51o 46' 34.93" . ... DEC(2000): -13o 04' 30" . ... DEC(2000): +55o 18' 25.0" . ... 2000-11-09T16:03:19 . ...

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• Discovery of the Sunspot Cycle
• Brief History: Planetary Magnetospheres
• "Stargazers" and National Science Standards

... More on 51 Peg: . The discovery of a Jupiter--mass planet in orbit around the solar--type star 51Peg has been reported by Michel Mayor and Didier Queloz (Geneva Observatory) on October 6th at the 9th Cambridge workshop on "cool stars, stellar systems, and the sun" held at Florence (Italy). ... Recall that the measurements of radial velocity only yield v sin i which in turn gives us M sin i. For most values of i, sin i will be greater than 0.5 and this gives a mass estimate of 0.5 Jupiter masses. ...

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• Astro-2 and the UIT Experiment
• Intelligent Life in the Universe
• Physics 301: Great Ideas in Science

National Aeronautics and Space Administration . ... Bruce McCandless II (Captain, USN, Ret.) NASA Astronaut (former) . ... He was a member of the astronaut support crew for the Apollo 14 mission and was backup pilot for the first manned Skylab mission (SL-1/SL-2). ... A veteran of two space flights, McCandless has logged over 312 hours in space, including 4 hours of MMU flight time. ... With the completion of this flight McCandless logged 191 hours in space (including 4 hours of MMU flight time). ...

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• Astronaut Bio: John E. Blaha (05/2008)
• Astronaut Bio: J. M. Linenger 8/01
• Astronaut Bio: Eileen Collins (5/2006)

... Tonight's Sky . ... The Magazine . ... Observing . ... Magazine . ... Gravitational wave search provides insights into galaxy evolution and mergers . ... galaxies . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... Maximize a minimum filter . ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ... Astronomy Magazine . ...

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• How do light pollution filters work? Do they actually help? | Astronomy.com
• Using filters | Astronomy.com
• Why is one of the three filters in the Hubble palette ionized sulfur? Is Sulfur