THE REFLECTOR Volume 2, Issue 3 January 2003
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Visual Astronomy Filter Research
Visual Astronomy Filter Research by Jim Thompson, P.Eng May 2010 Table of Contents: 1.0 The Great Filter Filibuster ...................................................................................... 3 2.0 The Human Eye...................................................................................................... 5 3.0 Planetary (Colour) Filter Research ......................................................................... 7 4.0 Using Planetary (Colour) Filters........................................................................... 12 5.0 Deep-Sky (Band Pass) Filter Research................................................................. 21 6.0 Using Deep-Sky (Band Pass) Filters..................................................................... 25 7.0 References............................................................................................................. 33 Appendix A – Colour Filter Plots ..................................................................................... 36 Appendix B – Deepsky Filter Plots .................................................................................. 43 List of Figures: Figure 1 An assortment of planetary (colour) filters ...................................................... 3 Figure 2 An example of deep-sky (band-pass) filters..................................................... 4 Figure 3 Human Eye Rod & Cone Density Distribution ................................................ 5 Figure 4 Human Eye Spectral Sensitivity...................................................................... -
Filter Performance Comparisons for Some Common Nebulae
Filter Performance Comparisons For Some Common Nebulae By Dave Knisely Light Pollution and various “nebula” filters have been around since the late 1970’s, and amateurs have been using them ever since to bring out detail (and even some objects) which were difficult to impossible to see before in modest apertures. When I started using them in the early 1980’s, specific information about which filter might work on a given object (or even whether certain filters were useful at all) was often hard to come by. Even those accounts that were available often had incomplete or inaccurate information. Getting some observational experience with the Lumicon line of filters helped, but there were still some unanswered questions. I wondered how the various filters would rank on- average against each other for a large number of objects, and whether there was a “best overall” filter. In particular, I also wondered if the much-maligned H-Beta filter was useful on more objects than the two or three targets most often mentioned in publications. In the summer of 1999, I decided to begin some more comprehensive observations to try and answer these questions and determine how to best use these filters overall. I formulated a basic survey covering a moderate number of emission and planetary nebulae to obtain some statistics on filter performance to try to address the following questions: 1. How do the various filter types compare as to what (on average) they show on a given nebula? 2. Is there one overall “best” nebula filter which will work on the largest number of objects? 3. -
RASC Toronto Centre Members Night - February, 2016 - Observing Targets*
RASC Toronto Centre Members Night - February, 2016 - Observing Targets* By Chris Vaughan [email protected] *see January Observing Targets List for additional excellent targets in the constellations covered below Emphasis is on the must-sees and some overlooked gems and fun items seen only in winter (i.e., not circumpolar). For deep sky objects “M” designates Messier List object, “C” Caldwell List Object, “NGC” New General Catalogue, “IC” Index Catalogue for nebulae, and “Melotte” Open Cluster Catalogue. For stars, I give the proper names (spellings may vary) or nicknames, plus Bayer designation (Greek letter plus Latin constellation name) and/or Flamsteed designation (numeral and Latin constellation name), and the visual magnitude “mag”. For doubles/multiples I have provided mags, separations “sep” in minutes (‘) or seconds (“), colours, etc. O-III and UHC filters will enhance nebulae by darkening surrounding the sky and stars. Planetary nebula benefit especially well, and cloud shapes become more apparent. Place the filter and re-focus after first finding/viewing the object without any filtering. Monoceros (Monocerotis) Beta Mon – Triple star system composed of three equally bright (mag 4.6, 5.4, 5.6) hot blue-white stars, where the third orbits the other pair Plaskett’s Star (V640 Mon) – One of the most massive binary stars known (mag 6), discovered by Canadian John Stanley Plaskett in 1922 Seagull Nebula / IC2177 / NGC2327 – Very large (120’x40’) and bright (mag 10) nebula containing H- alpha clouds, some blue reflection nebulosity, dust lanes, and stars. Imaging target and try visually with O-III filter Cone Nebula and Christmas Tree Cluster / NGC2264 - Bright (mag 3.9) cluster of stars in a 30’ field (easy in binoculars) near the eastern edge of a large area (60’x30’) of tenuous nebulosity. -
Gemini Deutscher Name: Zwillinge Gem Atlas (2000.0)
Lateinischer Name: Deutscher Name: Gem Gemini Zwillinge Atlas (2000.0) Karte Cambridge Star Kulmination um 3, 9 Atlas Mitternacht: Benachbarte 5, 6, 11, Sky Atlas Sternbilder: 12 Aur Cnc CMi Lyn 4. Januar Mon Ori Tau Deklinationsbereich: 10° ... 35° Fläche am Himmel: 514° 2 Mythologie und Geschichte: Castor und Pollux waren schon in vielen Kulturen als Zwillinge bekannt. Manchmal wurden sie auch Die Dioscuri oder die Söhne des Zeus, des Königs der Götter bezeichnet. Ihre Mutter war die wunderschöne Leda, der Zeus in der Gestalt eines Schwans erschien. Pollux besaß eine unsterbliche Seele; bei seinem Tode war ihm ein Zuhause auf dem Olymp zugesprochen. Castor jedoch war sterblich. Einige sagten, Castors Vater wäre nicht der mächtige Zeus gewesen, sondern der irdische König Tyndareos von Sparta. Somit war Castor, wie auch der übrigen Menschheit, die Unterwelt von Hades als allerletzte Ruhestätte bestimmt. Diese Welt des Todes war kein Platz der Bestrafung wie in der christlichen Vorstellung, sondern ein Platz unablässiger Teilnahmslosigkeit und Langeweile. Castor zeichnete sich in der Reitkunst aus, während sich Pollux im Boxen und im Kämpfen von Schlachten bewährte. Man erzählte sich, die beiden wären sich so ähnlich, wie es nur Zwillinge sein könnten. Beide heirateten die hübschen Töchter eines Königs von Sparta. Ein trauriger Tag kam, als während eines Aufruhrs eine Lanze Castors Herz durchbohrte. Pollux begriff, dass nun sein Zwillingsbruder für immer im Hades verweilen würde. Er bat Zeus, ihn zusammen mit ihm in die Unterwelt zu senden. Zeus war aber nicht fähig diese Bitte zu gewähren. Er versprach jedoch Pollux, dass er und sein Bruder Castor die Hälfte ihrer Zeit auf dem Olymp und die andere Hälfte im Hades, verbringen würden. -
Filters Table
#8 #11 #12 #15 #21 #23A #25 #29 #38A #47 #56 #58 #80A #82A ND13 Light Yellow- Yellow Dark Orange Light Red Dark Dark Violet Light Green Blue Light Blue Neutral Yellow Green Yellow Red Red Blue Green Density Moon: Detail Feature Contrast Low Contrast Features Glare Reduction Mercury: Planet/Sky Contrast Features Venus: Planet/Sky Contrast Clouds Terminator Mars: Clouds Maria Blue-Green Areas Dust Storms Polar Caps Low Contrast Features Jupiter: Clouds Belts Rilles Festoons Atmosphere Red-Orange Features Orange-Red Zonal Red/Blue Contrast Blue/Light Contrast Great Red Spot Galilean Moon Transits #8 #11 #12 #15 #21 #23A #25 #29 #38A #47 #56 #58 #80A #82A ND13 Light Yellow- Yellow Dark Orange Light Red Red Dark Dark Violet Light Green Blue Light Blue Neutral Yellow Green Yellow Red Blue Green Density Jupiter: Red/Blue/Light Contrast Polar Regions Disc Low Contrast Features Saturn: Clouds Belts Polar Regions Rings Cassini Division Red/Blue Contrast Red/Orange Features Low Contrast Features Uranus: Dusky Detail Neptune: Dusky Detail Double Stars: Bright Primary H- Deep H- Deep H- Deep UHC O-III UHC O-III UHC O-III Beta Sky Beta Sky Beta Sky Nebula: Nebula: Nebula: M1 Crab nebula NGC2436 NGC7822 M8 Lagoon Nebula NGC2438 in M46 IC405 Flaming Star Nebula M16 Eagle Nebula NGC2440 IC410 M17 Swan Nebula NGC3242 Ghost of Jupiter IC417 H-Beta M20 Trifid Nebula NGC4361 IC434/B33 Horsehead Nebula M27 Dumbbell Nebula NGC6210 IC1318 M42 Orion Nebula NGC6302 -
Observer's Handbook 1989
OBSERVER’S HANDBOOK 1 9 8 9 EDITOR: ROY L. BISHOP THE ROYAL ASTRONOMICAL SOCIETY OF CANADA CONTRIBUTORS AND ADVISORS Alan H. B atten, Dominion Astrophysical Observatory, 5071 W . Saanich Road, Victoria, BC, Canada V8X 4M6 (The Nearest Stars). L a r r y D. B o g a n , Department of Physics, Acadia University, Wolfville, NS, Canada B0P 1X0 (Configurations of Saturn’s Satellites). Terence Dickinson, Yarker, ON, Canada K0K 3N0 (The Planets). D a v id W. D u n h a m , International Occultation Timing Association, 7006 Megan Lane, Greenbelt, MD 20770, U.S.A. (Lunar and Planetary Occultations). A lan Dyer, A lister Ling, Edmonton Space Sciences Centre, 11211-142 St., Edmonton, AB, Canada T5M 4A1 (Messier Catalogue, Deep-Sky Objects). Fred Espenak, Planetary Systems Branch, NASA-Goddard Space Flight Centre, Greenbelt, MD, U.S.A. 20771 (Eclipses and Transits). M a r ie F i d l e r , 23 Lyndale Dr., Willowdale, ON, Canada M2N 2X9 (Observatories and Planetaria). Victor Gaizauskas, J. W. D e a n , Herzberg Institute of Astrophysics, National Research Council, Ottawa, ON, Canada K1A 0R6 (Solar Activity). R o b e r t F. G a r r i s o n , David Dunlap Observatory, University of Toronto, Box 360, Richmond Hill, ON, Canada L4C 4Y6 (The Brightest Stars). Ian H alliday, Herzberg Institute of Astrophysics, National Research Council, Ottawa, ON, Canada K1A 0R6 (Miscellaneous Astronomical Data). W illiam H erbst, Van Vleck Observatory, Wesleyan University, Middletown, CT, U.S.A. 06457 (Galactic Nebulae). Ja m e s T. H im e r, 339 Woodside Bay S.W., Calgary, AB, Canada, T2W 3K9 (Galaxies). -
Astronomy Magazine 2012 Index Subject Index
Astronomy Magazine 2012 Index Subject Index A AAR (Adirondack Astronomy Retreat), 2:60 AAS (American Astronomical Society), 5:17 Abell 21 (Medusa Nebula; Sharpless 2-274; PK 205+14), 10:62 Abell 33 (planetary nebula), 10:23 Abell 61 (planetary nebula), 8:72 Abell 81 (IC 1454) (planetary nebula), 12:54 Abell 222 (galaxy cluster), 11:18 Abell 223 (galaxy cluster), 11:18 Abell 520 (galaxy cluster), 10:52 ACT-CL J0102-4915 (El Gordo) (galaxy cluster), 10:33 Adirondack Astronomy Retreat (AAR), 2:60 AF (Astronomy Foundation), 1:14 AKARI infrared observatory, 3:17 The Albuquerque Astronomical Society (TAAS), 6:21 Algol (Beta Persei) (variable star), 11:14 ALMA (Atacama Large Millimeter/submillimeter Array), 2:13, 5:22 Alpha Aquilae (Altair) (star), 8:58–59 Alpha Centauri (star system), possibility of manned travel to, 7:22–27 Alpha Cygni (Deneb) (star), 8:58–59 Alpha Lyrae (Vega) (star), 8:58–59 Alpha Virginis (Spica) (star), 12:71 Altair (Alpha Aquilae) (star), 8:58–59 amateur astronomy clubs, 1:14 websites to create observing charts, 3:61–63 American Astronomical Society (AAS), 5:17 Andromeda Galaxy (M31) aging Sun-like stars in, 5:22 black hole in, 6:17 close pass by Triangulum Galaxy, 10:15 collision with Milky Way, 5:47 dwarf galaxies orbiting, 3:20 Antennae (NGC 4038 and NGC 4039) (colliding galaxies), 10:46 antihydrogen, 7:18 antimatter, energy produced when matter collides with, 3:51 Apollo missions, images taken of landing sites, 1:19 Aristarchus Crater (feature on Moon), 10:60–61 Armstrong, Neil, 12:18 arsenic, found in old star, 9:15 -
Astronomy 2009 Index
Astronomy Magazine 2009 Index Subject Index 1RXS J160929.1-210524 (star), 1:24 4C 60.07 (galaxy pair), 2:24 6dFGS (Six Degree Field Galaxy Survey), 8:18 21-centimeter (neutral hydrogen) tomography, 12:10 93 Minerva (asteroid), 12:18 2008 TC3 (asteroid), 1:24 2009 FH (asteroid), 7:19 A Abell 21 (Medusa Nebula), 3:70 Abell 1656 (Coma galaxy cluster), 3:8–9, 6:16 Allen Telescope Array (ATA) radio telescope, 12:10 ALMA (Atacama Large Millimeter/sub-millimeter Array), 4:21, 9:19 Alpha (α) Canis Majoris (Sirius) (star), 2:68, 10:77 Alpha (α) Orionis (star). See Betelgeuse (Alpha [α] Orionis) (star) Alpha Centauri (star), 2:78 amateur astronomy, 10:18, 11:48–53, 12:19, 56 Andromeda Galaxy (M31) merging with Milky Way, 3:51 midpoint between Milky Way Galaxy and, 1:62–63 ultraviolet images of, 12:22 Antarctic Neumayer Station III, 6:19 Anthe (moon of Saturn), 1:21 Aperture Spherical Telescope (FAST), 4:24 APEX (Atacama Pathfinder Experiment) radio telescope, 3:19 Apollo missions, 8:19 AR11005 (sunspot group), 11:79 Arches Cluster, 10:22 Ares launch system, 1:37, 3:19, 9:19 Ariane 5 rocket, 4:21 Arianespace SA, 4:21 Armstrong, Neil A., 2:20 Arp 147 (galaxy pair), 2:20 Arp 194 (galaxy group), 8:21 art, cosmology-inspired, 5:10 ASPERA (Astroparticle European Research Area), 1:26 asteroids. See also names of specific asteroids binary, 1:32–33 close approach to Earth, 6:22, 7:19 collision with Jupiter, 11:20 collisions with Earth, 1:24 composition of, 10:55 discovery of, 5:21 effect of environment on surface of, 8:22 measuring distant, 6:23 moons orbiting, -
Popular Names of Deep Sky (Galaxies,Nebulae and Clusters) Viciana’S List
POPULAR NAMES OF DEEP SKY (GALAXIES,NEBULAE AND CLUSTERS) VICIANA’S LIST 2ª version August 2014 There isn’t any astronomical guide or star chart without a list of popular names of deep sky objects. Given the huge amount of celestial bodies labeled only with a number, the popular names given to them serve as a friendly anchor in a broad and complicated science such as Astronomy The origin of these names is varied. Some of them come from mythology (Pleiades); others from their discoverer; some describe their shape or singularities; (for instance, a rotten egg, because of its odor); and others belong to a constellation (Great Orion Nebula); etc. The real popular names of celestial bodies are those that for some special characteristic, have been inspired by the imagination of astronomers and amateurs. The most complete list is proposed by SEDS (Students for the Exploration and Development of Space). Other sources that have been used to produce this illustrated dictionary are AstroSurf, Wikipedia, Astronomy Picture of the Day, Skymap computer program, Cartes du ciel and a large bibliography of THE NAMES OF THE UNIVERSE. If you know other name of popular deep sky objects and you think it is important to include them in the popular names’ list, please send it to [email protected] with at least three references from different websites. If you have a good photo of some of the deep sky objects, please send it with standard technical specifications and an optional comment. It will be published in the names of the Universe blog. It could also be included in the ILLUSTRATED DICTIONARY OF POPULAR NAMES OF DEEP SKY. -
The Magic Valley Astronomical Society Notes from the President February
February Highlights Notes from the President Feb. 1st, 6:45 to 9:00 PM Our first general membership meeting for the New Year will be held at 7:00 P.M. on Satur- Family night telescope day the 12th of February, 2011. We will be meeting at the Herrett Center, on the College of viewing. Centennial Obs. Southern Idaho Campus. Admission: $1.50, free for children 6 and under. Free Tom Gilbertson will host our annual telescope workshop "I Have a New Telescope, Now with paid planetarium admis- What?" If you are new to the hobby or if you have new equipment that you would like as- sion. sistance in learning how to operate, please bring it along (as well as any instruction manu- als) and our members will be happy to provide you with whatever assistance is required. Feb 12th, 7:00 pm to mid- This event is open to the general public and we encourage non-members to join us for this night Monthly Membership evening. General Meeting and Monthly free star party. Members in attendance will pair off with new (or old) telescope owners during the break- out sessions and teach them how to operate their new telescope (or old). We could use a Feb 15th, 7:00 to 9:00 PM lot of help from our members, so that no one has to wait to be helped. We had a good turn Family night telescope out last year and we expect more this year as well. Following the meeting we will take viewing. Centennial Obs. everyone with their telescopes up to the Stargazer’s Deck at the Centennial Observatory Admission: $1.50, free for for a evening of observing. -
P.Lightsey: Astronomy from Space
The Objective View April 2012 Newsletter of the Northern Colorado Astronomical Society Robert Grover, President pres@ Tom Teters, Vice President 970 482 5702 Other Events vp@ Dave Chamness, Secretary and AL Correspondent Chamberlin Observatory Open House, 7 to 10 pm Apr 28, May 26, Jun 23, Jul 28 sec@ 970 482 1794 303 871 5172 http://www.du.edu/~rstencel/Chamberlin/ Dave Auter, Treasurer 970 204 6919 treas@ Cheyenne Astronomical Society 7 pm April 20 Greg Halac, Web Editor and Outreach Coordinator http://home.bresnan.net/~curranm/ outreach@ 970 223 7210 Dan Laszlo, Newsletter Editor CSU Madison Macdonald Observatory Public Nights On East Drive, north of Pitkin Street objview@ office 970 498 9226 Tuesdays after dusk if clear, when class is in session append ncastro.org to complete email address Estes Park Memorial Observatory EVAS meeting, 7 pm April 26 TBA http://www.angelsabove.org/ Next Meeting: April 5 7:30 pm Little Thompson Observatory, Berthoud 7 pm April 20 Virgo Walkabout http://www.starkids.org By Tom Fay, Hewlett-Packard Longmont Astronomical Society 7 pm April 19 TBA President’s Room, Dickens Tavern, 300 Main St Club Business at 7:15 pm http://www.longmontastro.org/ Coors Room, McKee Conference Center 2000 N Boise Ave, Loveland CO March 1 Program: Astronomy from Space: Where Have We Been? Where Are We Headed? Enter campus at 19th and Boise. Drive to Wellness Center By Dr. Paul Lightsey, Ball Aerospace Parking north of the buildings. Enter Wellness Center at its NW corner and proceed straight to the Coors Room. Astronomy is the study of objects in the sky well beyond the Earth. -
February 2017 BRAS Newsletter
JanuaryOctober 2017 2016 Issue Issue Next Meeting: Monday, February 13th at 7PM at HRPO nd (2 Mondays, Highland Road Park Observatory) The first eclipse over the USA is only 6 months away, on August 21, 2017. Merrill Hess will speak on what to expect, how to prepare for it, best places to observe it, travel plans, etc. Come get his expert advice. What's In This Issue? President’s Message In Memory of Wally Pursell Secretary's Summary of December Meeting Outreach Report Sidewalk Astronomy Photos 1/3/17 Light Pollution Committee Report Recent Forum Entries 20/20 Vision Campaign Messages from the HRPO Observing Notes – Gemini – The Twins & Mythology Newsletter of the Baton Rouge Astronomical Society February 2017 President’s Message By now, most BRAS members know that the weekend retreat at Rockefeller Refuge was cancelled by the State because of ongoing major construction and cannot be used this month. Our first Sidewalk Astronomy, for 2017, held at Perkins Rowe in January, saw about 170 people looking through our telescopes. Our second Sidewalk Astronomy is scheduled for February 7th, a Tuesday, at Perkins Rowe again. See the report, notices and photos by our Outreach Coordinator, Ben Toman. Our own BRAS Member, Dr. Brad Schaefer, now has a “Great Courses” available, titled “The Remarkable Science of Ancient Astronomy” .I have not watched the 24 lectures yet, but I have read the Course Guidebook. I definitely recommend this course to anyone who is interested in Astronomy and its history. I plan to re-read the guide book as I watch the lectures.