NOVEMBER 2014 Introduction the Purpose of the Observer’S Challenge Is to Encourage the Pursuit of Visual Observing
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Three Naked Eye Galaxies? Dave Eagle
Three Naked Eye Galaxies? Dave Eagle. Eagleseye Observatory. Star hopping to M31, The Great Andromeda Galaxy. In the autumn sky in the northern hemisphere, the constellations of Perseus and Andromeda are very proudly on display, located on the meridian around midnight, and visible from most of the world. The Great Square of Pegasus is a distinct asterism of four stars. Using just your naked eye, find this square of stars. Incidentally, the top left star (all instructions are now as seen from the northern hemisphere) Sirrah, is now actually Alpha Andromedae. From this square of stars take the top edge of the square and carry the line on towards the left (east) and up. Just under half the distance of the top of the square, you should come to another reasonably bright star. Slightly left and up again, taking a slightly longer journey, you will come to another star of similar brightness. This is Mirach or Beta Andromedae. When you have found this star, turn 90 degrees to the right. You will then see two fairly bright stars leading away. Aim for the second star and gaze at this star. If your skies are reasonably dark, just above and to the right of the second star you should be able to see a faint smudge. This marks the location of M31, The Andromeda Galaxy. In five hops we have found our quarry. Figure 1 – Star hopping from Sirrah to The Andromeda Galaxy. This is the most distant object you can see with the naked eye and is almost 2.5 million light years away. -
Observer Page 2 of 12
AAAssstttrrrooonnnooomyyy CCCllluuubbb ooofff TTTuuulllsssaaa OOOOOObbbbbbsssssseeeeeerrrrrrvvvvvveeeeeerrrrrr January 2009 Picture of the Month Mirach’s Ghost – NGC 404 / Herschel II-224 As far as ghosts go, Mirach's Ghost isn't really that scary. In fact, Mirach's Ghost is just a faint, fuzzy galaxy, well known to astronomers, that happens to be seen nearly along the line-of-sight to Mirach, a bright star. Centered in this star field, Mirach is also called Beta Andromedae. About 200 light-years distant, Mirach is a red giant star, cooler than the Sun but much larger and so intrinsically much brighter than our parent star. In most telescopic views, glare and diffraction spikes tend to hide things that lie near Mirach and make the faint, fuzzy galaxy look like a ghostly internal reflection of the almost overwhelming starlight. Still, appearing in this sharp image just above and to the right, Mirach's Ghost is cataloged as galaxy NGC 404 and is estimated to be some 10 million light-years away. – Explanation from APOD/NASA Credit & Copyright – Anthony Ayiomamitis (Athens, Greece) Website = http://www.perseus.gr/ & eMail = [email protected] Inside This Issue: Important ACT Upcoming Dates: Vice President's Message - p2 IYoA - - - - - - - - - - - - - - - p6 Public Star Party… Fri. January 2, 2009 (p11) Word Search Puzzle - - - - p3 Virtual Moon Atlas - - - - - - p7 ACT Meeting @ TCC - Fri. January 9, ( 7pm ) January Stars - - - - - - - - p4 Observing Pages - - - - pp 8- 9 Members Only Star Party … Fri. January 23, 2009 Planetarium News - - - - - p5 Land’s Tidbits - - - - - - - - p10 ACT Observer Page 2 of 12 Vice President’s Message by Tom Mcdonough Happy New Year to everyone, we have a very exciting year ahead of us! 2009 is the International Year of Astronomy in celebration of the 400th anniversary of Galileo’s observations of the heavens with one of the first telescopes. -
Basics of Astrophysics Revisited. I. Mass- Luminosity Relation for K, M and G Class Stars
Basics of astrophysics revisited. I. Mass- luminosity relation for K, M and G class stars Edgars Alksnis [email protected] Small volume statistics show, that luminosity of slow rotating stars is proportional to their angular momentums of rotation. Cause should be outside of standard solar model. Slow rotating giants and dim dwarfs are not out of „main sequence” in this concept. Predictive power of stellar mass-radius- equatorial rotation speed-luminosity relation has been offered to test in numerous examples. Keywords: mass-luminosity relation, stellar rotation, stellar mass prediction, stellar rotation prediction ...Such vibrations would proceed from deep inside the sun. They are a fast way of transporting large amounts of energy from the interior to the surface that is not envisioned in present theory.... They could stir up the material inside the sun, which current theory tends to see as well layered, and that could affect the fusion dynamics. If they come to be generally accepted, they will require a reworking of solar theory, and that carries in its train a reworking of stellar theory generally. These vibrations could reverberate throughout astronomy. (Science News, Vol. 115, April 21, 1979, p. 270). Actual expression for stellar mass-luminosity relation (fig.1) Fig.1 Stellar mass- luminosity relation. Credit: Ay20. L- luminosity, relative to the Sun, M- mass, relative to the Sun. remain empiric and in fact contain unresolvable contradiction: stellar luminosity basically is connected with their surface area (radius squared) but mass (radius in cube) appears as a factor which generate luminosity. That purely geometric difference had pressed astrophysicists to place several classes of stars outside of „main sequence” in the frame of their strange theoretic constructions. -
Extrasolar Planets and Their Host Stars
Kaspar von Braun & Tabetha S. Boyajian Extrasolar Planets and Their Host Stars July 25, 2017 arXiv:1707.07405v1 [astro-ph.EP] 24 Jul 2017 Springer Preface In astronomy or indeed any collaborative environment, it pays to figure out with whom one can work well. From existing projects or simply conversations, research ideas appear, are developed, take shape, sometimes take a detour into some un- expected directions, often need to be refocused, are sometimes divided up and/or distributed among collaborators, and are (hopefully) published. After a number of these cycles repeat, something bigger may be born, all of which one then tries to simultaneously fit into one’s head for what feels like a challenging amount of time. That was certainly the case a long time ago when writing a PhD dissertation. Since then, there have been postdoctoral fellowships and appointments, permanent and adjunct positions, and former, current, and future collaborators. And yet, con- versations spawn research ideas, which take many different turns and may divide up into a multitude of approaches or related or perhaps unrelated subjects. Again, one had better figure out with whom one likes to work. And again, in the process of writing this Brief, one needs create something bigger by focusing the relevant pieces of work into one (hopefully) coherent manuscript. It is an honor, a privi- lege, an amazing experience, and simply a lot of fun to be and have been working with all the people who have had an influence on our work and thereby on this book. To quote the late and great Jim Croce: ”If you dig it, do it. -
Other Planetary Systems the New Science of Distant Worlds
BENN6189_05_C13_PR5_V3_TT.QXD 10/31/07 8:03 AM Page 394 13 Other Planetary Systems The New Science of Distant Worlds LEARNING GOALS 13.1 Detecting Extrasolar Planets 13.3 The Formation of Other Solar Systems ◗ Why is it so difficult to detect planets around other stars? ◗ Can we explain the surprising orbits of many extrasolar ◗ How do we detect planets around other stars? planets? ◗ Do we need to modify our theory of solar system 13.2 The Nature of Extrasolar Planets formation? ◗ What have we learned about extrasolar planets? ◗ How do extrasolar planets compare with planets in our 13.4 Finding More New Worlds solar system? ◗ How will we search for Earth-like planets? 394 BENN6189_05_C13_PR5_V3_TT.QXD 10/31/07 8:03 AM Page 395 How vast those Orbs must be, and how inconsiderable Before we begin, it’s worth noting that these discoveries this Earth, the Theatre upon which all our mighty have further complicated the question of precisely how we Designs, all our Navigations, and all our Wars are define a planet. Recall that the 2005 discovery of the Pluto- transacted, is when compared to them. A very fit like world Eris [Section 12.3] forced astronomers to recon- consideration, and matter of Reflection, for those sider the minimum size of a planet, and the International Kings and Princes who sacrifice the Lives of so many Astronomical Union (IAU) now defines Pluto and Eris as People, only to flatter their Ambition in being Masters dwarf planets. In much the same way that Pluto and Eris of some pitiful corner of this small Spot. -
Lists and Charts of Autostar Named Stars
APPENDIX A Lists and Charts of Autostar Named Stars Table A.I provides a list of named stars that are stored in the Autostar database. Following the list, there are constellation charts which show where the stars are located. The names are in alphabetical orderalong with their Latin designation (see Appendix B for complete list ofconstellations). Names in brackets 0 in the table denote a different spelling to one that is known in the list. The star's co-ordinates are set to the same as accuracy as the Autostar co-ordinates i.e. the RA or Dec 'sec' values are omitted. Autostar option: Select Item: Object --+ Star --+ Named 215 216 Appendix A Table A.1. Autostar Named Star List RA Dec Named Star Fig. Ref. latin Designation Hr Min Deg Min Mag Acamar A5 Theta Eridanus 2 58 .2 - 40 18 3.2 Achernar A5 Alpha Eridanus 1 37.6 - 57 14 0.4 Acrux A4 Alpha Crucis 12 26.5 - 63 05 1.3 Adara A2 EpsilonCanis Majoris 6 58.6 - 28 58 1.5 Albireo A4 BetaCygni 19 30.6 ++27 57 3.0 Alcor Al0 80 Ursae Majoris 13 25.2 + 54 59 4.0 Alcyone A9 EtaTauri 3 47.4 + 24 06 2.8 Aldebaran A9 Alpha Tauri 4 35.8 + 16 30 0.8 Alderamin A3 Alpha Cephei 21 18.5 + 62 35 2.4 Algenib A7 Gamma Pegasi 0 13.2 + 15 11 2.8 Algieba (Algeiba) A6 Gamma leonis 10 19.9 + 19 50 2.6 Algol A8 Beta Persei 3 8.1 + 40 57 2.1 Alhena A5 Gamma Geminorum 6 37.6 + 16 23 1.9 Alioth Al0 EpsilonUrsae Majoris 12 54.0 + 55 57 1.7 Alkaid Al0 Eta Ursae Majoris 13 47.5 + 49 18 1.8 Almaak (Almach) Al Gamma Andromedae 2 3.8 + 42 19 2.2 Alnair A6 Alpha Gruis 22 8.2 - 46 57 1.7 Alnath (Elnath) A9 BetaTauri 5 26.2 -
December 2019 OBSERVER
THE OBSERVER OF THE TWIN CITY AMATEUR ASTRONOMERS Volume 44, Number 12 December 2019 INSIDE THIS ISSUE: 1«Editor’s Choice: Image of the Month – NGC 7331 2«President’s Note 3«Calendar of Celestial Events – December 2019 3«New & Renewing Members/DUes BlUes/E-Mail List 4«This Month’s Phases of the Moon 4«This Month’s Solar Phenomena 4«TCAA Calendar of Events for 2019-2020 5«MinUtes of the November 5th BoD Meeting 6«AstroBits – News from AroUnd the TCAA 8«TCAA Loses Another Benefactor – Ernie Finnigan 9«Make Plans Now to Attend TCAA AnnUal Meeting 9«December 2019 with Jeffrey Hunt 15«TCAA Active on Facebook 15«Renewing YoUr TCAA Membership 16«E/PO Updates for November 2019 16«Did YoU Know? 17«Public Viewing Sessions for 2020 18«TCAA Image Gallery IMAGE OF THE MONTH: EDITOR’S CHOICE – NGC 7331 « 19 TCAA Treasurer’s Report as of November 26, 2019 This month’s image of NGC 7331 and the sUrroUnding area was taken by Bob Finnigan and Scott Wade on the evenings of November 22 and 23 Using the 14” telescope and new fUll-frame The TCAA is an affiliate of the QHY 367 color camera at PSO. The image shown here consists of Astronomical LeagUe as well as its thirteen 600-second and nine 900-second subs. The image was North Central Region. For more processed by Scott using Pixinsight and Photoshop. information about the TCAA, be NGC 7331 is a spiral galaxy aboUt 40 million light-years away in certain to visit the TCAA website at the constellation of PegasUs. -
Star Name Identity SAO HD FK5 Magnitude Spectral Class Right Ascension Declination Alpheratz Alpha Andromedae 73765 358 1 2,06 B
Star Name Identity SAO HD FK5 Magnitude Spectral class Right ascension Declination Alpheratz Alpha Andromedae 73765 358 1 2,06 B8IVpMnHg 00h 08,388m 29° 05,433' Caph Beta Cassiopeiae 21133 432 2 2,27 F2III-IV 00h 09,178m 59° 08,983' Algenib Gamma Pegasi 91781 886 7 2,83 B2IV 00h 13,237m 15° 11,017' Ankaa Alpha Phoenicis 215093 2261 12 2,39 K0III 00h 26,283m - 42° 18,367' Schedar Alpha Cassiopeiae 21609 3712 21 2,23 K0IIIa 00h 40,508m 56° 32,233' Deneb Kaitos Beta Ceti 147420 4128 22 2,04 G9.5IIICH-1 00h 43,590m - 17° 59,200' Achird Eta Cassiopeiae 21732 4614 3,44 F9V+dM0 00h 49,100m 57° 48,950' Tsih Gamma Cassiopeiae 11482 5394 32 2,47 B0IVe 00h 56,708m 60° 43,000' Haratan Eta ceti 147632 6805 40 3,45 K1 01h 08,583m - 10° 10,933' Mirach Beta Andromedae 54471 6860 42 2,06 M0+IIIa 01h 09,732m 35° 37,233' Alpherg Eta Piscium 92484 9270 50 3,62 G8III 01h 13,483m 15° 20,750' Rukbah Delta Cassiopeiae 22268 8538 48 2,66 A5III-IV 01h 25,817m 60° 14,117' Achernar Alpha Eridani 232481 10144 54 0,46 B3Vpe 01h 37,715m - 57° 14,200' Baten Kaitos Zeta Ceti 148059 11353 62 3,74 K0IIIBa0.1 01h 51,460m - 10° 20,100' Mothallah Alpha Trianguli 74996 11443 64 3,41 F6IV 01h 53,082m 29° 34,733' Mesarthim Gamma Arietis 92681 11502 3,88 A1pSi 01h 53,530m 19° 17,617' Navi Epsilon Cassiopeiae 12031 11415 63 3,38 B3III 01h 54,395m 63° 40,200' Sheratan Beta Arietis 75012 11636 66 2,64 A5V 01h 54,640m 20° 48,483' Risha Alpha Piscium 110291 12447 3,79 A0pSiSr 02h 02,047m 02° 45,817' Almach Gamma Andromedae 37734 12533 73 2,26 K3-IIb 02h 03,900m 42° 19,783' Hamal Alpha -
Brightest Stars : Discovering the Universe Through the Sky's Most Brilliant Stars / Fred Schaaf
ffirs.qxd 3/5/08 6:26 AM Page i THE BRIGHTEST STARS DISCOVERING THE UNIVERSE THROUGH THE SKY’S MOST BRILLIANT STARS Fred Schaaf John Wiley & Sons, Inc. flast.qxd 3/5/08 6:28 AM Page vi ffirs.qxd 3/5/08 6:26 AM Page i THE BRIGHTEST STARS DISCOVERING THE UNIVERSE THROUGH THE SKY’S MOST BRILLIANT STARS Fred Schaaf John Wiley & Sons, Inc. ffirs.qxd 3/5/08 6:26 AM Page ii This book is dedicated to my wife, Mamie, who has been the Sirius of my life. This book is printed on acid-free paper. Copyright © 2008 by Fred Schaaf. All rights reserved Published by John Wiley & Sons, Inc., Hoboken, New Jersey Published simultaneously in Canada Illustration credits appear on page 272. Design and composition by Navta Associates, Inc. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning, or otherwise, except as permitted under Section 107 or 108 of the 1976 United States Copyright Act, without either the prior written permission of the Publisher, or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, (978) 750-8400, fax (978) 646-8600, or on the web at www.copy- right.com. Requests to the Publisher for permission should be addressed to the Permissions Department, John Wiley & Sons, Inc., 111 River Street, Hoboken, NJ 07030, (201) 748-6011, fax (201) 748-6008, or online at http://www.wiley.com/go/permissions. -
The COLOUR of CREATION Observing and Astrophotography Targets “At a Glance” Guide
The COLOUR of CREATION observing and astrophotography targets “at a glance” guide. (Naked eye, binoculars, small and “monster” scopes) Dear fellow amateur astronomer. Please note - this is a work in progress – compiled from several sources - and undoubtedly WILL contain inaccuracies. It would therefor be HIGHLY appreciated if readers would be so kind as to forward ANY corrections and/ or additions (as the document is still obviously incomplete) to: [email protected]. The document will be updated/ revised/ expanded* on a regular basis, replacing the existing document on the ASSA Pretoria website, as well as on the website: coloursofcreation.co.za . This is by no means intended to be a complete nor an exhaustive listing, but rather an “at a glance guide” (2nd column), that will hopefully assist in choosing or eliminating certain objects in a specific constellation for further research, to determine suitability for observation or astrophotography. There is NO copy right - download at will. Warm regards. JohanM. *Edition 1: June 2016 (“Pre-Karoo Star Party version”). “To me, one of the wonders and lures of astronomy is observing a galaxy… realizing you are detecting ancient photons, emitted by billions of stars, reduced to a magnitude below naked eye detection…lying at a distance beyond comprehension...” ASSA 100. (Auke Slotegraaf). Messier objects. Apparent size: degrees, arc minutes, arc seconds. Interesting info. AKA’s. Emphasis, correction. Coordinates, location. Stars, star groups, etc. Variable stars. Double stars. (Only a small number included. “Colourful Ds. descriptions” taken from the book by Sissy Haas). Carbon star. C Asterisma. (Including many “Streicher” objects, taken from Asterism. -
A Primer for the Beginning Astronomer Page 1 Subscribe to Astronomy Or Sky & Telescopemagazine
A SPECIAL PUBLICATION OF A Primer $1.00 This publication is a set of five lessons designed to assist those for the Beginning Astronomer who are just starting out in by John Barra astronomy. These lessons might be equally instructive to those Peoria Astronomical Society who have been trying for a few years to use their own telescopes It does you no good to have a new telescope and a bunch of star atlases if you cannot but have had trouble finding find your way around the sky. My suggestion is this: put away your telescope at first and objects that should be easy to just learn the sky. If the temptation to use your equipment is too great, take your telescope locate. Though full of desire out when the Moon is bright. Gaze at the Moon or at the easy-to-find planets of Venus, and enthusiasm for stargazing, Jupiter, and Saturn. Then put away your telescope for the rest of the month and continue they may have just gotten off on with this first lesson. the wrong foot. Lesson One Learn the Sky The first and most important step in learning the sky is to study the constellations. A good knowledge of the constellations is essential in order to learn how to starhop from object to object, an art that will be explained in a later lesson. Purchase a simple star book that has constellation charts. Observing the Constellations by John Sanford or The Audubon Society Field Guide to the Night Sky by Mark R. Chartrand are two good choices. -
November 2014
Snake River Skies The Newsletter of the Magic Valley Astronomical Society November 2014 Membership Meeting Message from the President – Robert Mayer Saturday, November. 8th 2014 7:00pm at the Herrett Center for Arts & Science Colleagues, College of Southern Idaho. Public Star Party Follows at the November promises to be a busy month. On Saturday, Nov. 8, 7 p.m., at the regular Centennial Obs. monthly meeting, we will have a special presentation on the work of the University of Arizona’s Steward Observatory Mirror Lab, the site for mirror building for several Club Officers: observatories. According to the university’s website, the lab has constructed 14 mirrors ranging from 1.2 to 8.4 meters in diameter. That includes the 3.5-meter Robert Mayer, President mirror for Kitt Peak as well as work for Chilean observatories and the Mount [email protected] Graham, Arizona, Large Binocular telescope that uses two 8.4-meter mirrors. 208-312-1203 Current work includes the Magellan projects – with the biggest project being the Great Magellan Telescope that will consist of seven 8.4-meter mirrors for one Jim Hoggatt, Vice President telescope. Retirees from the lab, Mike Orr and Ray Bertram, will be guiding us [email protected] through the presentation. Orr’s portion will be a first for MVAS – as he will be 208-420-7690 communicating to us through SKYPE. Gary Leavitt, Secretary In addition to the presentation, we need a bit of help. At the November meeting, the [email protected] membership voted to retain the president (Rob Mayer), the secretary (Gary Leavitt), 208-731-7476 and the treasurer (Jim Tubbs).