ATHOS: On-The-Fly Stellar Parameter Determination of FGK Stars Based
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September 2020 BRAS Newsletter
A Neowise Comet 2020, photo by Ralf Rohner of Skypointer Photography Monthly Meeting September 14th at 7:00 PM, via Jitsi (Monthly meetings are on 2nd Mondays at Highland Road Park Observatory, temporarily during quarantine at meet.jit.si/BRASMeets). GUEST SPEAKER: NASA Michoud Assembly Facility Director, Robert Champion What's In This Issue? President’s Message Secretary's Summary Business Meeting Minutes Outreach Report Asteroid and Comet News Light Pollution Committee Report Globe at Night Member’s Corner –My Quest For A Dark Place, by Chris Carlton Astro-Photos by BRAS Members Messages from the HRPO REMOTE DISCUSSION Solar Viewing Plus Night Mercurian Elongation Spooky Sensation Great Martian Opposition Observing Notes: Aquila – The Eagle Like this newsletter? See PAST ISSUES online back to 2009 Visit us on Facebook – Baton Rouge Astronomical Society Baton Rouge Astronomical Society Newsletter, Night Visions Page 2 of 27 September 2020 President’s Message Welcome to September. You may have noticed that this newsletter is showing up a little bit later than usual, and it’s for good reason: release of the newsletter will now happen after the monthly business meeting so that we can have a chance to keep everybody up to date on the latest information. Sometimes, this will mean the newsletter shows up a couple of days late. But, the upshot is that you’ll now be able to see what we discussed at the recent business meeting and have time to digest it before our general meeting in case you want to give some feedback. Now that we’re on the new format, business meetings (and the oft neglected Light Pollution Committee Meeting), are going to start being open to all members of the club again by simply joining up in the respective chat rooms the Wednesday before the first Monday of the month—which I encourage people to do, especially if you have some ideas you want to see the club put into action. -
Snake River Skies the Newsletter of the Magic Valley Astronomical Society
Snake River Skies The Newsletter of the Magic Valley Astronomical Society www.mvastro.org Membership Meeting MVAS President’s Message June 2018 Saturday, June 9th 2018 7:00pm at the Toward the end of last month I gave two presentations to two very different groups. Herrett Center for Arts & Science College of Southern Idaho. One was at the Sawtooth Botanical Gardens in their central meeting room and covered the spring constellations plus some simple setups for astrophotography. Public Star Party Follows at the The other was for the Sun Valley Company and was a telescope viewing session Centennial Observatory given on the lawn near the outdoor pavilion. The composition of the two groups couldn’t be more different and yet their queries and interests were almost identical. Club Officers Both audiences were genuinely curious about the universe and their questions covered a wide range of topics. How old is the moon? What is a star made of? Tim Frazier, President How many exoplanets are there? And, of course, the big one: Is there life out [email protected] there? Robert Mayer, Vice President The SBG’s observing session was rained out but the skies did clear for the Sun [email protected] Valley presentation. As the SV guests viewed the moon and Jupiter, I answered their questions and pointed out how one of Jupiter’s moons was disappearing Gary Leavitt, Secretary behind the planet and how the mountains on our moon were casting shadows into [email protected] the craters. Regardless of their age, everyone was surprised at the details they 208-731-7476 could see and many expressed their amazement at what was “out there”. -
108 Afocal Procedure, 105 Age of Globular Clusters, 25, 28–29 O
Index Index Achromats, 70, 73, 79 Apochromats (APO), 70, Averted vision Adhafera, 44 73, 79 technique, 96, 98, Adobe Photoshop Aquarius, 43, 99 112 (software), 108 Aquila, 10, 36, 45, 65 Afocal procedure, 105 Arches cluster, 23 B1620-26, 37 Age Archinal, Brent, 63, 64, Barkhatova (Bar) of globular clusters, 89, 195 catalogue, 196 25, 28–29 Arcturus, 43 Barlow lens, 78–79, 110 of open clusters, Aricebo radio telescope, Barnard’s Galaxy, 49 15–16 33 Basel (Bas) catalogue, 196 of star complexes, 41 Aries, 45 Bayer classification of stellar associations, Arp 2, 51 system, 93 39, 41–42 Arp catalogue, 197 Be16, 63 of the universe, 28 Arp-Madore (AM)-1, 33 Beehive Cluster, 13, 60, Aldebaran, 43 Arp-Madore (AM)-2, 148 Alessi, 22, 61 48, 65 Bergeron 1, 22 Alessi catalogue, 196 Arp-Madore (AM) Bergeron, J., 22 Algenubi, 44 catalogue, 197 Berkeley 11, 124f, 125 Algieba, 44 Asterisms, 43–45, Berkeley 17, 15 Algol (Demon Star), 65, 94 Berkeley 19, 130 21 Astronomy (magazine), Berkeley 29, 18 Alnilam, 5–6 89 Berkeley 42, 171–173 Alnitak, 5–6 Astronomy Now Berkeley (Be) catalogue, Alpha Centauri, 25 (magazine), 89 196 Alpha Orionis, 93 Astrophotography, 94, Beta Pictoris, 42 Alpha Persei, 40 101, 102–103 Beta Piscium, 44 Altair, 44 Astroplanner (software), Betelgeuse, 93 Alterf, 44 90 Big Bang, 5, 29 Altitude-Azimuth Astro-Snap (software), Big Dipper, 19, 43 (Alt-Az) mount, 107 Binary millisecond 75–76 AstroStack (software), pulsars, 30 Andromeda Galaxy, 36, 108 Binary stars, 8, 52 39, 41, 48, 52, 61 AstroVideo (software), in globular clusters, ANR 1947 -
Making a Sky Atlas
Appendix A Making a Sky Atlas Although a number of very advanced sky atlases are now available in print, none is likely to be ideal for any given task. Published atlases will probably have too few or too many guide stars, too few or too many deep-sky objects plotted in them, wrong- size charts, etc. I found that with MegaStar I could design and make, specifically for my survey, a “just right” personalized atlas. My atlas consists of 108 charts, each about twenty square degrees in size, with guide stars down to magnitude 8.9. I used only the northernmost 78 charts, since I observed the sky only down to –35°. On the charts I plotted only the objects I wanted to observe. In addition I made enlargements of small, overcrowded areas (“quad charts”) as well as separate large-scale charts for the Virgo Galaxy Cluster, the latter with guide stars down to magnitude 11.4. I put the charts in plastic sheet protectors in a three-ring binder, taking them out and plac- ing them on my telescope mount’s clipboard as needed. To find an object I would use the 35 mm finder (except in the Virgo Cluster, where I used the 60 mm as the finder) to point the ensemble of telescopes at the indicated spot among the guide stars. If the object was not seen in the 35 mm, as it usually was not, I would then look in the larger telescopes. If the object was not immediately visible even in the primary telescope – a not uncommon occur- rence due to inexact initial pointing – I would then scan around for it. -
Ngc Catalogue Ngc Catalogue
NGC CATALOGUE NGC CATALOGUE 1 NGC CATALOGUE Object # Common Name Type Constellation Magnitude RA Dec NGC 1 - Galaxy Pegasus 12.9 00:07:16 27:42:32 NGC 2 - Galaxy Pegasus 14.2 00:07:17 27:40:43 NGC 3 - Galaxy Pisces 13.3 00:07:17 08:18:05 NGC 4 - Galaxy Pisces 15.8 00:07:24 08:22:26 NGC 5 - Galaxy Andromeda 13.3 00:07:49 35:21:46 NGC 6 NGC 20 Galaxy Andromeda 13.1 00:09:33 33:18:32 NGC 7 - Galaxy Sculptor 13.9 00:08:21 -29:54:59 NGC 8 - Double Star Pegasus - 00:08:45 23:50:19 NGC 9 - Galaxy Pegasus 13.5 00:08:54 23:49:04 NGC 10 - Galaxy Sculptor 12.5 00:08:34 -33:51:28 NGC 11 - Galaxy Andromeda 13.7 00:08:42 37:26:53 NGC 12 - Galaxy Pisces 13.1 00:08:45 04:36:44 NGC 13 - Galaxy Andromeda 13.2 00:08:48 33:25:59 NGC 14 - Galaxy Pegasus 12.1 00:08:46 15:48:57 NGC 15 - Galaxy Pegasus 13.8 00:09:02 21:37:30 NGC 16 - Galaxy Pegasus 12.0 00:09:04 27:43:48 NGC 17 NGC 34 Galaxy Cetus 14.4 00:11:07 -12:06:28 NGC 18 - Double Star Pegasus - 00:09:23 27:43:56 NGC 19 - Galaxy Andromeda 13.3 00:10:41 32:58:58 NGC 20 See NGC 6 Galaxy Andromeda 13.1 00:09:33 33:18:32 NGC 21 NGC 29 Galaxy Andromeda 12.7 00:10:47 33:21:07 NGC 22 - Galaxy Pegasus 13.6 00:09:48 27:49:58 NGC 23 - Galaxy Pegasus 12.0 00:09:53 25:55:26 NGC 24 - Galaxy Sculptor 11.6 00:09:56 -24:57:52 NGC 25 - Galaxy Phoenix 13.0 00:09:59 -57:01:13 NGC 26 - Galaxy Pegasus 12.9 00:10:26 25:49:56 NGC 27 - Galaxy Andromeda 13.5 00:10:33 28:59:49 NGC 28 - Galaxy Phoenix 13.8 00:10:25 -56:59:20 NGC 29 See NGC 21 Galaxy Andromeda 12.7 00:10:47 33:21:07 NGC 30 - Double Star Pegasus - 00:10:51 21:58:39 -
Stellar Clusters Multicolor Photometry at OAUNI Fotometría Multicolor De
80 A. Pereyra et al. Stellar clusters multicolor photometry at OAUNI Fotometría multicolor de cúmulos estelares en el OAUNI Antonio Pereyra 1,2*, María Isela Zevallos 2 1 Instituto Geofísico del Perú, Área Astronomía, Badajoz 169, Ate, Lima, Perú 2 Facultad de Ciencias, Universidad Nacional de Ingeniería, Av. Túpac Amaru 210, Rímac, Lima, Perú Recibido (Received): 30 / 01 / 2019 Aceptado (Accepted): 31/ 05 / 2019 ABSTRACT In this work we present preliminary analysis of the astronomical photometry program for stellar clusters observed at OAUNI on the last years. Up to date twelve open clusters and nine globular clusters have been observed, in general, in more than one broadband filter. Multicolor photometry for selected clusters is shown along with a color-magnitude diagram for one open cluster. These measurements are the first ones of their kind collected by a peruvian astronomical facility. Keywords: photometry, stellar clusters, open clusters, globular clusters, color-magnitude diagram RESUMEN En este reporte presentamos los análisis preliminares del programa de fotometría astronómica de cúmulos estelares desarrollado en el Observatorio Astronómico de la Universidad Nacional de Ingeniería (OAUNI) durante los últimos años. A la fecha, doce cúmulos abiertos y nueve cúmulos globulares han sido observados, en general, en más de un filtro banda ancha. Se muestra la fotometría multicolor de algunos cúmulos seleccionados y un diagrama color-magnitud para un cúmulo abierto. Estas medidas son las primeras de su tipo a ser realizadas con datos recogidos desde una facilidad astronómica en suelo peruano. Palabras clave: fotometría, cúmulos estelares, cúmulos abiertos, cúmulos globulares, diagrama color-magnitud 1 INTRODUCTION The astronomical photometry applied to stellar The National University of Engineering (UNI in clusters is important because physical parameters can spanish) operates an astronomical observatory at be properly characterized as age and metallicity1. -
Dynamical Modelling of Stellar Systems in the Gaia Era
Dynamical modelling of stellar systems in the Gaia era Eugene Vasiliev Institute of Astronomy, Cambridge Synopsis Overview of dynamical modelling Overview of the Gaia mission Examples: Large Magellanic Cloud Globular clusters Measurement of the Milky Way gravitational potential Fred Hoyle vs. the Universe What does \dynamical modelling" mean? It does not refer to a simulation (e.g. N-body) of the evolution of a stellar system. Most often, it means \modelling a stellar system in a dynamical equilibrium" (used interchangeably with \steady state"). vs. the Universe What does \dynamical modelling" mean? It does not refer to a simulation (e.g. N-body) of the evolution of a stellar system. Most often, it means \modelling a stellar system in a dynamical equilibrium" (used interchangeably with \steady state"). Fred Hoyle What does \dynamical modelling" mean? It does not refer to a simulation (e.g. N-body) of the evolution of a stellar system. Most often, it means \modelling a stellar system in a dynamical equilibrium" (used interchangeably with \steady state"). Fred Hoyle vs. the Universe 3D Steady-state assumption =) Jeans theorem: f (x; v)= f I(x; v;Φ) observations: 3D { 6D integrals of motion (≤ 3D?), e.g., I = fE; L;::: g Why steady state? Distribution function of stars f (x; v; t) satisfies [sometimes] the collisionless Boltzmann equation: @f (x; v; t) @f (x; v; t) @Φ(x; t) @f (x; v; t) + v − = 0: @t @x @x @v Potential , mass distribution @f (x; v; t) ; t ; t ; t + @t 3D observations: 3D { 6D integrals of motion (≤ 3D?), e.g., I = fE; L;::: -
The Origin of Globular Cluster FSR 1758 Fu-Chi Yeh1, Giovanni Carraro1, Vladimir I
A&A 635, A125 (2020) Astronomy https://doi.org/10.1051/0004-6361/201937093 & c ESO 2020 Astrophysics The origin of globular cluster FSR 1758 Fu-Chi Yeh1, Giovanni Carraro1, Vladimir I. Korchagin2, Camilla Pianta1, and Sergio Ortolani1 1 Department of Physics and Astronomy Galileo Galilei, Vicolo Osservatorio 3, 35122 Padova, Italy e-mail: [email protected] 2 Southern Federal University, Rostov on Don, Russian Federation Received 10 November 2019 / Accepted 5 February 2020 ABSTRACT Context. Globular clusters in the Milky Way are thought to have either an in situ origin, or to have been deposited in the Galaxy by past accretion events, like the spectacular Sagittarius dwarf galaxy merger. Aims. We probe the origin of the recently discovered globular cluster FSR 1758, often associated with some past merger event and which happens to be projected toward the Galactic bulge. We performed a detailed study of its Galactic orbit, and assign it to the most suitable Galactic component. Methods. We employed three different analytical time-independent potential models to calculate the orbit of the cluster by using the Gauss Radau spacings integration method. In addition, a time-dependent bar potential model is added to account for the influence of the Galactic bar. We ran a large suite of simulations via a Montecarlo method to account for the uncertainties in the initial conditions. Results. We confirm previous indications that the globular cluster FSR 1758 possesses a retrograde orbit with high eccentricity. The comparative analysis of the orbital parameters of star clusters in the Milky Way, in tandem with recent metallicity estimates, allows us to conclude that FSR 1758 is indeed a Galactic bulge intruder. -
Arxiv:2103.05033V1 [Astro-Ph.GA] 8 Mar 2021 2014; Kremer Et Al
Draft version March 10, 2021 Typeset using LATEX twocolumn style in AASTeX63 Matching Globular Cluster Models to Observations Nicholas Z. Rui,1 Kyle Kremer,1, 2, 3 Newlin C. Weatherford,3 Sourav Chatterjee,4 Frederic A. Rasio,3 Carl L. Rodriguez,5 and Claire S. Ye3 1TAPIR, California Institute of Technology, Pasadena, CA 91125, USA 2The Observatories of the Carnegie Institution for Science, Pasadena, CA 91101, USA 3Center for Interdisciplinary Exploration & Research in Astrophysics (CIERA) and Department of Physics & Astronomy, Northwestern University, Evanston, IL 60208, USA 4Tata Institute of Fundamental Research, Homi Bhabha Road, Navy Nagar, Colaba, Mumbai 400005, India 5Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213 ABSTRACT As ancient, gravitationally bound stellar populations, globular clusters are abundant, vibrant labora- tories characterized by high frequencies of dynamical interactions coupled to complex stellar evolution. Using surface brightness and velocity dispersion profiles from the literature, we fit 59 Milky Way glob- ular clusters to dynamical models from the CMC Cluster Catalog. Without doing any interpolation, and without any directed effort to fit any particular cluster, 26 globular clusters are well-matched by at least one of our models. We discuss in particular the core-collapsed clusters NGC 6293, NGC 6397, NGC 6681, and NGC 6624, and the non-core-collapsed clusters NGC 288, NGC 4372, and NGC 5897. As NGC 6624 lacks well-fitting snapshots on the main CMC Cluster Catalog, we run six additional models in order to refine the fit. We calculate metrics for mass segregation, explore the production of compact object sources such as millisecond pulsars, cataclysmic variables, low-mass X-ray binaries, and stellar-mass black holes, finding reasonable agreement with observations. -
Information Bulletin on Variable Stars
COMMISSIONS AND OF THE I A U INFORMATION BULLETIN ON VARIABLE STARS Nos March November EDITORS L SZABADOS K OLAH TECHNICAL EDITOR A HOLL TYPESETTING K ORI ADMINISTRATION Zs KOVARI EDITORIAL BOARD L A BALONA M BREGER E BUDDING M deGROOT E GUINAN D S HALL P HARMANEC M JERZYKIEWICZ K C LEUNG M RODONO N N SAMUS J SMAK C STERKEN H BUDAPEST XI I Box HUNGARY HU ISSN COPYRIGHT NOTICE IBVS is published on b ehalf of the th and nd Commissions of the IAU by the Konkoly Observatory Budap est Hungary Individual issues could b e downloaded for scientic and educational purp oses free of charge Bibliographic information of the recent issues could b e entered to indexing sys tems No IBVS issues may b e stored in a public retrieval system in any form or by any means electronic or otherwise without the prior written p ermission of the publishers Prior written p ermission of the publishers is required for entering IBVS issues to an electronic indexing or bibliographic system to o CONTENTS E PAUNZEN G HANDLER Pulsation of HD and HD :::: E PAUNZEN WW WEISS R KUSCHNIG Nonvariability among Bo o Star I ESO and Data :::::::::::::::::::::::::::::::::: PA HECKERT Photometry of SV Camelopardalis :::::::::::::::: M WOLF L SAROUNOVA P MOLIK Period Changes in V Ophiuchi ::::::::::::::::::::::::::::::::::::::::::::::::::: ::::::::::::: RM ROBB MD GLADDERS Optical Observations of the Active Star FF Cancri ::::::::::::::::::::::::::::::::::::::::::::::::::: ::::::: U BASTIAN E BORN F AGERER M DAHM V GROSSMANN V MAKAROV Conrmation of the -
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. -
194 9 Ce Le B Rating 65 Ye Ars O F Br Inging As Tr on Omy T O No Rth Te X
1949 Celebrating 65 Years of Bringing Astronomy to North Texas 2014 Contact information: Inside this issue: Info Officer (General Info) – [email protected]@fortworthastro.com Website Administrator – [email protected] Postal Address: Page Fort Worth Astronomical Society Welcome New Members 3 5801 Trail Lake Drive Fort Worth, TX 76133 Monthly Club Calendar 4 Web Site: http://www.fortworthastro.org 19-inch Scope Update 5 Facebook: http://tinyurl.com/3eutb22 Twitter: http://twitter.com/ftwastro Young Astronomer News 6 Yahoo! eGroup (members only): http://tinyurl.com/7qu5vkn Cloudy Night Library 7 Officers (2013-2014): President – Jim Murray, [email protected] AL Club of the Month 10 Vice President – Matt Reed, [email protected] Sec/Tres – Lewis Westerfield, [email protected] The Methuselah Star 11 Board Members: Constellation of the Month 14 2012-2014 Constellation Mythology 17 Phil Stage Bruce Cowles Monthly Celestial Events 18 2013-2015 Monthly All-Sky Chart 19 Bill Nichols Jim Craft Moon Calendar and Data 20 Cover Photo Planet Highlights 21 Composite photos courtesy Mike Jupiter Highlights 22 Jones et al, The 19-inch equatorial reflecting Meeting Minutes 23 telescope that the club has recently acquired. General Club Information 24 That’s A Fact 24 Observing Site Reminders: Be careful with fire, mind all local burn bans! November’s Full Moon 24 Dark Site Usage Requirements (ALL MEMBERS): FWAS Foto Files 25 Maintain Dark-Sky Etiquettehttp://tinyurl.com/75hjajy ( ) Turn out your headlights