December 2019 AMATEUR ASTRONOMICAL SOCIETY of RHODE ISLAND  47 PEEPTOAD ROAD  NORTH SCITUATE, RHODE ISLAND 02857 

Total Page:16

File Type:pdf, Size:1020Kb

December 2019 AMATEUR ASTRONOMICAL SOCIETY of RHODE ISLAND  47 PEEPTOAD ROAD  NORTH SCITUATE, RHODE ISLAND 02857  the vol. 46 no. 12 Skyscraper December 2019 AMATEUR ASTRONOMICAL SOCIETY OF RHODE ISLAND 47 PEEPTOAD ROAD NORTH SCITUATE, RHODE ISLAND 02857 WWW.THESKYSCRAPERS.ORG In This Issue: 2 President’s Message Saturday, December 14, 5:00pm 2 Jim Hendrickson Wins at North Scituate Community House AstroLeague Webmaster Award The Apollo Lunar Module in Detail by John Kocur 3 Decoding the Star of Bethlehem 5:00 PM Pot Luck Dinner** 4 Geminid Meteor Shower **Participants are asked to RSVP ([email protected]) with the type of food Mooned Out and Other they plan to bring. Categories include: ap- Celestial Offerings petizers, main dishes, side dishes, desserts. 5 Vesta: The Brightest Asteroid Cold drinks, coffee, plates, etc, will be 6 NASA Night Sky Notes: The provided. Please bring an extension if you need to Orion Nebula: plug in an appliance. Window Into a Stellar Nursery All are welcome! 7 IC 1805: Emission 6:15 PM Speaker John Kocur Nebula in Cassiopeia In celebration of the 50th anniversary of 8 The Sun, Moon & Planets the Apollo 11 mission, on Saturday, Decem- in December ber 14 at the Scituate Community Center, 10 Transit of Mercury Skyscraper member John Kocur will give a Photo Gallery PowerPoint presentation about the Apollo Lunar Module. He will cover many interest- 12 November Reports ing and little known facts about the Apollo 13 Quest for the Northern 11 lunar lander, it's development, systems, Lights: 2020 Iceland Trip hardware, equipment, mission, and the fu- ture of new missions. Many rare photos and researched details will be displayed. Skyscrapers John, an avid amateur astronomer, is a long time member of Skyscrapers and Board Meeting has a passion for the manned exploration Monday, December 9, 7pm at of space since the beginning of the NASA Ladd Observatory Mercury program. His interest and knowl- All Members Welcome edge will touch on topics and facts that will give everyone a new view of what it took to Phases of the Moon get to the Moon. First Quarter Moon December 4 06:58 Full Cold Moon December 12 05:12 Seagrave Memorial Observatory Last Quarter Moon Open Nights December 19 04:57 Saturdays at 7:00 pm New Moon weather & conditions permitting December 26 05:13 President’s Message see and above so much of the murk along by Steve Hubbard the horizon. Let’s hope that this time there won’t be a planet straddling all obscuring As I look back on 2019, it’s been the We are going into the winter now and dust storm to block out the details! usual mixed bag for us New England as- the cold, snow and ice will limit our op- Another observing opportunity for us tronomers. Overall, the weather improved portunities for a while. That’s hard, but in will be on December 21 when Jupiter and over that in 2018 such that we didn’t have to looking towards 2020, I see some other Saturn join together in a so called “Great cancel any meetings due to rain storms or opportunities ahead that are something to Conjunction.” This hasn’t happened since snow. Astroassembly this year had some of look forward to. the year 2000. Both planets will be only 7 the best weather I can remember. One of the things I’m most enthused arcminutes apart and will look like a very Then, just as we were going into a pro- about is the upcoming opposition of Mars bright object in the west after sunset. longed stretch of decent weather this Fall, in October. Mars will be much higher in the There are some other things to look for- the EEE virus threat hit. We had to close sky for us here in the northern hemisphere ward to in 2020, but for me these so far are the observatory as a precaution for many and will be well placed in Pisces when at it’s the highlights. Hopefully 2020 will bring us weeks. I guess that’s what happens when closest. It will shine brightly at magnitude many other opportunities and wonderful you have an observatory next to a pond -2.6 and will be 22.4 arcseconds across. celestial highlights to share. and down the street from a horse stable or That is almost as good as it was a couple of See you at our annual Holiday Gala on 2, sigh… years ago. It will just be a lot easier for us to Saturday, December 14! Jim Hendrickson Wins AstroLeague Webmaster Award by Francine Jackson Congratulations are in order to Jim Hen- drickson who was awarded the Astronom- ical League's First Place Webmaster Award for 2019. With over 300 astronomical soci- eties and 18,000 members to choose from, Jim's work on the Skyscrapers website was deemed outstanding. Jim is also Skyscrapers, Inc.'s, newsletter editor. Thanks for your great work for the organization! The Skyscraper is published President Outreach Chairperson monthly by Skyscrapers, Inc. Steve Hubbard [email protected] Linda Bergemann [email protected] Meetings are held monthly, usually on the first or second 1st Vice President Observatory Committee Chairperson Friday or Saturday of the month. Jim Hendrickson [email protected] Jeff Padell [email protected] Seagrave Memorial Observatory is open every Saturday night, 2nd Vice President New Member Steward weather permitting. Bob Horton [email protected] Tracy Prell [email protected] Directions Secretary Librarian Directions to Seagrave Memorial Observatory are Kathy Siok [email protected] Dave Huestis [email protected] located on the back page of this newsletter. Treasurer Assistant Librarian Submissions Submissions to The Skyscraper are always welcome. Matt Ouellette [email protected] Weston Ambrose Please submit items for the newsletter no later than December 15 to Jim Hendrickson, 1 Sunflower Cir- Members at Large Historian cle, North Providence, RI 02911 or e-mail to jim@ Bob Janus [email protected] Dave Huestis [email protected] distantgalaxy.com. Lloyd Merrill [email protected] Editor E-mail subscriptions Trustees Jim Hendrickson [email protected] To receive The Skyscraper by e-mail, send e-mail Jeff Padell [email protected] with your name and address to jim@distantgalaxy. Astronomical League Correspondent (ALCor) com. Note that you will no longer receive the news- Jim Crawford [email protected] Jeff Padell [email protected] letter by postal mail. 2 The Skyscraper December 2019 Decoding the Star of Bethlehem by Francine Jackson A lot of planetariums still spend sever- served the sky, and the conclusion, even to with respect to the planet Venus?” She nev- al weeks before the holiday season putting this day, that the general population really er called again. together their annual Star of Bethlehem doesn’t notice typical celestial phenomena, All of us at Skyscrapers hope you are en- (SOB) or Star of Wonder (SOW) show, as noted by a former astronomy professor, joying the beauty of the sky, and that your trying their best to determine a natural who received a call one morning, stating holiday season is the best ever. rationale for what the Magi were said led she had seen a UFO the night before, and them to the creche. Of course, many astro- wanted him to identify it for her. As it was Francine Jackson is a NASA Solar nomical phenomena have been canceled in the western sky, and Venus was very System Ambassador, writes the out, either as too rapid, such as a meteor, prominent, he informed her as such. Th e weekly newsletter for Ladd something that could have been seen and next morning, she called again, swearing Observatory and teaches astronomy at the reported more than just by these travelers, the object was still there. Again, he told her Community College of Rhode Island. See a comet for instance, but that, had it been it was Venus. Th e next morning, she called more at http://theskyscrapers.org/fran- visible, would have not moved as a “guid- again. Th is time, he asked her, “Where is it cine-jackson ing light,” plus it would most likely have been documented by others, or a superno- va, which likewise would not have moved around the sky to be used as a pointer. Th e most ideal situation, according to modern lore, is a conjunction of planets, a couple of which have been documented to occur around the time of the Birth. Th e two major candidates are a triple conjunction of Jupi- ter and Saturn, with Mars joining the pair at the last, around 8-6 B.C., or one involving Jupiter and the star Regulus, the heart of Leo, the Lion, which, at the last, included the addition of Venus, making for a striking arrangement, about 2-1 B.C. Planets have been oft en considered the natural occurrence of choice, if indeed it did happen, for several reasons, includ- ing the fact that the Magi were, according This simulated view from Stellarium shows a very close conjunction of Venus and Jupiter on the to legend, astrologers, who carefully ob- evening of June 17, 2 BC. A conjunction of Jupiter and Saturn occurred in early December, 7 BC. A similar conjunction will occur on December 21, 2020. The Skyscraper December 2019 3 Geminid Meteor Shower Mooned Out and Other Celestial Off erings by Dave Huestis As quickly as it started, 2019 will soon be sion of my latest treatise on this topic can on December 28, look towards the south- in the history books. I for one am happy to be found on the Skyscrapers website http:// west sky. A waxing crescent Moon will be a see it go.
Recommended publications
  • EMBEDDED CLUSTERS in the LARGE MAGELLANIC CLOUD by Krista Romita Grocholski August 2017 Chair: Elizabeth A
    EMBEDDED CLUSTERS IN THE LARGE MAGELLANIC CLOUD By KRISTA ROMITA GROCHOLSKI A DISSERTATION PRESENTED TO THE GRADUATE SCHOOL OF THE UNIVERSITY OF FLORIDA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY UNIVERSITY OF FLORIDA 2017 c 2017 Krista Romita Grocholski To- Aaron, Allegra, Mom, and Dad. All is possible with you at my side. Thank you. ACKNOWLEDGMENTS First, I would like to acknowledge the University of Florida Astronomy Department for providing me with the opportunity to complete my dissertation. I would like to thank Dr. Elizabeth Lada for taking me on as her graduate student, and for giving me the opportunity and freedom to become a confident, independent researcher. I would also like to thank Drs. Ata Sarajadini, Anthony Gonzalez, and Alessandro Forte for serving on my committee. I would like to give special thanks to Dr. Maria-Rosa Cioni; without your generous collaboration this dissertation project would not be possible. Drs. Margaret Meixner and Lynn Carlson deserve considerable credit for getting me started, not only in astronomy research, but in the wonderful field of star formation in the Large Magellanic Cloud. I will always be grateful for your support and friendship over the years. I would also like to acknowledge Dr. Igor Mikolic-Torreira for giving me the opportunity to apply my research skills beyond the realm of academia. Your guidance and enthusiastic support opened doors to me that changed the nature of my career. I cannot thank you enough. To my fellow UF Astronomy graduate students, the community you have created is something I am proud to have been a part of.
    [Show full text]
  • In the Heart of the Orion Nebula 2 April 2009
    In the heart of the Orion Nebula 2 April 2009 technique allows astronomers to combine the light from several telescopes, forming a huge virtual telescope with a resolving power corresponding to that of a single telescope with 200 m diameter. The Very Large Telescope Interferometer (VLTI) now offers this revolutionary technique to European astronomers and allows them to directly reconstruct images from the interferometric infrared data. A team of European astronomers utilized the VLTI and its near-infrared beam-combination instrument AMBER to demonstrate the imaging capabilities of this unique facility and to study the intriguing Zooming in the centre of the Orion star-forming region massive young star Theta1 Ori C in unprecedented with the four bright Trapezium stars (Theta 1 Ori A-D). detail. The dominant star is Theta 1 Ori C, which was imaged with unprecedented resolution with the VLT Theta 1 Ori C is the dominant and most luminous interferometer (lower right). Image: MPIfR/Stefan Kraus, star in the Orion star-forming region. Located at a ESO and NASA/Chris O'Dell distance of only about 1300 light years, it is the nearest region where massive stars are born and provides a unique laboratory to study the formation process of high-mass stars in detail. The intense (PhysOrg.com) -- A team of astronomers, led by radiation of Theta 1 Ori C is ionizing the whole Stefan Kraus and Gerd Weigelt from the Max- Orion nebula. With its strong wind, the star also Planck-Institute for Radio Astronomy (MPIfR) in shapes the famous Orion proplyds, young stars still Bonn, used ESO's Very Large telescope surrounded by their protoplanetary dust disks.
    [Show full text]
  • 00E the Construction of the Universe Symphony
    The basic construction of the Universe Symphony. There are 30 asterisms (Suites) in the Universe Symphony. I divided the asterisms into 15 groups. The asterisms in the same group, lay close to each other. Asterisms!! in Constellation!Stars!Objects nearby 01 The W!!!Cassiopeia!!Segin !!!!!!!Ruchbah !!!!!!!Marj !!!!!!!Schedar !!!!!!!Caph !!!!!!!!!Sailboat Cluster !!!!!!!!!Gamma Cassiopeia Nebula !!!!!!!!!NGC 129 !!!!!!!!!M 103 !!!!!!!!!NGC 637 !!!!!!!!!NGC 654 !!!!!!!!!NGC 659 !!!!!!!!!PacMan Nebula !!!!!!!!!Owl Cluster !!!!!!!!!NGC 663 Asterisms!! in Constellation!Stars!!Objects nearby 02 Northern Fly!!Aries!!!41 Arietis !!!!!!!39 Arietis!!! !!!!!!!35 Arietis !!!!!!!!!!NGC 1056 02 Whale’s Head!!Cetus!! ! Menkar !!!!!!!Lambda Ceti! !!!!!!!Mu Ceti !!!!!!!Xi2 Ceti !!!!!!!Kaffalijidhma !!!!!!!!!!IC 302 !!!!!!!!!!NGC 990 !!!!!!!!!!NGC 1024 !!!!!!!!!!NGC 1026 !!!!!!!!!!NGC 1070 !!!!!!!!!!NGC 1085 !!!!!!!!!!NGC 1107 !!!!!!!!!!NGC 1137 !!!!!!!!!!NGC 1143 !!!!!!!!!!NGC 1144 !!!!!!!!!!NGC 1153 Asterisms!! in Constellation Stars!!Objects nearby 03 Hyades!!!Taurus! Aldebaran !!!!!! Theta 2 Tauri !!!!!! Gamma Tauri !!!!!! Delta 1 Tauri !!!!!! Epsilon Tauri !!!!!!!!!Struve’s Lost Nebula !!!!!!!!!Hind’s Variable Nebula !!!!!!!!!IC 374 03 Kids!!!Auriga! Almaaz !!!!!! Hoedus II !!!!!! Hoedus I !!!!!!!!!The Kite Cluster !!!!!!!!!IC 397 03 Pleiades!! ! Taurus! Pleione (Seven Sisters)!! ! ! Atlas !!!!!! Alcyone !!!!!! Merope !!!!!! Electra !!!!!! Celaeno !!!!!! Taygeta !!!!!! Asterope !!!!!! Maia !!!!!!!!!Maia Nebula !!!!!!!!!Merope Nebula !!!!!!!!!Merope
    [Show full text]
  • Visual/Infrared Interferometry of Orion Trapezium Stars: Preliminary Dynamical Orbit and Aperture Synthesis Imaging of the Θ1 Orionis C System
    A&A 466, 649–659 (2007) Astronomy DOI: 10.1051/0004-6361:20066965 & c ESO 2007 Astrophysics Visual/infrared interferometry of Orion Trapezium stars: preliminary dynamical orbit and aperture synthesis imaging of the θ1 Orionis C system S. Kraus1, Y. Y. Balega2, J.-P. Berger3, K.-H. Hofmann1, R. Millan-Gabet4, J. D. Monnier5, K. Ohnaka1, E. Pedretti5, Th. Preibisch1, D. Schertl1, F. P. Schloerb6, W. A. Traub7, and G. Weigelt1 1 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany e-mail: [email protected] 2 Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnij Arkhyz, Zelenchuk region, Karachai-Cherkesia 357147, Russia 3 Laboratoire d’Astrophysique de Grenoble, UMR 5571 Université Joseph Fourier/CNRS, BP 53, 38041 Grenoble Cedex 9, France 4 Michelson Science Center, California Institute of Technology, Pasadena, CA 91125, USA 5 Astronomy Department, University of Michigan, 500 Church Street, Ann Arbor, MI 48104, USA 6 Department of Astronomy, University of Massachusetts, LGRT-B 619E, 710 North Pleasant Street, Amherst, MA 01003, USA 7 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02183, USA Received 19 December 2006 / Accepted 7 February 2007 ABSTRACT Context. Located in the Orion Trapezium cluster, θ1Ori C is one of the youngest and nearest high-mass stars (O5-O7) known. Besides its unique properties as a magnetic rotator, the system is also known to be a close binary. Aims. By tracing its orbital motion, we aim to determine the orbit and dynamical mass of the system, yielding a characterization of the individual components and, ultimately, also new constraints for stellar evolution models in the high-mass regime.
    [Show full text]
  • Cosmic Raw Material Fig 20-CO, P.438
    Stars form in greatStars clouds form of gas in and great dust clouds of gas and dust Slide 1 Cosmic raw material Fig 20-CO, p.438 Chapter Opener The Eagle Nebula (M16) Stars form in great clouds of gas and dust, and this image shows a large region of such cosmic raw material. The gas is visible because, about 2 million years ago, the cloud produced a cluster of bright stars, whose light ionizes the hydrogen gas nearby, causing it to glow. The cluster can be seen just above and to the left of the darker columns of dust at the center of the image. The dark columns or “elephant trunks” of material are seen in much more detail in Figures 20.1 and 20.2. This false-color image was created by combining images taken through filters that select lines of hydrogen alpha (green), oxygen (blue), and sulfur (red). (T.A. Rector, B.A. Wolpa, and OAO/NRAO/AURA/NSF) 1 The Central Region of the Orion Nebula Slide 2 Fig 20-5a, p.443 Figure 20.5 The Central Region of the Orion Nebula The Orion Nebula harbors some of the youngest stars in the solar neighborhood. At the heart of the nebula is the Trapezium cluster, which includes four very bright stars that provide much of the energy that causes the nebula to glow so brightly. In these images, we see a section of the nebula in visible light (left) and infrared (right). The four bright stars in the center of the visible-light image are the Trapezium stars.
    [Show full text]
  • Tracing the Young Massive High-Eccentricity Binary System Θ1orionis C Through Periastron Passage
    A&A 497, 195–207 (2009) Astronomy DOI: 10.1051/0004-6361/200810368 & c ESO 2009 Astrophysics Tracing the young massive high-eccentricity binary system θ1Orionis C through periastron passage S. Kraus1,G.Weigelt1,Y.Y.Balega2, J. A. Docobo3, K.-H. Hofmann1, T. Preibisch4, D. Schertl1, V. S. Tamazian3, T. Driebe1, K. Ohnaka1,R.Petrov5,M.Schöller6, and M. Smith7 1 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany e-mail: [email protected] 2 Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnij Arkhyz, Zelenchuk region, Karachai-Cherkesia 357147, Russia 3 Astronomical Observatory R. M. Aller, University of Santiago de Compostela, Galicia, Spain 4 Universitäts-Sternwarte München, Scheinerstr. 1, 81679 München, Germany 5 Laboratoire Universitaire d’Astrophysique de Nice, UMR 6525 Université de Nice/CNRS, Parc Valrose, 06108 Nice Cedex 2, France 6 European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany 7 Centre for Astrophysics & Planetary Science, University of Kent, Canterbury CT2 7NH, UK Received 11 June 2008 / Accepted 27 January 2009 ABSTRACT Context. The nearby high-mass star binary system θ1Ori C is the brightest and most massive of the Trapezium OB stars at the core of the Orion Nebula Cluster, and it represents a perfect laboratory to determine the fundamental parameters of young hot stars and to constrain the distance of the Orion Trapezium Cluster. Aims. By tracing the orbital motion of the θ1Ori C components, we aim to refine the dynamical orbit of this important binary system. Methods. Between January 2007 and March 2008, we observed θ1Ori C with VLTI/AMBER near-infrared (H-andK-band) long- baseline interferometry, as well as with bispectrum speckle interferometry with the ESO 3.6 m and the BTA 6 m telescopes (B- and V-band).
    [Show full text]
  • Culpeper Astronomy Club Meeting November 25, 2019 Overview
    The Winter Constellations Culpeper Astronomy Club Meeting November 25, 2019 Overview • Introductions • Special Topics • Video: The Winter Constellations • Constellations: Orion, Canis Minor, Eridanus • Observing Session Special Topic #1: Mercury Transit (11 Nov) • Observing Session – 0730-1306 • Morning Calm Observatory • 5 Members participating • Trees obscured early viewing • Scattered Clouds throughout • Equipment: • Stellarvue SV110ED • Stellarvue SV102ED • Meade 12” LX200 • All full aperture filters • Observed most of the transit and the final egress • Bonus: Caught a couple of airliners crossing the Sun Venus Transit – 2012 Special Topic #2: VIPER to the Moon • NASA is sending a mobile robot to the south pole of the Moon: • Get a close-up view of the location and concentration of water ice in the region • Sample the water ice at the same pole where the first woman and next man will land in 2024 under the Artemis program • About the size of a golf cart, the Volatiles Investigating Polar Exploration Rover, or VIPER, will roam several miles • Four science instruments — including a 1- meter drill — to sample various soil environments. • Planned for delivery in December 2022, VIPER will collect about 100 days of data that will be used to inform development of the first global water resource maps of the Moon Special Topic #3: Going Back to Pluto? • As currently envisioned, the orbiter would cruise around the Pluto system, using gravity assists from the dwarf planet's largest moon, Charon, to slingshot it here and there • First, limited
    [Show full text]
  • What's up This Month – February 2021 These Pages Are Intended to Help You Find Your Way Around the Sky
    WHAT'S UP THIS MONTH – FEBRUARY 2021 THESE PAGES ARE INTENDED TO HELP YOU FIND YOUR WAY AROUND THE SKY The chart above shows the whole night sky as it appears on 15th February at 21:00 (9 o’clock) Greenwich Mean Time (GMT). As the Earth orbits the Sun and we look out into space each night the stars will appear to have moved across the sky by a small amount. Every month Earth moves one twelfth of its circuit around the Sun, this amounts to 30 degrees each month. There are about 30 days in each month so each night the stars appear to move about 1 degree. The sky will therefore appear the same as shown on the chart above at 8 o’clock GMT at the beginning of the month and at 10 o’clock GMT at the end of the month. The stars also appear to move 15º (360º divided by 24) each hour from east to west, due to the Earth rotating once every 24 hours. The centre of the chart will be the position in the sky directly overhead, called the Zenith. First we need to find some familiar objects so we can get our bearings. The Pole Star Polaris can be easily found by first finding the familiar shape of the Great Bear ‘Ursa Major’ that is also sometimes called the Plough or even the Big Dipper by the Americans. Ursa Major is visible throughout the year from Britain and is always quite easy to find. This month it is in the North 1 of 15 pages East.
    [Show full text]
  • Binarity in the Orion Trapezium Cluster
    The Formation of Binary Stars IA U Symposium, Vol. 200, 2001 H. Zinnecker and R. D. Mathieu, eds. Binarity in the Orion Trapezium Cluster Mark J. McCaughrean Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany Abstract. We summarise the results of recent optical and near-infrared imaging studies of the binary fraction among young low-mass stars in the dense Orion Trapezium Cluster. Over the separation range ('.J 30-500 AU and within the observational errors, there appears to be no excess of binary systems in the cluster relative to the main sequence field star population. Over the separation range ('.J 1000-5000 AU, the cluster is deficient in binaries relative to the field. Both results are in contrast to those found for the more distributed population of young stars in the Taurus-Auriga dark clouds, which is overabundant in binaries by roughly a factor of two. We briefly discuss possible origins for this difference and observational tests which may distinguish between them, and the implica- tions these results have for our understanding of the typical environment where most young stars are born. 1. Introduction The discovery of an overabundance of young low-mass binary systems in low- mass dark cloud star-forming regions, most notably Taurus-Auriga (see, e.g., Leinert et ale 1993; Ghez, Matthews, & Neugebauer 1993; Kohler & Leinert 1998; Duchene 1999; and many papers in these proceedings) relative to those found on the main sequence in the field (e.g., Duquennoy & Mayor 1991 [DM91] for field G-dwarfs) poses a thorny dilemma for our understanding of the star formation process.
    [Show full text]
  • The Southern Summer Download
    The Southern Summer 04.00 to 10.00 Hours Right Ascension The Southern Summer This is the time of year of Orion on the celestial equator with a pale ghost of the Milky Way traversing the northern sky. However, south of the celestial equator the warm nights of summer bring both Magellanic Clouds high into the sky. We also see the rich and starry regions in Carina, Puppis, Vela and Pyxis, the remains of the ancient Greek ship Argo Navis, dismantled in the southern Milky Way. This deep image, recorded with a small refractor, reveals the assortment of extraordinary star-forming regions that have emerged from the Orion Molecular Cloud complex. Iconic objects such as the Orion and Horsehead Nebulae are essentially thin blisters of glowing gases over the surface of vast molecular clouds, illuminated by massive stars. Book 40.indd 31 6/9/11 5:26 PM NGC 1531 and NGC 1532 his intriguing pair of interacting galaxies lies about 55 million light-years away in the direction of the T constellation of Eridanus (The River). The larger galaxy is NGC 1532, and it is a dusty spiral system rather like the Milky Way, seen almost edge-on. It appears to be interacting with a smaller companion, NGC 1531. This latter is a largely gasless spiral. The interaction is mostly indicated by the anomalous burst of star formation in the nearest spiral arm in NGC 1532 and some curiously displaced emission nebulae that appear to be close to NGC 1531, which seems to be in the background. Less obvious here are large plumes and recently formed clusters of blue stars in the outer arms of NGC 1532.
    [Show full text]
  • Orion's Largest
    A Digital Supplement to Astronomy Insights Astronomy Magazine © 2017 Kalmbach Publishing Co. Orion’s Secrets Revealed Find the Constellation’s Deep-Sky Treasures April 2017 • Astronomy.com NIGHT OF THE HUNTER Reflection nebula NGC 2023 surrounds a hot star and scatters its light from a distance of 1,600 light- Discover years. R. JAY GABANY ORION’S DEEP-SKY GEMS The beauty and variety of objects in this constellation will keep you warm even on the coldest nights. by Stephen James O’Meara rion the Hunter is one of the Hopefully, you’ll get enough clear nights around the Belt like a giant serpent around sky’s most identifiable starry that these treats will keep you busy on a stick. By the way, the third star in the figures. It’s also one of the cold winter nights. Belt, Alnilam (Epsilon [ε] Orionis), is wealthiest constellations in roughly three times as distant as the other terms of deep-sky riches. It Orion’s largest … two, according to measurements using Ocontains examples of every major class and then some Hipparcos satellite data. of object but one (a globular star cluster). Orion’s Belt is one of the easiest star pat- After making an observation of All are within reach of small- to medium- terns to find. These three 2nd-magnitude Collinder 70, you might find it easier to sized telescopes, and some are best seen stars, equally spaced across 3° of sky, out- imagine, as in Hindu mythology, the Sun through binoculars under a dark sky. line the Hunter’s waist.
    [Show full text]
  • Multiplicity of Massive Stars
    Multiplicity of massive stars Hans Zinnecker Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany, [email protected] Summary. We review the multiplicity of massive stars by compiling the abstracts of the most relevant papers in the field. We start by discussing the massive stars in the Orion Trapezium Cluster and in other Galactic young clusters and OB associa- tions, and end with the R136 cluster in the LMC. The multiplicity of field O-stars and runaway OB stars is also reviewed. The results of both visual and spectroscopic surveys are presented, as well as data for eclipsing systems. Among the latter, we find the most massive known binary system WR20a, with two ∼ 80 M components in a 3 day orbit. Some 80 % of the wide visual binaries in stellar associations are in fact hierarchical triple systems, where typically the more massive of the binary components is itself a spectroscopic or even eclipsing binary pair. The multiplicity (number of companions) of massive star primaries is significantly higher than for low-mass solar-type primaries or for young low-mass T Tauri stars. There is also a striking preponderance of very close nearly equal mass binary systems (the origin of which has recently been explained in an accretion scenario). Finally, we offer a new idea as to the origin of massive Trapezium systems, frequently found in the centers of dense young clusters. 1 The origin of the Orion Trapezium system Let us begin by discussing the origin of the massive stars in the center of the Orion Nebula Cluster, i.e.
    [Show full text]