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Mathématiques Et Espace
Atelier disciplinaire AD 5 Mathématiques et Espace Anne-Cécile DHERS, Education Nationale (mathématiques) Peggy THILLET, Education Nationale (mathématiques) Yann BARSAMIAN, Education Nationale (mathématiques) Olivier BONNETON, Sciences - U (mathématiques) Cahier d'activités Activité 1 : L'HORIZON TERRESTRE ET SPATIAL Activité 2 : DENOMBREMENT D'ETOILES DANS LE CIEL ET L'UNIVERS Activité 3 : D'HIPPARCOS A BENFORD Activité 4 : OBSERVATION STATISTIQUE DES CRATERES LUNAIRES Activité 5 : DIAMETRE DES CRATERES D'IMPACT Activité 6 : LOI DE TITIUS-BODE Activité 7 : MODELISER UNE CONSTELLATION EN 3D Crédits photo : NASA / CNES L'HORIZON TERRESTRE ET SPATIAL (3 ème / 2 nde ) __________________________________________________ OBJECTIF : Détermination de la ligne d'horizon à une altitude donnée. COMPETENCES : ● Utilisation du théorème de Pythagore ● Utilisation de Google Earth pour évaluer des distances à vol d'oiseau ● Recherche personnelle de données REALISATION : Il s'agit ici de mettre en application le théorème de Pythagore mais avec une vision terrestre dans un premier temps suite à un questionnement de l'élève puis dans un second temps de réutiliser la même démarche dans le cadre spatial de la visibilité d'un satellite. Fiche élève ____________________________________________________________________________ 1. Victor Hugo a écrit dans Les Châtiments : "Les horizons aux horizons succèdent […] : on avance toujours, on n’arrive jamais ". Face à la mer, vous voyez l'horizon à perte de vue. Mais "est-ce loin, l'horizon ?". D'après toi, jusqu'à quelle distance peux-tu voir si le temps est clair ? Réponse 1 : " Sans instrument, je peux voir jusqu'à .................. km " Réponse 2 : " Avec une paire de jumelles, je peux voir jusqu'à ............... km " 2. Nous allons maintenant calculer à l'aide du théorème de Pythagore la ligne d'horizon pour une hauteur H donnée. -
Science in the Urantia Papers
Science ¾ Scientific Validation of the UB z By Denver Pearson z By Phil Calabrese ¾ Seraphic Velocities ¾ Astronomy The Scientific Integrity of the Urantia Book by Denver Pearson As scientifically minded readers first peruse the Urantia Book, it soon occurs to them that many of its statements on the natural sciences conflict with currently held data and theories. In the minds of many this gives rise to doubts about the truthfulness of those statements. Wisdom would lead us to realize that nothing short of perfection is perfect, and anything touched by human hands has fingerprints. This should be our guiding thoughts as we contemplate the accuracy of the scientific content of the Urantia Papers. Several years ago, at the first scientific symposium, it was implied by one of the speakers that the revelation contains errors. This implication is alarming. More recently, at the second symposium held in Oklahoma, an interesting publication named "The Science Content of The Urantia Book" was made available (this document is obtainable from the Brotherhood of Man Library). In this publication is an article entitled "Time Bombs" in which the author suggests that the revelators planted certain inaccurate scientific statements in the book in order to prevent it from becoming a fetish. He states "...the revelators incorporated safeguards in the papers that would form The Urantia Book to diminish the tendency to regard it as an object of worship. What safeguards did they use? Suppose they decided to make sure that mortals reading it understood that some cosmological statements in the book would be found to be inaccurate". -
Virgo the Virgin
Virgo the Virgin Virgo is one of the constellations of the zodiac, the group tion Virgo itself. There is also the connection here with of 12 constellations that lies on the ecliptic plane defined “The Scales of Justice” and the sign Libra which lies next by the planets orbital orientation around the Sun. Virgo is to Virgo in the Zodiac. The study of astronomy had a one of the original 48 constellations charted by Ptolemy. practical “time keeping” aspect in the cultures of ancient It is the largest constellation of the Zodiac and the sec- history and as the stars of Virgo appeared before sunrise ond - largest constellation after Hydra. Virgo is bordered by late in the northern summer, many cultures linked this the constellations of Bootes, Coma Berenices, Leo, Crater, asterism with crops, harvest and fecundity. Corvus, Hydra, Libra and Serpens Caput. The constella- tion of Virgo is highly populated with galaxies and there Virgo is usually depicted with angel - like wings, with an are several galaxy clusters located within its boundaries, ear of wheat in her left hand, marked by the bright star each of which is home to hundreds or even thousands of Spica, which is Latin for “ear of grain”, and a tall blade of galaxies. The accepted abbreviation when enumerating grass, or a palm frond, in her right hand. Spica will be objects within the constellation is Vir, the genitive form is important for us in navigating Virgo in the modern night Virginis and meteor showers that appear to originate from sky. Spica was most likely the star that helped the Greek Virgo are called Virginids. -
The Brightest Stars Seite 1 Von 9
The Brightest Stars Seite 1 von 9 The Brightest Stars This is a list of the 300 brightest stars made using data from the Hipparcos catalogue. The stellar distances are only fairly accurate for stars well within 1000 light years. 1 2 3 4 5 6 7 8 9 10 11 12 13 No. Star Names Equatorial Galactic Spectral Vis Abs Prllx Err Dist Coordinates Coordinates Type Mag Mag ly RA Dec l° b° 1. Alpha Canis Majoris Sirius 06 45 -16.7 227.2 -8.9 A1V -1.44 1.45 379.21 1.58 9 2. Alpha Carinae Canopus 06 24 -52.7 261.2 -25.3 F0Ib -0.62 -5.53 10.43 0.53 310 3. Alpha Centauri Rigil Kentaurus 14 40 -60.8 315.8 -0.7 G2V+K1V -0.27 4.08 742.12 1.40 4 4. Alpha Boötis Arcturus 14 16 +19.2 15.2 +69.0 K2III -0.05 -0.31 88.85 0.74 37 5. Alpha Lyrae Vega 18 37 +38.8 67.5 +19.2 A0V 0.03 0.58 128.93 0.55 25 6. Alpha Aurigae Capella 05 17 +46.0 162.6 +4.6 G5III+G0III 0.08 -0.48 77.29 0.89 42 7. Beta Orionis Rigel 05 15 -8.2 209.3 -25.1 B8Ia 0.18 -6.69 4.22 0.81 770 8. Alpha Canis Minoris Procyon 07 39 +5.2 213.7 +13.0 F5IV-V 0.40 2.68 285.93 0.88 11 9. Alpha Eridani Achernar 01 38 -57.2 290.7 -58.8 B3V 0.45 -2.77 22.68 0.57 144 10. -
THE CONSTELLATION HYDRA, WATER SNAKE Hydra Is the Largest of the 88 Modern Constellations, Measuring 1303 Square Degrees
THE CONSTELLATION HYDRA, WATER SNAKE Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees. Also one of the longest at over 100 degrees, its southern end abuts Libra and Centaurus and its northern end borders Cancer. It has a long history, having been included among the 48 constellations listed by the 2nd century astronomer Ptolemy. It is commonly represented as a water snake. It should not be confused with the similarly named constellation of Hydrus. The neighboring constellations are Antlia, Cancer, Canis Minor, Centaurus, Corvus, Crater, Leo, Libra, Lupus, Monoceros, Puppis, Pyxis, Sextans and Virgo. Despite its size, Hydra contains only one reasonably bright star, Alphard, designated Alpha Hydrae. It is an orange giant of magnitude 2.0, 177 light-years from Earth. Its traditional name means "the solitary one". Beta Hydrae is a blue-white star of magnitude 4.3, 365 light-years from Earth. Gamma Hydrae is a yellow giant of magnitude 3.0, 132 light-years from Earth. Hydra has one bright binary star, Epsilon Hydrae, which is difficult to split in amateur telescopes; it has a period of 1000 years and is 135 light-years from Earth. The other main named star in Hydra is Sigma Hydrae, which has the name of Minaruja, from the Arabic for snake's nose. At magnitude 4.54, it is rather dim. The head of the snake corresponds to the Ashlesha nakshatra, a lunar zodiacal constellation in Indian astronomy. Hydra is also home to several variable stars. R Hydrae is a Mira variable star 2000 light-years from Earth; it is one of the brightest Mira variables at its maximum of magnitude 3.5. -
Terry Adrian's Finest NGC Chart/Log System
RASC FINEST NGC No. NGC Con Type R.A. Dec m_v Size Remarks Seen Date Autumn 1 7009 Aqr PN 21:04.2 -11:02 8.3 25" !! Saturn Nebula; small bright oval 2 7293 Aqr PN 22:29.6 -20:48 6.5 12'50" !! Helix Nebula; large, diffuse; use filter 3 7331 Peg G-Sb 22:37.1 +34:25 9.5 10.7x4.0 !! large, bright spiral galaxy 4 7635 Cas EN 23:20.7 +61:12 - 15x8 Bubble Neb.; very faint; 1/2 deg SW of M52 5 7789 Cas OC 23:57.0 +56:44 6.7 16 !! 300*; faint but very rich cluster 6 185 Cas G-E0 00:39.0 +48:20 11.7 2x2 companion to M31; paired with NGC 147 7 281 Cas EN 00:52.8 +56:36 - 35x30 !! large faint nebulosity near eta Cas 8 457 Cas OC 01:19.1 +58:20 6.4 13 80*; rich; one of the best Cas clusters 9 663 Cas OC 01:46.0 +61:15 7.1 16 80*; look for NGC's 654 and 659 nearby 10 I 289 Cas PN 03:10.3 +61:19 12.3 34" dim oval smudge; use nebula filter 11 7662 And PN 23:25.9 +42:33 9.2 20" !! Blue Snowball; annular at high power 12 891 And G-Sb 02:22.6 +42:21 10 13.5x2.8 !! faint, classic edge-on with dust lane 13 253 Scl G-Scp 00:47.6 -25:17 7.1 25.1x7.4 !! very large and bright but at low altitude 14 772 Ari G-Sb 01:59.3 +19:01 10.3 7.1x4.5 diffuse spiral galaxy 15 246 Cet PN 00:47.0 -11:53 8.0 3'45" faint (closer to 11 m); dark mottling 16 936 Cet G-SBa 02:27.6 -01:09 10.1 5.2x4.4 near M77; NGC 941 in the same field 17 869/84 Per OC 02:20.0 +57:08 ~4.4 30/30 !! Double Cluster; 350*; use low mag. -
ACA News Apr 04.Pub
The Night Sky Astronomy Club of Akron Astronomy Club of Akron Akron, OH USA http://www.acaoh.org The Night Sky APRIL 2004 Presidential Musings Physics at Kent State University, Membership Renewal Stark Branch. Many ACA mem- By Gregg Crenshaw bers may remember Bernie as he Now is the time to renew your has spoken at meetings in the membership in the Astronomy On Sunday, March 28 a group of past. His talk will be entitled Club of Akron. ACA members visited the Cleve- “Relativity, Is it Really Relative? land Museum of Natural History. Membership includes: Clyde Simpson, Coordinator of Come to the business meeting the Ralph Mueller Observatory and vote for the person of your • A one year subscription to at the museum took the group on choice for ACA officers for the the club's monthly newsletter a “behind the scenes” tour to year. • Discounts on subscriptions places many of us didn’t know for Sky & Telescope or As- existed. The group started out, tronomy magazines naturally, in the observatory. NEXT MEETING • Use of loaner telescopes Clyde pointed the 10.5” refractor • Access to the Portage Lakes at Venus. Everyone enjoyed Ve- State Park Observatory nus’s crescent shape on a rare • An open invitation to all club partly cloudy day. We also activities. looked at a good size sunspot April 23 group as Clyde projected the so- 8:00 PM Dues are $20.00 a year for lar image on a large white card. Adults (18 and over), $15.00 for We then visited many laborato- Kiwanis Hall. -
San Jose Astronomical Association Membership Form
The Messier Marathon at Henry Coe State Park Vivek Mohan It began, like almost all activities, and no amount of tweaking, prodding, However, locating objects without with a groan. “Come on, it’s a Saturday or adjusting it could fix the problem. a viewfinder was proving to be a difficult night, do we have to go to the Messier Using the other scope, we quickly exercise. M81 was the next object on Marathon?” “Let’s watch a movie located the easiest of the Messier the list, and it was more difficult to instead.” It ended, also, with a groan, objects — M42 and M43, otherwise locate than it should have been. We but on a different note — “Are we known as Orion’s Nebula and de decided to take a walk around and look leaving already?” “Can’t we stay a little Mairan’s Nebula (located slightly below at the other telescopes there. Some of longer?” All in all, the Messier Marathon Orion’s belt.) Another easy-to-locate the very large scopes, a 20” scope and at Henry Coe State Park was a fun object, M36, in Auriga, was next. The 18” scope, were next to us. We kept experience. other two Messier objects in Auriga, admiring the scopes themselves, which We loaded our 6” dob (on loan M37 and M38, were easy to find from from SJAA) and drove over to our there. Continued on next page friend’s house. Mr. Kumar brought his 6” equatorial and his 10 year old son, SJAA activities calendar Jim Van Nuland “When it was time to leave, my younger brother and I May June asked for the traditional 3 Deep sky weekend. -
Comet V2 Johnson Takes Center Stage 19 May 2017, by David Dickinson
Comet V2 Johnson takes center stage 19 May 2017, by David Dickinson top out at magnitude +6 in late June, post- perihelion. Part of what's making Comet V2 Johnson favorable is its orbit. With a high inclination of 50 degrees relative to the ecliptic, it's headed down through high northern declinations for a perihelion just outside of Mars' orbit on June 12th. Though Mars is on the opposite side of the sun this summer, we're luckily on the correct side of the sun to enjoy the cometary view. Comet V2 Johnson passed opposition a few weeks ago on April 28th, and will become an exclusively southern hemisphere object in late July as it continues the plunge southward. Comet V2 Johnson from February 21st, 2017. Credit: John Purvis Had your fill of binocular comets? Turns out, 2017 may have saved the best for last. The past few months has seen a steady stream of dirty snowball visitations to the inner solar system, both short term periodic and long term hyperbolic. First, let's run through the cometary roll call for the first part of the year: There's 41P Tuttle-Giacobini-Kresák, 2P/Encke, 45P Honda-Markov-Padjudašáková, C/2015 ER61 PanSTARRS and finally, the latecomer to the party, C/2017 E4 Lovejoy. Next up is a comet with a much easier to pronounce (and type) name, at least to the English- The path of Comet C/2015 V2 Johnson through the inner speaking tongue: C/2015 V2 Johnson. solar system. Credit: NASA/JPL It would seem that we're getting a year's worth of binocular comets right up front in the very first half. -
Meteor Activity Outlook for February 15-21, 2020
Meteor Activity Outlook for February 15-21, 2020 Daniel Bush captured this impressive fireball on 18 November 2020 at 04:41 universal time from Albany, Missouri USA.©Daniel Bush During this period the moon reaches its last quarter phase on Saturday February 15th. At this time the moon will lie 90 degrees west of the sun and will rise near 01:00 local standard time (LST). These conditions are fine for the slow evening hours when the moon lies below the horizon. The more active morning hours will have interference from the moon but one can still obtain useful data as long you face away from the lunar glare. As the week progresses the waning crescent moon will rise later in the morning, allowing less interference during these more active hours. The estimated total hourly meteor rates for evening observers this week is near 2 no matter your location. For morning observers, the estimated total hourly rates should be near 5 as seen from mid-northern latitudes (45N) and 10 as seen from tropical southern locations (25S). The actual rates will also depend on factors such as personal light and motion perception, local weather conditions, alertness and experience in watching meteor activity. Morning rates are reduced during this period due to moonlight. Note that the hourly rates listed below are estimates as viewed from dark sky sites away from urban light sources. Observers viewing from urban areas will see less activity as only the brighter meteors will be visible from such locations. The radiant (the area of the sky where meteors appear to shoot from) positions and rate s listed below are exact for Saturday night/Sunday morning February 15/16. -
Monthly Observer's Challenge
MONTHLY OBSERVER’S CHALLENGE Las Vegas Astronomical Society Compiled by: Roger Ivester, Boiling Springs, North Carolina & Fred Rayworth, Las Vegas, Nevada With special assistance from: Rob Lambert, Las Vegas, Nevada JUNE 2016 Introduction The purpose of the Observer’s Challenge is to encourage the pursuit of visual observing. It’s open to everyone that’s interested, and if you’re able to contribute notes, and/or drawings, we’ll be happy to include them in our monthly summary. We also accept digital imaging. Visual astronomy depends on what’s seen through the eyepiece. Not only does it satisfy an innate curiosity, but it allows the visual observer to discover the beauty and the wonderment of the night sky. Before photography, all observations depended on what the astronomer saw in the eyepiece, and how they recorded their observations. This was done through notes and drawings, and that’s the tradition we’re stressing in the Observers Challenge. We’re not excluding those with an interest in astrophotography, either. Your images and notes are just as welcome. The hope is that you’ll read through these reports and become inspired to take more time at the eyepiece, study each object, and look for those subtle details that you might never have noticed before. M5 (NGC-5904) Globular Cluster In Serpens Caput M5, also known as NGC-5904 is a globular cluster in Serpens Caput. It was discovered by Gottfried Kirch in 1702 and Charles Messier added it to his catalog in 1764. William Herschel was the first to resolve stars in it in 1791 where he counted around 200 or so. -
June-2021-Observers-Challenge- Ngc
MONTHLY OBSERVER'S CHALLENGE Compiled by: Roger Ivester, North Carolina & Sue French, New York June 2021 Report #149 NGC 5746, Edge-on Spiral Galaxy in Virgo Sharing Observations and Bringing Amateur Astronomers Together Introduction The purpose of the Observer's Challenge is to encourage the pursuit of visual observing. It's open to everyone who's interested, and if you're able to contribute notes and/or drawings, we’ll be happy to include them in our monthly summary. Visual astronomy depends on what's seen through the eyepiece. Not only does it satisfy an innate curiosity, but it allows the visual observer to discover the beauty and the wonderment of the night sky. Before photography, all observations depended on what astronomers saw in the eyepiece, and how they recorded their observations. This was done through notes and drawings, and that's the tradition we're stressing in the Observer's Challenge. And for folks with an interest in astrophotography, your digital images and notes are just as welcome. The hope is that you'll read through these reports and become inspired to take more time at the eyepiece, study each object, and look for those subtle details that you might never have noticed before. This month's target William Herschel discovered NGC 5746 on 24 February 1786 with his 18.7-inch reflector. His handwritten journal reads:" Extremely bright, much extended in the parallel, 8 or 9 arcminutes long, bright nucleus." A recent study by John Kormendy and Ralf Bender in the Astrophysical Journal presents NGC 5746 as a structural analog of our own galaxy.