HINWEIS: Es handelt sich bei diesem Artikel um Gebrauchtware bzw. Rückläufer. Das bedeutet: Der Artikel kann leichte Gebrauchsspuren aufweisen; Teile des Zubehörs können fehlen; die Verpackung kann von der Originalverpackung abweichen. Bitte beachten Sie, dass für Refurbished Artikel generell 12 Monate Garantie gelten Das BRESSER JUNIOR Astroplanetarium holt dir die Sterne vom Himmel und zwar direkt an deine Zimmerdecke. Dabei gibt es eine Menge zu erforschen: 8.000 Sterne und 61 Sternbilder mit Namen zaubert dir das Heimplanetarium mit 2 Projektionsscheiben und einer hellen LED in deine vier Wände. Wolltest du schon immer mal genauer erforschen, welche Sternbilder an deinem Geburtstag am Himmel erscheinen? Dann lass sie dir zeigen! Stelle einfach das Datum und eine Uhrzeit zwischen 20 und 2 Uhr nachts ein. Denn egal ob Sommer oder Winter, in dieser Zeit siehst du immer Sterne am Himmel. Dann das Planetarium für Kinder nur noch anschalten und schon leuchtet dein Geburtstags-Nachthimmel über dir. Wenn du dabei den optimalen Abstand von 2 Metern zur Decke einhältst, bedeckt die Projektion eine große Gesamtfläche von ca. 1,6 x 2,1 m. Mit dem Fokussierrad sorgst du dabei für ein scharfes Himmelsbild. Weihnachten, Ostern oder Muttertag natürlich kannst du so auch die Sterne an jedem anderen Tag im Jahr erkunden!
Mit dem Heimplanetarium den Nachthimmel jederzeit im Blick
Vielleicht hast du auch schon erste Erfahrungen mit dem wichtigsten Instrument aller Sternenforscher gemacht: dem Teleskop. Dann weißt du: Zum Sternebeobachten brauchst du gutes Wetter. Denn schieben sich Wolken vor die Himmelskörper, dann siehst du sie nicht. Mit dem Planetarium für zu Hause kannst du dich auch bei Regen, Nebel oder Schnee mit deinem Astronomie-Hobby beschäftigen. Durch den eingebauten Motor lässt sich das Bild sogar automatisch drehen: Geht es gegen den Uhrzeigersinn, entspricht die Bewegung dem natürlichen Bewegungsablauf der nördlichen Erdhalbkugel. Lässt du das Bild rechtsseitig drehen, entspricht die Rotation der südlichen Halbkugel. Ganz anders als bei der Erde kannst du bei deinem Astroplanetarium sogar zwischen 6 Geschwindigkeitsstufen wählen. Und wenn du möchtest, ziehen im Sternschnuppen-Modus Kometenschweife durch das Bild. Wünsch dir was!
Durch den Sternenhimmel ins Land der Träume
Was gibt es schöneres, als nach einem Tag voller Entdeckungen unter den Sternen einzuschlafen ganz wie die großen Abenteurer! Dafür aktivierst du mit einem Knopfdruck den Schlafmodus. So geht dein Heimplanetarium entweder nach 30 oder 60 Minuten von alleine aus. Du willst den himmlischen Anblick länger genießen? Kein Problem: Lass das Gerät ganz normal laufen und es schaltet sich erst nach 2 Stunden selbst ab, um Strom zu sparen. Dann träumst du schon längst von neuen Reisen zu den Sternen.
Werde zum Sternwanderer in deinen eigenen vier Wänden mit dem BRESSER JUNIOR Astroplanetarium!
Du kannst von Sonne, Mond, Sternen und Co. gar nicht genug bekommen? Unser Tipp: das zusätzlich erhältliche Buch ''Julius forscht im Weltall Forschen, Entdecken, Basteln''. Freu dich auf jede Menge Infos, viele spannende Experimente und kreative Bastelideen rund um den Weltraum.
EIGENSCHAFTEN
Heimplanetarium für Kinder ab 14 Jahren
Sternschnuppen-Funktion
Abschaltautomatik (nach 30, 60 oder 120 Minuten)
Projektionsfläche 1,6 x 2,1 m (bei 2 m Distanz)
1 helle, weiße LED
Bewegtes Projektionsbild durch 2 Motoren, 6 unterschiedliche Geschwindigkeiten
Fokussierrad für scharfe Bilder
Simulation des Nachthimmels an Wand oder Decke mit Anpassung an Tag und Uhrzeit
Mehr als 8.000 Himmelsobjekte und 61 Sternbilder auf zwei Projektionsscheiben
Projektionsabstand: maximal 3 m
LIEFERUMFANG
Astroplanetarium
2x Projektionsscheiben
3x AA-Batterien
Bedienungsanleitung
Ultra Light Dobsonian 500mm GENERATION II - telescope mechanics handcrafted in HUNGARY and GERMANY
No telescope type has influenced amateur astronomy as radically as the dobsonian telescope. Before the introduction of this telescope type by John Dobson the vast majority of amateur telescopes were small inadequate refractors on shaky mounts - just good enough to show the polar regions on mars or the rings of Saturn. Bigger telescopes, like the Schmidt-Cassegrain telescopes, were restricted to the relatively small group of amateurs that could afford them.The brilliant combination of simple - but effective - mechanics and the largest aperture available led to a worldwide triumph of this concept. No other telescope type offers you so much light for your money as a good dobson. We have taken the motto held together by gravity and driven by yoghurt power and offer a modern version of the classic - designed by amateur astronomers for amateur astronomers. Despite its large aperture the telescope can be transported easily even in small cars and is assembled within minutes without tools. The construction was optimized for maximum rigidity with a minimum of mass. The combination of big altitude wheels and a optimized aluminium-sandwich construction allows for small movements even at high magnifications. The focus position is already positioned to accept our coma-corrector (part No. 0510330) . The ideal workhorse for the deep-sky enthusiast. A telescope with 500mm aperture gathers more than 5100-times more light than the naked eye. Details on planetary surfaces stand out even to unexperienced observers, and countless deep-sky objects show details and some color. Bright globular clusters are resolved down to the core and the view of the lunar terminator will provide a unforgettable experience.
The fast 20’’ f3.6 main mirror as well as the large 120mm secondary mirror are made of high quality quartz material, so the cooling time is reduced to a minimum and the Dobson is quickly ready for use. Every main mirror is delivered with an individual optical test certificate, which guarantees the highest capacity. A laser engraved center mark of the main mirror allows easy adjustment. The optical surface has a high-quality aluminum silvering with 94% reflectivity and an extremely resistant quartz protection layer. The mirror overcomes frequently occurring dew fogging and cleanups without any damages and guarantees a long service life.
A complete redesign of this Dobson was necessary to ensure the significantly increased requirements to stiffness and load bearing capacity of the optical components. All connections of the tube structure were made in the TIG welding process and no rivets and screws were used. This has made it possible for us to produce this 20’’ light weight Dobson so unbelievably stiff in spite of the low weight - a noticeably good quality which is searching for its match. The production of almost all mechanical components is carried out by our partners in Hungary and the final assembly of the optics and subsequent quality control takes place in Rhede, Germany.
The equipment details of the smaller Dobson models, which have been popular for years, have been taken over and even extended considerably. First of all, of course, the very good decomposability and transportability should be mentioned. Set-up and dismantling can be carried out without tools. The main and secondary mirrors are adjustable during the observation and only two adjusting screws have to be moved. Thanks to the use of precision ball-heads in the main mirror cell and a precision hinge for secondary mirror suppport, the adjustment is absolutely easy and guarantees excellent stability. All connecting parts of the tube trusses now consist of CNC machined aluminum and are attached by stainless steel dowel screws. The secondary mirror can now also be adjusted by the adjusting screws in the direction of the optical axis. The tried and tested 2.5’’ HEXAFOC focuser with 1:10 fine adjustment has been used for years - this allows vignetting-free observation despite the fast aperture ratio. A second 40° displaced installed mounting plate with a viewfinder shoe allows the rotation of the tube top in combination with a favorable position of the viewfinder tube or the mounting of an additional TELRAD viewfinder. The 6 supporting feet underneath the rockerbox offer a perfect stability and guarantee a smooth tracking in azimuth. Four smaller fans are installed in the side of the mirror box as well as a large fan is installed under the main mirror. This allows an even quicker adaptation to the ambient temperature and reduces the tube seeing (boundary layer removal). The lateral altitude wheels can now be stowed comfortably in the foam layers of the mirror box.
Last but not least another gimmick: The optical tube and the mirror cell are designed to use also on heavy equatorial mounts.
Dimensions for mobile use:
DIMS total: 680x680x1790mm; Rockerbox 678mmx678mmx347mm; Mirrorbox 590mmx590mmx361mm; Trusses approx. 1084mm; Truss diameter: 25mm; Eyepiece height while pointing at zenith approximately 1,63m; 20’’ Total net weight: 53 kg; 20’’ Mirror Box + Altitude wheels: 35,8kg; 20’’ Secondary Cage: 3,8kg; Rockerbox: 10,6 kg; 20’’ 4 Truss pairs: 2,8kg; 20’’ Primary mirror: 20kg
SPECIFICATIONS
Truss-Dobsonian telescope in full Aluminium construction
Handcrafted in HUNGARY and GERMANY
Fast 20’’ f3.6 optics with 1800mm focal length
Large 120mm secondary mirror (short axis)
Quarz primary- and secondary mirror set
Laser engraved central mark on primary mirror
Eyepiece height while pointing at zenith approximately 1,63m
Full welded rigid telescope structure - no rivets and no screws
Telescope tube and rockerbox powder-coated
Collimation while observing with the delivered tooling
DeLuxe 2,5’’ HEXAFOC focuser with 1:10 gear-reduction
8x50 finder scope with red illuminated reticle
Slider bearings made from TEFLON und GRP for smooth and precise movement
Improved primary mirror cell with completely redesigned mechanics
High precision hinge system for secondary mirror holder
Secondary mirror holder with adjustment mechnism along the optical axis
6 larger feet to improve stability
Counter-weights (4 x 1.0 kg) included
2 universal finder slots to enable an easy finder position
Quick-lock fasteners with new springloaded design for comfortable use
Large powder-coated yellow altitude wheels for smooth tracking
Altitude wheels can be stored in the mirror box
5 cooling fans are speeding up the cool-down time
SCOPE OF DELIVERY
Truss Dobsonian Telescope
Individual optical test report for primary mirror
8x50 finder with red illuminated reticle
Stray light shield for secondary cage
Primary mirror collimation tool
Battery compartment with bag for fans
Extension tube for focuser
Reducer 2’’/1.25’’
Manual
SHIPPING DIMENSION - truck shipment only in order to guarantee a save transport:
BOX1: 600x600x380 approx. 44 kg ; BOX2: 690x690x330 approx. 17 kg ; BOX3: 150x150x1150 approx. 4 kg
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