Sh2-240 - Spagetti-köd
A Szekeres csillagkĂ©pben elhelyezkedĆ ködössĂ©g egy szupernĂłva-maradvĂĄny, mely egy 40 ezer Ă©vvel ezelĆtt felrobbant csillagbĂłl keletkezett.
A robbanĂĄs Ăłta folyamatosan tĂĄgul a ködössĂĄg Ă©s mostansĂĄg mĂĄr 150 fĂ©nyĂ©v ĂĄtmĂ©rĆjƱ, mely azt jelenti, hogy hĂĄrom telihold szĂ©lessĂ©gƱ objektumrĂłl van szĂł ami egyben halvĂĄny is.
HalvĂĄny emissziĂłs ködössĂ©gek keskenysĂĄvĂș szƱrĆkkel fotĂłzva igen lĂĄtvĂĄnyos formavilĂĄgot mutatnak meg Ă©s a most publikĂĄlt fotĂł csupĂĄn a jĂ©ghegy csĂșcsa. Sok szĂĄzezernyi ilyen objektum lĂĄtszĂłdik a vilĂĄgƱrben.
A Spagetti-köd fotĂłzĂĄsa összesen 60 ĂłrĂĄn keresztĂŒl zajlott kĂ©tfĂ©le keskenysĂĄvĂș szƱrĆvel. A vörösökĂ©rt a hidrogĂ©n-alfa szƱrĆ, mĂg a kĂ©kesszöld szĂnĂ©rt az ionizĂĄlt oxigĂ©n fĂ©nyĂ©t ĂĄteresztĆ fotografikus szƱrĆ a felelĆs, utĂłbbinak a kĂ©kes szĂne fel lett erĆsĂtve. A csillagok azonban "normĂĄl" RGB szƱrĆvel kĂ©szĂŒltek.
60 ĂłrĂĄs Ă©jszaka nincsen, de az összidĆ sok 10 perces felvĂ©tel ĂĄtlagĂĄbĂłl ĂĄll össze. Egy 200mm ĂĄtmĂ©rĆjƱ, 750mm fĂłkusszal rendelkezĆ tĂĄvcsĆ egy SWEQ6-os mechanikĂĄn minden derĂŒlt este vissza kellett, hogy tĂ©rjen a cĂ©lterĂŒletre egy ZWO ASI 294MM kamerĂĄval.
A kamera monokrĂłm, Ăgy az elĂ© befordulĂł szƱrĆk kombinĂĄciĂłjĂĄval lehet elĆĂĄllĂtani szĂnes fotĂłt. ElsĆre bonyolultnak tƱnik, de valĂłjĂĄban egy elĂ©g hatĂ©kony rendszer az asztrofotĂłzĂĄshoz.
Sh2-240 - Spaghetti nebula
The nebula located in the Auriga constellation is a supernova remnant that was formed from a star that exploded 40,000 years ago.
The nebula has been expanding continuously since the explosion and is now 150 light-years in diameter, which means that it is an object the width of three full moons.
Faint emission nebulae photographed with narrow-band filters show a very spectacular form and the photo just published is only the tip of the iceberg. Many hundreds of thousands of such objects are visible in outer space.
The Spaghetti Nebula was photographed for a total of 60 hours with two types of narrowband filters. The hydrogen-alpha filter is responsible for the reds, while the photographic filter that transmits the light of ionized oxygen is responsible for the bluish-green color, the bluish color of the latter has been amplified. However, the stars were made with a "normal" RGB filter.
There is no 60-hour night, but the total time is an average of many 10-minute recordings. A 200mm diameter telescope with a 750mm focus on a SWEQ6 mount had to return to the target area every clear night with a ZWO ASI 294MM camera.
The camera is monochrome, so a color photo can be produced by a combination of filters placed in front of it. It looks complicated at first, but it's actually quite an effective system for astrophotography.