Deepsky farebne

[Pavuk_]

Aj ked som usilovne hladal v archive tuto temu (pamatam si ze sa o tom diskutovalo) nepodarilo sa mi ju najst, tak zakladam novu.

Nasiel som odkaz, kde sa pise ze je mozne vidiet Trifid M20 ako cerveno-modru uz od 20cm priemeru.

The Trifid Nebula is small and does have relatively high surface brightness, therefore the use of filters is not compulsory; to the contrary, the diffuse reflection nebula which forms the northern part of M20 will simply disappear if you use any nebula filter. But, when the sky brightness there is high, an UHC helps to improve the visibility of the emission part of M20. The reflection part is easier to observe at low magnification. If you use a telescope with at least 8" of aperture, you should be able to see colors in the nebula, the emission nebula appears pink and the reflection nebula slightly blue, just as on photographs. Whether these colors are apparent or not depends not only on telescope size but also on conditions and on the color perception of the observer. Some observers report green and not pink color in the emission part, their eyes respond better to the green OIII line emission. Do not use too much magnification if you want to see the colors of the nebula, as your eye will need maximum light input.

http://www.astro.univie.ac.at/~exgalak/ ... 0_APO.html

[Myzer]

Neviem ci sa tu uz o tom diskutovalo, ale nedavno sa o tom bavili na CloudyNights, daval som sem aj odkaz.