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12 Vulpeculae

12 Vulpeculae is a class B2.5V (blue main-sequence) star in the constellation Vulpecula. It is a variable Be star with an apparent magnitude varying from 4.78 to 4.97 and it is approximately 630 light years away based on parallax.

Vulpecula - Wikipedia
Stars. There are no stars brighter than 4th magnitude in this constellation. The brightest star in Vulpecula is Alpha Vulpeculae, a magnitude 4.44 m red giant at a distance of 297 light-years.
en.wikipedia.org
Volpetta (costellazione) - Wikipedia
Stelle variabili. Nella costellazione sono note poche stelle variabili, di cui molte sono fuori dalla portata di piccoli strumenti.La più luminosa e anche la più semplice da osservare come entità di variazione è la T Vulpeculae, che in quasi 4,5 giorni varia fra la quinta e la sesta magnitudine.
it.wikipedia.org
Nova - Wikipedia
A nova (plural novae or novas) or classical nova (CN or plural CNe) is a transient astronomical event that causes the sudden appearance of a bright, apparently "new" star, that slowly fades over several weeks or many months.
en.wikipedia.org
The Constellations 2 - Ian Ridpath
Visibility range (partial) gives the latitudes from which the constellation only ever rises partly above the horizon. Constellations which never rise more than a few degrees above the horizon from a given latitude will be effectively unobservable.
www.ianridpath.com
Nova - Wikipedia, la enciclopedia libre
Una nova es una explosión termonuclear causada por un desequilibrio entre la gravedad de una estrella y su combustible nuclear, hidrógeno; cuando la estrella agota su combustible nuclear esta se expande y a continuación explota.
es.wikipedia.org
Hunting White Dwarfs, the Night's Stellar Peewees - Sky ...
After standing in the presence of giants, we "kneel down" to get a closer look at the smallest stars visible in the night sky, the white dwarfs.
www.skyandtelescope.com
全天88星座 一覧 - 星座図鑑 ENCYCLOPEDIA OF ...
全天には88の星座がありますが、とびうお座やけんびきょう座など、日本からは見えないものもあります。下の一覧には89星座ありますが、これはへび座を2つに分けているためです。
seiza-zukan.com
See Summer's Best Naked-Eye Double Stars - Sky & Telescope
Not every set of closely paired stars requires binoculars or a telescope to "split". Here's a guide to summertime doubles you can view with your eyes alone.
www.skyandtelescope.com
Stjernebillede - Wikipedia, den frie encyklopædi
Stjernebillede kaldes hvert af de områder som nattehimlen er opdelt i. Stjernebilleder er et praktisk hjælpemiddel for astronomer når de ønsker at fortælle omtrent hvor på himmelen en observation er gjort.
da.wikipedia.org
Lijst van sterren - Wikipedia
Dit is een lijst van sterren die naast een aanduiding of catalogusnummer ook een traditionele naam hebben.
nl.wikipedia.org