h alpha


Look at Alpha accidentally bumping into Omega and then Omega squeezing/patting Alpha’s shoulder at the end :’) so! cute!

The W in Cassiopeia : A familiar, zigzag, W pattern in northern constellation Cassiopeia is traced by five bright stars in this colorful and broad mosaic. Stretching about 15 degrees across rich starfields, the celestial scene includes dark clouds, bright nebulae, and star clusters along the Milky Way. In yellow-orange hues Cassiopeias alpha star Shedar is a standout though. The yellowish giant star is cooler than the Sun, over 40 times the solar diameter, and so luminous it shines brightly in Earths night from 230 light-years away. A massive, rapidly rotating star at the center of the W, bright Gamma Cas is about 550 light-years distant. Bluish Gamma Cas is much hotter than the Sun. Its intense, invisible ultraviolet radiation ionizes hydrogen atoms in nearby interstellar clouds to produce visible red H-alpha emission as the atoms recombine with electrons. Of course, night skygazers in the Alpha Centauri star system would also see the recognizable outline traced by Cassiopeias bright stars. But from their perspective a mere 4.3 light-years away they would see our Sun as a sixth bright star in Cassiopeia, extending the zigzag pattern just beyond the left edge of this frame. via NASA


SOUL NEBULA IC 1848 by shaun
Via Flickr:
Part of the Soul Nevbula in Cassiopia. A Narrow Band image with H alpha, O3 and Synthetic Green , 10 hours total exposure of 20x900 sec Ha and 20 x 900 sec O3 NEQ6 MOUNT FLT98 APO SXVH 694 MONO COOLED CCD (-10degrees)


Messier 31 - Andromeda Galaxy by Rüdiger
Via Flickr:
3x2 Mosaic shot with ATIK ONE 9.0 and APM LZOS 130/780 with Riccardi Reducer at f4,5/585mm. Baader RGB + IDAS LPS-D1 Lum: 2 hours each panel (3min subs) R/G/B: 40 min each (5min subs) => 24h total H-Alpha is available, but very weak (only 50min for each panel)


IC1340 by Bert Mettier
Via Flickr:
H-ALPHA, O-III, = 3X20’ Each L=9x10’, RGB=6X10'EACH MEADE16’’, F/7.5, PARAMOUNT ME, SBIG STXL-11000 Unterwasser, Switzerland N47°12'28 E9°18'58


Ic1396 by telemaq76
Via Flickr:
31x4 minutes avec filtre cls-ccd pour la couleur 18x4 minutes avec filtre h-alpha 6nm pour la luminance 25 darks, 1000 offsets, 15 flats avec un canon 700d astrodon, le canon 500 f4Is sur monture Skywatcher neq6pro


SHARPLESS2-188 NARROW BAND by Bert Mettier
Via Flickr:
H-Alpha, OIII, SII=3x20 Each MEADE16’’, F/7.5, PARAMOUNT ME, SBIG STXL-11000 Unterwasser, Switzerland N47°12'28 E9°18'58


Scorn - Reveal Trailer + Pre-Alpha Gameplay (H.R. Giger Inspired)

Rules: Spell your URL with kpop songs, then tag 10 people

tagged by @chasang thnk u uwu

E- Echo by VIXX
T- Ttanttara by Alpha:BAT
H- Heart Attack by AOA
E- Everybody by SHINee
R- Re-Bye by AKMU
E- Error by VIXX
A- All In by Monsta X
L- Love Paint (Every Afternoon) by Nu’est
T- Think About You by Jun.K
A- Amazing Bad Lady by Cross Gene
E- Exquisite! by CocoSori
K- Knock by KNK

this was a lot of fun tbh i dont have any friends but i tag @leehongbiin @jonghyunbase @princedaeguni @pstwo @onevvsgf @fallarbor-town @evbev and any1 else who wants to !!


SHARPLESS2-240/SIMEIS147 by Bert Mettier
Via Flickr:
L=6X10’, RGB=3X10’ EACH H-ALPHA 6X20’ Televue NP-101 F/5.4, Paramount ME, SBIG STXL-11002 Unterwasser, Switzerland, N 47°12’ 28 E 9°18’ 58

The Helix Nebula

One of the closest planetary nebulae to Earth, the Helix Nebula is estimated to be about 650 light years away and span nearly 2.5 light years across its major axis. 

This 16 hour total H-alpha exposure of NGC 7293 captures the very faint outer regions of the nebula. Many of the exposures that went into compiling this image were taken around the time of Full Moon.

Credit: David M. Jurasevich