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C’è un momento preciso in cui il cosmo smette di essere astronomia…
e diventa qualcosa che assomiglia più a un incidente in corso.
La Nebulosa Crescent è uno di quei momenti.
Non è una nuvola.
Non è un ornamento del cielo.
È il risultato di una stella che sta letteralmente cercando di sopravvivere a sé stessa.
Quella che chiamiamo Nebulosa Crescent, catalogata come NGC 6888, non è nata per “assomigliare” a qualcosa.
La forma a mezzaluna è un effetto collaterale.
Un residuo geometrico di forze in conflitto.
Si trova nella costellazione del Cigno e la sua luce ha viaggiato per circa 5.000 anni prima di arrivare fino a noi.
Al centro di tutto c’è WR 136.
Una stella Wolf-Rayet.
E già questo basta per capire il problema.
Non sono stelle “normali”.
Sono stelle che hanno consumato quasi tutto il loro combustibile e hanno iniziato a comportarsi in modo estremo.
Secondo le osservazioni spettroscopiche raccolte da missioni come Hubble (NASA/ESA) e da telescopi terrestri ad alta risoluzione:
WR 136 perde massa a velocità impressionanti, tramite venti stellari che superano milioni di chilometri orari.
Non sta “soffiando via gas”.
Sta letteralmente smontando i propri strati esterni.
La Nebulosa Crescent non è un’esplosione.
È uno scontro.
Per farti capire la suddivido in fasi:
Prima fase: la stella espelle materiale più lento.
Seconda fase: diventa Wolf-Rayet e inizia a emettere vento stellare molto più veloce.
Terza fase: Quando il secondo flusso raggiunge il primo…non lo attraversa.
Lo schiaccia, lo comprime e lo illumina.
E da questa collisione nasce la struttura che vediamo.
Una bolla instabile che si espande nello spazio interstellare come un’onda d’urto tridimensionale.
Quello che appare come “bello” nelle immagini astronomiche è in realtà un codice fisico.
Le osservazioni spettroscopiche mostrano che:
* il verde-blu è ossigeno ionizzato (O III)
* il rosso intenso è idrogeno eccitato (H-alpha)
Non sono colori estetici.
Sono stati energetici della materia.
È come se la nebulosa stesse parlando…
ma in una lingua che non è fatta per gli occhi umani.
La Nebulosa Crescent non è una struttura stabile.
È una fase, un passaggio.
Le simulazioni evolutive delle stelle Wolf-Rayet indicano che sistemi come WR 136 sono destinati a cambiare radicalmente su scale di tempo relativamente brevi (astronomicamente parlando).
Molte termineranno la loro vita in una supernova.
Un evento così energetico da superare l’intera luminosità della galassia per un breve periodo.
E quando succederà, la Crescent scomparirà, non lentamente, non poeticamente, semplicemente verrà cancellata da un altro evento fisico più potente.
La cosa bella di questa nebulosa è che all’interno di essa stanno nascendo stelle, pianeti e perché no anche nuove forme di vita.
Perché come dice il primo principio della termodinamica, nulla si crea, nulla si distrugge ma tutto si trasforma.
15 MARZO 2021
3671 sec - Frames da 1 minuto
TS OPTICS 80/540
ASI 290 COLOR
FOCAL REDUCER 0,5
SHARPCAP
PHOTOSHOP
A comet streaks across a dark night sky, dotted with distant stars. No specific person is identifiable in the image, but the image shows a celestial event, likely captured by an amateur astronomer or astrophotographer. The comet's tail is visible, indicating its movement through space. The image's purpose is likely to document and share the observation of this astronomical phenomenon.
A Whisper from the Long Night: Comet 24P/Schaumasse
On December 30, 2026, beneath the still and patient sky of Desert Bloom Observatory, Comet 24P/Schaumasse revealed itself not as a spectacle, but as a whisper. At a modest magnitude of 9.4, its light arrived faint and restrained, a reminder that not all celestial travelers announce their presence with grandeur. Ten stacked exposures of 600 seconds were required to gather enough ancient photons to form this image—each one a fragment of sunlight reflected by ice and dust released as the comet slowly warms. The absence of a pronounced tail is not a failure of vision, but a lesson in physics: low activity, distance from the Sun, and limited gas production all conspire to keep its signature subtle. This image teaches patience—how astronomy rewards those who listen carefully to the dark, where even the quietest messengers still carry the story of the early solar system.
The Rosette Nebula is a large spherical H II region around open cluster NGC 2244. The stars of the cluster having been formed from the nebula's matter. The cluster and nebula lie at a distance of some 5,000 light years from Earth and measure roughly 130 light years in diameter.
Sky-Watcher 80ED 600mm
Sky-Watcher 0.85x Reducer/Flattener
Sky-Watcher HEQ5
Canon 450Dm
73x600s (12h 10min)
Elephant's Trunk Nebula is a nebula, a structure of gas and dust, located in the constellation Cepheus. It belongs to a lot larger emission nebula IC 1396 (the entire red object in the image). The elephant's trunk itself is only a small part (in the middle of the crop in the second image), which really looks like a curled elephant's trunk. The whole nebula is ionized by a massive star in the center and is home to very young stars. It lies at a distance of 2400 light years and has a size of 6 full moons in the night sky!
The obviously red star at the edge of the nebula is called Herschel's Garnet Star or Erakis. It was noted by William Heschel, who described it as "a very fine deep garnet colour, such as the periodical star Omicron Ceti (variable star in Cetus)". It is one of the largest known stars with a radius of around 1.2 billion km and is expected to explode "soon" like a supernova and become a black hole.
There is also a part of Sh2-129 (the Squid Nebula) in the lower right corner.
I took this image in August with my modified Canon EOS 1300D and CLS filter. It was made from only less than two hours because of a short night and clouds, but it still looks pretty good.
Canon EOS 1300D (modified), SVBony CLS filter
Sigma 135mm f/2.8
iOptron SkyGuider Pro
EXIF: 104x60sec (1 hour 44 minutes in total), ISO 6400, f/5.6
Darks, flats, dark flats, biases
Processed in DSS, Siril, StarNet++ and Photoshop
14/08/2023, Mašov, Czech Republic (Bortle 5)
The Cygnus constellation is full of various hydrogen nebulae, but they are very faint in visible wavelengths, so it's very difficult to see them with your eyes in a telescope. However, when you use a modified camera, which lets the infrared wavelengths go through, and you take a long exposure, the complicated nebulae will appear.
One of the brightest nebulae in Cygnus (which is even visible in big telescopes) is called the Crescent Nebula and lies roughly in the center of my image. In the upper right corner, there you can also see Tulipan nebula (or Sh2-101), which is fainter than Crescent and lies at a distance of 6000 light years, which is about 1300 ly further than Crescent. Another interesting region lies in the bottom left corner. It's a Sadr region, which is named after a Sadr star, which is the brightest star in the picture and lies 1800 light years from Earth.
This image was taken on the 7th of July with my modified camera Canon EOS 1300D and CLS filter, which lets only H-alpha and OIII parts of the spectrum pass through and that's why, it can capture such beautiful details in the nebulae. The result amazed me. It is created only from 3 hours of data, which isn't pretty much for this region. Truly happy with this progress and looking forward to the next tries.
Canon EOS 1300D (modified), SVBony CLS filter
Sigma 135mm f/2.8
iOptron SkyGuider Pro
EXIF: 120x90sec (3 hours in total), ISO 3200, f/5.6
Darks, flats, dark flats, biases
Processed in DSS, Siril, StarNet++, and Photoshop
07/07/2023, Mašov, Czech Republic (Bortle 5)
My very first experience in AP without any cropping. Still learning the craft and post processing (if you're in AP this is very obvious just by looking at the picture).
Orion, Running Man, Flame, and Horsehead nebulae under Bortle 4 skies
Details:
-Stock Canon Rebel T7 on Star Adventurer
-135mm Rokinon lens at f/2, ISO 800 and 45 minute-long exposures stacked in Deep Sky Stacker along with calibration frames (50 bias, 20 dark, and 30 flat frames)
-Total integration time of 45 minutes
-Final stacked image histogram stretched and color-corrected in Photoshop
-Starnet++ used to separate and color-enhance surrounding nebulosity in photoshop, final result was merged with stars and cropped
Originally captured on 03.06.2020, I thought I had significant light pollution and lost the image. Having more experience doing post processing, I was able to pull this out. Very proud of it considering I am still new to the hobby
The Nebula in the image is The Elephant's Trunk Nebula (IC 1396A). This beautiful deepskyobject can be found in the constellation of Cepheus and it is about 2, 400 lightyears away from us. The Elephant's Trunk Nebula is a part of much larger gas region and it is a concentration of interstellar gas and dust.
Image has been photographed with:
Telescope: Ts-Optics 154/600 Newton telescope (6" Photon f4)
Camera: ZWO ASI 585MM Pro
Filters (omegon 1,25" Narrowband 12Nm): SII, Ha, OIII
Exposure: SII 13 x 300 sec, Ha 36 x 300 sec, OIII 13 x 300 sec
Mount Skywatcher HEQ5 Pro
Guiding ZWO ASI 290MC+ omegon guidescope module finder
Software:
Imaging N.I.N.A and PHD2
Processing: Pixinsight
Location: Pori, Finland
M31 Andromeda Galaxy
This galaxy is located 2,495,096 Light Years from Earth.
First photo taken with the Seestar S30.
Taken on 12-13-2025
I created this mosaic with a ZenithStar 61ii throughout August, September, and October 2021. Each panel integrated a minimum of 7 hours of 6 minute exposures at dual narrowband. The mosaic shown here integrates 107.5 hours of photons.
Take a look for the Heart Nebula, Soul Nebula, Fish Head Nebula, quite a few planetary nebulas, and quite a few more hydrogen-rich formations.
For each panel, I extracted and stacked Ha and [OIII] separately, then processed to remove light pollution.
I then stitched separate mosaics for Ha and [OIII] and combined them with an HOO2 palette.
I found that taking adding 3-6 panels at a time and carefully matching across boundaries was helpful in building a consistent mosaic. I also found that the LNC typically suggested for mosaics (LNC degree 4, 3 iterations) introduced wavy artifacts across the mosaic, but blending with simple MBB (20% overlap) gave a much better result since I had already reduced light pollution from the individual panels.
See more views and acquisition details at astrobin: www.astrobin.com/ar32lb
Bright nebula in Cygnus.
Optical: TEC 140 FL with Astro Physics Quad TCC 0.72
Camera: ZWO ASI2600MC-Pro
Filter: Optolong L-Ultimate
Mount: iOptron CEM70G
60 x 300 second subframes
Processed with PixInsight 1.8, Capture One 23
The Witch Head Nebula under Bortle 4 skies
Technical:
-Stock Canon Rebel T7 on Star Adventurer
-135mm Rokinon lens at f/2, ISO 800 and 105 minute-long exposures stacked in Deep Sky Stacker along with calibration frames (25 bias, 20 dark, and 20 flat frames)
-Total integration time of 105 minutes
-Background gradient removed using graXpert
-Starnet++ used to separate and color-enhance surrounding nebulosity in photoshop, final result was merged with stars and cropped
-Final stacked image histogram stretched and color-corrected in Photoshop
Two known nearby Deep Sky Objects (DSOs). "Eagle" representing the dark region of M16 near the center. Another nickname for the "Swan", "Omega", was given due to the early discovery sketches resembling the last alphabet of the Greek letter.
This is a SHO (Hubble Palette combination). The red uses the Ionized Sulfur (SII) filter, the green uses the Hydrogen Alpha (Ha) filter, and the blue uses the Doubly Ionized Oxygen (OIII) filter. Stack of 13 x 600 seconds for SII and OIII, and 12 x 600 seconds for Ha. Total integration of 6 hours and 20 minutes.
Data credit: Telescope Live
Processing Credit: Addy
The Pleiades star cluster under Bortle 4 skies.
Details:
-Stock Canon Rebel T7 on Star Adventurer Pro
-135mm Rokinon lens at f/2, ISO 800 and 60 minute-long exposures stacked in Deep Sky Stacker along with calibration frames (50bias, 20 flats and 20 dark frames)
-Total integration time of 60 minutes
-Final stacked image histogram stretched and color-corrected in Photoshop
-Starnet++ used to separate and color-enhance surrounding nebulosity in photoshop, final result was merged with stars and cropped
The Andromeda Galaxy under Bortle 2 skies!
Details:
-Stock Canon Rebel T7 on Star Adventurer
-135mm Rokinon lens @f/2, ISO 800 and 53 minute-long exposures stacked in Deep Sky Stacker along with calibration frames (30 bias, 20 flats and 20 dark frames)
-Total integration time of 53 minutes
-Final stacked image histogram stretched and color-corrected in Photoshop
-Starnet++ used to separate and color-enhance galaxy in photoshop, final result was merged with stars
Les dejo un segundo procesado de esta nebulosa que fotografié hace unas semanas y luego de aprender nuevas técnicas creo que quedó mucho mejor de lo que pude hacer la primera vez sin tanto conocimiento. Sigo practicando para llegar a aprovechar cada sesión al máximo.
Esta es NGC 5189, una hermosa nebulosa planetaria espiral que se encuentra a 3000 años luz de la tierra.
Equipo:
Skywatcher 200p - NEQ6 Pro
Guia 50/182mm - QHY 5L IIc
QHY 163m + QHYCFW3
QHY QFocus
Pc Notebook Vivabook
Software:
Apilado WBP
Procesado Pixinsight -Photoshop
The Cygnus Loop under Bortle 3 skies
Details:
-Stock Canon Rebel T7 on Star Adventurer
-135mm Rokinon lens at f/2, ISO 800 and 480 thirty second-long exposures stacked in Deep Sky Stacker along with calibration frames (50 bias, 20 dark, and 20 flat frames)
-Total integration time of 4 hours
-Linear image autostretched in Graxpert
-Starnet++ used to separate and color-enhance surrounding nebulosity in photoshop
-Dust and scratches filter to remove background gradient
-saturation, vibration adjustments, star defringing in Adobe Camera raw
Also known as the Seven Sisters.
Taken in Botle 5 skies with a quarter moon.
Seestar S30
Clarkston, Washington
01-25-2026
Diffuse nebula - Star forming region of Milky Way closest to Earth - approximately 1350 light-years away.
total exposure time - approximately 5 hrs
This is a crop and reprocess of the Heart Nebula, roughly 6 panels of my 15-panel mosaic.
I reprocessed to better balance the ionized hydrogen (shades of gold) and oxygen (shades of blue) and used a lighter touch in Topaz denoising.
Tripod-stabilized shot taken with a LG G8X ThinQ through a Skymax 90 telescope on a Celestron Astromaster AZ tripod, 25mm Super MA Sky-Watcher eyepiece.
North America Nebula (NGC 7000) & Pelican Nebula (IC 5070)
Location: Montclair, California, USA (Bortle 8)
Date: August 19-22, 2022
Moon: Waning Crescent (40-15%)
Camera: ZWO ASI6200MC Pro
Telescope: William Optics ZenithStar 61ii
Flattener: William Optics FLAT61A
Filter: Astronomik L2 UV/IR Block; Antlia ALP-T
Focuser: ZWO EAF
Mount: Sky-Watcher EQ6-R Pro
Guide Camera: ZWO ASI120MM Mini
Guide Scope: William Optics UniGuide 32 f/3.75
Controller: ZWO ASIAIR Pro
Acquisition:
Astronomik L2 UV/IR Block (RGB stars): 53 x 30 sec = 26 min 30 sec
Antlia ALP-T: 137 x 300 sec = 685 min = 11 hr 25 min
Copyright © 2022 Steven K. Wu Photography. All Rights Reserved.