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Bortle scale - Wikipedia

🧵(3/3) Bortle scale for light pollution

en.wikipedia.org/wiki/Bortle_...

The Bortle dark-sky scale (usually referred to as simply the Bortle scale) is a nine-level numeric scale that measures the night sky's brightness of a particular location. It characterizes the observability of celestial objects, taking into account the interference caused by light pollution. Amateur astronomer John E. Bortle created the scale and published it in the February 2001 edition of Sky & Telescope magazine to help skywatchers evaluate and compare the darkness of night-sky observing sites.

🧵(2/3) Cropped version to see the detail of the iris. This shot is particularly hard for me since I'm in a light polluted area (Bortle 8).

No filters were used.

#Astrophotography #Space #DeepSpace #Astronomy

The Iris Nebula (also known as NGC 7023 and Caldwell 4) is a bright reflection nebula in the constellation Cepheus. The designation NGC 7023 refers to the open cluster within the larger reflection nebula designated LBN 487. The nebula, which shines at magnitude +6.8, is illuminated by a magnitude +7.4 star designated HD 200775.[1] It is located near the Mira-type variable star T Cephei, and near the bright magnitude +3.23 variable star Beta Cephei (Alfirk). It lies 1,300 light-years away and is six light-years across.

🧵(1/3) The Iris Nebula (also known as NGC 7023 and Caldwell 4) is a bright reflection nebula in the constellation Cepheus.

Shot taken on 2025-08-01 from my backyard

🔭: William Optics Pleiades 111
📷: ZWO ASI 2600
Total exposure: 56 x 120 sec (1h52)

#Astrophotography #Space #DeepSpace #Astronomy

Thanks Paul. This taken over several nights.

Here’s my version of Andromeda taken last year from my garden with 12 hours of integration: bsky.app/profile/star...

Let me know if you’re willing to share those subs. I would like to see what’s hidden in your data. You can DM me.

Ok wow, you do have quite a bit of data. There’s room to extract a lot of beauty out of that data set. Thanks for answering.

Nice shot David. How much exposure time? What camera and setup?

Outstanding shot. Bravo 👏

Looking lovely 🔥

🧵(2/2) Of course, here are a starless versions of the Cygnus Loop to enjoy the sheer beauty of the object.

Full size version here 👇
telescopius.com/pictures/vie...

#Astrophotography #Space #DeepSpace #Astronomy

The Cygnus Loop (radio source W78, or Sharpless 103) is a large supernova remnant (SNR) in the constellation Cygnus Shot taken on 2025-07-18 from my backyard 🔭: William Optics Pleiades 111 📷: ZWO ASI 2600 Total exposure: 4 x 8 x 180 sec (1h05) #Astrophotography #Space #DeepSpace #Astronomy

Detail of The Cygnus Loop (radio source W78, or Sharpless 103) is a large supernova remnant (SNR) in the constellation Cygnus Shot taken on 2025-07-18 from my backyard 🔭: William Optics Pleiades 111 📷: ZWO ASI 2600 Total exposure: 4 x 8 x 180 sec (1h05) #Astrophotography #Space #DeepSpace #Astronomy

🧵(1/2) The Cygnus Loop is a large supernova remnant (SNR) in the constellation Cygnus. This is a 4 panels mosaic.

Shot taken on 2025-07-18 from my backyard

🔭: William Optics Pleiades 111
📷: ZWO ASI 2600
Total exposure: 4 x 8 x 180 sec (1h05)

#Astrophotography #Space #DeepSpace #Astronomy

I hope this answer your question?

PixInsight and Photoshop

Thanks Gerry 🙏

starless versions of the Tulip to enjoy the sheer beauty of the object. #Astrophotography #Space #DeepSpace #Astronomy

Cropped starless versions of the Tulip to enjoy the sheer beauty of the object. #Astrophotography #Space #DeepSpace #Astronomy

🧵(2/2) Of course, here are a starless versions of the Tulip to enjoy the sheer beauty of the object.

#Astrophotography #Space #DeepSpace #Astronomy

🧵(1/2) The Tulip Nebula (Sh 2-101) is an emission nebula in the constellation Cygnus, about 6000 light-years away from Earth. Shot taken on 2025-06-22 from my backyard. 🔭: William Optics Pleiades 111 📷: ZWO ASI 2600 Total exposure: 13x300 sec (1h05) #Astrophotography #Space #DeepSpace #Astronomy

🧵(1/2) Cropped version of The Tulip Nebula (Sh 2-101) is an emission nebula in the constellation Cygnus, about 6000 light-years away from Earth. Shot taken on 2025-06-22 from my backyard. 🔭: William Optics Pleiades 111 📷: ZWO ASI 2600 Total exposure: 13x300 sec (1h05) #Astrophotography #Space #DeepSpace #Astronomy

🧵(1/2) The Tulip Nebula (Sh 2-101) is an emission nebula in the constellation Cygnus. Re-processed my data for more detail.

Shot taken on 2025-06-22 from my backyard.

🔭: William Optics Pleiades 111
📷: ZWO ASI 2600
Total exposure: 13 x 300 sec (1h05)

#Astrophotography #Space #DeepSpace #Astronomy

Thanks Peter 🙏

As always, here's a starless version to see the intricacy of this celestial object. Looks more like a brain floating in space.

As always, here's a cropped starless version to see the intricacy of this celestial object. Looks more like a brain floating in space.

🧵(2/2) As always, here's a starless version to see the intricacy of this celestial object. Looks more like a brain floating in space.

#Astrophotography #Space #DeepSpace #Astronomy

🧵(1/2) The Crescent Nebula (NGC 6888). Reprocessed with better detail. Shot taken on 2025-06-22 from my backyard. 🔭: William Optics Pleiades 111 📷: ZWO ASI 2600 + Filter L-Extreme Total exposure: 1200 sec #Astrophotography #Space #DeepSpace #Astronomy

Detail of The Crescent Nebula (NGC 6888). Reprocessed with better detail. Shot taken on 2025-06-22 from my backyard. 🔭: William Optics Pleiades 111 📷: ZWO ASI 2600 + Filter L-Extreme Total exposure: 1200 sec #Astrophotography #Space #DeepSpace #Astronomy

🧵(1/2) The Crescent Nebula (NGC 6888) is an emission nebula. Reprocessed with better detail.

Shot taken on 2025-06-22 from my backyard.

🔭: William Optics Pleiades 111
📷: ZWO ASI 2600 + Filter L-Extreme
Total exposure: 1200 sec

#Astrophotography #Space #DeepSpace #Astronomy

Thanks Peter 🙏

🧵/3
Here's a comparison to show what a filter plus more exposure can do.
On the left: 85 minutes exposure + a dual band filter
On the right: 2 minutes exposure with no filter

#Astrophotography #Space #DeepSpace #Astronomy

Starless version of Messier 27, The Dumbbell Nebula (also known as the Apple Core Nebula). Retaken with more exposure. Shot taken on 2025-07-4 from my backyard Telescope : William Optics Pleiades 111 Camera : ZWO ASI 2600 + L-Extreme Filter Total exposure: 85 minutes #Astrophotography #Space #DeepSpace #Astronomy

🧵/2
Starless version to show the beauty of the object

#Astrophotography #Space #DeepSpace #Astronomy

Messier 27, The Dumbbell Nebula (also known as the Apple Core Nebula). Retaken with more exposure. Shot taken on 2025-07-4 from my backyard Telescope : William Optics Pleiades 111 Camera : ZWO ASI 2600 + L-Extreme Filter Total exposure: 85 minutes #Astrophotography #Space #DeepSpace #Astronomy

🧵/1
Messier 27, The Dumbbell Nebula (also known as the Apple Core Nebula). Retaken with more exposure

Shot taken on 2025-07-4 from my backyard

Telescope: William Optics Pleiades 111
Camera: ZWO ASI 2600 + L-Extreme Filter
Total exposure: 85 minutes

#Astrophotography #Space #DeepSpace #Astronomy

Wow, haven’t heard from you in a long time. Nice to read you again.

Thanks Sue 🙏

Well done. Your version is harder since the moon is much brighter 👍

Image of the Moon and Mars in the same field of view

Image of Mars enlarged quite a bit

Moon and Mars taken in the same frame. It's a first for me. Mars is only about 3 or 4 pixels wide 😆.

Shot taken on 2025-06-29 from my backyard.

Telescope : William Optics Pleiades 111
Camera : ZWO ASI 2600
Exposure: best 50% of (5000 x 4 millisec)

#Astrophotography #Space #Planetary #Astronomy

Starless version of the Tulip Nebula (cropped)

Here is a starless version of the Tulip

#Astrophotography #Space #DeepSpace #Astronomy

Sharpless 101 (Sh 2-101) is a H II region[1] emission nebula located in the constellation Cygnus. It is sometimes also called the Tulip Nebula because it appears to resemble the outline of a tulip when imaged photographically. It was catalogued by astronomer Stewart Sharpless in his 1959 catalog of nebulae. It lies at a distance of about 6,000 light-years (5.7×1016 km; 3.5×1016 mi) from Earth. Sh 2-101, at least in the field seen from Earth, is in close proximity to microquasar Cygnus X-1, site of one of the first suspected black holes. Cygnus X-1 is located about 15′ west of Sh 2-101. The companion star of Cygnus X-1 is a spectral class O9.7 Iab supergiant with a mass of 21 solar masses and 20 times the radius of the Sun. The period of the binary system is 5.8 days and the pair is separated by 0.2 astronomical units. The black hole has a mass of 15 solar masses and a Schwarzschild radius of 45 km.

🧵(1/2) The Tulip Nebula (Sh 2-101) is an emission nebula in the constellation Cygnus, about 6000 light-years away from Earth.

Shot taken on 2025-06-22 from my backyard.

🔭: William Optics Pleiades 111
📷: ZWO ASI 2600
Total exposure: 13x300 sec (1h05)

#Astrophotography #Space #DeepSpace #Astronomy