Ronald Bijtenhoorn
@astronald.bsky.social
🏠 Heemskerk (NL) | 🔭 Amateurastronoom
🌍 Website: www.bijtenhoorn.nl
RUIMTESOEP -Observaties vanuit mijn Achtertuin
🌍 Website: www.bijtenhoorn.nl
RUIMTESOEP -Observaties vanuit mijn Achtertuin
🔭 The Sun in H-alpha - First light with my new Lunt telescope! I captured an image between the passing clouds, just before the Sun disappeared behind our house.
There’s still plenty of room for improvement but I’m quite happy with this first photo nonetheless. 😀
#Astrophotography #lunt #halpha #sun
There’s still plenty of room for improvement but I’m quite happy with this first photo nonetheless. 😀
#Astrophotography #lunt #halpha #sun
November 9, 2025 at 3:21 PM
🔭 The Sun in H-alpha - First light with my new Lunt telescope! I captured an image between the passing clouds, just before the Sun disappeared behind our house.
There’s still plenty of room for improvement but I’m quite happy with this first photo nonetheless. 😀
#Astrophotography #lunt #halpha #sun
There’s still plenty of room for improvement but I’m quite happy with this first photo nonetheless. 😀
#Astrophotography #lunt #halpha #sun
🔭 Earlier this evening, before the Moon rose, I spent about an hour tracking Comet C/2025 R2 (SWAN). Its brightness has now dropped to magnitude 8.4 and after rounding the Sun, the comet is heading back toward the distant regions beyond the Kuiper Belt.
#Astrophotography #seestar #c2025r2 #comet
#Astrophotography #seestar #c2025r2 #comet
November 7, 2025 at 9:19 PM
🔭 Earlier this evening, before the Moon rose, I spent about an hour tracking Comet C/2025 R2 (SWAN). Its brightness has now dropped to magnitude 8.4 and after rounding the Sun, the comet is heading back toward the distant regions beyond the Kuiper Belt.
#Astrophotography #seestar #c2025r2 #comet
#Astrophotography #seestar #c2025r2 #comet
🔭 Last night the clouds suddenly cleared, so I quickly set up the Seestar outside. I was able to capture the Iris Nebula for about 2 hours (until it started raining again at 10:15 p.m.) 😀
* Distance: 1,300 lj
* Const: Cepheus
* Mag: 6.8
#Astrophotography #seestar #NGC7023 @kat-astro-bot.bsky.social
* Distance: 1,300 lj
* Const: Cepheus
* Mag: 6.8
#Astrophotography #seestar #NGC7023 @kat-astro-bot.bsky.social
November 2, 2025 at 1:12 PM
🔭 Last night the clouds suddenly cleared, so I quickly set up the Seestar outside. I was able to capture the Iris Nebula for about 2 hours (until it started raining again at 10:15 p.m.) 😀
* Distance: 1,300 lj
* Const: Cepheus
* Mag: 6.8
#Astrophotography #seestar #NGC7023 @kat-astro-bot.bsky.social
* Distance: 1,300 lj
* Const: Cepheus
* Mag: 6.8
#Astrophotography #seestar #NGC7023 @kat-astro-bot.bsky.social
🔭 Over the past few days, I’ve tried several times to capture comet C/2025 A6 (Lemmon) again.
Last night, I finally managed to do it! The conditions weren’t great and I couldn’t see it with the naked eye, but luckily I could spot it through my binoculars.
#Astrophotography #seestar #c2025a6 #comet
Last night, I finally managed to do it! The conditions weren’t great and I couldn’t see it with the naked eye, but luckily I could spot it through my binoculars.
#Astrophotography #seestar #c2025a6 #comet
October 29, 2025 at 12:42 PM
🔭 Over the past few days, I’ve tried several times to capture comet C/2025 A6 (Lemmon) again.
Last night, I finally managed to do it! The conditions weren’t great and I couldn’t see it with the naked eye, but luckily I could spot it through my binoculars.
#Astrophotography #seestar #c2025a6 #comet
Last night, I finally managed to do it! The conditions weren’t great and I couldn’t see it with the naked eye, but luckily I could spot it through my binoculars.
#Astrophotography #seestar #c2025a6 #comet
🔭 Last night I set up the Seestar to capture M15 — a globular star cluster in Pegasus.
Over 12 billion years old and among the oldest objects in our galaxy, M15 has an exceptionally dense core that may contain a massive black hole. 😀
#Astrophotography #seestar #M15 @kat-astro-bot.bsky.social
Over 12 billion years old and among the oldest objects in our galaxy, M15 has an exceptionally dense core that may contain a massive black hole. 😀
#Astrophotography #seestar #M15 @kat-astro-bot.bsky.social
October 14, 2025 at 6:10 PM
🔭 Last night I set up the Seestar to capture M15 — a globular star cluster in Pegasus.
Over 12 billion years old and among the oldest objects in our galaxy, M15 has an exceptionally dense core that may contain a massive black hole. 😀
#Astrophotography #seestar #M15 @kat-astro-bot.bsky.social
Over 12 billion years old and among the oldest objects in our galaxy, M15 has an exceptionally dense core that may contain a massive black hole. 😀
#Astrophotography #seestar #M15 @kat-astro-bot.bsky.social
🔭 This morning I set my alarm for 4:00 AM to try to capture comet C/2025 A6 (Lemmon). After waking up, I looked outside and saw Jupiter in the sky, so no clouds! 😀
But the conditions weren’t ideal though, so hopefully, I’ll get another chance soon.
#Astrophotography #seestar #c2025a6 #comet
But the conditions weren’t ideal though, so hopefully, I’ll get another chance soon.
#Astrophotography #seestar #c2025a6 #comet
September 28, 2025 at 1:53 PM
🔭 This morning I set my alarm for 4:00 AM to try to capture comet C/2025 A6 (Lemmon). After waking up, I looked outside and saw Jupiter in the sky, so no clouds! 😀
But the conditions weren’t ideal though, so hopefully, I’ll get another chance soon.
#Astrophotography #seestar #c2025a6 #comet
But the conditions weren’t ideal though, so hopefully, I’ll get another chance soon.
#Astrophotography #seestar #c2025a6 #comet
NGC 6946 (The Fireworks Galaxy) is a bright spiral galaxy in the constellation Cepheus.
NGC 6946 was nicknamed the Fireworks Galaxy because it has hosted 10 supernovae over the last century, which is more than any other known galaxy.
#Astrophotography #seestar #NGC6946 @kat-astro-bot.bsky.social
NGC 6946 was nicknamed the Fireworks Galaxy because it has hosted 10 supernovae over the last century, which is more than any other known galaxy.
#Astrophotography #seestar #NGC6946 @kat-astro-bot.bsky.social
September 24, 2025 at 1:37 PM
NGC 6946 (The Fireworks Galaxy) is a bright spiral galaxy in the constellation Cepheus.
NGC 6946 was nicknamed the Fireworks Galaxy because it has hosted 10 supernovae over the last century, which is more than any other known galaxy.
#Astrophotography #seestar #NGC6946 @kat-astro-bot.bsky.social
NGC 6946 was nicknamed the Fireworks Galaxy because it has hosted 10 supernovae over the last century, which is more than any other known galaxy.
#Astrophotography #seestar #NGC6946 @kat-astro-bot.bsky.social
🔭 M27 - The Dumbbell Nebula is a planetary nebula in the constellation Vulpecula, at a distance of about 1360 light-years and has brightness of magnitude 7.5.
#Astrophotography #seestar #M27 @kat-astro-bot.bsky.social
#Astrophotography #seestar #M27 @kat-astro-bot.bsky.social
September 8, 2025 at 1:13 PM
🔭 M27 - The Dumbbell Nebula is a planetary nebula in the constellation Vulpecula, at a distance of about 1360 light-years and has brightness of magnitude 7.5.
#Astrophotography #seestar #M27 @kat-astro-bot.bsky.social
#Astrophotography #seestar #M27 @kat-astro-bot.bsky.social
🔭 NGC6990 - The Western Veil Nebula is part of the Cygnus Loop, a supernova remnant in the constellation Cygnus. 😀
#Astrophotography #seestar #ngc6990 @kat-astro-bot.bsky.social
#Astrophotography #seestar #ngc6990 @kat-astro-bot.bsky.social
September 6, 2025 at 4:31 PM
🔭 NGC6990 - The Western Veil Nebula is part of the Cygnus Loop, a supernova remnant in the constellation Cygnus. 😀
#Astrophotography #seestar #ngc6990 @kat-astro-bot.bsky.social
#Astrophotography #seestar #ngc6990 @kat-astro-bot.bsky.social
🔭 NGC6992 - The Eastern Veil Nebula is part of the Cygnus Loop, a supernova remnant in the constellation Cygnus.
#Astrophotography #seestar #NGC6992 @kat-astro-bot.bsky.social
#Astrophotography #seestar #NGC6992 @kat-astro-bot.bsky.social
September 2, 2025 at 5:13 PM
🔭 NGC6992 - The Eastern Veil Nebula is part of the Cygnus Loop, a supernova remnant in the constellation Cygnus.
#Astrophotography #seestar #NGC6992 @kat-astro-bot.bsky.social
#Astrophotography #seestar #NGC6992 @kat-astro-bot.bsky.social
🔭 Last attempt to capture the Orion Nebula (M42), it slowly disappears into the evening twilight to reappear in the early morning of September.
#Astrophotography #seestar #M42 @kat-astro-bot.bsky.social
#Astrophotography #seestar #M42 @kat-astro-bot.bsky.social
April 7, 2025 at 6:20 PM
🔭 Last attempt to capture the Orion Nebula (M42), it slowly disappears into the evening twilight to reappear in the early morning of September.
#Astrophotography #seestar #M42 @kat-astro-bot.bsky.social
#Astrophotography #seestar #M42 @kat-astro-bot.bsky.social
🔭 The Moon close to the Pleiades (M45)
#astrophotography
#astrophotography
April 1, 2025 at 8:53 PM
🔭 The Moon close to the Pleiades (M45)
#astrophotography
#astrophotography
Compilation of the partial solar eclipse, during the maximum at 12:10 about 24% of the sun was covered.
It was a bit of a challenge to take the pictures between the clouds. 😊
🔭 #seestar #eclips #solareclips #sun #moon
It was a bit of a challenge to take the pictures between the clouds. 😊
🔭 #seestar #eclips #solareclips #sun #moon
March 29, 2025 at 1:20 PM
Compilation of the partial solar eclipse, during the maximum at 12:10 about 24% of the sun was covered.
It was a bit of a challenge to take the pictures between the clouds. 😊
🔭 #seestar #eclips #solareclips #sun #moon
It was a bit of a challenge to take the pictures between the clouds. 😊
🔭 #seestar #eclips #solareclips #sun #moon
I have added two books to my 🔭 astro library this weekend.
I got my hands on a second-hand french version of Rükl's Moon Atlas.
And further I came across 'Planetary Astronomy' by Christophe Pellier to learn more about capturing and editing planetary photos.
Happy reader! 😀
I got my hands on a second-hand french version of Rükl's Moon Atlas.
And further I came across 'Planetary Astronomy' by Christophe Pellier to learn more about capturing and editing planetary photos.
Happy reader! 😀
March 24, 2025 at 7:40 PM
I have added two books to my 🔭 astro library this weekend.
I got my hands on a second-hand french version of Rükl's Moon Atlas.
And further I came across 'Planetary Astronomy' by Christophe Pellier to learn more about capturing and editing planetary photos.
Happy reader! 😀
I got my hands on a second-hand french version of Rükl's Moon Atlas.
And further I came across 'Planetary Astronomy' by Christophe Pellier to learn more about capturing and editing planetary photos.
Happy reader! 😀
🔭 First try to capture #Jupiter with the ZWO ASI664MC on my 6” SCT from our backyard
Circumstances were not ideal; 3 months after opposition and Jupiter just visible above our rooftop.
Still a lot to learn about capturing and post-processing but happy with this first result! 😀
#Astrophotography
Circumstances were not ideal; 3 months after opposition and Jupiter just visible above our rooftop.
Still a lot to learn about capturing and post-processing but happy with this first result! 😀
#Astrophotography
March 19, 2025 at 11:03 AM
🔭 First try to capture #Jupiter with the ZWO ASI664MC on my 6” SCT from our backyard
Circumstances were not ideal; 3 months after opposition and Jupiter just visible above our rooftop.
Still a lot to learn about capturing and post-processing but happy with this first result! 😀
#Astrophotography
Circumstances were not ideal; 3 months after opposition and Jupiter just visible above our rooftop.
Still a lot to learn about capturing and post-processing but happy with this first result! 😀
#Astrophotography
🔭 M1 - Crab Nebula, remnant of a supernova observed by Chinese and Japanese observers in 1054.
Distance 6500 Light Year; Magnitude 8.4
Photo taken with the #seestar ; exposure time 48 min 😀
Distance 6500 Light Year; Magnitude 8.4
Photo taken with the #seestar ; exposure time 48 min 😀
December 27, 2024 at 3:44 PM
🔭 M1 - Crab Nebula, remnant of a supernova observed by Chinese and Japanese observers in 1054.
Distance 6500 Light Year; Magnitude 8.4
Photo taken with the #seestar ; exposure time 48 min 😀
Distance 6500 Light Year; Magnitude 8.4
Photo taken with the #seestar ; exposure time 48 min 😀
The Lagoon nebula (Messier 8) is a giant interstellar cloud in the constellation Sagittarius and located on a distance of approximately 4100 light years from earth and has a brightness of Magnitude 6.0
Photo taken last September in France with the #seestar; exposure time 33 min 😀
#astrophotography
Photo taken last September in France with the #seestar; exposure time 33 min 😀
#astrophotography
November 20, 2024 at 11:07 AM
The Lagoon nebula (Messier 8) is a giant interstellar cloud in the constellation Sagittarius and located on a distance of approximately 4100 light years from earth and has a brightness of Magnitude 6.0
Photo taken last September in France with the #seestar; exposure time 33 min 😀
#astrophotography
Photo taken last September in France with the #seestar; exposure time 33 min 😀
#astrophotography
The Triangulum Galaxy (M33) is a spiral galaxy and is together with the Andromeda Galaxy, the Milky Way and a group of smaller galaxies part of the 'Local Group' of galaxies.
Distance 3 million Lj; Mag 5.7
Photo taken with the Seestar; exposure time 62 min 😀
#astronomy #astrophotography #seestar
Distance 3 million Lj; Mag 5.7
Photo taken with the Seestar; exposure time 62 min 😀
#astronomy #astrophotography #seestar
November 17, 2024 at 6:45 PM
The Triangulum Galaxy (M33) is a spiral galaxy and is together with the Andromeda Galaxy, the Milky Way and a group of smaller galaxies part of the 'Local Group' of galaxies.
Distance 3 million Lj; Mag 5.7
Photo taken with the Seestar; exposure time 62 min 😀
#astronomy #astrophotography #seestar
Distance 3 million Lj; Mag 5.7
Photo taken with the Seestar; exposure time 62 min 😀
#astronomy #astrophotography #seestar
The Andromeda Galaxy (M31), the close neighbor of our Milky Way. Located on a distance of about 2.5 million light years and it’s the most distant object visible to the naked eye.
The photo was composed with the new mosaic function of the Seestar. 😀
#astronomy #Astrophotography #seestar
The photo was composed with the new mosaic function of the Seestar. 😀
#astronomy #Astrophotography #seestar
November 16, 2024 at 9:51 AM
The Andromeda Galaxy (M31), the close neighbor of our Milky Way. Located on a distance of about 2.5 million light years and it’s the most distant object visible to the naked eye.
The photo was composed with the new mosaic function of the Seestar. 😀
#astronomy #Astrophotography #seestar
The photo was composed with the new mosaic function of the Seestar. 😀
#astronomy #Astrophotography #seestar