Jörg Altheimer
@jaltheimer.bsky.social
Computer scientist and entrepreneur. Working on archeometallurgy. Physics and spaceflight is my passion though.
Mostly posting #Astrophotography stuff here.
Mostly posting #Astrophotography stuff here.
October 27, 2025 at 7:30 PM
Had a quick glimpse between the clouds on comet C/2025 A6 (Lemmon) in Canes Venatici well after sunset. Composite of around 3 minutes worth of 1 second untracked images.
#Astrophotography
#Astrophotography
October 19, 2025 at 4:54 PM
Had a quick glimpse between the clouds on comet C/2025 A6 (Lemmon) in Canes Venatici well after sunset. Composite of around 3 minutes worth of 1 second untracked images.
#Astrophotography
#Astrophotography
More mushrooms from a local forest. The damp weather really helps them grow very fast.
October 6, 2025 at 8:11 PM
More mushrooms from a local forest. The damp weather really helps them grow very fast.
As expected from this season, its cloudy and no stars in sight. But on the other hand mushroom season is in full swing.
October 6, 2025 at 6:47 PM
As expected from this season, its cloudy and no stars in sight. But on the other hand mushroom season is in full swing.
The Helix Nebula or Caldwell 63 is a planertary nebula in the constellation Aquarius. When it comes to planetary nebulas, it's apparent size is extremely large and its features and structures become visible even in mid sized telescopes. Making it a very interesting #Astrophotography target.
September 22, 2025 at 10:11 PM
The Helix Nebula or Caldwell 63 is a planertary nebula in the constellation Aquarius. When it comes to planetary nebulas, it's apparent size is extremely large and its features and structures become visible even in mid sized telescopes. Making it a very interesting #Astrophotography target.
Neptune and it's moon Triton(which might actually be a captured dwarf planet) in the early morning hours of 6th September.
10 second exposures at f27 where just enough to make Triton visible without resulting in trailing lights.
#Astrophotography
10 second exposures at f27 where just enough to make Triton visible without resulting in trailing lights.
#Astrophotography
September 10, 2025 at 8:20 PM
Neptune and it's moon Triton(which might actually be a captured dwarf planet) in the early morning hours of 6th September.
10 second exposures at f27 where just enough to make Triton visible without resulting in trailing lights.
#Astrophotography
10 second exposures at f27 where just enough to make Triton visible without resulting in trailing lights.
#Astrophotography
Besides the planets there is of course the Moon as a bright target. I tried to utilize the full width and length of an APS-C sensor by using a 2x telecentric barlow. The cropped in images should provide full resolution of some regions.
#Astrophotography
#Astrophotography
September 7, 2025 at 7:38 PM
Besides the planets there is of course the Moon as a bright target. I tried to utilize the full width and length of an APS-C sensor by using a 2x telecentric barlow. The cropped in images should provide full resolution of some regions.
#Astrophotography
#Astrophotography
While Deep Space has to take a back seat in #Astrophotography during the current Moon phase, I'm trying to squeeze out every last bit out of my Deep Space Rig for planetary imaging.
Here is Saturn through my 130mm Newton and Canon EOS 250d.
Here is Saturn through my 130mm Newton and Canon EOS 250d.
September 6, 2025 at 10:09 PM
While Deep Space has to take a back seat in #Astrophotography during the current Moon phase, I'm trying to squeeze out every last bit out of my Deep Space Rig for planetary imaging.
Here is Saturn through my 130mm Newton and Canon EOS 250d.
Here is Saturn through my 130mm Newton and Canon EOS 250d.
To highlight the position in the Image.
It's very faint but definitely in the correct position. Captured on the 18th August 2025 around 20:15 UTC.
It's very faint but definitely in the correct position. Captured on the 18th August 2025 around 20:15 UTC.
August 19, 2025 at 5:42 PM
To highlight the position in the Image.
It's very faint but definitely in the correct position. Captured on the 18th August 2025 around 20:15 UTC.
It's very faint but definitely in the correct position. Captured on the 18th August 2025 around 20:15 UTC.
Not a typical #Astrophotography target, but I really really wanted to try and see if can at least capture a glimpse of the interstellar comet #3I/Atlas shortly after sundown and just before it vanished below the horizon. Challanging with a 130mm newton and a reg. DSLR but it might just have worked.
August 19, 2025 at 5:38 PM
Not a typical #Astrophotography target, but I really really wanted to try and see if can at least capture a glimpse of the interstellar comet #3I/Atlas shortly after sundown and just before it vanished below the horizon. Challanging with a 130mm newton and a reg. DSLR but it might just have worked.
Supernova SN 2025rbs in the galaxy NGC7331 from yesterdays short #Astrophotography session.
My personal first for a type 1a Supernova (The bright spot right next to the galactic nucleus).
My personal first for a type 1a Supernova (The bright spot right next to the galactic nucleus).
August 18, 2025 at 7:11 PM
Supernova SN 2025rbs in the galaxy NGC7331 from yesterdays short #Astrophotography session.
My personal first for a type 1a Supernova (The bright spot right next to the galactic nucleus).
My personal first for a type 1a Supernova (The bright spot right next to the galactic nucleus).
The second picture of this summers #Astrophotography targets.
The Trifid Nebula M20. As with M8 I didn't have nearly as much time as I wanted due to bad weather and short nights, but it is still quite a sight, even at relatively low exposure time.
The Trifid Nebula M20. As with M8 I didn't have nearly as much time as I wanted due to bad weather and short nights, but it is still quite a sight, even at relatively low exposure time.
August 16, 2025 at 7:57 PM
The second picture of this summers #Astrophotography targets.
The Trifid Nebula M20. As with M8 I didn't have nearly as much time as I wanted due to bad weather and short nights, but it is still quite a sight, even at relatively low exposure time.
The Trifid Nebula M20. As with M8 I didn't have nearly as much time as I wanted due to bad weather and short nights, but it is still quite a sight, even at relatively low exposure time.
Not only where the nights extremely short like every summer, the weather also didn't want to play nice for #Astrophotography this year. Which means I wont get any more time on the targets I had selected this year. But I did get a few h on the Lagoon Nebula, despite it being insanely low in the sky.
August 12, 2025 at 10:11 PM
Not only where the nights extremely short like every summer, the weather also didn't want to play nice for #Astrophotography this year. Which means I wont get any more time on the targets I had selected this year. But I did get a few h on the Lagoon Nebula, despite it being insanely low in the sky.
My favourite galaxy cluster for #Astrophotography by far is the Coma Cluster in the constellation Coma Berenices. It might not be as majestic as the Virgo cluster, but the sheer number of small galaxies in the FOV of a medium sized telescope is breathtaking. Imaged with my trusty Canon EOS 250d.
July 7, 2025 at 9:44 PM
My favourite galaxy cluster for #Astrophotography by far is the Coma Cluster in the constellation Coma Berenices. It might not be as majestic as the Virgo cluster, but the sheer number of small galaxies in the FOV of a medium sized telescope is breathtaking. Imaged with my trusty Canon EOS 250d.
T Coronae Borealis still seems to behave.(Or misbehave depending how you view it). No obvious sign of a Nova as of an hour ago.
#Astrophotography
#TCrB
#Astrophotography
#TCrB
June 30, 2025 at 1:10 AM
T Coronae Borealis still seems to behave.(Or misbehave depending how you view it). No obvious sign of a Nova as of an hour ago.
#Astrophotography
#TCrB
#Astrophotography
#TCrB
Every now and then, I'm going after asteroids during #Astrophotography sessions.
Orange was the position of (2)Pallas in the early hours of 28th June. Green is the position in the early hours of 29th. (different cameras on my telescope, so image scale is slightly different).
Orange was the position of (2)Pallas in the early hours of 28th June. Green is the position in the early hours of 29th. (different cameras on my telescope, so image scale is slightly different).
June 29, 2025 at 5:25 PM
Every now and then, I'm going after asteroids during #Astrophotography sessions.
Orange was the position of (2)Pallas in the early hours of 28th June. Green is the position in the early hours of 29th. (different cameras on my telescope, so image scale is slightly different).
Orange was the position of (2)Pallas in the early hours of 28th June. Green is the position in the early hours of 29th. (different cameras on my telescope, so image scale is slightly different).
Just realized that I never imaged the Eagle Nebula before. I used a regular unmodified Canon EOS 250d on my 130/650mm Newton for this little preview. Time was a bit limited since it is already getting bright outside at around 3 in the morning. #M16 #Astrophotography
May 31, 2025 at 7:41 PM
Just realized that I never imaged the Eagle Nebula before. I used a regular unmodified Canon EOS 250d on my 130/650mm Newton for this little preview. Time was a bit limited since it is already getting bright outside at around 3 in the morning. #M16 #Astrophotography
Before the good weather for #Astrophotography is gone I wanted to revisit Messier 13 and also try something different.
So i setup my 130/650mm Newton telescope with a 2x telecentric barlow lens to capture the Hercules Cluster in a bit more detail.
So i setup my 130/650mm Newton telescope with a 2x telecentric barlow lens to capture the Hercules Cluster in a bit more detail.
May 2, 2025 at 5:15 PM
Before the good weather for #Astrophotography is gone I wanted to revisit Messier 13 and also try something different.
So i setup my 130/650mm Newton telescope with a 2x telecentric barlow lens to capture the Hercules Cluster in a bit more detail.
So i setup my 130/650mm Newton telescope with a 2x telecentric barlow lens to capture the Hercules Cluster in a bit more detail.
Weather is a bit better currently. So I was able to setup my telesope for #Astrophotography yesterday. My target for the night was NGC4236. A faint barred spiral galaxy in the M81 Group about 11 million light years from Earth. Small preview with slightly blobby stars thanks to fokus shift.
April 30, 2025 at 6:55 PM
Weather is a bit better currently. So I was able to setup my telesope for #Astrophotography yesterday. My target for the night was NGC4236. A faint barred spiral galaxy in the M81 Group about 11 million light years from Earth. Small preview with slightly blobby stars thanks to fokus shift.
Weather is beginning to look a lot like last year for #Astrophotography. But despite that, I was able to collect some data every now and then on the Rosette Nebula for a little mosaic, with my 130mm Newton. Stacked with DSS and combined with APP.
March 21, 2025 at 6:48 PM
Weather is beginning to look a lot like last year for #Astrophotography. But despite that, I was able to collect some data every now and then on the Rosette Nebula for a little mosaic, with my 130mm Newton. Stacked with DSS and combined with APP.
T Coronae Borealis is still staying calm. At least until now.
March 5, 2025 at 9:06 PM
T Coronae Borealis is still staying calm. At least until now.
Finally got my first #Astrophotography picture this year from Mars on the 29th. Seeing was far from perfect, but good enough for a small aperture. Also found out why my Camera was unwilling to take videos in my previous attempts. Much easier and less stressfull for the camera this way.
January 31, 2025 at 3:46 PM
Finally got my first #Astrophotography picture this year from Mars on the 29th. Seeing was far from perfect, but good enough for a small aperture. Also found out why my Camera was unwilling to take videos in my previous attempts. Much easier and less stressfull for the camera this way.
Had the opportunity to do a bit more #Astrophotography on the 25th. It was still early so a bit brighter than i would prefer, but still got a fair bit of data for the Horsehead Nebula.
January 27, 2025 at 6:26 PM
Had the opportunity to do a bit more #Astrophotography on the 25th. It was still early so a bit brighter than i would prefer, but still got a fair bit of data for the Horsehead Nebula.
And yet another older one from 2021. Globular cluster M22 in Sagittarius. Even though not quite as easy to view from more northern latitudes, it is quite an impressive target for #astrophotography even in challanging lighting conditions like full moon or inside cities because of its apparent size.
January 12, 2025 at 1:54 AM
And yet another older one from 2021. Globular cluster M22 in Sagittarius. Even though not quite as easy to view from more northern latitudes, it is quite an impressive target for #astrophotography even in challanging lighting conditions like full moon or inside cities because of its apparent size.