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.
Pinned
Image of M33 in the constellation Triangulum from ~August last year. It is always fascinating what an old DSLR can achieve with a bit of patience.
Of course a modern dedicated camera like a Asi 2600 is more efficient for #Astrophotography but at 5 to 6 times the price? Maybe a 2 GOTO mount instead?
Of course a modern dedicated camera like a Asi 2600 is more efficient for #Astrophotography but at 5 to 6 times the price? Maybe a 2 GOTO mount instead?
Its not everyday that #Astrophotography has to take a backseat for northern lights this intense in southern Germany. First time for me to see them bright enough to cast shadows.
January 20, 2026 at 12:31 AM
Its not everyday that #Astrophotography has to take a backseat for northern lights this intense in southern Germany. First time for me to see them bright enough to cast shadows.
Image of M33 in the constellation Triangulum from ~August last year. It is always fascinating what an old DSLR can achieve with a bit of patience.
Of course a modern dedicated camera like a Asi 2600 is more efficient for #Astrophotography but at 5 to 6 times the price? Maybe a 2 GOTO mount instead?
Of course a modern dedicated camera like a Asi 2600 is more efficient for #Astrophotography but at 5 to 6 times the price? Maybe a 2 GOTO mount instead?
January 18, 2026 at 8:34 PM
Image of M33 in the constellation Triangulum from ~August last year. It is always fascinating what an old DSLR can achieve with a bit of patience.
Of course a modern dedicated camera like a Asi 2600 is more efficient for #Astrophotography but at 5 to 6 times the price? Maybe a 2 GOTO mount instead?
Of course a modern dedicated camera like a Asi 2600 is more efficient for #Astrophotography but at 5 to 6 times the price? Maybe a 2 GOTO mount instead?
Finally had a short gap in the clouds a few days ago to capture the Great Red Spot on Jupiter. Imaged with my SW 130/650mm Newton and ZWO ASI 676 MC camera + 2x barlow.
#Astrophotography
#Astrophotography
January 11, 2026 at 7:38 PM
Finally had a short gap in the clouds a few days ago to capture the Great Red Spot on Jupiter. Imaged with my SW 130/650mm Newton and ZWO ASI 676 MC camera + 2x barlow.
#Astrophotography
#Astrophotography
The double cluster im Perseus (NGC 869 and 884), is a nice broadband target for #Astrophotography even when the Moon is out. I myself love the diffraction spikes caused by the secondary spider of Newton or RC telescopes for these types of targets. Imaged last year during a rare clear night in autumn
January 4, 2026 at 9:09 PM
The double cluster im Perseus (NGC 869 and 884), is a nice broadband target for #Astrophotography even when the Moon is out. I myself love the diffraction spikes caused by the secondary spider of Newton or RC telescopes for these types of targets. Imaged last year during a rare clear night in autumn
An other image from the same #Astrophotography night as the last image of Jupiter with Ganymede transit and the Io photobomb. Really have to try and get an other shot of Jupiter with its Red Spot visible, but somehow timing never seems to work out.
January 1, 2026 at 8:56 PM
An other image from the same #Astrophotography night as the last image of Jupiter with Ganymede transit and the Io photobomb. Really have to try and get an other shot of Jupiter with its Red Spot visible, but somehow timing never seems to work out.
Happy New Year everybody!
January 1, 2026 at 12:01 AM
Happy New Year everybody!
Weather overnight was clear for the first time in what feels like months. With seeing this good and a bright Moon out, Jupiter was the obvious target for #Astrophotography.
Despite the limited aperture of my 130mm Newton Ganymedes transit was easy to capture with Io squeezing into the frame too.
Despite the limited aperture of my 130mm Newton Ganymedes transit was easy to capture with Io squeezing into the frame too.
December 31, 2025 at 4:31 PM
Weather overnight was clear for the first time in what feels like months. With seeing this good and a bright Moon out, Jupiter was the obvious target for #Astrophotography.
Despite the limited aperture of my 130mm Newton Ganymedes transit was easy to capture with Io squeezing into the frame too.
Despite the limited aperture of my 130mm Newton Ganymedes transit was easy to capture with Io squeezing into the frame too.
Haven't seen a lot of posts about the Luminous Red Nova AT2025abao in M31 on here, so I thought I give it a try and 2 days ago weather cleared up just long enough to get a bit of #Astrophotography data. I was really surprised that it was visible even in single subs.
November 29, 2025 at 11:36 PM
Haven't seen a lot of posts about the Luminous Red Nova AT2025abao in M31 on here, so I thought I give it a try and 2 days ago weather cleared up just long enough to get a bit of #Astrophotography data. I was really surprised that it was visible even in single subs.
The Veil nebula in Cygnus imaged with my Samyang 135mm F2 lens. A great #Astrophotography target for Summer and early Autumn. Despite its distance of ~2500 lightyears, this supernova remnant just fit into the frame. Total exposure time about 2 hours.
November 12, 2025 at 7:49 PM
The Veil nebula in Cygnus imaged with my Samyang 135mm F2 lens. A great #Astrophotography target for Summer and early Autumn. Despite its distance of ~2500 lightyears, this supernova remnant just fit into the frame. Total exposure time about 2 hours.
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.
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).
Reposted by Jörg Altheimer
As the Milky Way band appears to pour into our ELT, the cranes around it seem to do the same while they further advance the telescope 🏗️ 🔭
Once complete, the ELT will be breaking down the light above in unparalleled detail.
More: https://www.eso.org/public/images/potw2533a/ 🧪
📷 C. Letelier/ESO
Once complete, the ELT will be breaking down the light above in unparalleled detail.
More: https://www.eso.org/public/images/potw2533a/ 🧪
📷 C. Letelier/ESO
August 18, 2025 at 7:02 AM
As the Milky Way band appears to pour into our ELT, the cranes around it seem to do the same while they further advance the telescope 🏗️ 🔭
Once complete, the ELT will be breaking down the light above in unparalleled detail.
More: https://www.eso.org/public/images/potw2533a/ 🧪
📷 C. Letelier/ESO
Once complete, the ELT will be breaking down the light above in unparalleled detail.
More: https://www.eso.org/public/images/potw2533a/ 🧪
📷 C. Letelier/ESO
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.
Reposted by Jörg Altheimer
Our VLT may have made intriguing discoveries in the surroundings of young stars:
➡️ A planet candidate inside a disc spiral (image 1)
➡️ A planet or brown dwarf candidate forming through gravitational instability (image 2)
https://www.eso.org/public/news/eso2513/
🔭 🧪
➡️ A planet candidate inside a disc spiral (image 1)
➡️ A planet or brown dwarf candidate forming through gravitational instability (image 2)
https://www.eso.org/public/news/eso2513/
🔭 🧪
July 21, 2025 at 12:03 PM
Our VLT may have made intriguing discoveries in the surroundings of young stars:
➡️ A planet candidate inside a disc spiral (image 1)
➡️ A planet or brown dwarf candidate forming through gravitational instability (image 2)
https://www.eso.org/public/news/eso2513/
🔭 🧪
➡️ A planet candidate inside a disc spiral (image 1)
➡️ A planet or brown dwarf candidate forming through gravitational instability (image 2)
https://www.eso.org/public/news/eso2513/
🔭 🧪