Ethan Teng
@citizenskies.com
Astrophotographer & amateur astronomer at 37.8 N. Telescope operator at Lick Observatory lickobservatory.org.
Join me on Mastodon: lookup.citizenskies.com.
🔭 William Optics Redcat 51 (250mm f/4.9)
🏔️ ZWO AM5
📸 Canon EOS 6D
🖼️ queerastro.space
🏳️🌈🏳️⚧️🇹🇼 he/him
Join me on Mastodon: lookup.citizenskies.com.
🔭 William Optics Redcat 51 (250mm f/4.9)
🏔️ ZWO AM5
📸 Canon EOS 6D
🖼️ queerastro.space
🏳️🌈🏳️⚧️🇹🇼 he/him
Saddened to hear of the damage to the 36" dome at Lick Observatory. It's unknown how this will impact our public programs in the spring, but I'm just glad no one was hurt and that the historic telescope itself doesn't seem to have been damaged.
news.ucsc.edu/2025/12/hist...
news.ucsc.edu/2025/12/hist...
December 27, 2025 at 7:27 PM
Saddened to hear of the damage to the 36" dome at Lick Observatory. It's unknown how this will impact our public programs in the spring, but I'm just glad no one was hurt and that the historic telescope itself doesn't seem to have been damaged.
news.ucsc.edu/2025/12/hist...
news.ucsc.edu/2025/12/hist...
Penultimate image from my 2024 dark sky observing trip: the California Nebula. And by golly, it really does look like California! 😆
1h 6' integration time, stacked using Siril and lightly processed with Adobe Photoshop & Lightroom.
#astronomy #astrophotography #astro #siril #photoshop #lightroom
1h 6' integration time, stacked using Siril and lightly processed with Adobe Photoshop & Lightroom.
#astronomy #astrophotography #astro #siril #photoshop #lightroom
December 15, 2025 at 8:32 PM
Penultimate image from my 2024 dark sky observing trip: the California Nebula. And by golly, it really does look like California! 😆
1h 6' integration time, stacked using Siril and lightly processed with Adobe Photoshop & Lightroom.
#astronomy #astrophotography #astro #siril #photoshop #lightroom
1h 6' integration time, stacked using Siril and lightly processed with Adobe Photoshop & Lightroom.
#astronomy #astrophotography #astro #siril #photoshop #lightroom
Look up! It's the Andromeda Galaxy coming directly for us! ETA 4.5 billion years 👀
From the 2nd night of my 2024 observing trip to the Sierra Nevada mountains. Only 51' integration time because brr it was cold 🥶
#astronomy #astrophotography #andromeda
From the 2nd night of my 2024 observing trip to the Sierra Nevada mountains. Only 51' integration time because brr it was cold 🥶
#astronomy #astrophotography #andromeda
December 14, 2025 at 8:28 PM
Look up! It's the Andromeda Galaxy coming directly for us! ETA 4.5 billion years 👀
From the 2nd night of my 2024 observing trip to the Sierra Nevada mountains. Only 51' integration time because brr it was cold 🥶
#astronomy #astrophotography #andromeda
From the 2nd night of my 2024 observing trip to the Sierra Nevada mountains. Only 51' integration time because brr it was cold 🥶
#astronomy #astrophotography #andromeda
Well this is kind of wild. I hadn’t checked my stats on @unsplash.com in months. And suddenly I’m in the top 25% of contributors?? Top 10% in the last 30 days! 🤯
#astrophotography #astronomy #unsplash
#astrophotography #astronomy #unsplash
December 12, 2025 at 1:59 AM
Well this is kind of wild. I hadn’t checked my stats on @unsplash.com in months. And suddenly I’m in the top 25% of contributors?? Top 10% in the last 30 days! 🤯
#astrophotography #astronomy #unsplash
#astrophotography #astronomy #unsplash
More from my 2024 dark sky trip...
Here's the Eagle Nebula (M16) & Omega Nebula (M17). 1h 51′ total integration time. Taken with my Redcat 51 & Canon DLSR on a VERY cold night high in the Sierra Nevadas 🏔️
If you squint - or zoom - you'll see the Pillars of Creation.
#astrophotography #astronomy
Here's the Eagle Nebula (M16) & Omega Nebula (M17). 1h 51′ total integration time. Taken with my Redcat 51 & Canon DLSR on a VERY cold night high in the Sierra Nevadas 🏔️
If you squint - or zoom - you'll see the Pillars of Creation.
#astrophotography #astronomy
December 12, 2025 at 1:22 AM
More from my 2024 dark sky trip...
Here's the Eagle Nebula (M16) & Omega Nebula (M17). 1h 51′ total integration time. Taken with my Redcat 51 & Canon DLSR on a VERY cold night high in the Sierra Nevadas 🏔️
If you squint - or zoom - you'll see the Pillars of Creation.
#astrophotography #astronomy
Here's the Eagle Nebula (M16) & Omega Nebula (M17). 1h 51′ total integration time. Taken with my Redcat 51 & Canon DLSR on a VERY cold night high in the Sierra Nevadas 🏔️
If you squint - or zoom - you'll see the Pillars of Creation.
#astrophotography #astronomy
More from my 2024 dark sky trip...
North America Nebula (NGC 7000) & Pelican Nebula (IC 5070). Prior to this, I had never captured the Pelican in its entirety in a single photo. But thanks to the huge FOV on the Redcat 51, I see it really does look like a giant bird!
#astronomy #astrophotography
North America Nebula (NGC 7000) & Pelican Nebula (IC 5070). Prior to this, I had never captured the Pelican in its entirety in a single photo. But thanks to the huge FOV on the Redcat 51, I see it really does look like a giant bird!
#astronomy #astrophotography
December 10, 2025 at 5:54 PM
More from my 2024 dark sky trip...
North America Nebula (NGC 7000) & Pelican Nebula (IC 5070). Prior to this, I had never captured the Pelican in its entirety in a single photo. But thanks to the huge FOV on the Redcat 51, I see it really does look like a giant bird!
#astronomy #astrophotography
North America Nebula (NGC 7000) & Pelican Nebula (IC 5070). Prior to this, I had never captured the Pelican in its entirety in a single photo. But thanks to the huge FOV on the Redcat 51, I see it really does look like a giant bird!
#astronomy #astrophotography
Resharing images from my September 2024 dark sky observing trip to the Sierra Nevadas.
First up: the Lagoon (M8) & Trifid (M20) Nebulas. 2h 9' total integration time with my Redcat 51 & Canon DSLR camera mounted on ZWO AM5.
#astrophotography #astronomy
First up: the Lagoon (M8) & Trifid (M20) Nebulas. 2h 9' total integration time with my Redcat 51 & Canon DSLR camera mounted on ZWO AM5.
#astrophotography #astronomy
December 10, 2025 at 4:29 AM
Resharing images from my September 2024 dark sky observing trip to the Sierra Nevadas.
First up: the Lagoon (M8) & Trifid (M20) Nebulas. 2h 9' total integration time with my Redcat 51 & Canon DSLR camera mounted on ZWO AM5.
#astrophotography #astronomy
First up: the Lagoon (M8) & Trifid (M20) Nebulas. 2h 9' total integration time with my Redcat 51 & Canon DSLR camera mounted on ZWO AM5.
#astrophotography #astronomy
Excited to be making the space nerd pilgrimage: catching the midnight showing of Interstellar being re-released in IMAX 🍿🥤🚀🪐
Half the theater look like they weren’t born yet when the movie first came out but nevertheless so excited for this!
Half the theater look like they weren’t born yet when the movie first came out but nevertheless so excited for this!
December 14, 2024 at 6:54 AM
Excited to be making the space nerd pilgrimage: catching the midnight showing of Interstellar being re-released in IMAX 🍿🥤🚀🪐
Half the theater look like they weren’t born yet when the movie first came out but nevertheless so excited for this!
Half the theater look like they weren’t born yet when the movie first came out but nevertheless so excited for this!
Done! And I reported and blocked a couple more 🫠
November 20, 2024 at 3:28 PM
Done! And I reported and blocked a couple more 🫠
I’m OFFICIAL y’all!
Well actually I’ve been official for a few months now but this seals the deal 😂
Loving my gig at Lick Observatory! Come by for a tour & view through the Great 36” Lick Refractor before we close up for winter 🔭
Well actually I’ve been official for a few months now but this seals the deal 😂
Loving my gig at Lick Observatory! Come by for a tour & view through the Great 36” Lick Refractor before we close up for winter 🔭
September 29, 2024 at 1:52 AM
I’m OFFICIAL y’all!
Well actually I’ve been official for a few months now but this seals the deal 😂
Loving my gig at Lick Observatory! Come by for a tour & view through the Great 36” Lick Refractor before we close up for winter 🔭
Well actually I’ve been official for a few months now but this seals the deal 😂
Loving my gig at Lick Observatory! Come by for a tour & view through the Great 36” Lick Refractor before we close up for winter 🔭
I’ve set up a retail shop for my #astrophotography!
If you’re in the market for some fun astronomy-themed phone cases, notebooks, and more, check out queerastro.space 🔭
I plan to keep adding more to it over time. Next up: tote bags!
Thanks for your support! 🏳️🌈
If you’re in the market for some fun astronomy-themed phone cases, notebooks, and more, check out queerastro.space 🔭
I plan to keep adding more to it over time. Next up: tote bags!
Thanks for your support! 🏳️🌈
September 28, 2024 at 8:15 PM
I’ve set up a retail shop for my #astrophotography!
If you’re in the market for some fun astronomy-themed phone cases, notebooks, and more, check out queerastro.space 🔭
I plan to keep adding more to it over time. Next up: tote bags!
Thanks for your support! 🏳️🌈
If you’re in the market for some fun astronomy-themed phone cases, notebooks, and more, check out queerastro.space 🔭
I plan to keep adding more to it over time. Next up: tote bags!
Thanks for your support! 🏳️🌈
Nice! Here’s my recent go at this one from just a couple of weeks ago.
September 24, 2024 at 1:36 AM
Nice! Here’s my recent go at this one from just a couple of weeks ago.
Bluesky now has over 10 million users, and I was #4,699,061!
September 18, 2024 at 8:25 PM
Bluesky now has over 10 million users, and I was #4,699,061!
I just launched my new website! 💥
Check out queerastro.space for all my astronomy & #astrophotography related stuff 🔭
It’s just my photography portfolio for now but I plan to add a #citizenscience section soon 🧪
Check out queerastro.space for all my astronomy & #astrophotography related stuff 🔭
It’s just my photography portfolio for now but I plan to add a #citizenscience section soon 🧪
September 16, 2024 at 3:23 PM
I just launched my new website! 💥
Check out queerastro.space for all my astronomy & #astrophotography related stuff 🔭
It’s just my photography portfolio for now but I plan to add a #citizenscience section soon 🧪
Check out queerastro.space for all my astronomy & #astrophotography related stuff 🔭
It’s just my photography portfolio for now but I plan to add a #citizenscience section soon 🧪
In honor of the 25th anniversary of the first ever detection of a transiting exoplanet HD 209458b, here is my direct observation of another exoplanet transit TOI-1259 Ab...
...captured from my backyard with a commercially available telescope (Unistellar eQuinox) 🔭🧪
en.wikipedia.org/wiki/HD_2094...
...captured from my backyard with a commercially available telescope (Unistellar eQuinox) 🔭🧪
en.wikipedia.org/wiki/HD_2094...
September 10, 2024 at 2:00 AM
In honor of the 25th anniversary of the first ever detection of a transiting exoplanet HD 209458b, here is my direct observation of another exoplanet transit TOI-1259 Ab...
...captured from my backyard with a commercially available telescope (Unistellar eQuinox) 🔭🧪
en.wikipedia.org/wiki/HD_2094...
...captured from my backyard with a commercially available telescope (Unistellar eQuinox) 🔭🧪
en.wikipedia.org/wiki/HD_2094...
12/🧵
All in all, it was a super productive & enjoyable trip ⛰️😅
Many thanks to the staff of Barcroft Station for making our stay so enjoyable ❤️
www.wmrc.edu/barcroft-sta...
And shout out to East Bay Astronomical Society for organizing the trip. I can’t wait to go back next year! 🌌🔭
All in all, it was a super productive & enjoyable trip ⛰️😅
Many thanks to the staff of Barcroft Station for making our stay so enjoyable ❤️
www.wmrc.edu/barcroft-sta...
And shout out to East Bay Astronomical Society for organizing the trip. I can’t wait to go back next year! 🌌🔭
September 7, 2024 at 4:21 AM
12/🧵
All in all, it was a super productive & enjoyable trip ⛰️😅
Many thanks to the staff of Barcroft Station for making our stay so enjoyable ❤️
www.wmrc.edu/barcroft-sta...
And shout out to East Bay Astronomical Society for organizing the trip. I can’t wait to go back next year! 🌌🔭
All in all, it was a super productive & enjoyable trip ⛰️😅
Many thanks to the staff of Barcroft Station for making our stay so enjoyable ❤️
www.wmrc.edu/barcroft-sta...
And shout out to East Bay Astronomical Society for organizing the trip. I can’t wait to go back next year! 🌌🔭
11/🧵
Lastly, I did some #solar observing with my Unistellar scope. Here’s a short animation of multiple sunspot clusters over the course of 5 hours on Tuesday September 3, 2024. I took 1 image per hour. As you can see, there was lots of activity that day! 🔭🧪 #astronomy
Lastly, I did some #solar observing with my Unistellar scope. Here’s a short animation of multiple sunspot clusters over the course of 5 hours on Tuesday September 3, 2024. I took 1 image per hour. As you can see, there was lots of activity that day! 🔭🧪 #astronomy
September 7, 2024 at 4:19 AM
11/🧵
Lastly, I did some #solar observing with my Unistellar scope. Here’s a short animation of multiple sunspot clusters over the course of 5 hours on Tuesday September 3, 2024. I took 1 image per hour. As you can see, there was lots of activity that day! 🔭🧪 #astronomy
Lastly, I did some #solar observing with my Unistellar scope. Here’s a short animation of multiple sunspot clusters over the course of 5 hours on Tuesday September 3, 2024. I took 1 image per hour. As you can see, there was lots of activity that day! 🔭🧪 #astronomy
10/🧵
I also collected data on a new #supernova: ZTF24abejmqz. It was first detected just a few days ago on September 1, 2024 in the constellation Cepheus 🎆
I was able to measure its magnitude at 12.29 +/- 0.07. 🔭🧪
#astronomy #citizenscience
I also collected data on a new #supernova: ZTF24abejmqz. It was first detected just a few days ago on September 1, 2024 in the constellation Cepheus 🎆
I was able to measure its magnitude at 12.29 +/- 0.07. 🔭🧪
#astronomy #citizenscience
September 7, 2024 at 4:18 AM
10/🧵
I also collected data on a new #supernova: ZTF24abejmqz. It was first detected just a few days ago on September 1, 2024 in the constellation Cepheus 🎆
I was able to measure its magnitude at 12.29 +/- 0.07. 🔭🧪
#astronomy #citizenscience
I also collected data on a new #supernova: ZTF24abejmqz. It was first detected just a few days ago on September 1, 2024 in the constellation Cepheus 🎆
I was able to measure its magnitude at 12.29 +/- 0.07. 🔭🧪
#astronomy #citizenscience
9/🧵
I also had the opportunity to do a bit of #citizenscience with my other telescope, the Unistellar eQuinox. I captured the transit of exoplanet TOI-1259 Ab, a 0.441 Jupiters gas giant discovered in 2021. 🔭🧪 #astronomy #exoplanets
I also had the opportunity to do a bit of #citizenscience with my other telescope, the Unistellar eQuinox. I captured the transit of exoplanet TOI-1259 Ab, a 0.441 Jupiters gas giant discovered in 2021. 🔭🧪 #astronomy #exoplanets
September 7, 2024 at 4:17 AM
9/🧵
I also had the opportunity to do a bit of #citizenscience with my other telescope, the Unistellar eQuinox. I captured the transit of exoplanet TOI-1259 Ab, a 0.441 Jupiters gas giant discovered in 2021. 🔭🧪 #astronomy #exoplanets
I also had the opportunity to do a bit of #citizenscience with my other telescope, the Unistellar eQuinox. I captured the transit of exoplanet TOI-1259 Ab, a 0.441 Jupiters gas giant discovered in 2021. 🔭🧪 #astronomy #exoplanets
7/🧵 [DAY 2]
Orion Nebula (M42), Horsehead Nebula (Barnard 33), Flame Nebula (NGC 2024). 36′ integration time. 🔭 #astrophotography
www.astrobin.com/2q9zhs/
Orion Nebula (M42), Horsehead Nebula (Barnard 33), Flame Nebula (NGC 2024). 36′ integration time. 🔭 #astrophotography
www.astrobin.com/2q9zhs/
September 7, 2024 at 4:16 AM
7/🧵 [DAY 2]
Orion Nebula (M42), Horsehead Nebula (Barnard 33), Flame Nebula (NGC 2024). 36′ integration time. 🔭 #astrophotography
www.astrobin.com/2q9zhs/
Orion Nebula (M42), Horsehead Nebula (Barnard 33), Flame Nebula (NGC 2024). 36′ integration time. 🔭 #astrophotography
www.astrobin.com/2q9zhs/
6/🧵 [DAY 2]
California Nebula (NGC 1499). 1h 6′ integration time. 🔭 #astrophotography
www.astrobin.com/p0ofdh/
California Nebula (NGC 1499). 1h 6′ integration time. 🔭 #astrophotography
www.astrobin.com/p0ofdh/
September 7, 2024 at 4:15 AM
6/🧵 [DAY 2]
California Nebula (NGC 1499). 1h 6′ integration time. 🔭 #astrophotography
www.astrobin.com/p0ofdh/
California Nebula (NGC 1499). 1h 6′ integration time. 🔭 #astrophotography
www.astrobin.com/p0ofdh/
5/🧵 [DAY 2]
Andromeda Galaxy (M31). 51′ integration time. 🔭 #astrophotography
www.astrobin.com/7ouuod/
Andromeda Galaxy (M31). 51′ integration time. 🔭 #astrophotography
www.astrobin.com/7ouuod/
September 7, 2024 at 4:14 AM
5/🧵 [DAY 2]
Andromeda Galaxy (M31). 51′ integration time. 🔭 #astrophotography
www.astrobin.com/7ouuod/
Andromeda Galaxy (M31). 51′ integration time. 🔭 #astrophotography
www.astrobin.com/7ouuod/
4/🧵 [DAY 2]
Eagle Nebula (M16) & Omega Nebula (M17). 1h 51′ integration time. 🔭 #astrophotography
www.astrobin.com/1zm7fm/
Eagle Nebula (M16) & Omega Nebula (M17). 1h 51′ integration time. 🔭 #astrophotography
www.astrobin.com/1zm7fm/
September 7, 2024 at 4:13 AM
4/🧵 [DAY 2]
Eagle Nebula (M16) & Omega Nebula (M17). 1h 51′ integration time. 🔭 #astrophotography
www.astrobin.com/1zm7fm/
Eagle Nebula (M16) & Omega Nebula (M17). 1h 51′ integration time. 🔭 #astrophotography
www.astrobin.com/1zm7fm/
3/🧵 [DAY 1]
North America Nebula (NGC 7000) & Pelican Nebula (IC 5070). 1h 45′ integration time. 🔭 #astrophotography
www.astrobin.com/6k2ny5/
North America Nebula (NGC 7000) & Pelican Nebula (IC 5070). 1h 45′ integration time. 🔭 #astrophotography
www.astrobin.com/6k2ny5/
September 7, 2024 at 4:12 AM
3/🧵 [DAY 1]
North America Nebula (NGC 7000) & Pelican Nebula (IC 5070). 1h 45′ integration time. 🔭 #astrophotography
www.astrobin.com/6k2ny5/
North America Nebula (NGC 7000) & Pelican Nebula (IC 5070). 1h 45′ integration time. 🔭 #astrophotography
www.astrobin.com/6k2ny5/