Astronomy ChatroomAre we able to notice changes in far-away deep sky objects like a nebula or a galaxy?
There is one question I ponder about since I started with astrophotography: I know I am looking way back in time. I am sure the deep sky objects change all the time. A nebula expands at certain speeds, a star is moving along, material is moving or hit by something else, objects might interact, etc. . So when are we able to notice changes in light-years-away deep sky objects like a nebula or a galaxy? When I take a long-term exposure of an object and repeat the same shot a year or more later, shouldn't there be a small noticeable difference? Or not because the target is light-years away and appears so small when observed from the earth? If I combine long-term exposures taken every year to a single image I think I am falsifying the object somehow. Or is it simply not possible to detect seemingly small changes with the technical tools available for the moment? Or could it be the distant targets movements are way to small to be detectable by any observer on earth?
Astro Encyclopedia2 special stars in the gemini constellation.
Castor and Pollux, known as the Dioscuri, are heroic twin brothers from Greek mythology, sons of Leda, famous for their inseparable bond, bravery, and exploits with Jason and the Argonauts and the Calydonian Boar Hunt; they became the constellation Gemini after Pollux shared his immortality with the mortal Castor, allowing them to spend half their time in the underworld and half in the heavens, symbolizing protection for sailors and warriors. #Castor and Pollux #
Seestar Official GroupIn how cold have you used your seestar?
So, in how cold have you used and has there been any problems, breaking plastic etc. I,ve been using couple of times in about -17'C with powerbank for about 4-5 hours without any problems. I know manual says that -10'c the limit
Seestar Official GroupUsing Seestar for photometry - my problem
Hello! Has anyone used Seestar for photometry? I tried and then I wanted to perform transformation from Seestar "photometric system" to Johnson-Cousins, I even wrote a program for it. But when I wanted to "split" Seestar data for data in Seestar's R, G and B filters in Muniwin and performed photometry (instrumental magnitudes) I received the same lightcurve for each filter... Brightness in R was the same as in G and B... Maybe if it is impossible to distinguish these Seestar's "filters"? But I could do exact same process for my Canon R7... I don't know where is the problem :(
Stargazers SocialHow things have changed for our kind of people!
I'm getting up there in years (67 this Sunday😊 ). I've loved astronomy since I was a kid. First telescope was a 4 inch Newtonian at age 10. It was pretty fancy. It had an EQ mount and even slow motion knobs. My dream some day was to get what we called at the time a "clock drive" so I wouldn't need to always be turning knobs to keep the target in the eyepiece! Astrophotography was film only, so forget about it for someone like me! 😂 Fast forward to today where my 14 inch RC guides a digital camera perfectly and even focuses itself and automatically flips and reacquires the target after it passes the local meridian. I take astrophotos now like I only saw in books back in the day! What a marvelous time to be an amateur astronomer! Enjoy it!
Seestar Official GroupWhat do you think about next Seestar model?
It's interesting to know your guesses about what the next model in the Seestar line will be.
Seestar Official GroupHey apollo, got a question| WDYM TITLE SHOULD BE NO LESS THAN 30 CHARACTERS
@Apollo would you be capable of reopen your shop when i would be ready to command ? Wanted to buy all but had some little money issues LOL this is your shop btw Fenufebfeyd
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Question List
1望远镜的目镜选择？
2如何在城市里（六级区）出摊打野拍深空？而且新购入的设备总价不超过一万？
3Pixinsight - is it worth it ? How is the learning curve ?
4Sun Guardian Badge - best tips?
5Help with the Moon Phase Tracker?
6What are y’all’s favorite deep sky objects?
7Sirius Warrior - new badge / new questions !?
8Who’s going to AstroCon2025 at Bryce Canyon?
Thought List
1whitch tools do you use in siril for processing?
23iatlas how can I see from Scotland next
3我有一个手搓的折反望远镜，口径117mm，焦距900mm，可以拍什么？
4Seestar S50 advert -fan made .......
5Lego made solar finder
6关于超级蓝月亮，全面的问题解答(Super Blue Moons: Your Questions Answered)
7Sirius Warrior Acquisition Group (SWAG)
8关于月食的一切，类型、图像以及发生的频率。
9Comparison of S30 v S50 Rosette Nebula
10Nice garbage container always polar aligned containers on wheels Pull and close up.