How Do You Observe M32?
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Re: How Do You Observe M32?
Regards
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Re: How Do You Observe M32?
However, looking through an eyepiece, you will see a slightly fuzzy star a surprisingly long distance from M31's core. This is a photograph, of course, but I deliberately processed it to resemble what I could see with a low-powered eyepiece under
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Re: How Do You Observe M32?
In wide field views M32 has often been illusive unless I have very good transparency. Kathryn's representative image is an excellent illustration of my usual wide field view. I probably viewed M31 a half dozen times before I understood the relative positions and identified M32 in visual observation.
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Re: How Do You Observe M32?
From my typical suburban back yard, M32 is always visible, even on the worst nights, while M110 might be invisible during nights of particularly poor transparency. I liken M32 to a small unresolved globular cluster in appearance. From our dark site, the experience is a little different however. The outer structure of M31 extends much farther out because of the lack of
The main thing to remember is to look for the star patterns as depicted in your Stellarium screen capture and triangulate M32 using them. M32 will not appear stellar, rather as a diffuse fuzzy star or as I said a small globular cluster that will not resolve. See my annotated version of your image below. As a bonus I also indicated the brightest star cloud in M31,
Good luck, and rest assured you should definitely see it, and in all likelihood, have done so unbeknownst to you.
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Re: How Do You Observe M32?
Man... That's some icky-tasting stuff!
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Re: How Do You Observe M32?
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Re: How Do You Observe M32?
As Kathy mentioned above, you are probably looking too close to the core of M31. I was not sure many times as well until I viewed a drawing of M31 and M32. Visually, it almost appears as far from the core as M110 does on the other side. Once you realize it's not "in" the nebulosity of M31 like it appears in most photos, she is very easy to spot.Refractordude wrote: ↑Thu Oct 15, 2020 6:00 am I tried spotting M32 within Andromeda at the 10, 11, and 12 o'clock positions, but no luck. I used my 40mm plossl for a wider exit pupil, but no luck. Andromeda was a little more then 2 degrees wide. I have seen it wider and brighter at Maryland's Point Lookout State park, which is a 10 minutes drive away. It could have been the atmosphere, because Mars showed less detail than I cold see under my home bartle 9 skies. Still had a good time.
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Re: How Do You Observe M32?
Easily seen as small disc through the binoculars as small as 10.5x70 under
Clear skies,
JG
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Re: How Do You Observe M32?
I think you are right about the atmospheric conditions at the seashore. I tried observing from the Outer Banks under what looked like pretty clear skies but resolution was pretty terrible each time.Refractordude wrote: ↑Thu Oct 15, 2020 6:00 am ... I tried spotting M32 within Andromeda at the 10, 11, and 12 o'clock positions, but no luck. I used my 40mm plossl for a wider exit pupil, but no luck. Andromeda was a little more then 2 degrees wide. I have seen it wider and brighter at Maryland's Point Lookout State park, which is a 10 minutes drive away. It could have been the atmosphere, because Mars showed less detail than I cold see under my home bartle 9 skies. Still had a good time.
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Re: How Do You Observe M32?
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Re: How Do You Observe M32?
This may surprise you, but it is probably among the 5 brightest galaxies in the whole sky. It is visible in skies where M81/82 and M104 are invisible.
It's all about expectations--it is a small spherical galaxy, and that is probably why it was difficult to find or see.
It is bright enough I can view it at 500x, a magnification where most other galaxies have been dimmed to invisibility.
Once you find it, and identify it, you will never have any problem seeing it again.
Currently using a 12.5" dob and a 4" apo refractor
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Re: How Do You Observe M32?
I don't really understand why Surface Brightness might be more important than apparent magnitude.
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Re: How Do You Observe M32?
The apparent magnitude is what the magnitude would be, if all the light from the surface was coming from a point.
Or, surface magnitude is (roughly) apparent magnitude (or rather, the flux) spread all over the surface (evenly).
Neither of them gives a very good indication of how bright it would appear to you, because neither takes into account the
"spread function" of the light. Looking at both AND the apparent size of the object gives you some kind of idea.
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Re: How Do You Observe M32?
Thanks. That does make sense. I'll try to compare a few objects on my next clear night and see if I can get a better feel for the difference.turboscrew wrote: ↑Sat Jun 12, 2021 10:16 amThe apparent magnitude is what the magnitude would be, if all the light from the surface was coming from a point.
Or, surface magnitude is (roughly) apparent magnitude (or rather, the flux) spread all over the surface (evenly).
Neither of them gives a very good indication of how bright it would appear to you, because neither takes into account the
"spread function" of the light. Looking at both AND the apparent size of the object gives you some kind of idea.
Clear skies!
Gary C
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Re: How Do You Observe M32?
That is: a star of magnitude 3 is about 2.7 times brighter (in terms of flux) than a magnitude 4 star.
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Re: How Do You Observe M32?
Gary C
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Re: How Do You Observe M32?
Yes. My understanding is that the 2.7 comes from the dynamics of the human eye. Most human senses go with about 2.5 exponent, but for eye the base is 2.7. That is: if the flux of B is 2.7 x flux of A, and flux of C is 2.7 x flux of B (= 2.7 x 2.7 x flux of A), the brightness difference between A and B looks as big as the brightness difference between B and C.
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Re: How Do You Observe M32?
turboscrew wrote: ↑Sat Jun 12, 2021 12:48 pmYes. My understanding is that the 2.7 comes from the dynamics of the human eye. Most human senses go with about 2.5 exponent, but for eye the base is 2.7.
In other words it follows a natural logarithmic scale.
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Re: How Do You Observe M32?
Oops! Double checked! I remembered wrong. The base for visual magnitude is about 2.5! Not about 2.7.GCoyote wrote: ↑Sat Jun 12, 2021 12:51 pmturboscrew wrote: ↑Sat Jun 12, 2021 12:48 pmYes. My understanding is that the 2.7 comes from the dynamics of the human eye. Most human senses go with about 2.5 exponent, but for eye the base is 2.7.
In other words it follows a natural logarithmic scale.
(Actually the base is defined to be 5th root of 100.)
I guess I have to check a bunch of other stuff as well. My memory seems to have done a major sommersault here.
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