Date   

Re: The Ghostly nebula

Kent Blackwell
 

I'm marking that down to look at on October 31.


Re: Planetary Nebula Central Stars

Kent Blackwell
 

It's interesting that atmospheric seeing makes a huge difference is detecting the central stars in PnE. Probably because the magnification can be pushed to the absolute limit. 


Re: Planetary Nebula Central Stars

Ted Forte
 

Great observation Kent. 

 

Conventional wisdom has it that seeing is the limiting factor in detecting the central stars of certain PNe and I have no reason to suspect otherwise.  When the central star is similar in brightness to the central area of the PN, it takes steady seeing to detect it. I know from ample literature that is the case with the Ring Nebula.  There are far fewer scholarly discussions on the visibility of the central stars in the Saturn Nebula and NGC 6891 but I strongly suspect that the situation is similar.  Surface brightness values can be misleading as they are an average over the entire body and they do not account for variations across the body.  I believe the brightness of M57’s central star is only about .1 or .2 magnitudes brighter than the surrounding nebulosity.

 

Anyway, I can also attest to the difficulty in detecting the central stars of all three PNe that Kent mentions here. My logs contain 17 descriptions of NGC 6891 and 6 of them report detecting the central star. I’ve described NGC 7009 in my logs 62 times and mention the central star being  visible in only 5 of them.  Suffice it to say, that I’ve seen the central star in M57 a small number of times in relation to the 382 descriptions I’ve recorded – I’m just not going to read through them all to count!

 

It is unfortunate however, that like many observers, I don’t always mention negative attempts to see the CSPN, so I can only guess at whether I actually considered the visibility of the central star for any particular instance where it is not specified. That is sometimes I’ve specifically said that the central star was not visible and other times, its just not mentioned in my notes.

 

Ted

 

From: BackBayAstro@groups.io <BackBayAstro@groups.io> On Behalf Of Kent Blackwell
Sent: Saturday, September 4, 2021 5:09 AM
To: BackBayAstro@groups.io
Subject: [BackBayAstro] Planetary Nebula Central Stars

 

Last night I tried my hand at seeing a central stars in a few planetary nebulae. The most challenging is the central star in M 57, The Ring Nebula. I could count the times in one hand I've seen it in 50 years. Using my 25" I was not able to see it with a 16mm Nagler (200x), nor could I see it bumping the power up to 635x with a Pentax 5mm. Finally using a 7mm Pentax at 435x I saw it for one fleeting second, then again; quickly disappearing as fast as it appeared.

Almost as challenging is the central star in NGC 7009, The Saturn Nebula. This time it popped into view using a 3.5mm Pentax, at a whopping 907x.

Lastly was the very blue central star in NGC 6891 in Sagittarius. It's small so I had to once again use the 3.5mm Pentax at 907x. It reminds me of the above Saturn Nebula, being slightly flattened.


Planetary Nebula Central Stars

Kent Blackwell
 

Last night I tried my hand at seeing a central stars in a few planetary nebulae. The most challenging is the central star in M 57, The Ring Nebula. I could count the times in one hand I've seen it in 50 years. Using my 25" I was not able to see it with a 16mm Nagler (200x), nor could I see it bumping the power up to 635x with a Pentax 5mm. Finally using a 7mm Pentax at 435x I saw it for one fleeting second, then again; quickly disappearing as fast as it appeared.
Almost as challenging is the central star in NGC 7009, The Saturn Nebula. This time it popped into view using a 3.5mm Pentax, at a whopping 907x.
Lastly was the very blue central star in NGC 6891 in Sagittarius. It's small so I had to once again use the 3.5mm Pentax at 907x. It reminds me of the above Saturn Nebula, being slightly flattened.


Re: The Ghostly nebula

Roy Diffrient
 

Spooktacular!

Roy


On Sep 3, 2021, at 7:28 PM, Ian Stewart <swampcolliecoffee@...> wrote:

A quick closeup shot of IC63 from last night. Definitely has that ghostly feel.
Cheers
Ian
IC63


Re: The Ghostly nebula

jimcoble2000
 

very nice. Iike that one

On Friday, September 3, 2021, 07:28:08 PM EDT, Ian Stewart <swampcolliecoffee@...> wrote:


A quick closeup shot of IC63 from last night. Definitely has that ghostly feel.
Cheers
Ian
IC63


The Ghostly nebula

Ian Stewart
 

A quick closeup shot of IC63 from last night. Definitely has that ghostly feel.
Cheers
Ian
IC63


Re: Cornwatch 9/3/21

Gabriel Dandrade
 

The weather looks good. I’ll be there. If anyone else wants to come they’re welcome


Re: BBAA September 2 Meeting ZOOM Recording

William Rust
 

Here, Here!
Jeff, do y still want to do a presentation next month?


From: BackBayAstro@groups.io <BackBayAstro@groups.io> on behalf of Jeff Goldstein <jeffgold1@...>
Sent: Friday, September 3, 2021 4:52 PM
To: BackBayAstro@groups.io <BackBayAstro@groups.io>; VPAS@groups.io <VPAS@groups.io>
Subject: [BackBayAstro] BBAA September 2 Meeting ZOOM Recording
 

Topic: BBAA

Start Time : Sep 2, 2021 07:13 PM

Excellent Presentation by George Reynolds’ DVD Astronomy Facts from 2006

 

 

Meeting Recording:

https://vccs.zoom.us/rec/share/m0hhP0gwEgHvOj9RU397ZolHLc8JUWRaBgA7XTp75ezFBkG-JX7ScsOSnqEtKw5L.ea6vIDkr6kQDJpV2

 

Access Passcode: BBAA_9-02

 

Enjoy!

 

Jeff G.

 


BBAA September 2 Meeting ZOOM Recording

Jeff Goldstein
 

Topic: BBAA

Start Time : Sep 2, 2021 07:13 PM

Excellent Presentation by George Reynolds’ DVD Astronomy Facts from 2006

 

 

Meeting Recording:

https://vccs.zoom.us/rec/share/m0hhP0gwEgHvOj9RU397ZolHLc8JUWRaBgA7XTp75ezFBkG-JX7ScsOSnqEtKw5L.ea6vIDkr6kQDJpV2

 

Access Passcode: BBAA_9-02

 

Enjoy!

 

Jeff G.

 


Cornwatch 9/3/21

Gabriel Dandrade
 

Anyone planning on going to Cornland park tonight?
Weather’s looking great.

Thanks,
Gabriel D.


Re: Patterson Observatory (Sierra Vista AZ)

Matthew Cook
 

Technology is so cool sometimes!


On Sep 3, 2021, at 10:24, Ted Forte <tedforte511@...> wrote:



The camera is pretty cool.  You position it and get out of it’s field of view. It’s controlled by a computer tablet.  The camera exposes while rotating 360 degrees , when it’s done  the result shows up on the tablet and you can accept it or not.  For the next image , the software will report on the overlap and reject the image if it’s insufficient.  It took a little under two hours to record.   

 

 

 

<image003.jpg>

 

From: BackBayAstro@groups.io <BackBayAstro@groups.io> On Behalf Of Kent Blackwell
Sent: Friday, September 3, 2021 6:05 AM
To: BackBayAstro@groups.io
Subject: Re: [BackBayAstro] Patterson Observatory (Sierra Vista AZ)

 

The Patterson Observatory looks fantastic. Great tour, too.


Re: Patterson Observatory (Sierra Vista AZ)

Ted Forte
 

The camera is pretty cool.  You position it and get out of it’s field of view. It’s controlled by a computer tablet.  The camera exposes while rotating 360 degrees , when it’s done  the result shows up on the tablet and you can accept it or not.  For the next image , the software will report on the overlap and reject the image if it’s insufficient.  It took a little under two hours to record.   

 

 

 

 

From: BackBayAstro@groups.io <BackBayAstro@groups.io> On Behalf Of Kent Blackwell
Sent: Friday, September 3, 2021 6:05 AM
To: BackBayAstro@groups.io
Subject: Re: [BackBayAstro] Patterson Observatory (Sierra Vista AZ)

 

The Patterson Observatory looks fantastic. Great tour, too.


Re: City observing with a 25"

jimcoble2000
 

It will be interesting to see how seeing develops over the next few days. It certainly was a good night with very low light scatter due to the exceptional clean air. It was noticeably darker in the back yard. If I recall that 907x was a bit of a surprise as I came away with the impression that you thought you had a lower power eye piece.

I remember reading somewhere that there was no point in having large aperture in the urban areas but I suspect that whoever wrote that has had very little observing experience in light impacted areas with a large telescope. Much ink is spilled in magazines by those who live under dark skies, as would be expected, but little from observers of more typical locations.

It is remarkable how little planetaries care about light pollution. In a way it is more of a miracle that a telescope can fish these objects out of what is otherwise a blank sky.

On Friday, September 3, 2021, 09:19:06 AM EDT, Kent Blackwell <kent@...> wrote:


I really miss observing in dark Coinjock skies with the 25" telescope but I'm having fun observing in light polluted skies as well, and it's so convenient having the telescope in my own backyard. Not only do the planets look amazing (when seeing allows) but so do planetary nebulae. Last night NGC 7009, The Saturn Nebula looked amazing using a 3.5mm Pentax eyepiece that yielded a whopping 907x. Also interesting was NGC 6818, The Little Gem in Sagittarius at high power. Shifting back to only 200x NGC 6537 "The Red Spider" was interesting, hardly resembling a spider though. The real jewel of the night was M 17, The Omega Nebula, especially when using a nebula fitter such as the OII or the Orion UltraBlock at 200x. Oh yes, and the Great Red Spot was dead center on Jupiter's meridian. Seeing wasn't what it was before remnants of Hurricane Ida slipped north and west of us but it was still quite impressive. My last object of the night was Neptune. Even in the 25" at 200x Neptune is still small, but the orb is a beautiful color green. 

Kent B


City observing with a 25"

Kent Blackwell
 

I really miss observing in dark Coinjock skies with the 25" telescope but I'm having fun observing in light polluted skies as well, and it's so convenient having the telescope in my own backyard. Not only do the planets look amazing (when seeing allows) but so do planetary nebulae. Last night NGC 7009, The Saturn Nebula looked amazing using a 3.5mm Pentax eyepiece that yielded a whopping 907x. Also interesting was NGC 6818, The Little Gem in Sagittarius at high power. Shifting back to only 200x NGC 6537 "The Red Spider" was interesting, hardly resembling a spider though. The real jewel of the night was M 17, The Omega Nebula, especially when using a nebula fitter such as the OII or the Orion UltraBlock at 200x. Oh yes, and the Great Red Spot was dead center on Jupiter's meridian. Seeing wasn't what it was before remnants of Hurricane Ida slipped north and west of us but it was still quite impressive. My last object of the night was Neptune. Even in the 25" at 200x Neptune is still small, but the orb is a beautiful color green. 

Kent B


Re: Patterson Observatory (Sierra Vista AZ)

Kent Blackwell
 

The Patterson Observatory looks fantastic. Great tour, too.


Re: Polar Alignment

Jim Tallman
 

Lol.. we didn't get this email either Dino 😎

Jim

Sent from my Verizon, Samsung Galaxy smartphone
Get Outlook for Android


Re: Polar Alignment

galacticprobe
 

UEPH...

Unforced Errors Per Hour - Tennis
Unaccompanied Enlisted Personnel Housing - Military
United Earth Planetary Headquarters - Top Secret Space Exploration Agency (oops: said too much already)
Ultra Efficient Polymer Hybrid - Some sort of membrane

Take your pick. The only other "UEPH" I could find were college-level course code numbers relating to physics (i.e. UEPH-104, UEPH-105, etc.), with no explanation of what the "UEPH" stood for in the courses.

Dino.
P. S. Has anyone gotten any emails I've sent out in the past couple of weeks regarding this Polar Alignment article in AAM - which is a mag I don't get? Asking because something else I'm not getting: responses to those emails I've sent out. (Starting to no longer feel welcome around here.)


-----Original Message-----
From: William Rust <willrust@...>
To: BackBayAstro@groups.io <BackBayAstro@groups.io>
Sent: Thu, Sep 2, 2021 3:09 pm
Subject: Re: [BackBayAstro] Polar Alignment

I don't really know.   It was printed on the blank I used and is a high-density poly of some sort.  I have had it for ages, and is probably obsolete.  It warps easily, and if the label is wrong, I am wrong.  The closest I could find is UHMW poly, or ultra-high molecular weight poly.


From: BackBayAstro@groups.io <BackBayAstro@groups.io> on behalf of George Reynolds via groups.io <pathfinder027@...>
Sent: Saturday, August 28, 2021 9:45 AM
To: BackBayAstro@groups.io <BackBayAstro@groups.io>; William Rust <willrust@...>
Subject: Re: [BackBayAstro] Polar Alignment
 
Bill, your article in AA was fascinating! Your attention to detail and math skills are impeccable. Not being an imager, much of it ( most of it) was over my head, but I was impressed with your work and your patience, and your detailed explanations. BTW, what does "UEPH" stand for?

George


On Fri, Aug 20, 2021 at 11:43, William Rust
<willrust@...> wrote:
I can probably do that in October.  Oh, by the way, I am not trying to compete with out of the box equipment and software.  I just did the math and field tested it.  It works pretty well.  It is a big improvement over the old-style drift method.
Bill


From: BackBayAstro@groups.io <BackBayAstro@groups.io> on behalf of Jeff Goldstein <jeffgold1@...>
Sent: Thursday, August 19, 2021 7:40 PM
To: BackBayAstro@groups.io <BackBayAstro@groups.io>
Subject: Re: [BackBayAstro] Polar Alignment
 
I like the idea! Perhaps a “mini presentation 10 minute” at the next club meeting?  Just my $0.02
 
Jeff G.
 
From: BackBayAstro@groups.io <BackBayAstro@groups.io> On Behalf Of William Rust
Sent: Wednesday, August 18, 2021 5:38 PM
To: BackBayAstro@groups.io
Subject: [BackBayAstro] Polar Alignment
 
Hi everybody.  The Pandemic gave me some incentive to finish an astrojob sitting on my desk waiting for me to polish it up.  I did that in March, and submitted my article to Amateur Astronomy Magazine, Summer 2021.  The title is: "Robust Polar Alignment with Flatness Application".  It works pretty fast (say 45 min for 3 sets of star sightings) to get to about 0.5 arcmin error in Altitude and Azimuth. Anyway,  Anything closer that that requires more sightings and is very tricky.  I thought I would share.  If you do astroimaging, then this would be a technique that might benefit you. I can send you a copy if you dont get AAM.
Bill


BBAA Zoom Link

Jeff Goldstein
 

Live meeting at JC12

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Re: Patterson Observatory (Sierra Vista AZ)

Paul
 

What a cool place, Ted! The virtual tour is outstanding. And so many cool things are showcased. Quite a talented group of people! Even the building is pretty cool with its "constellation windows."  Thanks for sharing!
 - Paul


On Thu, Sep 2, 2021 at 3:27 PM Ted Forte <tedforte511@...> wrote:

I have probably mentioned the Patterson Observatory a few times on this forum.  I’ve been “Director” at this observatory since 2013. It’s sort of the club house for our astronomy club and a center of many of our outreach events. It’s pretty much my second home here.

 

The Patterson Observatory is listed as a NASA Space Place and has a 16 foot dome, housing a Ritchey-Chretien telescope of 20” aperture.

The 3D tour of the observatory was created by Ryan Straight, a professor at the University of Arizona, College of Applied Science and Technology cyber program. I hope you enjoy it.

 

Ted

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