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Johnny
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5/22/2017 10:39 AM
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Hey Willie, Sorry for the late response. I'm in Arizona visiting with my daughter's family, have just been really busy. Great job with the comet imaging. I'm really impressed with the video, and so ate those I've shown it to. Thanks, Johnny Sent from my iPhone On May 20, 2017, at 12:56 AM, "Astrophotography" <astrophotography@centexastronomy.org> wrote: > > > > The night of the 5-15-17 I also took some images of comet 2015 V2 Johnson with both my scope and the big scope. I finally finshed processing them yesterday so I will follow with several messages containing the results. > > First a short video of 7 x 300s Lum taken with my SBIG200XM on my William Optics 132 FLT, stacked on the stars. > > If the video is not attached to this message, you will have to go to the forum on the CTAS website. > > Willie > > Attachment(s): > File: 20170515-2342c-V2-stars-480p.mov (772.1 KB) -- Address: http://s3.amazonaws.com/ClubExpressClubFiles/901132/attach/1730188_0_20170515-2342c-V2-stars-480p.mov > > > >>> --------------------------------------------------------------------------------------<< > You have received this message as a member of: Central Texas Astronomical Society > Change preferences (including opt-out): https://CTAS.clubexpress.com/content.aspx?page_id=13&club_id=901132 > >
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Dave
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5/21/2017 7:57 PM
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Willie : You need to save images for th AL comet certificate. Dave ---------- Original Message ---------- From: "Astrophotography" <astrophotography@centexastronomy.org> To: "jde209@netzero.net" <jde209@netzero.net> Subject: re: Comet C/2015 V2 Johnson <<$173020449092$>> Date: Sat, 20 May 2017 04:28:11 -0500 And the same image annotated. Willie Attachment(s): File: 20170516-2015_V2-stars-Med-wcs-ann.png (245.7 KB) -- Address: http://s3.amazonaws.com/ClubExpressClubFiles/901132/attach/1730204_0_20170516-2015_V2-stars-Med-wcs-ann.png
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Dave
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5/21/2017 7:52 PM
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Looks good . Are you using Image J for stacking? Dave ---------- Original Message ---------- From: "Astrophotography" <astrophotography@centexastronomy.org> To: "jde209@netzero.net" <jde209@netzero.net> Subject: re: Comet C/2015 V2 Johnson <<$173019198237$>> Date: Sat, 20 May 2017 03:07:06 -0500 And now the same 7 images aligned on the comet. Willie Attachment(s): File: 20170515-2342c-V2-comet-Med.jpg (71.7 KB) -- Address: http://s3.amazonaws.com/ClubExpressClubFiles/901132/attach/1730191_0_20170515-2342c-V2-comet-Med.jpg
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Dave
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5/21/2017 7:47 PM
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Good video Dave ---------- Original Message ---------- From: "Astrophotography" <astrophotography@centexastronomy.org> To: "jde209@netzero.net" <jde209@netzero.net> Subject: re: Comet C/2015 V2 Johnson <<$173018848459$>> Date: Sat, 20 May 2017 02:56:49 -0500 The night of the 5-15-17 I also took some images of comet 2015 V2 Johnson with both my scope and the big scope. I finally finshed processing them yesterday so I will follow with several messages containing the results. First a short video of 7 x 300s Lum taken with my SBIG200XM on my William Optics 132 FLT, stacked on the stars. If the video is not attached to this message, you will have to go to the forum on the CTAS website. Willie Attachment(s): File: 20170515-2342c-V2-stars-480p.mov (772.1 KB) -- Address: http://s3.amazonaws.com/ClubExpressClubFiles/901132/attach/1730188_0_20170515-2342c-V2-stars-480p.mov
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Willie
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5/20/2017 4:09 AM
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And the same image annotated.
Willie
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Willie
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5/20/2017 4:08 AM
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And here are the same frames aligned on the stars.
Willie
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Willie
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5/20/2017 4:07 AM
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All of these images were bias, dark & flat processed and then stacked and aligned in AstroImageJ.
Here is a median combined image aligned on the comet.
Willie
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Willie
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5/20/2017 3:52 AM
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Here is a video of 11 x 180s using the Power camera on the 24" telescope. The center of this sequence was 11:50:28 pm CDT.
From SkySafari 5 Pro
C/2015 V2 (Johnson) is a 6th magnitude Comet appearing in the constellation Bootes. Its orbit is parabolic, and its closest approach to the Sun is 1.6 AU.
At the time of this sequence it was 132.8 million km distant, 7.38 light minutes
Willie
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Willie
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5/20/2017 3:03 AM
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And finally the same 7 images aligned on the comet but with the color scale reversed.
Willie
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Willie
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5/20/2017 3:01 AM
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And now the same 7 images aligned on the comet.
Willie
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Willie
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5/20/2017 3:00 AM
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This is an image of the median combine of the same 7 images, aligned on the stars. You can see that the comet is elongated slightly.
These images were only dark corrected, stacked and aligned. The screen stretch is the the default by AIJ saved as a JPG.
Willie
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Willie
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5/20/2017 2:54 AM
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The night of the 5-15-17 I also took some images of comet 2015 V2 Johnson with both my scope and the big scope. I finally finshed processing them yesterday so I will follow with several messages containing the results.
First a short video of 7 x 300s Lum taken with my SBIG200XM on my William Optics 132 FLT, stacked on the stars.
If the video is not attached to this message, you will have to go to the forum on the CTAS website.
Willie
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Jeffrey McClure
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5/17/2017 9:28 PM
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It’s amazing what one can get into on a cloudy night Willie and Johnny.
I copied the image you sent Willie, then processed it a bit and identified a couple of galaxies in addition to PGC 84591. There are several more just out of the frame. Sorry for the image rotation, but west-up is the way Sky Safari presents the map and to find the galaxies I needed them to align.
Hi Johnny.
I took 16x180s images last night with the Power camera and big scope of the field of view from your image. I just wanted to see how much detail of the faint galaxies I could bring out.
Seeing was 2.5 arcsec, but transparency was pretty marginal with thin clouds moving across the sky all night. I culled 5 images and then stacked the remaining 11 in AstroImageJ. I probably should have culled more of the images.
My post-processing skills are pretty minimal. Anyway, here it is.
Willie
One more thing. Does anyone have a way of finding out which edge-on galaxy that is in the upper edge of the image just above the comet (very faint)? It doesn't show up in Starry Nights or on my 2000 Sky Atlas charts. Johnny -----Original Message----- From: "Astrophotography" < astrophotography@centexastronomy.org> Sent: Sunday, May 14, 2017 11:30am To: " johnnyb@reagan.com" < johnnyb@reagan.com> Subject: Comet C/2015 V2 Johnson <<$172601664390$>> I got out for a short time last night to see how Comet C/2015 V2 Johnson was progressing, plus I wanted to catch it as it passed by a couple of fairly bright stars in Bootes. This image is a combination of 2X60 sec. images taken just before 10 pm. CDT using my Canon T4i on the 12.5" f/6 Newt. I used 3200 iso to try and capture as much as I could using 60 sec. exposures. As you can see, it has a short stubby dust tail, and reported to have an ion tail, but I wasn't able to pick that up. It was 24 arc mins. from two bright stars, 4.3 mag. Alkalurops and 6.5 mag. Mu2 Bootis, in Bootes. The stars made it an easy target to find, and see with 10X50 Binos. It will continue to travel to the south and pick up a little more speed as it makes a close approach to Earth on June 5th. It will be at perihelion on June 12th, and should be a good mag. brighter by then. Estimates put it between 7.5 and 8 mag. now. Also, on June 13 it will be between 5 to 20 arc mins. from a trio of 5th to 6th mag. stars. That should make for a nice shot if the weather is kind. Attachment(s): File: 5-13-17-2X60s-2015-V2-Johns.jpg (572.8 KB) -- Address: http://s3.amazonaws.com/ClubExpressClubFiles/901132/attach/1726016_0_5-13-17-2X60s-2015-V2-Johns.jpg--------------------------------------------------------------------------------------<<
You have received this message as a member of: Central Texas Astronomical Society Change preferences (including opt-out): https://CTAS.clubexpress.com/content.aspx?page_id=13&club_id=901132
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Willie
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5/16/2017 4:13 PM
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Hi Johnny.
I took 16x180s images last night with the Power camera and big scope of the field of view from your image. I just wanted to see how much detail of the faint galaxies I could bring out.
Seeing was 2.5 arcsec, but transparency was pretty marginal with thin clouds moving across the sky all night. I culled 5 images and then stacked the remaining 11 in AstroImageJ. I probably should have culled more of the images.
My post-processing skills are pretty minimal. Anyway, here it is.
Willie
One more thing. Does anyone have a way of finding out which edge-on galaxy that is in the upper edge of the image just above the comet (very faint)? It doesn't show up in Starry Nights or on my 2000 Sky Atlas charts. Johnny -----Original Message----- From: "Astrophotography" < astrophotography@centexastronomy.org> Sent: Sunday, May 14, 2017 11:30am To: " johnnyb@reagan.com" < johnnyb@reagan.com> Subject: Comet C/2015 V2 Johnson <<$172601664390$>> I got out for a short time last night to see how Comet C/2015 V2 Johnson was progressing, plus I wanted to catch it as it passed by a couple of fairly bright stars in Bootes. This image is a combination of 2X60 sec. images taken just before 10 pm. CDT using my Canon T4i on the 12.5" f/6 Newt. I used 3200 iso to try and capture as much as I could using 60 sec. exposures. As you can see, it has a short stubby dust tail, and reported to have an ion tail, but I wasn't able to pick that up. It was 24 arc mins. from two bright stars, 4.3 mag. Alkalurops and 6.5 mag. Mu2 Bootis, in Bootes. The stars made it an easy target to find, and see with 10X50 Binos. It will continue to travel to the south and pick up a little more speed as it makes a close approach to Earth on June 5th. It will be at perihelion on June 12th, and should be a good mag. brighter by then. Estimates put it between 7.5 and 8 mag. now. Also, on June 13 it will be between 5 to 20 arc mins. from a trio of 5th to 6th mag. stars. That should make for a nice shot if the weather is kind. Attachment(s): File: 5-13-17-2X60s-2015-V2-Johns.jpg (572.8 KB) -- Address: http://s3.amazonaws.com/ClubExpressClubFiles/901132/attach/1726016_0_5-13-17-2X60s-2015-V2-Johns.jpg--------------------------------------------------------------------------------------<<
You have received this message as a member of: Central Texas Astronomical Society Change preferences (including opt-out): https://CTAS.clubexpress.com/content.aspx?page_id=13&club_id=901132
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Jeffrey McClure
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5/15/2017 8:34 PM
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Willie, you and I must have similar obsessions. I found two more galaxies in Johnny's image, PGC 54968 and PGC 3088334.
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Johnny
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5/15/2017 3:58 PM
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Wow! Amazing work Willie! I looks like you've nailed it! I really appreciate the investigative time you put in, plus, I had no idea how many other galaxies were in the area.
I would have probably missed this one had it not been for another person who posted a much better image of the comet on Spaceweather.com taken at the same time. His showed the galaxy much better, but he didn't mention it in his description. I then look back on mine, and found it. What really gets me is that I had a 2 min. exposure that I was able to get that looked fairly decent. It's the first time I was able to go that long with my primitive tracking system avoiding the periodic error. As I was culling through the images, I mistakenly discarded it. I did salvage one fairly decent 90 sec. exp. that shows it a little brighter. I'll attached it, but it might not make it like your earlier attachments didn't.
Thanks again, Johnny
-----Original Message-----
From: "Astrophotography" <astrophotography@centexastronomy.org>
Sent: Monday, May 15, 2017 5:22am
To: "johnnyb@reagan.com" <johnnyb@reagan.com>
Subject: re: Comet C/2015 V2 Johnson <<$172631144803$>>
I can see the galaxy. I did a plate solve with AstroImageJ and it then searched using the coordinates 15:22:47.693 +37:41:57.47. The nearest galaxy identified by Simbad was
http://simbad.harvard.edu/simbad/sim-id?Ident=%402936865&Name=2MFGC%2012422&submit=submit
2MFGC 12422 from the 2MASS Flat Galaxy Catalog
ICRS coord. (ep=J2000) : 15 22 46.871 +37 42 01.29 (Infrared)
Willie
> On May 14, 2017, at 7:16 PM, Astrophotography <astrophotography@centexastronomy.org> wrote:
>
> One more thing. Does anyone have a way of finding out which edge-on galaxy that is in the upper edge of the image just above the comet (very faint)?
>
>
> It doesn't show up in Starry Nights or on my 2000 Sky Atlas charts.
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abrickhouse
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5/15/2017 2:03 PM
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Excellent picture Johnny . Aubrey -----Original Message----- From: mailer@mail2.clubexpress.com [mailto:mailer@mail2.clubexpress.com] On Behalf Of Astrophotography Sent: Sunday, May 14, 2017 7:16 PM To: abrickhouse1@att.net Subject: re: Comet C/2015 V2 Johnson <<$172617656312$>> One more thing. Does anyone have a way of finding out which edge-on galaxy that is in the upper edge of the image just above the comet (very faint)? It doesn't show up in Starry Nights or on my 2000 Sky Atlas charts. Johnny -----Original Message----- From: "Astrophotography" <astrophotography@centexastronomy.org> Sent: Sunday, May 14, 2017 11:30am To: "johnnyb@reagan.com" <johnnyb@reagan.com> Subject: Comet C/2015 V2 Johnson <<$172601664390$>> I got out for a short time last night to see how Comet C/2015 V2 Johnson was progressing, plus I wanted to catch it as it passed by a couple of fairly bright stars in Bootes. This image is a combination of 2X60 sec. images taken just before 10 pm. CDT using my Canon T4i on the 12.5" f/6 Newt. I used 3200 iso to try and capture as much as I could using 60 sec. exposures. As you can see, it has a short stubby dust tail, and reported to have an ion tail, but I wasn't able to pick that up. It was 24 arc mins. from two bright stars, 4.3 mag. Alkalurops and 6.5 mag. Mu2 Bootis, in Bootes. The stars made it an easy target to find, and see with 10X50 Binos. It will continue to travel to the south and pick up a little more speed as it makes a close approach to Earth on June 5th. It will be at perihelion on June 12th, and should be a good mag. brighter by then. Estimates put it between 7.5 and 8 mag. now. Also, on June 13 it will be between 5 to 20 arc mins. from a trio of 5th to 6th mag. stars. That should make for a nice shot if the weather is kind. Attachment(s): File: 5-13-17-2X60s-2015-V2-Johns.jpg (572.8 KB) -- Address: http://s3.amazonaws.com/ClubExpressClubFiles/901132/attach/1726016_0_5-13-17-2X60s-2015-V2-Johns.jpg
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abrickhouse
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5/15/2017 2:03 PM
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Great job. Aubrey -----Original Message----- From: mailer@mail2.clubexpress.com [mailto:mailer@mail2.clubexpress.com] On Behalf Of Astrophotography Sent: Monday, May 15, 2017 12:18 PM To: abrickhouse1@att.net Subject: re: Comet C/2015 V2 Johnson <<$172665414124$>> Willie beat me to it, but yup, PGC 84591 is the culprit. Pretty good catching a mag 15.9 galaxy in a quick shot like that. One of the reasons I like SkySafari5 Pro (and I have ll the other popular packages) is that it seems to have a LOT more deep space data than any of the others. It also has a link to the Deep Space Survey (DSS) on all the objects. Here is the DSS image of your galaxy. On Mon, May 15, 2017 at 6:23 AM, Astrophotography <astrophotography@centexastronomy.org> wrote: SkySafari5 Pro identifies this galaxy as PGC 84591 15:22:45.98 +37:42:9 J2000 PGC 84591 is a 15th magnitude Spiral Galaxy appearing in the constellation Bootes. It is 348 million light years from our solar system. PGC 84591 appears roughly 1.0 x 0.4 arcminutes in size, corresponding to a physical diameter of 99507 light years. It is a spiral galaxy of morphological type Sc, and is receding at 7102 kilometers per second - about 2.4% of light speed.
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Jeffrey McClure
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5/15/2017 12:12 PM
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Willie beat me to it, but yup, PGC 84591 is the culprit. Pretty good catching a mag 15.9 galaxy in a quick shot like that.
One of the reasons I like SkySafari5 Pro (and I have ll the other popular packages) is that it seems to have a LOT more deep space data than any of the others. It also has a link to the Deep Space Survey (DSS) on all the objects. Here is the DSS image of your galaxy. 
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Jeffrey McClure
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5/15/2017 11:57 AM
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Clearly your usual amazing work Johnny!
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