Thursday, December 14, 2017

only the Moon (Toronto)

Spotted the Moon, waning crescent, over High Park. But I couldn't see Jupiter. Sky was too bright, me thinks.

Wednesday, December 13, 2017

new DDO team announced

At the RASC Toronto Centre meeting, the new team supporting the David Dunlap Observatory was announcement. Dr Bhairavi Shankar will chair the group which will report to the Education and Public Outreach chair. Arnold Brody, Eric Briggs, Liza Hancock, Chris Vaughan, and myself make up the rest of the committee.

Monday, December 11, 2017

no chance for meteors

Rhonda peeked outside and reported it was cloudy. Boo. No stars. No Geminids.

Sunday, December 10, 2017

IDed (a) double(s)

I learned (using the Washington Double Star database) that the bright pale orange star at the top-left corner of the M25 image, i.e. north-east from the centre of the open cluster Messier 25, is double star ARN 52.

It consists of a pair (only) with A at magnitude 7 and the secondary around mag 10. They are separated by 69 seconds of arc. The position angle of B is 262°. B is white.

SkyTools 3 Pro shows these stars as HD 170886 and TYC 06275-0740 1 respectively. The magnitudes match. The position information matches too.

Then B appears to have a tight deep red companion! Interesting.


Oop. Encountering more stuff.

The relatively bright star below BU 966 C is D, according to the WDS. Slightly brighter than Q. Almost due south of C. Close to C. Off-white. The D star is not listed in ST3P.


The WDS shows ARN 107 in the area. A simple pair, with magnitudes 9.7 and 10.9. The quoted PA is 289; sep. 21.2. This is nearly due south of BU 966 C (and D), east of the bright orange star TYC 06274-1625 1. The A star is white; B is grey. ST3P does not note this double; the individual stars are TYC 06274-1251 1 and TYC 06274-1349 1.


I noticed this in the August image but didn't dig deeper at the time. All white-grey stars. South-east of ARA 753 a very tight pair. The bright element is between the magnitude of 753 A and B. The position angle is around 135°. The stars are touching. So they are probably have a separation around 4". This extremely tight pair is to the north-north-west of a medium-bright star. This star shows in SkyTools as TYC 06274-1650 1 at mag 11. But the pair is not shown in the software!

The WDS refers to ARA 752. 752 is a pair, mag 11.0 and 11.6, PA 284, sep. 10.9. The angle is very different. The gap between the tight pair and the Tycho star looks double the ARA 753 sep. So, is this it? It's a little confusing.

Friday, December 08, 2017

Gaia DR1 available

Used Aladin briefly today to check on stars in Messier 25. Noticed, for the first time, a Gaia link. w00t! The first data release is accessible.

assembled M25 in colour

Had another go at Messier 25. I had tried processing the LRGB data (gathered on 7 Aug) previously and went through 3 iterations before getting something I was happy with.

open cluster Messier 25 in colour

FITS Liberator, Photoshop CS.

Most of the cluster's stars are white. There are some fantastic orange and red stars in the field.

The primary star of U Sgr aka BU 966 is orange. B is white. C is white. E is white. F is blue-white. G has a hint of yellow. H is bright grey. J is white. K is white. L has a hint of blue. M is light grey. P is grey. Q is grey. R is beige. The really faint star really close to R is red. S is white. T is white.

The equal, tight pair sharing the label GSC 06274-1098 appear to be the same colour, a very light sky blue.

ARA 753 A is a very pale blue; B is grey.

Thursday, December 07, 2017

most distant quasar discovered

Using the Magellan telescopes in Chile, scientists have discovered the furthest black hole to date. With light travel time more than 13 billion years, this makes it a young black hole, in one of the first galaxies. The quasar is 800 million times more massive than the Sun. That's big but there are bigger black holes. Check out the article at the CBC web site.

the title works

Mr Markov liked the subtitle of my first double star presentation. Unnoticed Treasures.

added important tips

Added some new items to the astronomy tips and tricks page over on the lumpy companion site. Specifically on noting the direction in the eyepiece (west), understanding the presentation in the ocular (rotated or mirrored), matching charts or maps to the telescope magnitude limits, and understanding the scale of the sky. I believe these very important for the new astronomer.

essentially nothing

I went through the December issues (which include the index for the respective year) of the RASC Journal all the way back to 2006 looking for pieces on double stars. And there was nothing. Amazingly, no specific articles on double or multiple star viewing, imaging, measurement, etc. I found one item, in the February 2008 issue, by Ling where he shared his discovery of a double star (ZC1042 aka SAO78770) during a lunar occultation. Cool. But it is somewhat shocking that there are no other items. Not sure why. Also, the author intimated he expected to have more discoveries and I didn't see anything.

Wednesday, December 06, 2017

documented GIMP workflow

Occasionally I only have GIMP at my disposal when trying to do LRGB processing on my images. I use it infrequently enough that I forget steps and specific commands. Here I quickly document the workflow.

These notes pertain to GIMP version 2.8 (which is 8-bit) running on an old version of Windows (32-bit).
  1. open all the TIF files (clearing the 16-bit warnings)
  2. change to full-colour mode
    1. pick any one of the images, e.g. the blue data
    2. choose Image, Mode, RGB
    3. rename layer: e.g. blue
  3. copy image data into layers (green, red, and luminance)
    1. go to other image window, e.g. green
    2. select entire frame: choose Select, All or press Ctrl-a
    3. copy: choose Edit, Copy or press Ctrl-c
    4. switch to target (RGB) image    
    5. paste: choose Edit, Paste as, New Layer
    6. rename layer: e.g. green
    7. close source image file (i.e. close the green data file)
    8. repeat for all source frames
  4. prepare to align
    1. except for the bottom layer, set each layer to partial opacity:
      click in middle of Opacity bar or drag or enter 50%
    2. zoom in
      1. click magnifying glass in Toolbox
      2. click in image (to zoom in)
      3. hold Ctrl key to zoom out
  5. align layers
    1. click layer to move
    2. activate Move tool:
      choose Tools, Transform Tools, Move or press M or click 4-headed arrow in Toolbox
    3. move layer
      1. drag with mouse
      2. nudge with arrow keys
    4. repeat for each layer
  6. save a version of the file *
  7. crop out the edges
    1. click Rectangle Select Tool from Toolbox or press R
    2. drag within the image
    3. choose Image, Crop to Selection
  8. colourise each layer
    1. click a layer
    2. choose Color, Colorize...
    3. set the parameters as necessary
      1. set Hue to required value, e.g. 120 for green
      2. set Saturation to 100
      3. set Lightness to 50
    4. repeat for each layer
  9. blend top two colour layers
    1. click a layer
    2. set layer mode to Screen
  10. set the luminance layer to Soft Light
  11. save a version *
  12. carry on, apply levels, curves, saturation, masks, etc. 
These steps are provided as an alternative to using Photoshop.

* Remember that GIMP does not support non-destructive editing of layers so consider layer duplication and saving versions of your file as you work.

assembled 54 Sgr in colour

Processed the LRGB data files for 54 Sagittarii gathered back in October. And did an experiment.

54 Sgr in colour, pale orange and pale blue

I specifically processed in GIMP 2.8 to update my workflow notes. Pale orange (A) and pale blue or white (C). The faint B star doesn't seem to have any particular colour.

down and left

Found a neat web page that let's you find your blind spot.

This is an important consideration when using a classic telescope where, of course, you only use one eye. And as astronomers acclimate to using their equipment and start going for more challenging deep sky, one learns to use averted vision, so to accommodate for the blind spot in a single eye.

blind spot test pattern for my left eye

The image is for my left eye, the one I normally use on the ocular. I could not see the blinking dot down (slightly) and left of centre.

Tuesday, December 05, 2017


A member of the Occult Watcher Yahoo!Group just posted the following.
I have downloaded the LunarOccultation dll, (for double stars) and i get the prediction feed presented which I have ticked.  But the add-in doesnt appear in the add-in menu under >configure add-ins.  As i understand it the add-in needs the location of Occult4 to work.  Have i missed something?
Isn't that interesting.


Hristo directed the user to the "publish" page which he had updated by deleting the link to the old MSI file. All right.

more lead and acid

Determined that a backup uninterruptible power supply failed during the recent power outage at the CAO. Recommended a replacement battery.

heard from Occult developer

Hristo forwarded an observation of mine to Dave. I thought it worrisome that the Occult installation instructions did not refer to the correct number of files in the archive. These days with virus, trojan, and malware concerns, it is a little unnerving when the zip file has different content than expected. He thanked me and said "I fully agree." Good. Hopefully, another little issue can be corrected to help future users.

DS occultations listed

I was still a little troubled that I wasn't seeing any Lunar Occultation events listed in OW. So I did a bit of digging.

At one point, I opened the regional double star file, NADoubles.txt, for North America. Wanted to see what was inside, if anything. Purportedly it is maintained by Mr Timerson. I was surprised to find a listing for the months of December and January, about two to three dozen each. But the star numbers didn't make any sense. Dec 1 noted "444cK6" and Dec 15 showed "2223SK0." These didn't look like SAO numbers. Was the ending bit hexadecimal? No... It looked like stellar class. Nothing came up in SkyTools.

The Dec 15 items caught my eye.
15 D 2223SK0
15 R 2223SK0

That date got me thinking so I fired up Stellarium and advanced the time rate. And after a while, Zuben Alkarab slid into view! An interesting triple star. Oh ho.

In SkyTools, I switched to the Special Events tab, activated the Two Bodies search, and looked for an occultation of the Moon and γ (gamma) Lib. Yes. Dec 15. Entry (or disappearance) at 9:59, mid-occultation at 10:36, and exit (or reappearance) at 11:17. Oh. Daylight. Maybe that's why it wasn't showing in Occult Watcher.

On a whim, initiated a Google search on 2223SK0. Got a hit. A page at the Lunar Occultations web site, showing the predictions for 2017 for Blue Springs Missiouri.
       day  Time     P   Star  Sp  Mag  Mag    % Elon Sun  Moon   CA   PA  VA  AA
 y   m  d  h  m   s       No  D     v    r V  ill     Alt Alt Az   o    o   o   o

17 Dec 15 14 27 57.6 d    2223SK0  3.9  3.4    6-  29   9 31 149 -88S 113 138 100
   R2223 = gamma Librae
      2223 is triple: Aa,Ab 4.0 4.2 0.10" 191.0, dT = +0.06sec : 
                      AB 4.0 11.2 43" 157.2, dT = +87sec
      2223 is a close double. Observations are highly desired
17 Dec 15 15 55 56.0 R    2223SK0  3.9  3.4    6-  29  20 36 174  87N 294 299 281
   R2223 = gamma Librae
      2223 is triple: Aa,Ab 4.0 4.2 0.10" 191.0, dT = +0.07sec : 
                      AB 4.0 11.2 43" 157.2, dT = +95sec
      2223 is a close double. Observations are highly desired

Coming together. But I still didn't understand exactly why some of these events were not showing in my candidate list.

Made a location in OW for Atlanta, Georgia that seemed better positioned. Nope. Still nothing.

Launched Occult to see if there was an issue there.


Occult shows the unusual star numbers. OK. Found some correlating information there. ZC and XZ lunar catalogs. Displayed a chart for the Moon with Zuben Alkarab. Tried to produce an animated GIF.

Changed the filter settings in OW and forced a sync. Ah ha!

Occult Watcher showing lunar occultations of double stars

At the bottom of the listing, the Lunar Occultation section appeared! So, at last, everything is working as required.


Learned that ZC is the zodiacal catalogue.

monitor power at CAO

Dealt with power outage issues at the Carr Astronomical Observatory. Likely the high winds knocked down a tree.

both happy

Hristo shared he was happy that I had things working in Occult Watcher. He encouraged me to report other issues to the Yahoo group or to him directly. Nice offer.

Monday, December 04, 2017

assembled Σ680 in colour

Processed double star Σ680 aka HR 1741 and HD 34579 in full colour. Imaged back on 6 Oct '17.

double star HR 1741 in colour

FITS Liberator, Photoshop CS2.

I think the primary is yellow or gold. When zoomed out, the secondary looks orange; when zoomed in close, the B star goes white.

There are lots of colourful stars in the field, blue through red.

penciled in 21 Feb

Tentatively accepted the Wed 21 Feb date for delivering my double star presentation during the RASC Toronto Centre recreational astronomy night meeting.

acknowledged error

Received a note from Hristo regarding the Occult Watcher software download page.
You are quite right, the page is confusing.   I should fix that.

Please ignore the "Download" link at the top to an .msi file, and follow the instructions underneath that are based on
OK, good. I made a contribution. Hopefully others will not experience the same pitfalls as me.

Sunday, December 03, 2017

test of polar scope

Headed to the back yard.

I couldn't see Polaris in the little scope. Oops. Forgot to open the shutter on the camera. Still couldn't see anything. Aimed to the full Moon. Ah ha! Played with the exposure setting in the AMcap software. But couldn't seem to stop it from being washed out. Moving the slider to the left increased the exposure value. Heading to Polaris again. Nothing. Went to Vega and saw the star. Shown my red flashlight in to see the reticule.

screen snapshot of test through polar scope

OK. So it works. The Logitech webcam attached to the Vixen polar axis scope. I was very happy the star was relatively in focus. But I need better software to give me more control of the camera. I want better exposure control. And a gamma control.


It burns!

notifications on smartphone including stoopid Moon reference

Snapshot from smartphone.

activated lunar occultations feature

Sat down to follow Hristo's latest instructions.

Removal. Deleted the software from the c:\Occult Watcher folder. Or tried. Windows threw an error that a file, one of the DLLs, was in use. Rebooted Win 10. Finished the delete.

Reinstall. Returned to the "publish" page. Once again, found it unclear. So I just took a top-down approach. Downloaded the MSI and ran it. I noted it installed Occult Watcher in the Program Files area! I thought we weren't supposed to do that. And I thought OW was supposed to start automatically. Tried to manually launch the app. Windows displayed a new error. The application immediately "stopped working." Oh boy. Rebooting did not resolve. Almost gave up. Don't need this... Keep going!

Made a note to tell Hristo about the confusing content on this page.

Update install. Downloaded the OW updater zip again. Installed the updater per the instructions on web page. i.e. not in Program Files. In fact, I used existing empty directory. Would that be a problem? When the updater finished, it immediately launched OW. OK, good. Some progress. Checked the version: 4.5. Good, the most recent. Once again, I observed that OW used my old settings, such as my location. Alas, the app seemed to be working OK.

Add-in install. Reviewed the Lunar Occultation add-in installation notes. Downloaded, unzipped, and installed. Noted the instruction that said, "After a restart a new feed called..." After a restart of what? The app or Windows? I simply restarted OW. This time, I did not install Occult Tools. Checked the add-in menu. Whiskey Tango Foxtrot. The Lunar Occ item was there! It didn't make any sense to me why it was working now and not working before. I assume there are steps performed by the OW update executable that rewrites things.

Lunar Occ add-in dialog box completed

Add-in configuration. I was very happy that the Lunar Occ add-in was available again. Finally, I could move on. I had been stalled for days. Launched the add-in. It showed as version 1.0.3 in the title bar. Huh. I thought it was supposed to be 1.1.0. Moving on. No update messages in the status bar. I went about configuring the dialog for my home elevation, the C8 aperture, and the double star resource. With some anxiety, I clicked the OK button. I think I held my breath... NO ERROR! Schlanger! That was the first time I ever got through the configuration! True progress.

So happy. I turned on feed for Lunar Occultations (after the fact; I believe in an early test I had turned it on beforehand). The OW app synced. All OK, normal beeps. I scrolled to the bottom of the list expecting to see a separate catagory, like how it shows on the add-ins information page. Maybe that's not happening as there are no candidate events. In my area. Sadly.

At no point did I touch Occult proper. I assumed that installation was fine. Certainly I was not asked to deal with it. So these issues were all related to Occult Watcher.


The add-in version issue appears to be a bug. That is, the version listed in the add-in dialog box title bar does not match the version shown in the DLL file properties. I checked again. The file shows 1.1.0.

what I was after

I explained the current/latest problem to Hristo. The OccultTools and Lunar Occ add-ins were not listing in the menu. So I could not run them. Sent a screen snap of the Add-ins menu and the app folder. I explained I was very interested in lunar occultations of double stars. That's why I wanted to add this capability to Occult Watcher. After running the MS debugging tool, I sent the captured log.

He said something odd. "Looking at the files in C:\Occult Watcher, it doesn't seem that this is a new installation." 'Cause I had most recently deleted and reinstalled everything on Friday.

Hristo gave me a sequence of steps to follow. He asked me to not change or rename any files in the "Occult Watcher" folder. I had only done that in one test. He asked me to change anything in the registry. I had never done that. If things were still wobbly, I'd need to send the logs again.


I just don't like the impression I get in these kind of situations from some software developers. It's not my fault. I didn't initially break this software. Maybe renaming some DLLs was problematic but it was for a very specific test. I didn't do it to break things. Why would I want to make things worse. And there was an assumption made that I was tinkering in the registry. I do not do so lightly ordinarily. And I didn't ever venture in for Occult Watcher.

Of late I have taken a conciliatory stance because I just want this software to work properly, as designed, as promised. I know that this developer is a volunteer. So demands of users can be perhaps daunting and overwhelming. I want to comply. But I also don't want to be treated poorly. I think the developer was getting frustrated and took a good approach, backing up a bit, regrouping. Let's get this sorted.

Saturday, December 02, 2017

explained super (Bradford)

Bree asked about the super Moon. And so started The Rant! I think she got a bit more than she bargained for...

I explained that this was all media hype. Selling newspapers! A disproportionate inflation of an event.

full Moon at close perigee

The reference to "super" Moon was that our natural satellite was closer to the Earth than at other times and therefore bigger and brighter. But I cautioned that if one was examining the Moon with just their eyes, they would not be able to see the difference. The next full Moon would be fractionally larger than the previous month's full phase. And it would be a tiny bit brighter. But a casual observer, using their eyes would not be able to tell. If carefully photographing the Moon over each full Moon phase and comparing the results, one would see the very slight difference in size. Joel also referred to a surveying instrument in his field that could measure this. To measure the change in brightness would require specialised light-sensitive equipment.

The Moon's orbit is elliptical. At times it is closer than average; other times further. This is known as perigee and apogee. And the Moon has been doing this for millions of years. Long before humans began observing the Moon and long before we starting keeping detailed records and measuring things. I wondered if people on the coasts, say in the Maritimes, found the whole super Moon business silly. Of course, the Moon at perigee could make for larger tides. Joel nodded in agreement. I knew the term "neap tide;" at the time I couldn't remember the other. [ed: "spring tide," which is the higher tide, during new and full Moon phases.]

This also gave me the opportunity to address the illusion effect, when the Moon is near the horizon. I showed Bree show to measure the Moon's diameter against her pinkie fingernail. I encouraged her to use this standard any time she thought the Moon looked different. She might be surprised.

Now all that said, I'm happy that people are talking about celestial objects and looking up in the night sky 'cause it's cool and all. The more we can talk about astronomy and science and physics the better.

I shared I was worried about the crying wolf effect. That civilians going outside will say, "Huh. Moon looks the same. Nothing special." And feel disappointed or even upset. And then in the future not bother getting off the couch.

Moon at perigee but at furthest distance from Earth

Nothing super about it.

When the bright Moon emerged from the mottled clouds, we measured it.

updated NGC life list

Tidied up my NGC life list over on the blog companion web site. Was missing a couple of entries. So there's over 410 now. And some RASC Finest NGCs were not tagged. Done, now. Again, I have 5 in the Finest category. And one revisited item hadn't been updated correctly; only 4 to re-examine. Yeah.

meteor seasons replotted

With some suggestions from Chris Vaughan, I regenerated my meteor plot chart. In particular, I used a Cauchy distribution formula to calculate intermediate values to the peak.

Cauchy formula

This is much better than my original graph where Excel interpolated the results, given the minimal data, with smoothed lines.

meteors plotted using Cauchy distribution

This effectively shows that meteor showers start slow, slowly build, then, blammo!, there's lots of activity, and then they fall off rapidly.

And, again, the main reason for my making this type of chart was to emphasise our meteor "seasons." Mid-July for a month is a high-water mark with 5 to 6 simultaneous showers. But fall and winter is the best with multiple showers running from mid-October into January plus the two best showers for the whole year.

Friday, December 01, 2017

updated ST3P on netbook

Did some more testing for Greg on SkyTools (under old Windows XP). Intriguing results. But whatever he did re-enabled the "current" update procedure as well as the online shared list downloads. Yeh! I was able get the current comets, minor planets, and supernovae updated and download the new Coldfield Observatory double star list to the John Repeat Dance computer.

pulled off-line

I think Hristo was getting upset with me. On the Yahoo!Group, I said I had deleted everything and reinstalled but it was not working. He thought I was doing "random" things. He pulled our conversation off-line saying it was "not relevant" to others. That's a poor way of saying that. The problem-solving and debugging is not helpful; a final outcome report would be. He addressed my past query at last. He said that where Occult Watcher stored settings was irrelevant. Gah. As an IT person, I'd prefer a more sophisticated response. Still, he wanted to help. He asked me to carefully explain the problem. He wanted details and screenshots. He also wanted a DebugView log capture.

he asked me to reload

Hristo asked me to do everything afresh. He sent a sequence of instructions. A sequence I had done myself, at least once. I was not happy about that. He wasn't directly answering some of my questions. I was very curious if goop in the Windows registry was messing with things. The previous installs of Occult Watcher had baked in some configuration settings that were now not changing or updating. But, I wasn't completely surprised by his response. It's often easier just to reload the app rather than figure out the root problem. The smash-it-with-a-hammer approach. OK. We'll do it that way.

Very different approach from Greg...