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#1 Asbytec

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Posted 06 November 2013 - 10:18 PM

The night began with a revisit to 13 Del (P.A. 199 SEP 1.5 MAG 5.64-8.24) and confirmed resolution in moments of better seeing. IN a recent thread, in about 6 or 7/10, I strongly suspected it to blend with the ring due south. Tonight in moments of 8/10, the speck of a companion was glimpsed several times, the rings were more steady often enough.

On to Aries, beginning with 10 Ari (P.A. 345.6 SEP 1.47 MAG 5.82-7.87.) This one was pretty easy, but the companion did appear to be involved with the first ring much like 13 Del on a previous night. It was more of a brighter lump or arc that held steady at a PA just west of north. Seeing was about 7/10. Curious, whereas 13 Del companion was a fainter, fleeting speck, this companion being a tad brighter appeared more bright and easy. Delta magnitude was 2.6 for 13 Del and 2 for 10 Ari.

Next is STF 194 AB (P.A. 278 SEP 1.3 MAG 7.62-9.46.) It was pretty easy and held steady, but the pair appeared dim at 8th and 10th magnitude, respectively. No rings seen, just two small discs.

Epsilon Ari AB (P.A. 209.6 SEP 1.36 MAG 5.17-5.57) is a classic "headlights in the distance" split, though the companion was a bit dimmer. The rings might have had a bit of a pinch to them, but the dark space was clearly visible.

Now, BU 1030 (P.A. 102.7 SEP 0.8 MAG 7.81-9.67) was the most interesting double that night. At 0.8" arc it's easily a Dawes split, or is it? It was actually pretty tough, not nearly as easy as 7 Tau (brighter and tighter), for example. At first, BU 1030 appeared to be an out of focus star. Focusing did not seem to help, so I realized I was observing a tight pair. I managed to re-focus on the pair, but had to check with a brighter star nearby. Attaining good focus, I was able to barely discern a faint dark space in the steadiest moments. It was clearly a tight double but appeared to be tighter than 0.8" arc would imply. Maybe the dim magnitude of the pair played a role. But, it was observed and confirmed at PA just south of west (about 100 degrees.) I observed this one for a good long time. The sketch below does not do justice to the difficulty of this pair, it's harder than it looks being dim with delta magnitude of 1.86.

STF 381 (P.A. 107 SEP 1.1 MAG 7.56-8.75) was not the last on the list, but it was the last successful split of the evening. I spotted the companion right away and held it mostly. It did appear as a spot and sometimes an arc on the first ring, I dunno maybe a little wider than 1.1" advertised.

Two other doubles remained on the list, the first was STT 49 (P.A. 50 SEP 2.3 MAG 6.8-9.92.) I did attempt this one is deteriorating seeing conditions. The images was bouncing a lot more and the naked eye stars were twinkling rapidly. At first, I just could not see the companion, so I cheated and checked it's PA, Sep, and magnitude. After focusing on that spot for a period of time, I felt like I might have glimpsed it. It was very difficult at best and uncertain at least. I chose not to call this one as I was flirting with false positives and having cheated the observation.

The last double on the list was A 2220 (P.A. 226 SEP 1.8 MAG 7.78-11.41.) Being I was unsure of limiting magnitude and having failed STT 49, I decided not to attempt this one given the worsening conditions. The companion just seemed to dim and with delta magnitude of 3.6, it just seemed not worth the attempt and star hopping to find it. It was getting late. It might be doable, though, on a better night along with STT 49. (Two more on the long list to revisit.)

Seeing was 7 to 8/10 early and worsened later to about 7/10 with jittery images. NELM was 4.5, and Deneb seemed to have about 60 to 65" arc nimbus radius.

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#2 azure1961p

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Posted 07 November 2013 - 07:57 AM

Norme

Superb work. You've bagged a good set.

Epsilon Aries looks like a great object - Ive got to give that one a spin. What's a little vexing here however is Bu1030 - at 0.8" it should appear touching with a pronounced pinch if Ive got it right. Like Dawes but more depthful notch wise and a little less close. I'm going out on a limb here and suspecting they have moved beyond what the spec sais it should be. I'm getting that the dimness may be showing smaller spurious discs and hence a gap but it still seems like it'd be tighter if it were 0.8".! Glad you got 13 Delphini - as mentioned before I think my dufficult double nights are on hold till a better season. Ill still try but - eh.

10 Aries looks like it'd be more difficult than 13 del though I can see its shines with a stronger light for all that its involved with the ring.

Epsilon Aries - hmmm not the only double in that constellation that evokes the cosmic headlights approaching look.

Pete

#3 Asbytec

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Posted 07 November 2013 - 08:24 AM

Pete, yea, BU 1030 was interesting. Again, the sketch really does not do justice, it's more of a rendering of what it might look like. The pair actually appeared to be very tight and, of course, dim. Really, though, one could see a Dawes dark space between two dim (basically) points.

If I sketched it exactly as it looked, it would be hard to see in the sketch (for the sake of the reader.) Dim them up a bit and push them closer...maybe I'll play with it for a more realistic look.

More like this, if you squint. This is still too easy, but more realistic. It gave the impression is was much tighter than 0/8" arc with a dark space between two (presumably smaller and certainly dimmer) spurious discs. One would think you could see a 'black' space, I could not tell if it was black (more like Epsilon) or just dark. It was just dark, and then only when seeing allowed. Otherwise it appeared more a fuzzy elongated star.

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#4 R Botero

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Posted 07 November 2013 - 05:30 PM

Great report and drawings Norme. Thanks for sharing with those of us under cloudy skies!

#5 azure1961p

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Posted 07 November 2013 - 06:30 PM

Ive gotta be more productive in my drawings. Sometimes its enough just to get a written account done. I've always liked the graphics in this forum.

Pete

#6 Asbytec

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Posted 07 November 2013 - 08:14 PM

Pete, yea, I'd like to see more images, too. I need to focus more on color, too.

Rob, thank you. It was enjoyable grabbing some tough ones that were not impossible. Good luck with the clouds, with super Typhoon Haiyan lurking just off shore, one in a series of tropical disturbances, I feel you're pain.

#7 R Botero

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Posted 08 November 2013 - 03:55 AM

Oh yes, good luck with that massive typhoon. We are all keeping our fingers crossed.

Roberto

#8 Asbytec

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Posted 08 November 2013 - 04:15 AM

Down south is getting pounded pretty hard, oh man. No reports yet. We get the northern edge, pretty tame so far. I think there was a tornado nearby earlier, friend got video of some very localized strong winds.

#9 azure1961p

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Posted 08 November 2013 - 07:13 PM

Hope alls well.

Pete

#10 WRAK

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Posted 09 November 2013 - 07:39 AM

Norme, well done with BU1030 (eXeedingly Difficult with your scope with seeing ~7 Pickering according to Lord's RoT and my RoT algorithm suggests 188mm aperture with 0.31 CO for a 50% resolution chance) and your sketches give a far too easy impression I think.
Wilfried

#11 Asbytec

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Posted 09 November 2013 - 08:47 AM

Wilfried, really? BU is that hard requiring about 188mm? (Patting myself on the back, gimme a minute.) :)

But, sure enough, it was a tiny pair of dim spots with a dark space. Wow, sometimes I feel proud. Thank you.

#12 azure1961p

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Posted 09 November 2013 - 09:29 AM

Norme , sorry but you need to pull the sketches. Sorry man.

Pete

#13 Asbytec

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Posted 09 November 2013 - 12:49 PM

Too late, some have already been downloaded...the word is out, and no putting the cat back in the bag. Besides, I already broke my arm patting myself on the back. :grin:

#14 WRAK

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Posted 13 November 2013 - 06:45 AM

Made a selection of doubles in Aries with proposed apertures from 135 to 185mm for a 0.31 CO scope with a good deal of light pollution (NEML 3.5) - would be interesting what can be done with 150mm:
ID Name RA Dec Separation Magnitude Magnitude2
WDS02391+2854 ES324 02:39:04.4 +28:53:18 2,7 10,60 11,80
WDS01548+1728 A2323 01:54:46.6 +17:28:01 1,6 9,50 10,88
WDS02311+1214 HEI442 02:31:05.7 +12:13:33 1,9 10,18 11,40
WDS02448+1544 TDS93 02:44:49.4 +15:43:40 2,1 11,23 11,66
WDS02114+1532 HEI21 02:11:27.1 +15:31:31 2,4 10,33 11,80
WDS02378+2419 POU211 02:37:50.8 +24:18:48 4,6 11,50 11,90
WDS03128+3003 MLB557 03:12:51.8 +30:02:46 1,8 11,07 11,53
WDS01486+1618 BU510 01:48:33.3 +16:18:22 1,7 8,69 10,90
WDS02400+2106 TDS2327 02:39:58.6 +21:06:20 1,4 11,10 11,28
WDS02558+1036 HEI445 02:55:50.4 +10:35:53 1,6 10,94 11,60
WDS03287+2010 TDS116 03:28:39.1 +20:09:56 1,1 10,49 10,54
WDS02203+2415 J1120 02:20:13.8 +24:14:03 3,5 10,00 12,00
WDS02140+2342 HU424 02:14:01.0 +23:41:52 1,4 9,27 11,04
WDS02483+2213 COU551 02:48:16.0 +22:13:20 1,6 9,41 11,35
WDS02080+2618 TDS2132 02:07:59.8 +26:17:31 1,6 9,41 11,37
WDS03242+2347 WOR4 03:24:06.5 +23:47:06 2,5 10,94 12,07
WDS02087+1045 HEI437 02:08:41.0 +10:44:15 1,5 10,84 11,70
WDS03009+2139 HU431 03:01:05.4 +21:40:02 1,1 10,75 10,97
WDS02085+2227 BRT2307 02:08:29.2 +22:26:58 3,0 11,00 12,10
WDS03163+1920 A2224 03:16:19.4 +19:20:16 0,9 8,25 9,63
WDS03050+1800 BRT2309 03:04:59.8 +18:00:47 1,5 11,60 11,90
WDS01546+1405 HEI208 01:54:38.0 +14:05:34 1,4 11,43 11,84
WDS02200+2632 COU355 02:20:02.6 +26:32:17 3,2 9,67 12,20
WDS02405+1801 COU462 02:40:30.4 +18:01:22 1,4 11,49 12,10
WDS03212+2109 COU259 03:21:14.6 +21:08:49 0,9 5,34 8,09
WDS02180+1251 HEI310 02:18:01.0 +12:50:26 1,2 11,30 11,80
WDS02480+1604 TDS96 02:48:01.3 +16:04:04 1,2 10,33 11,62
WDS02429+1754 COU23 02:42:55.1 +17:54:15 1,1 10,06 11,34
WDS02217+2631 A2014 02:21:40.8 +26:30:57 1,2 9,46 11,43
WDS02571+1048 HEI1 02:57:08.7 +10:48:14 2,5 9,99 12,30
Made also a SkySafari list for these 30 objects - be aware that SkySafari might have some doubles not in its database.
As uploads for .skylist files are here not allowed I have renamed it .txt - for use in SkySafari please rename it back to .skylist
Wilfried

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#15 Asbytec

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Posted 13 November 2013 - 08:36 AM

Okay, thanks...those are right up my alley. :)

Some look pretty dim, I've been staying close to 7th mag primary. But I will hit a few of them next clear night or two - this weekend looks promising with a bright moon, though.






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