24 replies to this topic

[Cotts]

Out Struving last night in poor seeing, about Pickering 4/10.....  8-in Wirth Mak Newt.... Calm winds, Temps from 5C to 1C over 3 hour period.

 

Triple #1 in Eastern Monoceros.   Easy with 17.3mm Delos (70x).  

 

STF 1190 AB 4.46 10.32 33.2" 106º       08h 08m 36s  -02º 59' 02"

STF 1190 AC 4.46 9.68  64.9"  246º

STF 1190 AD 4.46 13.40 39.0" 285º (I did not see this component at any magnification)

 

Triple #2 in Sextans. Fine with 12mm Delos (101x)

 

STF 1464 AB 8.26 10.26 5.80" 302º   10h 41m 35s   -00º 16' 21"

STF 1464 AC 8.26 10.51 66.7" 226º

 

The double double in Hydra.  A bright-ish pair and a much fainter pair only about 1' away to the north...  The fainter 'pair' is not in the WDS and appears to be two field stars...

STF 1309 8.48 8.38 11.7" 273º    09h 06m 38s  +02º 49' 06"

 

The fainter pair has magnitudes 11.84 and 13.21, sep. 28.2"  PA 4.5º (data obtained from Sky Safari which conveniently gives separation and PA from the previous object you centered... So centre on 'A' and then centre on 'B' and read the data..

 

The 11.84 mag star is TYC 0229-2157-1 and has no other designation..

The 13.2 mag star is Gaia 577487219423400448 and has no other designation.

 

So, I proudly announce the discovery of Cotts 1. 

 

Dave

 

 

 

[SebastianTS]

Hi Dave.

 

Congratulations for the discovery of Cotts 1  .

Unfortunately I will not be able to observe it myself because I cannot see mag 13.2 with my instrument at my location. 

 

CS, Sebastian 

[chrysalis]

Out Struving last night in poor seeing, about Pickering 4/10.....  8-in Wirth Mak Newt.... Calm winds, Temps from 5C to 1C over 3 hour period.

 

Triple #1 in Eastern Monoceros.   Easy with 17.3mm Delos (70x).  

 

STF 1190 AB 4.46 10.32 33.2" 106º       08h 08m 36s  -02º 59' 02"

STF 1190 AC 4.46 9.68  64.9"  246º

STF 1190 AD 4.46 13.40 39.0" 285º (I did not see this component at any magnification)

 

Triple #2 in Sextans. Fine with 12mm Delos (101x)

 

STF 1464 AB 8.26 10.26 5.80" 302º   10h 41m 35s   -00º 16' 21"

STF 1464 AC 8.26 10.51 66.7" 226º

 

The double double in Hydra.  A bright-ish pair and a much fainter pair only about 1' away to the north...  The fainter 'pair' is not in the WDS and appears to be two field stars...

STF 1309 8.48 8.38 11.7" 273º    09h 06m 38s  +02º 49' 06"

 

The fainter pair has magnitudes 11.84 and 13.21, sep. 28.2"  PA 4.5º (data obtained from Sky Safari which conveniently gives separation and PA from the previous object you centered... So centre on 'A' and then centre on 'B' and read the data..

 

The 11.84 mag star is TYC 0229-2157-1 and has no other designation..

The 13.2 mag star is Gaia 577487219423400448 and has no other designation.

 

So, I proudly announce the discovery of Cotts 1. 

 

Dave

From CdC:

 

STF1190 AB   
Magnitude:  4.34/10.10
1782: 29.9"/105°
1998: 33.0"/105°
Spectral Class: G2Ib     
Note: Np
DM:-02  2450

J2000 RA:   8h08m35.60s   DE:-02°59'01.0"
Date  RA:   8h09m39.72s   DE:-03°02'48.6"

 

STF1464 AB   
Magnitude:  8.26/10.26
1831:  5.4"/302°
1998:  5.5"/302°
Spectral Class: F6V      
Note: Np
DM:+00  2694

J2000 RA:  10h41m35.40s   DE:-00°16'20.0"
Date  RA:  10h42m40.73s   DE:-00°23'01.8"

[c2m2t]

Hi Dave!

You picked some fine triples. On Monday evening, I decided to do some dedicated double star observing....as opposed to imaging. I felt I had enough time to wonder around Leo and Sextans while STF 1390 and Cotts 1 approached my local meridian...all that to let it rise as high in the sky as possible for my observation. Darn...I just missed it and being in the pod where doing meridian flips can be a pain, it will have to wait for the next time out. 

 

But as good fortune has it, I have all three of your observed systems and Cotts 1, , makes for an interesting high contrast brightness double double. Now you have a memento to remember the occasion!!

Cheers, Chris. 

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[chrysalis]

Hi Dave!

You picked some fine triples. On Monday evening, I decided to do some dedicated double star observing....as opposed to imaging. I felt I had enough time to wonder around Leo and Sextans while STF 1390 and Cotts 1 approached my local meridian...all that to let it rise as high in the sky as possible for my observation. Darn...I just missed it and being in the pod where doing meridian flips can be a pain, it will have to wait for the next time out. 

 

But as good fortune has it, I have all three of your observed systems and Cotts 1, , makes for an interesting high contrast brightness double double. Now you have a memento to remember the occasion!!

Cheers, Chris. 

STF 1190 looks like it's in an interesting field - need to check this one out !!

 

BTW, CdC map correlates basically exactly to your image !!

Edited by chrysalis, 07 April 2021 - 10:22 AM.

[Cotts]

Cotts 1 is quite close to STF 1309.  A bit less than 1'...  I can't see it in your image....

 

A deeper image will be required to pull it out...

 

See: Aladin DSS image via Stella Doppie.

 

Dave

 

 

[c2m2t]

Hi Dave!

It's definitely there!!...in the CN image but has been so dimmed by the file size reduction. I can send you the full size image...actually quite small given my processing regimen. If you like to have it, just email me...my email is on my profile.

 

Cheers, Chris.

[c2m2t]

Hi Mark!

 

STF 1190 looks like it's in an interesting field - need to check this one out !!

 

BTW, CdC map correlates basically exactly to your image !!

I would hope that my image is matching what the CdC is showing...I am through 60% of a 5000 system list and I'll be darned disappointed if they didn't match!! Don't want to appear mis-informed here...but what the heck is "CdC"?? I don't recognize that acronym!!

 

Cheers, Chris.

[John Fitzgerald]

Is Cotts1 physical or optical?  If physical it can be a real discovery if not in the WDS catalog. 

[c2m2t]

Hi John!

I think Dave is whimsically entertaining the possibilities...at least that is my interpretation of his post!  Therefore, the "??" in my image label.

 

Cheers, Chris.

[flt158]

Hello, gentlemen. 

 

I just wish to add I can see Cotts 1 in Chris's first image of STF 1309. 

 

But only when I click on his image to make it more zoomed in. 

 

Very best regards from Aubrey. 

[payner]

Yes, if I click on Chris' image it appears. Take a look.

 

Best,

Randy

[Cotts]

OK I did see it... 

 

Is Cotts1 physical or optical?  If physical it can be a real discovery if not in the WDS catalog. 

I found TYC 0229-2157-1 in Simbad - Proper motion in milliarcsec/year, -7.835 +4.337

 

But the second star is Gaia 57748721942300448 which i can't seem to look up or find in the Gaia DB.  Does anyone know how to do?

 

Dave

[Cotts]

Hi Mark!

 

I would hope that my image is matching what the CdC is showing...I am through 60% of a 5000 system list and I'll be darned disappointed if they didn't match!! Don't want to appear mis-informed here...but what the heck is "CdC"?? I don't recognize that acronym!!

 

Cheers, Chris.

CdC = Cartes du Ciel

 

Dave

[Cotts]

Did a little digging in the WDS.

 

IF I have a 'discovery' it will have to be called CTL 1.

 

Because

 

I'm in the WDS list of Discoverer codes!!!   Ref my published measures in JDSO 13, 604, 2017.....

 

I didn't even know until just now.....

 

Yay.

 

Dave

[c2m2t]

Hi Dave!

Thanks for that. I am familiar with Carte du Ciel...have never referenced it by the acronym. Just a bit wiser now !

 

Cheers, Chris.

[R Botero]

Hooray! 

Did a little digging in the WDS.

 

IF I have a 'discovery' it will have to be called CTL 1.

 

Because

 

I'm in the WDS list of Discoverer codes!!!   Ref my published measures in JDSO 13, 604, 2017.....

 

I didn't even know until just now.....

 

Yay.

 

Dave

[flt158]

If ever they was anyone who deserves to have discovered a double star it has to be Mister Dave Cotts!!

 

All the best from Aubrey. 

[Cotts]

Well, to be fair, I haven't discovered anything yet.  Just published  some measures in JDSO....

 

If someone could help me get the proper motion data for Gaia 57748721942300448 to see if it is the same as the other one.......

 

Dave

[c2m2t]

Good Morning!!

I just happened to be processing an image of a system in Virgo this morning, from June 2010...early on in my double star imaging adventure. It has a very similar feel to STF 1309 but with a few additions. We have a wide Struve pair with a faint (not as faint as Cotts 1) placed just a bit further away but this time to the southwest. The added bonus, if you swing back south and a wee bit east from this dimmer uncatalogued pair, a nice arc from STF 1644, you will arrive at another non-physical pair catalogued as FOX 175, a brighter, wider pair than STF 1644. 

 

For those of you with some big optics and above average conditions, look for a smudge immediately northwest of FOX 175B. This is  the mag. 13.44 spiral galaxy, UGC 7557.

 

The data:

STF 1644 - 9.24, 9.90 - 19"@ 239d

FOX 175  - 8.35, 10.14 - 62.2"@ 320d

 

Cheers, Chris. 

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[c2m2t]

Folks!

The image has been severely compromised by the site so I attach an image from SDSS.

 

Cheers, Chris

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[mccarthymark]

Here's the data for your A (#1) & B (#3) from Gaia EDR3 via Vizier.  

 

 

 

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[Cotts]

Here's the data for your A (#1) & B (#3) from Gaia EDR3 via Vizier.  

Thanks, Mark.  The PM's are very different, eliminating the possibility of a true binary...

 

Dreams are free, though..

 

Dave

[fred1871]

Dim very wide pairs are mostly optical. No great surprise that the PM numbers show Cotts 1 to fall into the optical box. I've come across a lot of these, often enough in the field of a catalogued pair, and decided early on - after checking PM numbers for quite a few - to not get too excited with seeing yet another one. Reading some of the older papers by various double star specialists back in the days of visual observing with large refractors, they comment often enough on the field doubles that they don't regard as potentially interesting.

 

Aitken's work on the parameters of what's worth cataloguing as a double was discussed here on CN some years ago. His paper on the matter, which includes the views of most of the notable doubles specialists in the early 20th century, still makes interesting reading. The reference is 1911 AN 188 281A (AN is Astronomische Nachrichten).

[Fiske]

Did a little digging in the WDS.

 

IF I have a 'discovery' it will have to be called CTL 1.

 

Because

 

I'm in the WDS list of Discoverer codes!!!   Ref my published measures in JDSO 13, 604, 2017.....

 

I didn't even know until just now.....

 

Yay.

 

Dave