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Astrophotography and Sketching >> Sketching

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lunar
Carpal Tunnel


Reged: 07/03/10

NGC 3998, NGC 3990, & MCG+09-20-046 new
      #4578030 - 05/12/11 07:36 PM Attachment (49 downloads)

A small triplet of galaxies that lies close to the recent supernova in NGC 3972. The galaxy on the left, NGC 3998, was brightest, and had some mottled brightness and a bright core. The galaxy to the right, NGC 3990, was somewhat dimmer, yet elongated in appearence. The central galaxy was really dim. It definately did seem like there was a brightening between the other two though, so I recorded it.

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JayKSC
Carpal Tunnel
*****

Reged: 01/01/05

Loc: Florida
Re: NGC 3998, NGC 3990, & MCG+09-20-046 new [Re: lunar]
      #4578065 - 05/12/11 08:00 PM

Congrats on nabbing this trio of galaxies - I'm especially impressed that you were able to glimpse the MGC+09-20-046. I wonder what the magnitude is on this one and its surface brightness? Thanks for sharing your great sketch of these galaxies - it makes me want to go galaxy observing, but that's a no go given abundant thin clouds here and my urban sky.

- Jay
South Florida


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lunar
Carpal Tunnel


Reged: 07/03/10

Re: NGC 3998, NGC 3990, & MCG+09-20-046 new [Re: JayKSC]
      #4578209 - 05/12/11 09:22 PM

Thanks Jay! Bty the way, I looked up some information on MGC+09-20-046, and it turns out it's pretty bright! Overall magnitude being 11.8, though I unfortunately couldn't find a surface brightness. It's apparent size also seems to be about 1.5'x1.2', one of the smaller galaxies I've recorded.

I hope you do get a chance to get out and observe some of these galaxies! I love it when Ursa Major is near-zenith, there's so many galaxies to check out it's unbelievable.

Clear Skies,
Brandon Doyle


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JayKSC
Carpal Tunnel
*****

Reged: 01/01/05

Loc: Florida
Re: NGC 3998, NGC 3990, & MCG+09-20-046 new [Re: lunar]
      #4578337 - 05/12/11 10:39 PM

Many thanks for that information, Brandon. With its tiny size, this galaxy's surface brightness can't be that much below its listed magnitude. Curious that it lacks an NGC or IC number, to me. I was just at a darker sky site last weekend and was prowling some Draco galaxies. The Ursa Major area is my favorite for galaxies, as it's pretty easy to navigate with star-hopping (compared to the Virgo cluster region!), and has many bright but obscure targets.

- Jay
South Florida


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JakeSaloranta
Pooh-Bah


Reged: 09/18/08

Loc: Finlandia
Re: NGC 3998, NGC 3990, & MCG+09-20-046 new [Re: JayKSC]
      #4578642 - 05/13/11 03:19 AM

Jeez guys, did you even look at the sketch?

First of all, the drawing shows a third galaxy between NGC 3990 and NGC 3995 where there actually is none! There is a magnitude 14.6 star there but definitely not a diffuse, concentrated galaxy like presented in the sketch.

Second of all, MCG +09-20-46 = NGC 3990!


/Jake


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niteskystargazer
Carpal Tunnel
*****

Reged: 10/05/09

Loc: 41-43'-28" N 87-42'-39" W
Re: NGC 3998, NGC 3990, & MCG+09-20-046 new [Re: lunar]
      #4579071 - 05/13/11 10:26 AM

Brandon,

Nice sketch of NGC 3998, NGC 3990 & MCG+09-20-046 .

CS,KLU,

,

Tom


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lunar
Carpal Tunnel


Reged: 07/03/10

Re: NGC 3998, NGC 3990, & MCG+09-20-046 new [Re: JakeSaloranta]
      #4579472 - 05/13/11 01:15 PM

Quote:

Jeez guys, did you even look at the sketch?

First of all, the drawing shows a third galaxy between NGC 3990 and NGC 3995 where there actually is none! There is a magnitude 14.6 star there but definitely not a diffuse, concentrated galaxy like presented in the sketch.

Second of all, MCG +09-20-46 = NGC 3990!


/Jake




There definately was a brightening in the field...I'm not sure. It probably was a star, who knows. Star charts of this area of the sky anyone? Deepskylog's chart (the one I used to find the location) shows a galaxy in this position, as well as a listed magnitude, yet no surface brightness. Could this be an error?

Still, there was a birghtening in the field between the two...

And anyways, thanks for the compliments guys, I really appreciate it.

Clear Skies,
Brandon Doyle


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Jef De Wit
Carpal Tunnel


Reged: 03/06/09

Loc: Hove, Belgium
Re: NGC 3998, NGC 3990, & MCG+09-20-046 new [Re: lunar]
      #4579545 - 05/13/11 01:49 PM

Quote:

There definately was a brightening in the field



Brandon, I guess you saw the two faint stars between the two galaxies as a "galaxie". Have a look at the DSS image on http://www.messier45.com/cgi-bin/dsdb/dsb.pl?str=ngc+3990


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IVM
scholastic sledgehammer


Reged: 01/07/08

Loc: Western New York
Re: NGC 3998, NGC 3990, & MCG+09-20-046 new [Re: Jef De Wit]
      #4579828 - 05/13/11 03:40 PM

I like this galaxy pair and will now be on the lookout for that double star appearing nebulous a la M40. It is also interesting that in this view the orientation of the smaller companion is different from that on the photo.

Such detailed, excellently documented, and "visually honest" observations are a delight. Thanks for posting, Brandon.

My journal and memory record no elongation whatsoever and no bridge of any kind (nebulous or otherwise) either through my 4" or my 16" (through the latter just last week).

According to Wikisky, the two stars in question have magnitudes 14.9 and 16.8. Given their proximity and superposition on at least the "official" halo of NGC 3998, the nebulous appearance could indeed be expected, but any kind of presence there would require special attention to detect. Nice to learn more about this Herschel field.

Edited: I just checked NED and it turns out that the range of distance estimates for the two galaxies is actually pretty solidly overlapping, i.e. it is quite possible that they are indeed companions, same as they appear on the sky!

Edited by IVM (05/13/11 03:48 PM)


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lunar
Carpal Tunnel


Reged: 07/03/10

Re: NGC 3998, NGC 3990, & MCG+09-20-046 new [Re: IVM]
      #4580126 - 05/13/11 07:00 PM

Thank you for the compliment, I really mean it. I try to keep as much accuracy to my sketches as possible, no matter what I see in the eyepiece. It seems as though these double stars could have produced the brightening in the field that was recorded. To my mistake, I recorded this "brightening" as a galaxy on a star chart that, in reality, didn't exist. I'm fairly surprised that such a mistake could be made. It's odd how a faint double and a non-existant galaxy would share the same place in the sky, but it explains my mistake. Thank you for the help here, and solving such a mystery. I'll be sure to pay close attention as to not allow such an event happen again (hopefully) . These unresolved stars could potentially obstruct and send sketches into disarray.

Thanks!
Brandon Doyle


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Jef De Wit
Carpal Tunnel


Reged: 03/06/09

Loc: Hove, Belgium
Re: NGC 3998, NGC 3990, & MCG+09-20-046 new [Re: lunar]
      #4580955 - 05/14/11 08:58 AM

Brandon, everybody learns from his mistakes! And that's great about CN: other observers controling your work. I once sketched a galaxie that was impossible to see with my 8 cm refractor...

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Wil2010
super member


Reged: 08/17/10

Loc: Millville, CA
Re: NGC 3998, NGC 3990, & MCG+09-20-046 new [Re: Jef De Wit]
      #4581048 - 05/14/11 10:00 AM

Brandon.

First of all, your sketches are amazing and wonderful representations of objects in the night sky

Imagine how Messier , Galileo , and all those early astronomers saw the heavens, and represented what they saw in the eyepiece. They didnt have the internet, computer models or deep space atlases to let them know if what they are seeing is correct...or not.

I appreciate that you sketch what you see through your eyepiece..thats how great discoveries are made. So you should be proud, you are now in an elite club of astronomers who made wonderful observations, that over time, may not have been 100% accurate, but unlocked the imagination and spirit of discovery within others.

Keep up the wonderful work..

WiL


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lunar
Carpal Tunnel


Reged: 07/03/10

Re: NGC 3998, NGC 3990, & MCG+09-20-046 new [Re: Wil2010]
      #4581766 - 05/14/11 05:04 PM

Thanks Wil, I really appreciate the compliments and what you said

Clear Skies,
Brandon Doyle


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CarlosEH
Postmaster
*****

Reged: 01/19/05

Loc: Pembroke Pines, Broward County...
Re: NGC 3998, NGC 3990, & MCG+09-20-046 new [Re: lunar]
      #4583461 - 05/15/11 03:24 PM

Brandon,

An excellent observation of this interesting group of galaxies. You recorded some nice detail over the core of NGC 3998. Thank you for sharing it with us all.

Carlos


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lunar
Carpal Tunnel


Reged: 07/03/10

Re: NGC 3998, NGC 3990, & MCG+09-20-046 new [Re: CarlosEH]
      #4583501 - 05/15/11 03:57 PM

Thanks Carlos, and I'll be sure to post future observatins of this group, as well as many others for you guys to see.

Clear Skies,
Brandon Doyle


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lunar
Carpal Tunnel


Reged: 07/03/10

Re: NGC 3998, NGC 3990, & MCG+09-20-046 [Re: lunar]
      #4595228 - 05/21/11 11:11 PM

I recently went back to view these objects while I was in the area viewing NGC 3972 and SN2011by, and I did indeed confirm that I had seen a brighter patch between the two outer galaxies in the group. While paying closer attention I could make out a point of light bouncing in and out of the field due to seeing. It was the brighter member of double stars that sit there.

Clear Skies,
Brandon Doyle


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