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Deep Sky Observing Report - 2/2/20

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#1 chbrandt

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Posted 03 February 2020 - 03:26 PM

I often search this forum for the very faint objects that I like to go after and very often times find that these objects aren't mentioned anywhere at all on cloudynights!  The best way to fix that is to start reporting on some of them occasionally and see if others have ever seen them.

 

I went out observing after midnight on 2/2/2020, as moon set was 1:08am where I was in Missouri.  Transparency was great (21.48 SQML) and seeing was particularly poor.  I started off the night in Coma Berenices looking at NGC 5056 on the Herschel II Spring list and wrote the following, all at 237x through my 18.5" dob:

 

NGC 5056 - Somewhat bright, clearly elongated N to S, small, bright mag 9 star 3.5' away, some slight brightening near the core, nearby dimmer NGC 5057 seen in the field.

 

From there, I started looking at nearby galaxyies; NGC 5065 and PGC 46284, the second of which was barely visible, but confirmed by a friend observing with me.

 

NGC 5065 - Somewhat dim, dim mag 15 field star very close by, elongated E to W but not clearly so, even surface brightness, somewhat small; smaller, dimmer PGC galaxy in view.

 

PGC 46284 - Very dim, no structure seen, fluttered in and out with averted vision, small.  Listed in SkySafari as magnitude 15.52; calculated afterwards to be ~15.16.

 

From there, I moved slightly NNE into Canes Venatici  and observed a pair of very faint PGC galaxies:

 

PGC 46368 - Very dim, small, no detail seen, paired with a similar sized but dimmer PGC very close by.  Listed in SS as magnitude 15.1, calculated to be ~14.33.

 

PGC 1942784 - Extremely dim, in and out using averted vision only, not seen directly.  Listed in SS as magnitude 15.81, calculated to be ~15.06, but visually appeared slightly dimmer than PGC 46284.  

 

After looking at NGC 5074, also in the field with the above pair, I looked at another very faint PGC:

 

PGC 46377 - Extremely dim, very small, averted vision only, shares field with much brighter NGC 5074.  Listed in SS as magnitude 15.67, calculated to be ~15.00.

 

Lastly, I took a look at ICs 4225, 4226 and 4227, all much brighter than the PGCs listed above before packing up around 4:30am.  I'm curious who else has seen some of these objects and what you were able to see?


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#2 Keith Rivich

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Posted 04 February 2020 - 10:41 AM

That's good challenging stuff! 

 

Some may read your report and think "what the heck is he doing spending time on barely visible DSO's"

 

Its these objects that really build your observing skills. Everyone,  no matter what scope is used, should add a few of these to their observing list. These skills carry over to the bright showpiece objects. 


Edited by Keith Rivich, 04 February 2020 - 02:00 PM.

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#3 sgottlieb

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Posted 04 February 2020 - 06:14 PM

Chris, I went through this field 20 years old with my 17.5" but only as part of my NGC survey.  I picked up PGC 46368 (CGCG 160-180), which you mentioned, as it's so close to NGC 5065.

 

 

NGC 5041: faint, fairly small, irregular round, relatively low surface brightness, 1' diameter, weakly concentrated.  The core appears to be elongated NW-SE within a slightly fainter rounder halo.

 

NGC 5056: Fairly faint, fairly small, elongated 3:2 N-S, broad concentration.  The extensions appeared mottled with a hint of clumpiness.  Two mag 14.5 star are close following with the closer star 1.0' SE of center.  Located 3.3' N of mag 8.8 SAO 63436.

 

NGC 5057: Fairly faint, small, round, 0.4' diameter, very small bright core, stellar nucleus at moments.  Probably viewed the core only (halo very faint on DSS).  Smaller but higher surface brightness as NGC 5056 6' SW.

 

NGC 5065: Faint, fairly small, elongated 4:3 E-W, 0.9'x0.7', pretty smooth surface brightness.  A mag 14.5-15 star is at the north edge [26" from the center].  Follows a wide pair of mag 10/12 stars (SAO 63455) by 5'.  Forms a pair with CGCG 160-180 2.8' SW.

 

CGCG 160-180 = PGC 46368: Extremely faint and small, round, 15" diameter.


Edited by sgottlieb, 04 February 2020 - 08:24 PM.

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#4 Bigzmey

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Posted 12 February 2020 - 09:56 PM

Nice haul there! When you say "calculated to be ~15.00", how do you calculate?


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#5 chbrandt

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Posted 14 February 2020 - 11:57 AM

Nice haul there! When you say "calculated to be ~15.00", how do you calculate?

 

Steve Gottlieb pointed me to a formula for converting SDSS magnitudes for stars, but it also seems to work well for 'most' galaxies, provided they have a well defined nucleus.  If you take the green and red values from the SDSS for a galaxy and use this formula, that's how I'm calculating.  Again, not perfect, and very tedious, but not bad to do for a few objects here and there.

 

VM = .4216*g + .5784*r

 

http://skyserver.sds...chart/navi.aspx

 

Chris


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#6 stargzr66207

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Posted 14 February 2020 - 06:10 PM

Chris,

Great observing report!  Your intestinal fortitude is admirable!! I know it was clear that night, but I was worn out after watching

the Chiefs pull out their win in the Super Bowl, followed by all the celebrations and afterparties. (Go Chiefs!).

 

Ron Abbott


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