[AZ-Observing] Re: Observation Report from Friday Night, July 20
- From: "bobe at ngcic.org" <bobe@xxxxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Sun, 22 Jul 2001 11:49:02 -0700
Hi Chris,
I poked around in Dr. Harold Corwin's NGC precise positions list (
http://www.ngcic.org ) and came up with the following:
NGC 6857 19 59 52.5 +33 23 09 HCds DN (called PN in
some lists).
The RA & DEC, in this case is Equinox B1950.0, and not J2000. Apparently,
it is some type of difuse nebula. Digging a little deeper, using Wolfgang
Steinicke's database (being melded into the NGC/IC Project's database)
yields:
Desig Const RA DEC Mag Size
Type Designations
Comments
----------------------------------------------------------------------------
-----------------------------------------------------------
NGC 6857 CYG 20 01 48.0 +33 31 30 11.4 0.63 EN
PK 70+1.2 Sh2-100 not a PN
These coordinates are Equinox J2000. It indeed does have a PK designation,
but it also has a Sharpless designation as well (Sh2-100), and Wolfgang
explicitly claims that it is not a planetary nebula, but an emission nebula.
This is probably one of several objects which started out with a PK
designation and later found to be something other than a planetary nebula.
Hope this helps
/Bob
---------------------------------------------------------------
"I do not feel obliged to believe that the same God who has
endowed us with sense, reason, and intellect has intended us
to forgo their use." - Galileo Galilei
---------------------------------------------------------------
Bob Erdmann - Core Team Member & Webmaster
The NGC/IC Project - http://www.ngcic.org
e-mail: bobe@xxxxxxxxx
----- Original Message -----
From: "Chris Adamson" <adamsonfamily@xxxxxxxx>
To: <AZ-Observing@xxxxxxxxxxxxx>
Sent: Sunday, July 22, 2001 11:23 AM
Subject: [AZ-Observing] Observation Report from Friday Night, July 20
>
> At close to the last minute on Friday night (8pm), five of us decided to
> drive 90 minutes or so to Eagle Eye. Around 10:30 when fully set-up, it
> seemed well worth it. Skies were very dark and seemingly transparent
> (except the light dome from Phx to the SE) and seeing was reasonable.
> Unfortunately, after a couple hours, high spotty clouds moved in ruining
the
> balance of the night. As did a lot of flying insects! Accomplished my
> objective anyway, bagging the last 3 objects for the EVAC200 and getting
> some great views of Comet C/2001 A2 LINEAR.
>
> One question from this session that maybe Tom or someone can answer.
Night
> Sky Observers Guide (and my observational guess, see below) show NGC6857
as
> an Emission Nebula that looks like a planetary. Both the Sky, the
Lorenzin
> DB and the EVAC 200 list call it a planetary. What is it?
>
> DATE/TIME (UT) : 05:30 to 08:00, July 21
> LOCATION: Eagle Eye site N 33 45.200 W 113 16.667
> SEEING: Early 5/10. I did not really test any close doubles to
> get more specific here. Went down hill fast later in the night.
> TRANSPARENCY: Early 6 out of 10 (please note this is a relative scale for
> these sites within 90 minutes of Phx). Estimate limiting mag 6+. Did not
> really search out the limit telescopically. Went down hill fast later in
> the night.
> WEATHER: 90's
> EQUIPMENT: 16" StarMaster
>
> Exact object stats listed (mag, surface brightness and size) are from the
> Sky and/or The Night Sky Observers Guide (SB is surface brightness).
> --------------------------------------------------------------------------
--
>
> Comet C/2001 A2 LINEAR, in Pegasus, is still visible to the naked eye
> without too much trouble (estimate mag 6, maybe slightly brighter). The
> best view was in the Pronto with 31 Nagler. The tail stretched somewhere
> between a quarter and a third of the field, making it about a degree and a
> half long. The tail seemed to be slightly offset from the sharp nucleus
> (which in itself was surrounded by a large fuzzy cloud). At the time of
> observation, it somewhere around RA21h38m46s, Dec +18d46'21".
>
> NGC6811 Open Cluster in Cygnus (Cr402) is an interesting cluster in a
rather
> rich star field. No particular star stands out due to color or brightness
> difference, but there are many chains and asterisms that you can have fun
> with. At 66x, two of the circular asterisms to the NM and SE almost look
> like spectacles with a bridge of stars to the north or, to use how my 6
year
> old would likely describe it, Mickey Mouse ears! At 118x, it looks nicer
> and better defined. Almost a starfish pattern (or bird with wings spread)
> due to some obvious dark lanes that criss-cross through it (literally an
> 'X"). Mag 6.80, BR 9.88v, Size 13', Tr Type IV 3 p (not well detached
from
> surrounding star field, large brightness range, poor in richness: I
> disagree with the 3 and p!). RA 19h38m16s, Dec +46d34'14".
>
> NGC6857 Emission Nebula in Cygnus (H144) is an outstanding object that you
> should check out. It looks very much like a planetary with a central
star.
> The Sky and the Lorenzin DB call it a planetary, but NSOG has it as an
> Emission Nebula. At 287x, it is somewhat faint, sitting within a
> quadlateral of four stars from magnitude 12 to 13.5 (actually slightly
> offset to the SE star, which is the dimmest). The Ultrablock looks it
look
> even more like a planetary. It gets thicker and wider, giving it more
> definition and allowing it to stand out more. The 13th magnitude
'central
> star' still stands out easily. An outstanding and rich field all in all.
> Mag ?? (maybe about 12 or so, though surface brighter would be lower),
size
> apprx 50", RA 20h01m58s, Dec +33d31'16".
>
> NGC7008 Planetary Nebula in Cygnus (H192). Another outstanding and
> interesting object that you should check out. The central star, at
> magnitude 13.2, is solid with direct vision. Another star (or is it two)
> sits on the shell. The shell itself has in interesting and string double
> knot on the north end, and seems to disappear on the southeast side. The
> O-III really brightens the knots and makes it easier to see them as two.
> One of the more interesting looking planetaries I have seen. A couple
very
> faint stars are just to the west. A very nice contrasting double is on
the
> south end, one almost blue, the other gold, both around magnitude 9 and
10.
> 287x and 402x. Mag 13.0 (NSOG says 10.7v), size about 86"x69", CS 13.2v,
> Type 3 (Irregular disk). RA 21h00m40s, Dec +54d33'15".
>
> I spent a long time looking for IC5076 in Cygnus, as I did last week (the
> last open item in my EVAC list). After not finding it again, I decided
this
> must have been a mistake in the EVAC list. IC5067, the Pelican Nebula, is
> real close to IC5076, and I am now assuming that is what was meant.
IC5076
> would otherwise seem to be an extremely difficult challenge, much more so
> than anything else on the list.
>
> I looked around at a few other things, none seriously, but the weather and
> bugs put an end to the session.
>
> Thanks,
> Chris
>
>
>
>
>
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