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Old 16-02-2016, 02:06 PM
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ngcles
The Observologist

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Location: Billimari, NSW Central West
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Observing report 6-7th February 2016

Hi All,

Just thought I'd post some observations made from home at Billimari in a session that commenced about 23:00 on the 7th and concluded about 01:30 on the 8th February 2016. All are with my 46cm f/4.9 and conditions were as follows. 18 deg C no wind, cloud or dew. I rated the seeing at 5/10 at the commencement deteriorating to 4/10 near the very end. The SQM-L reading at the commencement was +21.84 and +21.88 at the conclusion.

The objects are all galaxies commencing in Pyxis, then Canis Minor and concluding in Cancer.

x185 27' TF

NGC 2772 Galaxy *
RA: 09h 07m 41.7s Dec: -23 37' 03"
Mag: 14.2 (P) S.B.: --- B-V: --- Size: 1.5'x0.8' Class: Sb: pec sp
P.A.: 166 Inclination: --- R.V.: --- Source: RC3 *

This is a small but quite elong streak of faint haze. Quite faint and of very LSB 1.75' x 10" in PA 0. The tips of this obviously edge-on spiral eg are very faint and uncertain, brightens along the axis weakly to center where there is a small, weakly brighter elong core area but no apparent nucleus.

x185 27' TF

NGC 2883 Multi-Galaxy Sys *
RA: 09h 25m 18.3s Dec: -34 06' 13"
Mag: 16.0 S.B.: --- B-V: --- Size: 2.7'x0.8' Class: IB(s)m pec:
P.A.: 169 Inclination: --- R.V.: --- Source: RC3 *

On the plate, this is a very peculiar-looking eg. Through the ep it is less interesting. Found to the N of a little group/bunch of mags 13 - 15 *s, it is partly immersed in them. Appears as a slightly unevenly lit and SB splotch with no definite edges 1.25 x 1' in PA 0. SB is low but not too bad, whole think looks weakly blotchy with no brightening trend to center.

x185 27' TF

NGC 2499 Galaxy *
RA: 07h 58m 51.8s Dec: +07 29' 33"
Mag: 14.9 S.B.: --- B-V: --- Size: 1.1'x0.7' Class: SBc
P.A.: 39 Inclination: --- R.V.: --- Source: PGC *

This is an extremely tiny and faint spot of gossamer a couple of arc mins NE of a RA tri of mags 11-12 *s that is only intermittently visible. 10-15" diameter spot of extremely low and consistent SB gossamer.

x185 27' TF

NGC 2513 Galaxy *
RA: 08h 02m 24.7s Dec: +09 24' 50"
Mag: 12.6 (B) S.B.: 13.3 B-V: +0.99 Size: 2.5'x2.0' Class: E
P.A.: 169 Inclination: --- R.V.: +4662 Source: RC3 *

NGC 2511 Galaxy *
RA: 08h 02m 14.9s Dec: +09 23' 42"
Mag: 15.1 (P) S.B.: --- B-V: --- Size: 0.8'x0.3' Class: S?
P.A.: 124 Inclination: --- R.V.: +4467 Source: RC3 *

NGC 2510 Galaxy *
RA: 08h 02m 10.6s Dec: +09 29' 09"
Mag: 14.4 (P) S.B.: --- B-V: --- Size: 1.3'x0.7' Class: S0:
P.A.: 117 Inclination: 3 R.V.: --- Source: RC3 *

Of these three -13 is the brightest while -11 and -10 are nearby, 2.5' SW and 5' NNW respectively.

-13 is a pretty obvious good SB but small eg, 1' diameter or slightly smaller, round growing in brightness broadly and slightly at first, and then moderately to center. Makes a near RA tri about 2.5' a side with 11th & 12th mag *s to the N and NW respectively.

-11 is 2.5' SW and is of similar size, slightly smaller, 40" diameter, round and of lower SB. brightening slightly to center.

-10 is 5' NW and is similar to -11 though 30-40" diameter, mod faint brightening slightly to center with no clear zones or nucleus. Round or possibly off-round in PA 90?

x185 27' TF

IC 494 Galaxy *
RA: 08h 06m 24.2s Dec: +01 02' 14"
Mag: 14.1 (P) S.B.: --- B-V: --- Size: 1.3'x0.6' Class: SA0^:
P.A.: 50 Inclination: 5 R.V.: --- Source: RC3 *

This eg is found about 10' SSE from a mag 8 * that is distinctly yellowish. Small, spiral in about PA 60, of low but reasonable SB growing slightly and broadly to center where there is a small, round, slightly brighter core/nucleus. 40 x 30".

x185 27' TF

IC 498 Galaxy *
RA: 08h 09m 30.2s Dec: +05 16' 49"
Mag: 14.3 S.B.: --- B-V: --- Size: 1.2'x1.1' Class: S
P.A.: 59 Inclination: 1 R.V.: --- Source: PGC *

This eg wasn't immediately visible but is found to the W by 9' from a 9th mag * and it has a little squat "T" shaped asterism of 13th & 14th mag *s to its south. Small, roughly round patch of low SB mist, possible slight elong in PA 90 1 x 50", weak brightening to center with no apparent core or nucleus.

x185 27' TF

IC 2231 Multi-Galaxy Sys *
RA: 08h 11m 01.6s Dec: +05 05' 14"
Mag: 14.4 S.B.: --- B-V: --- Size: 1.4'x1.2' Class: E:
P.A.: 117 Inclination: --- R.V.: --- Source: RC3 *

In a fairly starry field, this is a pretty obvious and has an embedded mag 13.5 * on the W side of the halo. Seems round, 1' diameter or possibly slightly larger grows broadly and slightly to center where there is a small round slightly brighter core-zone though no apparent nucleus. Difficult to gauge the core zone because the distracting * lies just outside it.

x185 27' TF

NGC 2538 Galaxy *
RA: 08h 11m 22.8s Dec: +03 38' 03"
Mag: 13.5 (P) S.B.: --- B-V: -- Size: 1.4'x1.1' Class: (R')SBa
P.A.: 156 Inclination: 2 R.V.: +3944 Source: RC3 *

This is found only and arcmin or so NW of a mag 12 *. Fairly small but straight forward and elong in about PA 30, 50" x 20" occasionally there seems to be a faint stellaring or stellar nucleus at center. Low consistent SB halo with soft edges.

x185 27' TF x247 20' TF

NGC 2843 Galaxy *
RA: 09h 20m 28.8s Dec: +18 55' 34"
Mag: --- S.B.: --- B-V: --- Size: 0.5'x0.2' Class:
P.A.: 52 Inclination: --- R.V.: --- Source: PGC *

This is an extremely difficult object and I am unsure whether this is a bare detection or wishful thinking. Certainly not visible at x185. Think I detected a few times over about 5 mins an ephemeral, tenuous spot of gossamer barely south of a 12th mag * at x247, hardly larger than stellar. Doubtful observation. Steve.

x185 27' TF

NGC 2730 Galaxy *
RA: 09h 02m 15.9s Dec: +16 50' 18"
Mag: 13.5 (P) S.B.: --- B-V: --- Size: 1.7'x1.2' Class: SBdm:
P.A.: 80 Inclination: 2 R.V.: +3830 Source: RC3 *

NGC 2734 Galaxy *
RA: 09h 03m 01.6s Dec: +16 51' 49"
Mag: --- S.B.: --- B-V: --- Size: 0.6'x0.5' Class:
P.A.: 86 Inclination: --- R.V.: --- Source: PGC *

These two form a wide pair with -34 10' E of -30.

-30 is found a little NW of a couple of mag 11.5 *s and forms a small I tri with them. It has a 14th mag * just off the S halo/flank. Seems slightly elong in PA 90, 1.25' x 50". Lowish SB and grows slightly and broadly to center where there appears to be a very small, slightly brighter core/nucleus.

-34 is smaller and near a little bunch of faint mag 14/15 *s stars. Hardly more than a spot of gossamer, possibly 20" diameter with no structure and V/LSB.

x185 27' TF

NGC 2744 Multi-Galaxy Sys *
RA: 09h 04m 39.1sDec: +18 27' 50"
Mag: 13.9 (B)S.B.: ---B-V: +0.44Size: 1.6'x1.0'Class: SB(s)ab: pec
P.A.: 124Inclination: ---R.V.: +3397Source: RC3 *

NGC 2749 Multi-Galaxy Sys *
RA: 09h 05m 21.3s Dec: +18 18' 47"
Mag: 12.7 (B) S.B.: 13.4 B-V: +0.93 Size: 1.8'x1.5' Class: E3
P.A.: 82 Inclination: --- R.V.: +4201 Source: RC3 *

NGC 2752 Multi-Galaxy Sys *
RA: 09h 05m 42.7s Dec: +18 20' 16"
Mag: 14.5 (P) S.B.: --- B-V: --- Size: 2.1'x0.4' Class: SBb: sp
P.A.: 60 Inclination: 6 R.V.: +4022 Source: RC3 *

NGC 2747Galaxy *
RA: 09h 05m 18.3s Dec: +18 26' 31"
Mag: 15.5 S.B.: --- B-V: --- Size: 0.6'x0.4' Class:
P.A.: 170 Inclination: --- R.V.: --- Source: PGC *

NGC 2751 Mult-Galaxy Sys *
RA: 09h 05m 32.4s Dec: +18 15' 43"
Mag: 15.0 S.B.: --- B-V: --- Size: 0.9'x0.6' Class: Sbc
P.A.: 138 Inclination: --- R.V.: --- Source: PGC

NGC 2745 Galaxy *
RA: 09h 04m 39.3s Dec: +18 15' 26"
Mag: 15.4 S.B.: --- B-V: --- Size: 0.6'x0.5' Class: C
P.A.: 179 Inclination: --- R.V.: --- Source: PGC *

-44, -49 and -52 are the three brightest of this group, the other thre are extremely small and very faint spots of gossamer.

-44 is pointed at from the N by a wide mags 11 & 12 pair a few arcmins away. Not too bad, about 1' diameter, off-round in PA 135 1' x 50", growing broadly and slightly to center. There is a 14th mag * just outside the visible halo in the E. Occasionally seems there is a threshold magnitude stellaring nucleus. -49 is 12' SE.

-49 is an obvious, 1.2' round eg that is of good SB growing broadly and slightly to center where there is a small mod brighter almost stellar core/nucleus. 6' NE is -52.

-52 is pointed at from the NW by an evenly spaced line of three similarly bright mags 11 *s that is 5' long. A LSB spindle shaped sliver of mist 1.25' x 0.1' in PA 60, growing weakly in brightness along the axis to center but has no apparent core/nucleus. At the other end of the line of 3 mags 11*s is -47, found in the position where a 4th star would be.

-47 is an extremely faint and extremely LSB spot of 10" dia gossamer only occasionally detected.

-51 is 4' SE of -49 and almost superimposed on a 13th mag *. Slightly easier than -47 but still a very tiny spot of gossamer no structure.

-45 is 10 SW of -49 and is intermittently visible as an almost stellar spot of gossamer, better than -47 but dimmer than -51.

x185 27' TF

NGC 2764 Galaxy *
RA: 09h 08m 17.5s Dec: +21 26' 39"
Mag: 13.6 (B) S.B.: 12.0 B-V: +0.76 Size: 1.5'x0.8'
Class: S0: P.A.: 15 Inclination: ---R.V.: +2597Source: RC3 *

This eg is found almost directly between stars of mags 10.5 and 11.0 sep by 5' running almost N-S (the line is in about PA 170). Eg is elong in PA 15, 1.25' x 30" with fair S.B brightens broadly and slightly along the axis toward center but there is no apparent core or nucleus.

x185 27' TF

NGC 2592 Galaxy *
RA: 08h 27m 08.2s Dec: +25 58' 14"
Mag: 13.3 (P) S.B.: --- B-V: --- Size: 1.7'x1.4' Class: E
P.A.: 45 Inclination: --- R.V.: +1989 Source: RC3 *

NGC 2594 Galaxy *
RA: 08h 27m 17.2s Dec: +25 52' 44"
Mag: 14.9S.B.: ---B-V: ---Size: 0.8'x0.5'Class: L
P.A.: 43Inclination: --- R.V.: --- Source: PGC *

-92 is the major member of this pair and is fairly bright and forms an I tri with a couple of *s 11th mag to the SE and S 6-7' away. About 1.25' diameter, round, with a small round bright core nucleus. There is a 14th mag * at the edge of the halo W.Not hard to see, goodish SB. -94 is 0.5' N of the 11th mag * S of -92.

-94 is an extremely faint spot of gossamer intermittently visible just N of the star. E/LSB and tiny, almost *ar.

Best,

L.
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  #2  
Old 16-02-2016, 09:18 PM
ausastronomer (John Bambury)
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Hi Les,

Nice report. You had a busy night.

I can confirm your observation of NGC 2843, it sounds good to me. I find it is on the verge of visibility in an 18" scope under good conditions at about 250x. I have had the luxury of being able to confirm the observation with an adjacent 25"/f5 where it is comfortably visible with averted vision at lower powers. It's pretty small in that aperture.

Cheers
John B
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Old 17-02-2016, 10:59 PM
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pgc hunter
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Great Obs Les and good to see you posting again! That sound like some near damn perfect skies. That's a productive session for 2 hours, let me guess, Argo Navis?
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  #4  
Old 18-02-2016, 07:16 AM
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ngcles
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HI SAb

Quote:
Originally Posted by pgc hunter View Post
Great Obs Les and good to see you posting again! That sound like some near damn perfect skies. That's a productive session for 2 hours, let me guess, Argo Navis?
Yep, Argonavis. Wouldn't be without DSC. I can find just about anything in the sky the "old fashioned way", but good DSCs mean I spend all my time looking through the ep rather than the finderscope.

It is an excellent site and living here means It takes me all of 7-8 minutes from start to observing. There is a website here:

http://www.lightpollutionmap.info/#z...yers=B0TFFFTTT

where SQM and SQM-L users can record their readings all around the globe. If you find the town of Orange in NSW, then Canowindra to the South, my home is about midway between Gooloogong and Billimari where there are lots of little black dots. That's me. On Moonless nights I normally obtain a reading around the 21.9 to 22.0 mags/arcsecond^2 mark at zenith. The best reading so far is 22.23 with several in the 22.1 to 22.2 bracket.

In summary, it is a deep sky observers paradise.

Best,

L.
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Old 18-02-2016, 07:32 AM
N1 (Mirko)
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Quote:
Originally Posted by ngcles View Post
On Moonless nights I normally obtain a reading around the 21.9 to 22.0 mags/arcsecond^2 mark at zenith. The best reading so far is 22.23 with several in the 22.1 to 22.2 bracket.
Those are mighty good readings. Up there with the very best.
You must be benefitting from very low humidity.
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Old 18-02-2016, 04:54 PM
Bombardon (Eugene)
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Thank you ngcles for posting such a detailed report. Even though most of the objects are beyond my reach,I appreciate reading what other people are finding and their comments are inspiring - especially on these brilliant moonlit nights when my backyard is illuminated by such mystically light and all denizens of the dark have scurried indoors . I intend to research some objects on your list and attempt to line some up for when my ancient cobweb laden 16" comes out of the shadows on what now becomes rare visits. Keep up these reports and thank you for sharing such a great night.
Regards, Eugene
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  #7  
Old 22-02-2016, 07:55 PM
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Paddy (Patrick)
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Great to read your report Les. Some very impressive obs of some very faint objects!
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