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Old 09-01-2011, 11:05 PM
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barx1963 (Malcolm)
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Observing Report 5/1/11 to 7/1/11

Here are the rest of my observations made in the last week

Observations 5/1/11

NGC 2069 Emission Nebula in Dorado
RA 05 38 30 Dec -69 05 00 Dim’ 18x11 Type E
Appear as an elongated arm of nebulosity to N of NGC 2070 (Tarantula Nebula in LMC). Appear to be separated from main body of NGC 2070 and to have dark lanes running either side of it. A faint star appears at north end though this may be a patch of brighter nebulosity. 2 other faint stars straddle the south end. Object is fairly bright and UHC filter improves view. Shape is sometimes hard to describe. Appear almost leaf shape when using direct vision but takes on a more triangular shape with averted vision, suggests that faint areas either side of the South end are easier seen with averted vision.

NGC 2060 Open Cluster assoc. with nebulosity in Dorado
RA 05 37 48 Dec -69 1018 Diam’ 2 Type cl (Open Cluster)

Knot of nebulosity on SW side of NGC 2070. Roughly circular, some stars associated with this area which is open cluster. 2 stars are prominent and bright, 2 other stars are just visible.

NGC 1637 Galaxy in Eridanus
RA 04 41 28.5 Dec -02 51 17 Mag(V) 10.8 Dim’ 3.3x2.7 SB 13.1 Type SAB(rs)c II

From Beta Eridani move 6deg slightly N of p to a wide triangle formed by Mu Eridani, Nu Eridani and 51 Eridani. Galaxy lies halfway between Mu and 51. Fairly large, roughly aligned NS. Dark lane mentioned in DSFG was not glimpse. Maybe suggestion of a bar. Faint star at N end

Notes added post observation. Image at http://spider.seds.org/ngc/ngcdss.cg...5&f=GIF&c=none shows a dark area to N and NE of core which agrees with DSFG description, but this was not possible to see visually.

NGC 1600 Galaxy in Eridanus
RA 04 31 39.9 Dec -05 05 10 Mag(V) 10.9 Dim’ 2.5x1.7 SB 12.5 Type E3

Nu Eridani has a mag 6 star 20’ to S. This points at a mag 6.5 star 2deg S and slightly p. An isosceles triangle of mag 7.5 stars lies 25’ to p. Just p of f star a faint glow can be detected. No obvious structure as expected for an elliptical galaxy. Almost a stellar core. NGC1601 and NGC1603 are associated but too faint to be seen.


Observations 7/1/11

NGC 986 Galaxy in Fornax
RA 02 33 34.3 Dec -39 02 35 Mag(V) 10.9 Dim’ 3.9x3.0 SB 13.4 Type SB(rs)ab II

From Iota Fornici a pair of mag 6 and 6.5 stars lie 1deg to N about 1deg apart aligned EW. From p star of this pair move just over 1deg to Sp past a mag 7.5 star to a pair of mag 9 stars. Target lies just N of N star. Easy to identify, little concentration, brighter parts are aligned roughly NS core looks elliptical.

Collinder 69 Open Cluster in Orion
RA 03 39 00 Dec +09 56 00 Mag 2.8 Diam’ 70 No of Stars 20 Type cl (Open Cluster)

The “head” of Orion or the Lambda Orion Cluster. Brightest stars are Lambda and Phi1 and Phi2 Orionis. Overall cluster is very large. More than filling FOV at 44x. Lambda and Phi1 have a pretty line of 3 stars running between them. Large number of cluster stars on f side. Lambda Orionis is a nice double star (Struve 738) just separated by a whisker at 67x and easy at 115x. Two fainter stars mag 10 and 11 are also clearly seen.

NGC 1981 Open Cluster in Orion
RA 05 35 12 Dec -04 26 00 Mag 4.2 Diam’ 28 No of Stars 20 Mag Brightest Star 10.0 Type cl (Open Cluster)

Bright open cluster at N end of Orion’s sword. Forms 2 triangles both pointing S. The star at Nf corner is a fairly easily split double (Struve 750)

Collinder 72 Open Cluster in Orion
RA 05 35.4 Dec -5 55 Mag 3.1 Diam’ 15

Arm of nebulosity sweeps to Nf from trapezium to bright Iota Orionis (Struve 752 which is an easy separation at 67x). Cluster is fairly large with several bright stars. Is associated with nebulosity usually known as NGC 1980. The DSFG lists NGC as both an emission nebula and an open cluster.
From what I can gather NGC 1980 only refers to the nebulosity and the cluster is correctly refered to as Collinder 72.

NGC 1977 Emission and Refection Nebula in Orion
RA 05 35 30 Dec -04 52 00 Dim’ 20x10 Type E+R BC 1-5 Colour 1-4

Just S of M43, about 1 low power field from Trapezium is a line of 3 stars forming a very obtuse triangle. The 2 outer stars of this line are brighter than the inner one. Another line of 3 fainter stars lies just to p. Nebulosity is around these stars and extends to S. Let eye drift S from M43 until it perceives a brightening (focus must be sharp!) A nebula filter allow the nebula structure to contrast with the dark structure which forms the “running man” for which this object is famous. Brightest part of the nebula is the extensions to the Np. Have observed this over several nights and each view improves detail.

NGC 1999 Emission Nebula in Orion
RA 05 36 30 Dec -06 42 00 Dim’ 2x2 Type E BC 1-5 Colour 1-4

From Iota Orionis a narrow 45’ long isosceles triangle points Sf. S star is mag 6, faint pair of mag 8 stars to Sp, target is about 15’ to p of these. Moderately bright small nebula, at 115x appears just larger than stellar with an outer envelope. Could be mistaken for a small globular. UHC Nebula filter has some effect at 115x. There is a dark structure which is clearly shown in DSS image (see http://spider.seds.org/ngc/ngcdss.cgi?obj=NGC!1999&r=5:36.5&d=-06:42&e=J2000&h=19.2&w=19.2&f=GIF&c =none ) but couldn’t be made out.

Malcolm
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Old 10-01-2011, 06:18 PM
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Thanks for posting your obs Malcolm. Interesting to hear of the effectiveness of filters on the running man, being a reflection nebula the filters should 'ruin' the view. Or does it contain some emission NGC 1999 is an interesting object, I know for sure that in a 12" the dark globule is visible, but it is low contrast and the glare from the associated star makes it a challenge. Use 300-500x. I have seen it on one occasion with a 10" hopefully this crappy weather will bugger off so I can give it another go.

cheers
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Old 10-01-2011, 08:38 PM
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barx1963 (Malcolm)
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Thanks Sab
NGC 1977 is listed as both emission on reflection in my data (Uranometria 2000 Deep Sky Field Guide) so the Neb filter definately had an effect. Give it a try and see what you think!
Tried for about 10 mins to get the dark featue in NGC 1999, varied the power, tried with and without barlow, tried the neb filter. Even tried sitting still for a few minutes breathing deeply to increase oxygen flow to my brain! Still couldn't see it, about the only thing I didn't try was an OIII filter, but that shouldn't work so didn't bother.

Malcolm
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Old 10-01-2011, 09:33 PM
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Paddy (Patrick)
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Two very interesting reports Malcolm. Some very nice descriptions and, as Suzy says, the post observing notes are very interesting. And as always, some things to put on my growing list of things to look at. I went ot look at my own notes for NGC 2069 and realised I haven't done any - I'd better get onto it! 2060 is one of my favourite bits around 2070, along with 2074. Both are very delicate combinations of nebulosity and stars - I tend to see a horseshoe shape in 2060.

A very good read.
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Old 10-01-2011, 10:53 PM
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Nice detailed report Malcolm. I really enjoy the extra details you put in, something for me to aim for.
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Old 11-01-2011, 10:45 AM
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Quote:
Originally Posted by barx1963 View Post
Thanks Sab
NGC 1977 is listed as both emission on reflection in my data (Uranometria 2000 Deep Sky Field Guide) so the Neb filter definately had an effect. Give it a try and see what you think!
Tried for about 10 mins to get the dark featue in NGC 1999, varied the power, tried with and without barlow, tried the neb filter. Even tried sitting still for a few minutes breathing deeply to increase oxygen flow to my brain! Still couldn't see it, about the only thing I didn't try was an OIII filter, but that shouldn't work so didn't bother.

Malcolm
I'll be sure to give the filters on NGC 1977 a go! Assuming Orion doesn't leave the evening sky by the next clear moonless night Maybe Les can chime in with some more data?

From your location, NGC1999's dark feature should be pretty easy. What's your highest magnification you tried on NGC 1999? There are sketches of the object and the observers all seem to use well over 300x, some as high as 600x. Size is given as 2'x2' on NGC IC project, so quite small (and the dark feature will be much smaller yet) so I think some high mag is in order.
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Old 11-01-2011, 12:17 PM
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barx1963 (Malcolm)
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I only went to 230x which is my 13mm Nag with a 2x barlow. I also tried 187x with an 8mm Orion Stratus, but view was not goos so didn't bother barlowing it. I know I needa good ep in the 5-6mm range, just ahven't decided what I want to get. What do you use for the higher powers in your 12"?
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Old 11-01-2011, 12:51 PM
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Quote:
Originally Posted by barx1963 View Post
I only went to 230x which is my 13mm Nag with a 2x barlow. I also tried 187x with an 8mm Orion Stratus, but view was not goos so didn't bother barlowing it. I know I needa good ep in the 5-6mm range, just ahven't decided what I want to get. What do you use for the higher powers in your 12"?
230x - that to me sounds sufficient , but the object's small size and low contrast, as the glare from the star, makes it hard if one is not familiar with the object. I wouldn't worry too much about seeing, the smallest detail here is much larger than what the seeing will wash out, so I'd still go 300x +, preferably 400-500x. Nebulous objects such as this are far more magnification tolerant than objects with small details like the planets and small complex planetaries. It'll blow up the object and increase contrast between the neb and the dark globule so you'll have a much better chance of spotting it.

I use 3.5mm and 5mm LVW with 2x and 2.5x barlows in my 12".
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Old 11-01-2011, 08:07 PM
astrospotter (Mark)
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Nice OR on some classics

Yet another real nice OR on IceInSpace. Thanks for sharing.

I believe running man has a bunch of H-Alpha per pics I have taken so I would agree it is reflection and emission.

I am going to post a separate thread not in ORs but in Observational Astronomy so as not to polute these nice ORs. I am also to post there so as not to hijack this great thread and in that post I will discuss a shape I see in tarantula nebula that I wish some of you to think about then of course tell me I'm nuts. (that is also acceptable) Mark

Last edited by astrospotter; 11-01-2011 at 08:09 PM. Reason: Need to change title. That title to be in different area
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