Saturday, December 27, 2008

Observation December 26, 2008

The 2nd clear night in a row. Transparency is a bit less than yesterday but it’s still OK with nelm of 5.0. It’s however much colder. I guess it’s -4°C., which is doable for a few hours.

Location: Boutersem
Equipment: Obsession18”
Eyepieces: 24mm; 16mm, Powermate 2,5x
Nelm: 5,0
Seeing: moderate
Time 19Hr UT to 24Hr UT

I started with M37, as usually during winter time.
Spend some time looking for the nebula in M45, but except some glare around the brightest stars I could not see any hint of it.
M76 is a fantastic object. Lot’s of details to see, as well as some brightness differences. Could see the brightest part of the outer halo.

Cat’s Eye and IC 4677 – planetary nebula in Draco
Tried to look for IC 4677 which is according to some sources a galaxy, and to other sources a bright patch of the outer shell of the Cat’s Eye. After looking at the DSS picture I’m choosing for the 2nd option. It’s a difficult object in mag 5.0 sky. I have seen it a little while at 211x. It reacts positively to an UHC filter, as now I could see it during 10% of the time.

Now we go for HII objects.

NGC 7419 – open cluster in Cepheus
Small concentrated cluster containing 10 stars in an area of 7’. It’s located in line of 2 bright stars. At 211x 20 stars are visible; many of them are quite faint. Cute little cluster.

NGC 7600 – galaxy in Aquarius
124x: oval smudge of 2’ with a small but bright core. Averted vision required. Visible 50% of time.

NGC 7785 – galaxy in Pisces
124x: This is an easy object. It’s located in the middle of a triangle of 3 bright stars. NGC 7785 is an oval of 2’ and has a faint core.

I did not found NGC 7832, galaxy in Pisces

NGC 23 and NGC 26 – galaxies in Pegasus
NGC 23 is very easy. I can see it with direct vision at 124x. It’s a smudge of 2’ with a bright core. A faint star is located close to the eastern edge. NGC 26, located 10’ SE of NGC 23 is much more difficult. Only 20% of the time visible at 124x. It’s a smudge of 1’. It becomes a bit better visible at 211x.

NGC 125; 126; 128 – group of galaxies in Pisces
NGC 125 is the Herschel II object. With averted vision at 124x it’s a small smudge, smaller than 1’. A nice double star is located south of the galaxy. NGC 128 is a nice edge on galaxy of 3’, with an elongation of 4:1. No core. NGC 126 is difficult. I could only see it a few times at 211x. NGC 127 and 130 were not visible.
Worthwhile to redo!

NGC 151 – galaxy in Cetus
A large object of 3’ but only visible 10% of the time, at 124x. The visibility increases a lot at 211x. NGC 163 which is located SE of NGC 151 was not visible.

NGC 182; 186; 193; 194; 198; 199; 200; 204 – group of galaxies in Pisces
NGC 198 is the Herschel II object. It’s oval an easy to see at 124x. NGC 200, located 7’ north, os a faint large oval of 2’, visible at 211x. No core. Continuing north are more galaxies. NGC 194 is easy to see at 211x. It’s round, 1’ and has a faint core. NGC 199 is more difficult. It’s an oval visible only 20% of the time. More north is NGC 193, an oval galaxy without core close to a faint star. Visible half of the time. NGC 204 is located east of NGC 193 and is also a bit smaller than NGC 193. No core. NGC 186 is more to the west. This oval of 1’ without core is almost continuously visible. 15’ east of NGC 198 is NGC 182, a very faint galaxy. NGC 208, west of the Herschel II object was not visible. NGC 202 and 203 were not on may finder chart, so I did not look for it L

NGC 217 – galaxy in Cetus
NGC 217 is an elongated galaxy of 2’ (elongation 3:1) without core. At 124x it’s visible 80% of time. This galaxy has not yet been observed in dslog.

NGC 315; 311; 318 – galaxy in Cetus
NGC 315 is a an easy object. At 124x it’s round, has core, and is larger than 2’. NGC 311 is also visible at 124, but the core appears only at 211x. Is 1’ long. NGC 318 is a stellar object at 211x located east of a faint star.

Up to here the faint Herschel II objects. It’s time to do something else. I wanted to redo some observations in Auriga.

IC 410 – emission nebula in Auriga
I looked at this one also yesterday. The C-shape is very clear. The C is wider and brighter at its west side. Nice object.

IC 405 – flaming star – Auriga: looked for a while, but could not see any nebulosity, apart from the glare around the brighter stars.

IC 417 – emission nebula in Auriga
Yesterday I was not very sure I have seen the nebula. Today, I still cannot confirm at 100% Maybe I have seen some nebulosity (with UHC) but it’s far from being sure.

NGC 2392 (Eskimo) – planetary in Gemini
I wrote it yesterday that I need to look for the concentric ring within the inner disc. (I also wrote to look for the colors, but I forgot to do this). Well, I’ve seen the concentric ring. So there 3 distinct area’s: The outer halo, a triangular shaped inner disc, and a concentric ring, and of course the central star. Those 3 areas are best visible at 316x with filter. But without filter it remains slightly visible. During a few moments I thought I could see some structure in the halo (2 dark area’s, each of them ¼ of a circle).

NGC 2371/72 – planetary nebula in Gemini
A double lobed planetary nebula (peanut shaped). It’s quite impressive in the 18” at 211x with UHC filter. The SW lobe is the brightest one and contains a bright area. The NE lobe also contains at its eastern edge a brighter area. The centre (the area between the 2 lobes) is dark. Nice object.

I’ve been spending almost 4 hours in the cold, time to get inside. Quite glad of this evening session.

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