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ASTRO: Gyulbudaghian's Nebula Revisited -- It does change



 
 
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  #1  
Old June 13th 14, 09:34 AM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
external usenet poster
 
Posts: 3,085
Default ASTRO: Gyulbudaghian's Nebula Revisited -- It does change

Gyulbudaghian's Nebula is a reflection nebula around PV Cephi which is
in quite a large dust cloud. Like other such nebulae in dust around
newly forming stars it is a variable nebula. Hubble's Variable nebula
is the most famous but there are others such as NGC 1554 the nebula lit
by T Tauri. Gyulbudaghian's Nebula is just another example. Checking
the POSS 2 plates there is a huge change between the time the red and
blue images were taken. I don't know the dates unfortunately.

I first imaged this one on September 24, 2011 under very good
conditions. After seeing some low resolution images taken in the fall
of 2013 that appeared to show a change I put it on the list. Seeing and
transparency never cooperated. About the time it was getting too far
west I had a go at it anyway on December 24, 2013. Due to poorer seeing
and transparency conditions make a comparison impossible other than to
say it has obviously changed greatly over the 27 months. I've included
a crop of both images at 0.8" per pixel. If you look closely you'll
notice the 2013 image is slightly larger scale as the 2011 image is
closer to 0.81" per pixel while this year's image is about 0.79 per
pixel. This is due to how my image scale changes with temperature. I
didn't compensate for the 20C temperature difference those two nights.
This year was very cold compared to 2011 and it results in a slightly
larger image scale. Rather than get all precise I just call it 0.8" or
1" or 0.67" which is the average but actual could be greater or lesser
depending on the night's temperature.

If you follow the long left arm in the 2013 image you come to an
elongated object or maybe it is two objects the longer above the
shorter. The shorter is the Herbig Haro object HH 415. I don't know if
the upper section is related or not. I found no separate designation
for it. It looks as if it may be an unrelated blue galaxy. Fainter HH
315 lies to the northwest. SIMBAD lists a few other HH regions but none
made it through my poor transparency. The dark nebula in the lower
right is LDN 1155C, part of the larger LDN 1155 outside of my image.
What few galaxies NED listed in the field have been identified even
though they are identified only by their J2000 coordinates in the 2MASS
survey.

The blue arc at the very bottom, left of center is due to a star just
barely off the chip, SAO 19041 at magnitude 9.7. It must have hit
something to reflect so strongly into the frame.

My full image from 2011 can be seen at:
http://www.spacebanter.com/attachmen...9&d=1347392450

14" LX200R @ f/10, L=8x10' RGB=2x10' (needed a lot more), STL-11000XM,
Paramount ME

Rick
--
Prefix is correct. Domain is arvig dot net

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Name:	PVCEPHI_L8X10RGB2X10ID.JPG
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ID:	5157  
  #2  
Old June 19th 14, 10:47 PM posted to alt.binaries.pictures.astro
Stefan Lilge
external usenet poster
 
Posts: 2,269
Default ASTRO: Gyulbudaghian's Nebula Revisited -- It does change

Mighty image with all those details.
This nebula looks even more interesting than Hubble's variable nebula.

Stefan



"Rick Johnson" schrieb im Newsbeitrag
...

Gyulbudaghian's Nebula is a reflection nebula around PV Cephi which is
in quite a large dust cloud. Like other such nebulae in dust around
newly forming stars it is a variable nebula. Hubble's Variable nebula
is the most famous but there are others such as NGC 1554 the nebula lit
by T Tauri. Gyulbudaghian's Nebula is just another example. Checking
the POSS 2 plates there is a huge change between the time the red and
blue images were taken. I don't know the dates unfortunately.

I first imaged this one on September 24, 2011 under very good
conditions. After seeing some low resolution images taken in the fall
of 2013 that appeared to show a change I put it on the list. Seeing and
transparency never cooperated. About the time it was getting too far
west I had a go at it anyway on December 24, 2013. Due to poorer seeing
and transparency conditions make a comparison impossible other than to
say it has obviously changed greatly over the 27 months. I've included
a crop of both images at 0.8" per pixel. If you look closely you'll
notice the 2013 image is slightly larger scale as the 2011 image is
closer to 0.81" per pixel while this year's image is about 0.79 per
pixel. This is due to how my image scale changes with temperature. I
didn't compensate for the 20C temperature difference those two nights.
This year was very cold compared to 2011 and it results in a slightly
larger image scale. Rather than get all precise I just call it 0.8" or
1" or 0.67" which is the average but actual could be greater or lesser
depending on the night's temperature.

If you follow the long left arm in the 2013 image you come to an
elongated object or maybe it is two objects the longer above the
shorter. The shorter is the Herbig Haro object HH 415. I don't know if
the upper section is related or not. I found no separate designation
for it. It looks as if it may be an unrelated blue galaxy. Fainter HH
315 lies to the northwest. SIMBAD lists a few other HH regions but none
made it through my poor transparency. The dark nebula in the lower
right is LDN 1155C, part of the larger LDN 1155 outside of my image.
What few galaxies NED listed in the field have been identified even
though they are identified only by their J2000 coordinates in the 2MASS
survey.

The blue arc at the very bottom, left of center is due to a star just
barely off the chip, SAO 19041 at magnitude 9.7. It must have hit
something to reflect so strongly into the frame.

My full image from 2011 can be seen at:
http://www.spacebanter.com/attachmen...9&d=1347392450

14" LX200R @ f/10, L=8x10' RGB=2x10' (needed a lot more), STL-11000XM,
Paramount ME

Rick
--
Prefix is correct. Domain is arvig dot net

 




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