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ASTRO: vdB 111
VdB 111 is a reflection nebula in Ophiuchus around the star HD 156697.
According to The Sky 6 the star is a rather white F0III-IV star. As the variable classification indicates it is a variable star that pulsates in size more than in brightness. The range is listed at 6.50 to 6.52 which would be hard to see visually. Since the nebula is very blue it would lie a bit in front of the star to have a color much bluer than the star itself. This is the same effect as the sky being blue from sunlight shining through it. Our star is even redder than this one yet creates a blue sky when it shines through it. When the nebula is behind the star so just illuminated by the star it takes on more closely the color of the star itself. The Sky 6 says the star is at a distance of 28,767,800 AU which would put it about 455 light years from us. This would be virtually the same as the nebula's distance. What few images of it I found on the net usually contain the comment that it is small and uninteresting. Guess I don't see it that way but then nearly everything out there I find interesting. While there are some background galaxies NED had no redshift data on any, all being galaxies from the 2 Micron All Sky Survey (2MASS) which rarely had redshift data. There's one asteroid down in the lower right corner of the image. It is 18th magnitude (215122) 1999 LG4. As usual, conditions were poor so even this rather bright asteroid is very difficult to see. Normally an 18th magnitude asteroid would be very obvious. Fortunately vdB 111 is a rather bright reflection nebula. Though I likely lost its fainter outer parts to sky conditions. 14" LX200R @ f/10, L=4x10' RGB=2x10', STL-11000XM, Paramount ME Rick -- Prefix is correct. Domain is arvig dot net |
#2
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ASTRO: vdB 111
Rick,
I just have put this nebula on my list... Stefan "Rick Johnson" schrieb im Newsbeitrag ... VdB 111 is a reflection nebula in Ophiuchus around the star HD 156697. According to The Sky 6 the star is a rather white F0III-IV star. As the variable classification indicates it is a variable star that pulsates in size more than in brightness. The range is listed at 6.50 to 6.52 which would be hard to see visually. Since the nebula is very blue it would lie a bit in front of the star to have a color much bluer than the star itself. This is the same effect as the sky being blue from sunlight shining through it. Our star is even redder than this one yet creates a blue sky when it shines through it. When the nebula is behind the star so just illuminated by the star it takes on more closely the color of the star itself. The Sky 6 says the star is at a distance of 28,767,800 AU which would put it about 455 light years from us. This would be virtually the same as the nebula's distance. What few images of it I found on the net usually contain the comment that it is small and uninteresting. Guess I don't see it that way but then nearly everything out there I find interesting. While there are some background galaxies NED had no redshift data on any, all being galaxies from the 2 Micron All Sky Survey (2MASS) which rarely had redshift data. There's one asteroid down in the lower right corner of the image. It is 18th magnitude (215122) 1999 LG4. As usual, conditions were poor so even this rather bright asteroid is very difficult to see. Normally an 18th magnitude asteroid would be very obvious. Fortunately vdB 111 is a rather bright reflection nebula. Though I likely lost its fainter outer parts to sky conditions. 14" LX200R @ f/10, L=4x10' RGB=2x10', STL-11000XM, Paramount ME Rick -- Prefix is correct. Domain is arvig dot net |
#3
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ASTRO: vdB 111
It might be a bit tough from town. van den Berg lists it as bright but
keep in mind the reflection nebulae around the 4 star, vdB 20-23 are listed as very bright so this one is fainter than those but as vdB objects go one of the brightest. Most are much fainter. Even for my dark skies they aren't easy targets. I'll be interested to see what you get. This is a July image so be a bit before it is well placed to put a lot of time into it. Rick On 4/24/2013 4:10 PM, Stefan Lilge wrote: Rick, I just have put this nebula on my list... Stefan "Rick Johnson" schrieb im Newsbeitrag ... VdB 111 is a reflection nebula in Ophiuchus around the star HD 156697. According to The Sky 6 the star is a rather white F0III-IV star. As the variable classification indicates it is a variable star that pulsates in size more than in brightness. The range is listed at 6.50 to 6.52 which would be hard to see visually. Since the nebula is very blue it would lie a bit in front of the star to have a color much bluer than the star itself. This is the same effect as the sky being blue from sunlight shining through it. Our star is even redder than this one yet creates a blue sky when it shines through it. When the nebula is behind the star so just illuminated by the star it takes on more closely the color of the star itself. The Sky 6 says the star is at a distance of 28,767,800 AU which would put it about 455 light years from us. This would be virtually the same as the nebula's distance. What few images of it I found on the net usually contain the comment that it is small and uninteresting. Guess I don't see it that way but then nearly everything out there I find interesting. While there are some background galaxies NED had no redshift data on any, all being galaxies from the 2 Micron All Sky Survey (2MASS) which rarely had redshift data. There's one asteroid down in the lower right corner of the image. It is 18th magnitude (215122) 1999 LG4. As usual, conditions were poor so even this rather bright asteroid is very difficult to see. Normally an 18th magnitude asteroid would be very obvious. Fortunately vdB 111 is a rather bright reflection nebula. Though I likely lost its fainter outer parts to sky conditions. 14" LX200R @ f/10, L=4x10' RGB=2x10', STL-11000XM, Paramount ME Rick -- Prefix is correct. Domain is arvig dot net |
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