ASTRO: Sh2-247

Sh2-247 in Gemini was imaged back in January. It was so faint the my
usual 2x10' color data was unusable. Even the luminosity frames were
worthless but the 3 30 minute H alpha frames held usable but faint data.
I need to try for color data using longer sub frames but that will
have to wait for a few months. For now this will have to do.

Sky Map's section on Sharpless objects has this to say about it.

According to a 1989 study, Sh 2-247 is part of the Gem OB1 association,
contains 37 thousand solar masses of gas and dust at a distance of 2200
pc, and appears to be physically connected through CO filaments with Sh
2-252. It is ionised by the B0 III giant LS V +21 27.

Avedisova agrees on the ionising star but gives a larger distance
estimate of 3500 +/- 800 parsecs. She places Sh 2-247 in the complex
star formation region SFR 188.93+0.79 with 51 components, including 9
masers, several infrared star clusters, at least 4 molecular clouds, and
the young stellar object IRAS 06058+2138.

Now you know as much as I do about it. For the parsec challenged one pc
equals 3.26 light years so the first estimate puts it at about 7200
light years while the second is saying 11,400 +/- 2600 light years.
Since no error bar is given for the first estimate I can't tell if they
overlap or not.

14" LX200R @ f/10, Ha=3x30', STL-11000XM, Paramount ME

Rick

Rick,

interesting object. I somehow thought I had imaged it but didn't find an
image. I'll have to try this later this year.

Stefan

"Rick Johnson" schrieb im Newsbeitrag
. com...
Sh2-247 in Gemini was imaged back in January. It was so faint the my
usual 2x10' color data was unusable. Even the luminosity frames were
worthless but the 3 30 minute H alpha frames held usable but faint data.
I need to try for color data using longer sub frames but that will
have to wait for a few months. For now this will have to do.

Sky Map's section on Sharpless objects has this to say about it.

According to a 1989 study, Sh 2-247 is part of the Gem OB1 association,
contains 37 thousand solar masses of gas and dust at a distance of 2200
pc, and appears to be physically connected through CO filaments with Sh
2-252. It is ionised by the B0 III giant LS V +21 27.

Avedisova agrees on the ionising star but gives a larger distance
estimate of 3500 +/- 800 parsecs. She places Sh 2-247 in the complex
star formation region SFR 188.93+0.79 with 51 components, including 9
masers, several infrared star clusters, at least 4 molecular clouds, and
the young stellar object IRAS 06058+2138.

Now you know as much as I do about it. For the parsec challenged one pc
equals 3.26 light years so the first estimate puts it at about 7200
light years while the second is saying 11,400 +/- 2600 light years.
Since no error bar is given for the first estimate I can't tell if they
overlap or not.

14" LX200R @ f/10, Ha=3x30', STL-11000XM, Paramount ME

Rick

You may have. This one is faint for my location. While H alpha is a
great equalizer it may require an all nighter from your location. I
didn't expect it to be as faint as it turned out. Maybe I was looking
through high clouds and didn't know it. Something to revisit as I'd
like to try and get some color on it. Suppose I could RGB the stars
then pseudo color the nebula mixing H alpha into the red and blue. I'm
not much for that approach however. I need a bit more "reality".

Rick


Stefan Lilge wrote:
Rick,

interesting object. I somehow thought I had imaged it but didn't find an
image. I'll have to try this later this year.

Stefan

"Rick Johnson" schrieb im Newsbeitrag
. com...
Sh2-247 in Gemini was imaged back in January. It was so faint the my
usual 2x10' color data was unusable. Even the luminosity frames were
worthless but the 3 30 minute H alpha frames held usable but faint data.
I need to try for color data using longer sub frames but that will
have to wait for a few months. For now this will have to do.

Sky Map's section on Sharpless objects has this to say about it.

According to a 1989 study, Sh 2-247 is part of the Gem OB1 association,
contains 37 thousand solar masses of gas and dust at a distance of 2200
pc, and appears to be physically connected through CO filaments with Sh
2-252. It is ionised by the B0 III giant LS V +21 27.

Avedisova agrees on the ionising star but gives a larger distance
estimate of 3500 +/- 800 parsecs. She places Sh 2-247 in the complex
star formation region SFR 188.93+0.79 with 51 components, including 9
masers, several infrared star clusters, at least 4 molecular clouds, and
the young stellar object IRAS 06058+2138.

Now you know as much as I do about it. For the parsec challenged one pc
equals 3.26 light years so the first estimate puts it at about 7200
light years while the second is saying 11,400 +/- 2600 light years.
Since no error bar is given for the first estimate I can't tell if they
overlap or not.

14" LX200R @ f/10, Ha=3x30', STL-11000XM, Paramount ME

Rick