Dennis
22-06-2010, 09:40 AM
Introduction:
Inspired by Rolf’s images of faint globulars Terzan 5 & UKS-1, along with Justin’s herculean effort of HH-32, I thought that I’d attempt to take an image of Terzan 10 as a test of equipment and technique, as Gerald had kindly loaned me his SBIG ST2000 with CFW10 for a couple of nights.
Where the bl**dy hell are you???
I used The Sky 6 Pro to acquire the field and centred the view on where it plotted Terzan 10. Bad move! If I had been using my 765x510 pixel ST7, I would have completely missed the target as it wasn’t to be found at that location – something I didn’t discover until the next day.
However, the 1600x1200 pixel vista of the ST2000 managed to record Terzan 10 towards the top of the larger frame. I later used Sky Tools 3 Pro which plotted the position of Terzan 10 accurately and when prompted, downloaded a DSS image, verifying its established position.
I really should have read the Astronomy-Mall (http://astronomy-mall.com/Adventures.In.Deep.Space/obscure.htm)article for Terzan 10 which writes:
"One of the biggest problems in finding this globular is the incorrect positional data in several sources including Sky Catalog 2000"
Attached files:
1. Main image:
Full frame, Down sampled to 1280x960 (showing crop region)
Field centred on RA 18h 03m 27s, -26º 03’ 50”
Image scale 0.82 arcsec/pixel
FOV approx 22” x 16” (1600x1200)
2. Croped image:
800x600 crop from main image.
3. DSS Image:
STScI(US) Second Generation DSS Red, 10”x10” FOV downloaded via SkyTools
Imaging Details:
Brisbane, Qld, Australia
20th June 2010.
Tak Mewlon 180 F12 with x0.8 Reducer at an efl of 1728mm.
ST2000 and CFW10
Luminance: 2 x 15 minutes.
RGB 1 x 10 minute each.
Terzan 10 is listed as:
Apparent magnitude: 14.9
Brightest star: 19.7
Size: 0.3 arc minutes
Excuse the LRGB processing, I have much to learn and for this image, I just head-butted the data to beat it into submission – I know not yet how to do this stuff properly!:)
Terzan globulars:
Some background details on the Terzan globulars can be found here.
http://natkobajic.netfirms.com/listTERZAN.html
I also found and ESO paper which identifies Terzan 10 as ESO456-SC38.
http://aas.aanda.org/index.php?option=com_article&access=standard&Itemid=129&url=/articles/aas/abs/1997/17/ds6163/ds6163.html
A pdf article can be downloaded from the right hand Table of Contents under Abstract which shows images of Terzan 10 and UKS-1 taken with the European Southern Observatory 3.55 m New Technology Telescope (NTT) equipped with the SUSI camera and a 1024x1024 thinned Tektronix ESO CCD at the Nasmyth focus B.
Finally, this image would not have been possible without the generous sponsorship of Gerald and his ST2000! Thanks Gerald!:)
Cheers
Dennis
Inspired by Rolf’s images of faint globulars Terzan 5 & UKS-1, along with Justin’s herculean effort of HH-32, I thought that I’d attempt to take an image of Terzan 10 as a test of equipment and technique, as Gerald had kindly loaned me his SBIG ST2000 with CFW10 for a couple of nights.
Where the bl**dy hell are you???
I used The Sky 6 Pro to acquire the field and centred the view on where it plotted Terzan 10. Bad move! If I had been using my 765x510 pixel ST7, I would have completely missed the target as it wasn’t to be found at that location – something I didn’t discover until the next day.
However, the 1600x1200 pixel vista of the ST2000 managed to record Terzan 10 towards the top of the larger frame. I later used Sky Tools 3 Pro which plotted the position of Terzan 10 accurately and when prompted, downloaded a DSS image, verifying its established position.
I really should have read the Astronomy-Mall (http://astronomy-mall.com/Adventures.In.Deep.Space/obscure.htm)article for Terzan 10 which writes:
"One of the biggest problems in finding this globular is the incorrect positional data in several sources including Sky Catalog 2000"
Attached files:
1. Main image:
Full frame, Down sampled to 1280x960 (showing crop region)
Field centred on RA 18h 03m 27s, -26º 03’ 50”
Image scale 0.82 arcsec/pixel
FOV approx 22” x 16” (1600x1200)
2. Croped image:
800x600 crop from main image.
3. DSS Image:
STScI(US) Second Generation DSS Red, 10”x10” FOV downloaded via SkyTools
Imaging Details:
Brisbane, Qld, Australia
20th June 2010.
Tak Mewlon 180 F12 with x0.8 Reducer at an efl of 1728mm.
ST2000 and CFW10
Luminance: 2 x 15 minutes.
RGB 1 x 10 minute each.
Terzan 10 is listed as:
Apparent magnitude: 14.9
Brightest star: 19.7
Size: 0.3 arc minutes
Excuse the LRGB processing, I have much to learn and for this image, I just head-butted the data to beat it into submission – I know not yet how to do this stuff properly!:)
Terzan globulars:
Some background details on the Terzan globulars can be found here.
http://natkobajic.netfirms.com/listTERZAN.html
I also found and ESO paper which identifies Terzan 10 as ESO456-SC38.
http://aas.aanda.org/index.php?option=com_article&access=standard&Itemid=129&url=/articles/aas/abs/1997/17/ds6163/ds6163.html
A pdf article can be downloaded from the right hand Table of Contents under Abstract which shows images of Terzan 10 and UKS-1 taken with the European Southern Observatory 3.55 m New Technology Telescope (NTT) equipped with the SUSI camera and a 1024x1024 thinned Tektronix ESO CCD at the Nasmyth focus B.
Finally, this image would not have been possible without the generous sponsorship of Gerald and his ST2000! Thanks Gerald!:)
Cheers
Dennis