Dennis
19-06-2013, 06:57 PM
Hello,
Here is an image of the globular cluster Haute-Provence 1 in Ophiuchus taken from our back garden in Brisbane, with a 1st Quarter Moon hovering uncomfortably nearby. My most used observation planning program, SkyTools 3 Professional (http://skyhound.com/skytools.html), was used to point the ‘scope at the object and provides the following basic details for this GC:
Haute-Provence 1, Globular Cluster in Ophiuchus
R.A.: 17h31m05.0s Dec.: -29°58'54" (2000)
Magnitude: 12.50
Size: 1.2'
In The Sky X Pro it is found as "SAC HP1" and both Starry Night 6 Pro and SkySafari Pro (iPad) list the GC as well.
A SIMBAD query result (http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Haute-Provence+1&jsessionid=B6B0B64F1D05E8F8B64B5EBD 300F75B1)produced ESO 455-11 -- Globular Cluster
I also found a 15’x15’ field from the DSS here (http://spider.seds.org/spider/MWGC/Dss/dshp1.html).
SEDS provided the following details (http://spider.seds.org/spider/MWGC/hp1.html):
RA: 17:31:05.2 Dec: -29:58:54.
Distance from Sun: 26.7 kly
Distance from Galactic Center: 1.6 kly
Apparent Diameter: 8.2 arc min
Brightness: 11.59 mag vis
Discovered by Dufay, Berthier and Morignat in 1954. Independently rediscovered by van den Bergh and Hagen in 1975. Globular Cluster HP 1 was discovered by Dufay et.al. (1954), and sometimes referred to as "HP" for the Haute-Provence Observatory where the discovery occurred (e.g., Sawyer Hogg 1959). This designation was mutated to HP 1 as more globular clusters were discovered at that observatory in the 1960s by Terzan.
Until recently, it was thought that HP 1 is situated close to the Galactic Center, but recent estimates have put it as far as about 20,000 light years beyond, to a total distance of 46,000 light years from us.
Further information can also be found here (http://gclusters.altervista.org/cluster_4.php?ggc=HP+1).
Imaging details:
Due to intermittent clouds, the LRGB images were taken over 2 nights, the 16th and 18th June 2013 using a Tak Mewlon 180 F12 (at 2160mm prime focus) and an SBIG ST2000XM ccd camera with CFW9 filter wheel and Baader LRGB filters.
I managed to gather 10x5 mins of Luminance data and 4x5 mins each of RGB frames. The frames were calibrated, aligned and stacked in CCDStack before finishing in Photoshop CS6.
With full regard and respect for that tough and dedicated bunch of visual observers that chase down these dim, esoteric targets using their eyeballs, ;):) from an imaging perspective this was a relatively straightforward capture, as the location provided in SkyTools and other on-line searches proved very accurate.
Cheers
Dennis
Here is an image of the globular cluster Haute-Provence 1 in Ophiuchus taken from our back garden in Brisbane, with a 1st Quarter Moon hovering uncomfortably nearby. My most used observation planning program, SkyTools 3 Professional (http://skyhound.com/skytools.html), was used to point the ‘scope at the object and provides the following basic details for this GC:
Haute-Provence 1, Globular Cluster in Ophiuchus
R.A.: 17h31m05.0s Dec.: -29°58'54" (2000)
Magnitude: 12.50
Size: 1.2'
In The Sky X Pro it is found as "SAC HP1" and both Starry Night 6 Pro and SkySafari Pro (iPad) list the GC as well.
A SIMBAD query result (http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Haute-Provence+1&jsessionid=B6B0B64F1D05E8F8B64B5EBD 300F75B1)produced ESO 455-11 -- Globular Cluster
I also found a 15’x15’ field from the DSS here (http://spider.seds.org/spider/MWGC/Dss/dshp1.html).
SEDS provided the following details (http://spider.seds.org/spider/MWGC/hp1.html):
RA: 17:31:05.2 Dec: -29:58:54.
Distance from Sun: 26.7 kly
Distance from Galactic Center: 1.6 kly
Apparent Diameter: 8.2 arc min
Brightness: 11.59 mag vis
Discovered by Dufay, Berthier and Morignat in 1954. Independently rediscovered by van den Bergh and Hagen in 1975. Globular Cluster HP 1 was discovered by Dufay et.al. (1954), and sometimes referred to as "HP" for the Haute-Provence Observatory where the discovery occurred (e.g., Sawyer Hogg 1959). This designation was mutated to HP 1 as more globular clusters were discovered at that observatory in the 1960s by Terzan.
Until recently, it was thought that HP 1 is situated close to the Galactic Center, but recent estimates have put it as far as about 20,000 light years beyond, to a total distance of 46,000 light years from us.
Further information can also be found here (http://gclusters.altervista.org/cluster_4.php?ggc=HP+1).
Imaging details:
Due to intermittent clouds, the LRGB images were taken over 2 nights, the 16th and 18th June 2013 using a Tak Mewlon 180 F12 (at 2160mm prime focus) and an SBIG ST2000XM ccd camera with CFW9 filter wheel and Baader LRGB filters.
I managed to gather 10x5 mins of Luminance data and 4x5 mins each of RGB frames. The frames were calibrated, aligned and stacked in CCDStack before finishing in Photoshop CS6.
With full regard and respect for that tough and dedicated bunch of visual observers that chase down these dim, esoteric targets using their eyeballs, ;):) from an imaging perspective this was a relatively straightforward capture, as the location provided in SkyTools and other on-line searches proved very accurate.
Cheers
Dennis