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  #1  
Old 19-06-2013, 06:57 PM
Dennis
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Haute-Provence 1 Globular Cluster in Ophiuchus.

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, 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 produced ESO 455-11 -- Globular Cluster

I also found a 15’x15’ field from the DSS here.

SEDS provided the following details:
  • 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.

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
Attached Thumbnails
Click for full-size image (HP-1 LRGB 1024 text.jpg)
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Last edited by Dennis; 20-06-2013 at 06:32 AM. Reason: Corrected the entry for The Sky X Pro
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Old 19-06-2013, 07:09 PM
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RickS (Rick)
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Nicely done, Dennis! Some of these GCs you dig out are such subtle little things.
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Old 20-06-2013, 12:05 AM
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Shiraz (Ray)
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very nice image of an unusual target Dennis.

Last edited by Shiraz; 20-06-2013 at 12:37 AM.
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Old 20-06-2013, 02:27 AM
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Joshua Bunn (Joshua)
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Well captured Dennis. You can find this target in TSX Pro under "MW-GC HP 1 BH 229" good luck anyone wanting to track that one down

Josh
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  #5  
Old 20-06-2013, 06:29 AM
Dennis
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Thanks Rick, Ray and Joshua, I appreciate your comments.

Just to correct a previous statement about HP 1 and The Sky X Pro, it is indeed listed although to find it, you need to prefix the search string “HP1” with “SAC” as it is part of the SAC database, which is one of the core databases (Source Catalogue: Saguaro Astronomy Club Database) of The Sky X.

The search string is SAC {ID}.

So, to find Terzan 5, you search for “SAC Ter 5”.

Cheers

Dennis
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Old 20-06-2013, 07:41 AM
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multiweb (Marc)
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Very cool shot and a funny name. Where does that come from?
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  #7  
Old 20-06-2013, 08:19 AM
Dennis
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Originally Posted by multiweb View Post
Very cool shot and a funny name. Where does that come from?
Hi Marc

Jean Dufay, Pierre Berthier and Bernard Morignat discovered this GC in 1954 and I believe it was at the l'Observatoire de Haute-Provence, hence the Haute-Provence 1 designation.

I also understand that another French astronomer, Agop Terzan, discovered the Terzan GCs at the same observatory.

Vive la France !

Cheers

Dennis
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Old 20-06-2013, 08:37 AM
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Another great capture there Dennis, your collection of obscure globulars seem to be growing almost weekly
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  #9  
Old 20-06-2013, 08:48 AM
Dennis
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Originally Posted by SkyViking View Post
Another great capture there Dennis, your collection of obscure globulars seem to be growing almost weekly
Hi Rolf

Yeah mate – all thanks to you after posting your Terzan 5 image back in 2010, I haven’t slept since!

The GC list in SkyTools 3 Pro (attached) shows that I have a loooong way to go…there are so many!

Cheers

Dennis
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Old 20-06-2013, 09:55 AM
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multiweb (Marc)
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Quote:
Originally Posted by Dennis View Post
Hi Marc

Jean Dufay, Pierre Berthier and Bernard Morignat discovered this GC in 1954 and I believe it was at the l'Observatoire de Haute-Provence, hence the Haute-Provence 1 designation.

I also understand that another French astronomer, Agop Terzan, discovered the Terzan GCs at the same observatory.

Vive la France !

Cheers

Dennis
Ha... yeah should have read all the post. Thanks.
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  #11  
Old 20-06-2013, 07:09 PM
Dennis
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Quote:
Originally Posted by multiweb View Post
Ha... yeah should have read all the post. Thanks.
Hi Marc

I think that HP-2, HP-3, etc. were re-labelled as the Terzan GCs, so HP-3 became Terzan 2.

Cheers

Dennis
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  #12  
Old 20-06-2013, 07:12 PM
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Excellent result Dennis, love obscure globs when presented this well, nice work

Mike
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  #13  
Old 20-06-2013, 07:44 PM
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An obscure target Dennis. Well done.
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  #14  
Old 20-06-2013, 08:36 PM
Dennis
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Thanks Michael and Paul, I appreciate your comments.

I find this type of target well suited to the F12 Mewlon 180 and the 1600x1200 ST2000XM CCD just about covers the sweet spot where DK’s are sharp, with just a little distortion at the edge of the FOV.

Cheers

Dennis
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  #15  
Old 20-06-2013, 10:36 PM
Ross G
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Great capture Dennis.

A new object for me.

Ross.
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  #16  
Old 21-06-2013, 01:13 AM
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Great catch of an obscure milkyway glob, I wondered which new one you would try next. Keep them coming, pity about the weather here in Bris its really awful.

John.
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  #17  
Old 21-06-2013, 04:15 AM
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Nicely done Dennis. I love obscure globulars.

Cheers

Steve
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