Astronomical League
Globular Cluster Observing Program Images

Progress: 9/30/2016, 51 of 50
The required 3 Challenge objects have been completed

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This and linked image pages will be submitted to the Minnesota Astronomical Society Astronomical League Awards Coordinator in fulfillment of the AL Bright Nebula Observing Program (imaging option).

Click on the links below to view the images and their acquisition information. Explanatory notes can be found below the imaged object list giving details about hardware, etc. Use your browser's "back" button to return to this page.

Listed below are the objects that have been imaged.

List
#
Link to image
and data
Link to image
only
Est.
SSC**
Actual
SSC
Error
3, 4 M31 Globulars
G1 and G2
©
Image* NA NA NA
5-32 M31 Inner Globulars
©
Large
Small
NA NA NA
33 NGC 288 Image* IX X -1
35,36 M33 Globulars
©
Large
Small
NA NA NA
67 NGC 5272 / M3 Image VIII VI +2
70 NGC 5466
©
Image* XII XII 0
92 NGC 6205 / M13 Image VII V +2
93 NGC 6229 Image* III IV -2
94 NGC 6218 / M12 Image* IX IX 0
96 NGC 6254 / M10 Image* IX VII +2
106 NGC 6341 / M92 Image* VII IV +3
169 NGC 6749 Image* ?   NA
171 NGC 6760 Image* V IX -4
172 NGC 6779 / M56 Image* II X -8
177 NGC 6809 / M 55 Image* IX XI -2
180 NGC 6838 / M71 Image* VIII X-XI -2
182 NGC 6934 Image* III VIII -5
183 NGC 6981 / M 72 Image* V IX -4
184 NGC 7006 Image* VIII I +7
185 NGC 7078 / M15 Image II IV -2
186 NGC 7089 / M2 Image* IV II +2
187 NGC 7099 / M 30 Image* V V 0
189 Palomar 13
©
Image* XII ? NA

* denotes that the image has been cropped to a standard size for comparison with other images. These have all been taken with a TV-102 @ f/7 and Canon T2i, and are full-scale, 800x800-pixel crops of the full-frame images. Exposures and processing vary.

** SSC is the Shapley-Sawyer Concentration class. The actual values are taken from standard sources.

© denotes challenge object

All objects were located by star-hopping.

All images on this web site are copyright © David Venne. Their commercial use is prohibited without written consent.

 

Explanatory Notes for Object Entries

Locations | Telescopes | Cameras | Filters


Locations
Location
Type
LM*
Lat
Lon
Alt(m)
Burnsville
outer urban
4.5
44°47'30"N
93°13'53"W
293
Cherry Grove Observatory
rural
6.8
44°11'49"N
92°51'44"W
357
Long Lake Conservation Center remote rural 7.3
46°38'49"N
93°27'54"W
389
StarHome Observatory
exurban
5.6
45°23'8"N
93°0'13"W
278

*Moonless limiting magnitude derived from Light Pollution Atlas 2006



Imaging Telescopes

Telescope
FL (mm)
f ratio
Televue
TV-102
w TV 0.8X FF/FR
700
6.9
Astro-Tech
AT72ED
w Orion 1.0X FF/FR
432 6.0
Astro-Tech
AT65EDQ
422
6.5
Celestron
C925
@ f/10
2350
10
Celestron
C925 @ f/6.3
w Celestron 0.63X FF/FR
1480
6.3
Intes
MK 67
1824 12


Imaging Cameras

SBIG ST-8300M: SBIG ST-8300M monochrome CCD, unbinned resolution 3326 x 2504 px,
sensor size 18 x 13.5mm

Canon XTi: Canon XTi DSLR, umodified, resolution 3888 x 2592 px,
sensor size 34 x 22.7mm

Canon T2i (H-alpha modded by Gary Honis), resolution 5184 x 3456 px,
sensor size 34 x 22.7mm



Imaging Filters

Baader 36mm radius used for LRGB images taken with SBIG ST-8300M



Processing Software

Acquisition: ImagesPlus Camera Control, PHD autoguiding

Calibration, Alignment and Stacking: ImagesPlus

Further Processing: ImagesPlus, Photoshop, Annie's Astro Actions, Astronomy Tools.