|
Object |
M7- (NGC
6475) AKA Ptolemy's Cluster |
|
Info |
M7 is located near the tip of
The Scorpions tail in the constellation Scorpius. It is a open cluster of
around 100 (not all seen in this field) dominant blue stars in total that
are aged around 200 million years old. It is a spectacular open cluster as
it seems to float in the rich golden star cloud towards the centre of our
very own galaxy, The milky Way. M7
lies aprox. 1000 light years away. |
|
Date |
Lum 29/ 05
11 & RGB 31 / 05/ 11 |
|
Location |
BayTop
Observatory- Streaky Bay South Australia |
|
Instrument |
Home built 10" Newtonian (Bob
Royce primary) and an Antares 1/20th wave
secondary with Televue Paracorr
coma corrector. System working
@ f4.6 (native F4/
1016 FL) 1.315
arcsec/pixel- FOV 44.6x44.6 |
|
Mount |
Celestron CI700 controlled by the
SiTech servo Goto Control System
with Pittman 8000 series motors.
Pulley and belt system |
|
Camera (CCD) |
Starlight
Xpress SXVR-H16 monochrome with Starlight Xpress USB
filter wheel. |
|
Exposures |
L:
25' R:10' G:10' B:10' (50sec
sub exposures all unbinned) Flat field and
bias subtracted. |
|
Guiding |
ST80
refractor F5 with a Starlight Xpress HX516
CCD. Mounted via a side by side accessory
plate. plate. |
|
Filters |
Astronomik
typeII anti halo Ha
(12nM) RGB 2" filter set |
|
Notes/ Conditions |
Conditions- When taking the Lum data, there was a lot of
dew and a hint of faint cloud passing over head. Two nights later the
evening was quite windy with no dew, but seeing was average. |
