Alpha Circini

[jsmoraes (Jorge)]

Distant from 54 light years, a variable um fast pulsation cycles of 6.8 minutes, in main sequence with a period of 4.5 days.

Magnitude:
Companion 1: 3.18
Companion 2: 8.47

separtion: 15.7 arcsec
angular position: 226 degres
data: 2000.00

I found a reference to third companion with magnitude 12 and separation of 64.6 arcsec

GSO 305 mm - Canon T3 - Skyglow filter - Coma corrector

10 seconds - ISO 3200
10 seconds - ISO 100

[cometcatcher (Kevin)]

That's brilliant Jorge! Your have a real talent for photographing doubles.

[astroron (Ron)]

Well Done Jorge,marvelous work.
Cheers

[jsmoraes (Jorge)]

Thank you Ron and Kevin. Doubles are very dependent of resolution and we must try many set of ISO and exposition time to get the best image of them.
The GSO 305 mm do it very well.

[glend (Glen)]

Jorge, how does the GSO 305 perform on the NEQ6 mount? I have that mount but did not think it would handle a scope that heavy for imaging?
Are you doing DSO imaging as well? Can it guide a scope that big accurately?

[jsmoraes (Jorge)]

Glen, many peoples say it is impossible. I say it is possible: I do it !

You need to remove everything that isn't necessary. Let the OTA nude. Balance very well (with the camera on the focuser). Do a good polar alignment. See the image attached.

I use the EQMOD plataform with PHD2 to better adjust the RA and DEC movement. It has more ressources than PHD 2. Mainly the intensity of RA and DEC movement: percent of sideral speed
My drift is around 0.5 arcsecond. My resolution with Canon T3, Coma corrector GSO is around 0.65 arcsecond per pixel... therefore imperceptible.

The main problem is DEC movement because of backlash. Therefore polar alignment is very important. You must reduce those movement.

I use 3 counterweight and extension bar to get good balance. OAG is very important to reduce the total weight: no auxiliary guiding telescope.

note: it is in portuguese, but the photos speek better than text
http://astronomia-e-astrofotos.10697...ur-td1723.html