Double Star
WDS HU 662

Coordinates/Direction :	RA: 16h19m, DEC: +51^o34'
Object size :	Double star separation 4"
Object magnitude :	Primary 9.75, Secondary 13.80

Double Star WDS HU 662, 2019-02-16:

(Place the cursor over the image to get info)

Date :	2019-02-16
Time (UT) :	01:06 to 01:14

Mount :

SkyWatcher EQ6 Pro, Beltdrive (DIY 2019)

Guide :

QHY5 camera with 400 mm f/6.3 lens

Lens/telescope :	TS130 APO f/7 910mm, 3" focuser
Corrector/Barlow :	3" field flatter, 1.0x
Field (FOV) :	2.25 x 1.5^o (full frame) before crop

camera :	Canon 6D, QE=0.5, full frame, pixel size 6.54um, 20 Mpixel, 14 bit
camera temperature:	About 6^o C above surrounding temperature
Film/CCD :	Raw, Cr2
Filter :	none

Control system :

Mount by EQMOD, camera by APT, guide by PHD2, focuser by USB-focus, ASCOM Windows PC

Exp. time :	10x30 seconds, iso1600, dithering mode
Image process tool :	AstroImageJ, Fitswork, IrfanView
Processing :	demosaic, flat, hot pixel removed by dithering, level. This is a 400x400 pixel 1:1 crop zoomed x2
Weather :	clear

Site :

Sweden, Stockholm, Hagsätra. Bortle 9
Free view Az: 20^o to 90^o, 165^o to 185^o, Alt: 20^o to 55^o

Comment :

After I took the photo of STT 307 I want a double star with a more challenge, two stars that are closer to each other. I found the object HU 662 that has a separation of 4". Can my low resolution telescope that is specially built for wide field resolve these two stars?

As you see there isn't easy to see the two stars with this low resolution, just a little bulge on the lower right side. My system is under sampled, with Drizzle or Super resolution technique I can get better resolution from these photos.

More to know :

Double Star, Wikipedia:
https://en.wikipedia.org/ wiki/ Double star

Stelledoppie, HU 662:
https://www.stelledoppie.it/ index2.php? iddoppia=65746

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