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Double Star
STT 307

Double Star WDS STT 307 (Place the cursor over the image to get info)
Coordinates/Direction : RA: 16h10m, DEC: +47o48'
Object size : Double star separation 17.5"
Object magnitude : Primary 7.67, Secondary 10.71
Object : WDS STT 307
Date : 2019-02-16
Time (UT) : 00:45 to 00:56
Mount : SkyWatcher EQ6 Pro, beltdrive modified (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, x1. T48 connector to camera
Field (FOV) : 2.25 x 1.5o (full frame) before crop
camera : Canon 6D, QE=0.5, full frame, 20 Mpixel, 14 bit
camera temperature: About 6o 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 : 7x30 seconds ISO1600, 5x30 seconds ISO800, 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: 20o-90o, 165o-185o, La: 20o-55o
Comment : A new night with clear sky, need some inspiration. Maybe I shall try to take photos of double stars? I downloaded a double star catalog in my star chart software CdC and chose the object STT 307. These two stars has an angle separation of 17.5". My telescope system has pixel scale is 1.49"/ pixel. But my camera is a color camera and then the separation is doubled to 3"/pixel seen from each color.

As you see there is easy to see the two stars even with this low pixel scale.

Just because the stars look to be close to each other it doesn't mean that they have to be that in 3D-space. Binary stars are different, that's two stars revolving each other. WDS stands for Washington Double Star catalog.
More to know : Double Star, Wikipedia: wiki/ Double star

Stelledoppie, STT 307: index2.php? iddoppia=65236
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