IC 4633 and the surrounding IFN


IC 4633 is a conspicuously spiral galaxy located in the small Southern constellation Apus. This Image shows, nevertheless, some deep sky objects that are worth mentioning. The four galaxies in the image (from upper left to lower right: IC 4633, IC 4635 with its smaller companion 2MASSX J17151422-7727251 and ESO 44-10) are seen behind a foreground Integrated Flux Nebula (IFN), named GN, that belongs to our galaxy. All stars seen in this frame belong to our galaxy too. By coincidence, the brightest stars in this small constellation are all red. The star on the lower right is HD 155557, a 8.95 magnitude K3III c star.



Additional Information


Name(s): IC 4633

Type: Spiral Galaxy

RA:  17h 13m 46s

Dec: -77º 32’ 11”

Constellation: Apus

Size (arcmin): 4×3 arcmin

Magnitude: +13

Distance: 110 Mly


Date: 2019-07-31 to 2020-09-07 (two seasons)

Location: iTelescope.net, SSO near Coonabarabran, NSW Australia

Size (arcmin): 34×34 arcmin

Telescope: 20” f/6.8 Reflector

Camera: SBIG STX16803 (4096x4096pix)

Guiding: Astrodon MonsterMOAG off-axis guider

Total exposure: 16.5 hours (L: 8.5 hours; RGB: 8 hours)

Processing: CCDStack, Photoshop CC 2020

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