NGC 1491 in mapped color
NGC 1491 is a ionized HII  emission nebula  lit up by a hot O6 star near the center of the image.  This star is surrounded by a bubble of gas shown in blue (OIII) light.  The surrounding area is full of hydrogen gas.  To the left of  the star lighting up this region is a long pillar of gas and shock front pointing towards the star. 

Image Information
 Object Information
Telescope
 8"SCT OTA
 Designation
 NGC 1491, SH2-206
Focal Length
 f7.5
 Type
 Emission nebula
Guiding
 MX5-16 on 8"SCT
 Position
 RA 04:03:40  DEC +51:20:09
Telescope Control
 Maxim 4.51
 Magnitude
 Unlisted
CCD Camera
 Starlight Xpress SXV-H9
 Size
 25X25 arcmin
Image Scale
 .90 arcsec/px
 Distance
 10,760   light years
Filters
 Astronomik Ha, SII, OIII narrow band filter set
 Constellation
 Perseus
Exposures
 SII:Ha:OIII  132:420:120 Ha 20min subs, OIII,SII Bin 2x2
 Image field
 20X15 arcmin
Calibration
 Flats, Bias
 Notes
Processing Software
 Maxim 4.51, PixInsight LE, Photoshop CS2

Date
 21-26 Dec 05


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