Celestial hemisphere:  Southern  ·  Constellation: Ophiuchus (Oph)  ·  Contains:  HD147701  ·  HD147889  ·  IC 4603  ·  LBN 1109  ·  LDN 1681  ·  LDN 1686  ·  LDN 1688  ·  LDN 1690  ·  LDN 1692
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Reflection-Emission Nebula IC 4603, 


            Paul Lloyd
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Reflection-Emission Nebula IC 4603

Acquisition details

RA center: 16h25m23s.27

DEC center: -24°2754.10

Pixel scale: 4.257 arcsec/pixel

Orientation: -1.419 degrees

Field radius: 0.863 degrees

WCS transformation: thin plate spline

More info:Open 

Resolution: 842x1191

File size: 374.4 KB

Locations: Laurieton, NSW Australia, West Haven, NSW, Australia

Data source: Backyard


The rho Ophiuchi Complex is a huge gas and dust region spanning the borders of Scopius and
Ophiuchus. Numerous regions within this complex have been identified and are highly active in
star formation. This nebula lies near its centre and is ~420ly away. The blue regions of the nebula
are being illuminated by the very hot, class B3 star at the centre of the field. In addition, the nearby,
much brighter red giant star, Antares (α Sco), is illuminating these gas and dust clouds with its reddish
light. The light is also scuplturing the cloud into fantastic shapes. To add to the mix, many dark nebulae
(gas/dust clouds that are not being illuminated) are present.

Telescope: Askar PHQ107 refractor, f=750mm
Camera:     ZWO ASI294MC Pro, 36 x 300 sec, no filter
                    Bortle 3-4 sky, moonless
Field of View: approx. 1º 24’ x 1º 00’
Image processed and prepared in PixInsight and Photoshop Elements.


Sky plot

Sky plot


Reflection-Emission Nebula IC 4603, 


            Paul Lloyd