Melotte 15, SHO (HST) and RGB stars (Rick Veregin)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: IC 1805 · Sh2-190

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Melotte 15, SHO (HST) and RGB stars

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Melotte 15, SHO (HST) and RGB stars

This new version of Melotte 15 in SHO (HST palette) includes RGB stars. Since the nebulosity is driven by an OB association of very young hot blue supergiant stars, the stars are important.

Imaging Telescope The Royal Astronomical Society of Canada Robotic Telescope

Object Melotte15 (open cluster within IC1805 (Heart Nebula))

Date 2019 August-September

Narrowband (Ha, OIII, SII): 14 x 1800s each, total 21 hours

RGB 5x180s each, total=45 minutes

Location Sierra Remote Observatories, Auberry, California

Telescope RCOS 16" f/8.9 (3550mm focal length)

CCD Camera SBIG STX16803 16MP (4096 x 4096)

Mount Paramount ME

Filters SBIG Ha (7nm), OIII (8.5nm), SII (8nm), SBIG RGB

I registered and stacked the raw data in DSS, with flats, biases and darks.

I found SHO (60+40, 30+30+40,100) gave me a good balance for each channel. In Photoshop, I further tweaked color for that gold/blue HST coloring, with some green.

The starless image was made using Starnet++. I used Topaz AI DeNoise to reduce noise, which really helps bring out detail as well.

RGB stars were added on top of the SHO image.

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The Royal Astronomical Society of Canada Robotic Telescope

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Status	Advanced success
Started	...
Astrometry.net job	4170636
PixInsight job	8ZBH2HCV3UFSIQYYB8TJ9F5WQX5RQS3H
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	02h33m35s.694
RA (top/left)	02h31m03s.295
RA (top/right)	02h35m10s.813
RA (bottom/right)	02h36m09s.742
RA (bottom/left)	02h31m58s.607

Dec (center)	+61°24′47″.88
Dec (top/left)	+61°13′13″.59
Dec (top/right)	+61°06′26″.92
Dec (bottom/right)	+61°36′11″.89
Dec (bottom/left)	+61°43′05″.50

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Melotte 15, SHO (HST) and RGB stars

Melotte 15, SHO (HST) and RGB stars

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Melotte 15, SHO (HST) and RGB stars

Melotte 15, SHO (HST) and RGB stars

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