Celestial hemisphere:  Northern  ·  Constellation: Monoceros (Mon)  ·  Contains:  NGC 2237  ·  NGC 2238  ·  NGC 2239  ·  NGC 2246  ·  NGC 2252  ·  Rosette A  ·  Rosette B  ·  Rosette Nebula  ·  The star 12Mon
Majestic Star Factory in Monoceros, 


            Terry Hancock
Majestic Star Factory in Monoceros
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Majestic Star Factory in Monoceros

Majestic Star Factory in Monoceros, 


            Terry Hancock
Majestic Star Factory in Monoceros
Powered byPixInsight

Majestic Star Factory in Monoceros

Acquisition details

Basic astrometry details

Astrometry.net job: 4381201

RA center: 06h32m30s.7

DEC center: +04°5519

Pixel scale: 0.862 arcsec/pixel

Orientation: 1.222 degrees

Field radius: 1.794 degrees

Resolution: 12067x8872

File size: 4.7 MB

Data source: Own remote observatory

Remote source: Grand Mesa Observatory


The Rosette Nebula captured recently in Narrowband using a QHY600 60 Megapixel Full Frame Monochrome CMOS camera mounted on the Takahashi 130 FSQ that we have the honor of testing for QHYCCD.

This setup is available immediately for people wanting to subscribe to Grand Mesa Observatory's system 1.


In this Hubble Palette version (SHO) the H-Alpha is mapped to green channel, SII is mapped to red channel and OIII is mapped to the blue channel.

Captured bin 2x2 over 3 nights in March 2021 for a total acquisition time of only 4.75 hours.

Technical Details

Captured and processed by: Terry Hancock

Location: GrandMesaObservatory.com Purdy Mesa, Colorado

Dates of Capture March 1st, 6th and 8th 2021

HA 90 min 18 x 300 sec

OIII 90 min 18 x 300 sec

SII 105 min 21 x 300 sec

Narrowband Filters by Chroma

Camera: QHY600 Monochrome CMOS Photographic version

Gain 60, Offset 76 in Read Mode Photographic 16 bit, bin 2x2

Calibrated with Dark, Bias and Flat Frames

Optics: Walter Holloway's Takahashi FSQ 130 APO Refractor @ F5

Mount: Paramount ME

Image Scale:2.39 arcsec/pix

Image Scale: 2x2 = 2.38 arcsec/pix

Field of View: 3d 7' 41.0" x 2d 3' 5.3 (127.3 x 190.1 arcmin)

Image Acquisition software Maxim DL6, Pre Processing and Starnet in Pixinsight Post Processed in Photoshop CC

The dim constellation Monoceros, just east of Orion, hosts yet another majestic star factory. The Rosette Nebula, a vast wreath of gas and dust with a cluster of new stars near its center, is not associated with the Orion Molecular cloud but lies further along the Orion Arm of the Milky Way.

The Rosette has an apparent size similar to the Orion Nebula. But at a distance of 5,000 light years, it’s three times farther than the Orion Nebula, which means it’s intrinsically three times larger, spanning a diameter of about 115 light years.

This extract from The Armchair Astronomer by Brian Ventrudo and Terry Hancock

The book is available in multi-media format from Apple’s iBook’s store, in high-resolution PDF format, and in standard e-book format from Amazon’s Kindle store.



Sky plot

Sky plot


Majestic Star Factory in Monoceros, 


            Terry Hancock