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Contains:  eta Car nebula, NGC 3372, NGC 3324, NGC 3293, Part of the constellation Carina (Car)
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The Great Carina Nebula

Technical card

Imaging telescope or lens:Takahashi TOA 150

Imaging camera:Pentax 645z Mod

Mount:Takahashi EM-400 Temma2

Guiding telescope or lens:SharpStar 50 ED

Guiding camera:ZWO ASI290MM Mini

Focal reducer:Takahashi TOA 67 Flattener

Software:PixInsightAuriga Imaging RegiStarPhotoshop CC

Resolution: 5640x7600

Dates:Feb. 1, 2019Feb. 3, 2019Feb. 4, 2019Feb. 5, 2019

Frames: 74x300" ISO1600

Integration: 6.2 hours

Avg. Moon age: 21.14 days

Avg. Moon phase: 3.04%

Bortle Dark-Sky Scale: 1.00

Astrometry.net job: 2581997

RA center: 160.753 degrees

DEC center: -59.697 degrees

Pixel scale: 2.036 arcsec/pixel

Orientation: 0.359 degrees

Field radius: 2.677 degrees

Locations: Avon Valley, York, Western Australia, Australia

Data source: Traveller

Description

Four-frame mosaic. Exposure time distribution is somewhat concentrated toward the center, to enhance S/N. My other two recent pictures of this target taken with shorter focal lengths are meant to provide references for registration and gradient removal for this image. This image is the actual goal.

Ver.A is the original version, which is a bit contrasty and saturated in color.

Ver.B is a starless version generated by starnet++ and then further processed.

Ver.C (final) has a lower contrast and saturation, for those with a lighter taste, and is probably safer for most monitors.

The original image has about 270 mega pixels. To avoid crashing your browser, here I only upload a 0.4x reduced version. A full-resolution version can be browsed in this Gigapan link:
http://www.gigapan.com/embeds/YLWhWAsO4d4

If you search very carefully along the left border of this image, you may find two very interesting tiny objects. One is the planetary nebula PN Hf 38, which has a colorful peanut-shaped ring. The other is the Wolf-Rayet star WRAY 15-682, which has a thin red shell around it. To save the fun for you, I will not further indicate where they are. There are also many other small or subtle nebulas in this image.

This picture probably concludes my endeavor on this target for my entire astrophotography life. With my style of travel imaging, I do not see possibilities of dramatically improving this image unless something in imaging technology fundamentally changes.

Comments

Author

whwang
Wei-Hao Wang
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The Great Carina Nebula, 





    
        

            Wei-Hao Wang