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strongmanmike2002 | all galleries >> Galleries >> Comparisons with images by Hubble and other large telescopes > The Southern Crab - Hubble Comparison
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HST AG12 + SXVR-H694

The Southern Crab - Hubble Comparison

Click on image to see a wider field view

A comparison with Hubble helps to distinguish the various features I have captured in this
tiny object - the set of inner bright hourglass rings together are less than 10 arc sec across.

At a distance of about 10,000 light years, this tiny planetary nebula Hen2-104 in Centaurus
has an apparent size of just 80" X 40" making its actual size about 6.5 light years in diameter.
Hen2-104 is a Symbiotic star system composed of a Mira type giant and a hot white
dwarf star in close proximity. This nebula is known as the Southern Crab Nebula due to its
shape resembling the claws and legs of a crab.

An excellent paper on Hen 2-104 can be found here:

Orion Optics UK AG12 F3.8
Starlightxpress SXVF-H694, SX USB CFW, SX OAG unit + Atlas Focuser
SIIHaOIIIRGB = 432 360 375 45 45 45 = 21.7hrs total exposure (bin 1X1)
Using Astronomik 6nm Narrowband filters and RGB Deep Sky filters
-20C chip temp, flats used but no dark frames were used.
Focal length 1120mm
Image scale 0.84"/pix
Guide Camera: Starlightxpress Lodestar

Taken over 3 nights - 15, 27 and 30 April 2017, some moon, average to good seeing.

Equipment setup:

Some links to equipment used to take this image:

Orion Optics UK

StarlightXpress CCD Cameras and imaging equipment

Finger Lakes Instrumentation CCD cameras:

Astro Shop (Aus)

Astro-Elecronic FS2 scope GOTO controller:

Gerd Neumann and Astronomik filters:

MSB Software & Astroart 6

Catseye Collimation

STAR Atlas:PRO planetarium software:

other sizes: small medium large original auto
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Sakib 03-May-2017 01:07
How about doing a comparison of the Ha, OIII and SII?