Observation by Richard Sargent: Cosmic Horseshoe Attempt -failed!

Uploaded by

Richard Sargent

Observer

Richard Sargent

Observed

2023 Mar 15 - 00:30

Uploaded

2023 Mar 31 - 18:37

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Constellation

Leo

Field centre

RA: 11^h48^m
Dec: +19°29'
Position angle: -3°54'

Field size

0°18' × 0°15'

Equipment

C14 at f7 and Atik 460EX camera

Exposure

46 x 1 minute exposures

Target name

The Cosmic Horseshoe LRG3-757

Title

Cosmic Horseshoe Attempt -failed!

About this image

This is my failed attempt (sob)to capture the DSS March object of interest. The total imaging time of 46 minutes was too short, affected by thin cloud and eventually terminated by complete cloud cover. Not had a sufficiently clear sky since so no chance to try again. Foreground galaxy LRG 3-757 highlighted with arrow but no cosmic horseshoe visible. A very challenging object of interest!

Files associated with this observation

Cosmic_Horseshoe_20230315_rsargent.jpg (453.4 kB)

Like this image

Jeremy Shears, Alan Thomas, David Strange, Callum Potter, Mike Harlow, Grant Privett, Dr Paul Leyland, Graham Winstanley

Comments

Dr Paul Leyland, 2023 Apr 02 - 14:27 UTC

Personally I think you have picked up a hint of the Horseshoe. Look closely at the inset negative image. There is a faint disc of pixels slightly darker than the sky. Given that information, I can see the same features in the positive image. Emboldened by this, I took a screen shot and ran some magick on it. ImageMagick to be precise. It appears I can't add an image within this comment but I can try to make it available elsewhere. The bright western patch of the lensed galaxy is undoubtedly present. The northern arc is detectable to my eyes.

If you wish to take this further, please let me have the original and highest quality image stack and I will see what I can do. I've had rather lot of practice in recent years in making visible objects which are markedly fainter than the sky background.

Richard Sargent, 2023 Apr 02 - 17:48 UTC

Thanks for your comments Paul. I did see the same hints of the disc in the image that you referred to but didn't want to claim anything. I'll leave this object for another day when I can give it more time.

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