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Observation by Tim Haymes: SN 2021gmj in NGC 3310

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Tim Haymes


Tim Haymes


2021 Mar 21 - 23:16


2021 Mar 22 - 00:45



  • C11 at F5.5
  • QHY174m-gps

30s x 14 stacked


Nr Oxford

Target name

Super Nova 2021gmj


SN 2021gmj in NGC 3310

About this image

Cloud was moving in, and this was causing some deterioration in transparency.  14 x 30s  FITS files stacked with darks as TIFF and stretched in Photoshop CS2.  The image is cropped to show the galaxy more clearly. The SN is indicated on the image. 

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Tim Haymes
Tim Haymes, 2021 Mar 22 - 22:33 UTC

I used ASTAP and then Astrometrica. The magnitude (UCAC4) was 14.9 but this was including the spiral arms, so i tentatively put the magnitude at 15.3 +/-0.2 ( no filter).

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