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Observing >> Deep Sky Observing

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Reged: 10/08/12

Strange spot on HIP66004
      #5755143 - 03/24/13 10:44 PM Attachment (32 downloads)

I have an image of M51 that I took using the T20 telescope and camera. While I was processing the photo in Photoshop, I zoomed in on HIP66004 and noticed a strange spot on it. Anyone have any idea what it might be? I've only included a picture of the star here but can share the entire photo, if desired. Just curious

Edited by reedcbr55 (03/24/13 10:55 PM)

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Reged: 06/18/08

Loc: Ottawa, Ontario, Canada
Re: Strange spot on HIP66004 new [Re: reedcbr55]
      #5755204 - 03/24/13 11:27 PM

Looks like a dead pixel.

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Reged: 08/20/05

Loc: London UK
Re: Strange spot on HIP66004 new [Re: reedcbr55]
      #5757508 - 03/26/13 04:50 AM

Hi - welcome to CN - artifacts are possible and only identified as 'real' with a second image and slight change scope position eg any artifact 'moves' against the star background. I checked the mag 7 star [east of M51 gxy] on Sloan DSS but too bright and burnt-out!

I appreciate this is difficult with a single shot from I assume a remote scope. Check the frame for other artifacts/ hot pixels etc. For my SN hunting I always take two or more images to avoid false alarms.

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Tony Flanders

Reged: 05/18/06

Loc: Cambridge, MA, USA
Re: Strange spot on HIP66004 new [Re: GlennLeDrew]
      #5757566 - 03/26/13 06:58 AM


Looks like a dead pixel.

Seems likely. This happens to be amazingly similar to an artist's rendition of an exoplanet transiting a star. But of course the resolution of even a big professional scope with adaptive optics is 1,000 times to low to resolve this star, which lies some 400 light-years away and is no doubt a dwarf (B-V=0.234, spectral class A5, luminosity around 20 Suns, right on the main sequence).

So the "disk" is in fact entirely spurious as, no doubt, is the "planet."

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