Return to the Cloudy Nights Telescope Reviews home pageAstronomics discounts for Cloudy Nights members
· Get a Cloudy Nights T-Shirt · Submit a Review / Article

Click here if you are having trouble logging into the forums

Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User

Observing >> Deep Sky Observing

Pages: 1
reedcbr55
member
*****

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 iTelescope.net 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)


Post Extras: Print Post   Remind Me!   Notify Moderator  
GlennLeDrew
Postmaster
*****

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.

Post Extras: Print Post   Remind Me!   Notify Moderator  
nytecam
Postmaster


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.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Tony Flanders
Postmaster
*****

Reged: 05/18/06

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

Quote:

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."


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1


Extra information
4 registered and 11 anonymous users are browsing this forum.

Moderator:  Dave Mitsky, Phillip Creed, okieav8r 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 367

Jump to

CN Forums Home


Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics