Dark spot

• by GinTonic86

  can someone tell what the dark spot, down-right next to the center could be?

  Posted November 13, 2017 7:46 PM

• by Budgieye moderator

  Good question. When I zoom in using cntr +, It doesn't have the sharp edges of a cosmic ray being cut out. Anyone else have an opinion?

  Probably an artifact of some sort.

  It can't be a planet nine or similar, because it is staying in the same place for a long time, while the 2 colour images were taken.

  It would be wonderful if it were the first discovery of a wandering black hole. Most black holes in galaxies are surrounded by a bright accretion disk.

  SDSS

  http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=180.54404834&dec=-0.52219359

  DECaLS

  http://legacysurvey.org/viewer?ra=180.5440&dec=-0.5224&zoom=16&layer=decals-dr2

  PanSTARRS

  http://ps1images.stsci.edu/cgi-bin/ps1cutouts?pos=180.54405004%2C-0.522&filter=color&filter=g&filter=r&filter=i&filter=z&filter=y&filetypes=stack&auxiliary=data&size=100&output_size=512&verbose=0&autoscale=99.500000&catlist=

  Posted November 14, 2017 6:46 AM

• by c_cld

  No black spot but white bad pixels in r band: that's why there is a squared blue tint in AGZ000dyje

  

  cutout image from dataset http://ds.astro.rug.astro-wise.org:8000/KiDS_DR3.0_181.0_-0.5_r_sci.fits (1.4GB !)

  worth reading http://www.eso.org/rm/api/v1/public/releaseDescriptions/82 in particular Image de-trending of the raw data

  Posted November 14, 2017 12:03 PM

• by Budgieye moderator

  Thank you c_cld. So just some bad pixels. EDIT: I can see now that it is blue, not black.

  Posted November 14, 2017 1:53 PM

• by Ghost_Sheep_SWR in response to c_cld's comment.

  oh lol 1.4GB, they ain't playing around! (ouch!)

  Nice work c_cld, so much more obvious with your FITS cutout image thanks 😃

  Posted November 15, 2017 9:14 PM