SDSS Link incorrect

• by metalmania

  The link to SDSS doesn't seem to be correct - it centers on an object to the right of this one.

  Posted October 29, 2015 11:08 AM

• by KWillett scientist, admin, translator

  Hm - thanks, you're correct. That's the first instance I've seen of that. Has this happened with any other objects in DECaLS/SDSS?

  Posted October 29, 2015 3:55 PM

• by metalmania

  That's the only one I've come across, but not looking very long.

  Posted October 29, 2015 4:20 PM

• by williamaskew

  no its more common than you would think, or hope

  Posted October 29, 2015 9:27 PM

• by ElisabethB moderator

  I hope you made a note of these, so they can be corrected !

  Could you please post the identifications (AGZnumbers)

  Thanks ! 😄

  Posted October 29, 2015 9:40 PM

• by metalmania

  agz000az7y - seems to center on a star rather than the spiral just below it.

  I think something strange with this too, SDSS centers on the pea which is off-center.
  AGZ000bdeh

  Posted October 29, 2015 10:15 PM

• by metalmania

  AGZ000bhnc - SDSS centers on a satellite trail above the spiral galaxy.

  Posted October 30, 2015 3:48 PM

• by metalmania

  AGZ000amtj - SDSS centers on the star at 2oclock

  Posted November 9, 2015 2:12 PM

• by Ghost_Sheep_SWR

  AGZ000b3wz centers on object classified as star, although the shape suggests they're both galaxies?

  Posted November 9, 2015 6:14 PM

• by Capella05 moderator in response to Ghost Sheep SWR's comment.

  I think the central object is a star - The algorithm that chooses what we classify sometimes gets distracted by the brightest object in the frameset.

  You could try creating a paper template that you can super-impose over the image on your screen to tell what is directly at the center? It is a trick that Els and myself use.

  Remember the template will only be valid for your particular screen resolution and screen dimensions 😃

  Posted November 10, 2015 6:55 PM

• by metalmania

  AGZ000bcmt - this one doesn't exist/can't be found in SDSS at all.

  Posted November 13, 2015 10:58 AM

• by ElisabethB moderator in response to metalmania's comment.

  Here it is : http://skyserver.sdss.org/dr9/en/tools/chart/navi.asp?ra=246.66525&dec=11.5035&opt= 😄

  You can find it in the SDSS images, but you are right, it isn't in the SDSS database.

  Posted November 13, 2015 1:48 PM

• by metalmania in response to ElisabethB's comment.

  [deleted] - I made a mistake.

  Posted November 13, 2015 2:33 PM

• by Budgieye moderator

  Hmm, image is just outside of mapped zone even in dr12, but has a spectrum, somewhere. I wonder how to link onto it?

  

  http://skyservice.pha.jhu.edu/DR12/ImgCutout/getjpeg.aspx?ra=246.396334829875&dec=11.2877770874424&scale=0.4&width=512&height=512&opt=PS&query=&PhotoObjs=on&SpecObjs=on

  Posted November 14, 2015 5:23 AM

• by mlpeck

  If Navigate shows there should be a spectroscopic observation at a given location but clicking on that location doesn't pull anything up there are several other search tools you can use. One tool that's handy is the cross-id search, which does a cone search around a list of positions for photo or spectroscopic objects. Click on the buttons at the top for the data you want to retrieve. If you just have an object or two you can enter its position in the box, or you can upload a list of positions from a text file.

  Here's a link to the interactive spectrum page for this object: http://dr12.sdss3.org/spectrumDetail?mjd=54572&fiber=444&plateid=2531. The spectrum shows a pretty run of the mill starforming galaxy at z=0.05.

  Posted November 14, 2015 6:54 PM

• by c_cld

  May I remind you that SDSS survey is built on legacy releases up from DR1 to DR12. Back in Jan 2011, SDSS Data Release 8 differs from its predecessors, both because there is additional data, but also in the processing of the data and in some details of the data distribution. see http://www.sdss3.org/dr8/whatsnew.php

  The imaging data has been entirely reprocessed as you could see the difference in "photometric objects" in the "chart tool"

  http://cas.sdss.org/dr7/en/tools/chart/chart.asp?ra=246.4095499&dec=11.28858421

  DR7 ObjId = 587742061635895587

  and

  http://skyserver.sdss.org/dr9/en/tools/chart/chart.asp?ra=246.4095499&dec=11.28858421

  DR9 Objid= 1237667782860735668

  All objects close to the star have been washed out.

  The spectrum remains available as @mlpeck explains or also in DR7 http://cas.sdss.org/dr7/en/get/specById.asp?id=712647552872218624

  

  DR7 SpecObjID = 712647552872218624

  Hope this helps to say SDSS are fabulous databases 😃

  Posted November 15, 2015 11:19 AM

• by Budgieye moderator

  Aaah, that explains it. Thank you mlpeck and C_cld.

  Posted November 15, 2015 5:42 PM