Ring of galaxies / green star / cosmic ray
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by
bluemagi
Thought I look around when I had time because this looked interesting. Keep going right at 3:00 at DEC:213.73307 RA:-0.4905. Its a green-aquamarine star ? I am starting to get a complex finding things.
Posted
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by
Budgieye
moderator
Nice ring of galaxies. Paper http://articles.adsabs.harvard.edu//full/2004MNRAS.351..265D/0000265.000.html but there are no nice pictures.
I'm not sure which greenish star you mean. Go into
http://legacysurvey.org/viewer?ra=213.76742454996494&dec=-0.490359234519434&zoom=14&layer=decals-dr2
left click on the star, then click on "Link Here" , the screen will refresh, the star will be in the middle of the screen, and the location address will be in the address bar in your computer's search screen. Copy the address (maybe by clicking on it then right click to bring up your edit screen. Then paste onto your post.
If you still have trouble, we'll try it again in more detail.
If it is this one
http://legacysurvey.org/viewer?ra=213.6688&dec=-0.4917&zoom=15&layer=decals-dr2
it is a funny green because it is an artifact, the area is missing the red in the image.
Posted
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by
bluemagi
http://legacysurvey.org/viewer?ra=213.6156&dec=-0.4953&zoom=16&layer=decals-dr2.
Budgieye, I had my son help me to do this. I hope it works. Let me know.
Posted
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by
bluemagi
This is the SDSS J141455.91-002925.6 . Object id:1237648720708632632. Thanks for your help.
Posted
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by
Budgieye
moderator
in response to bluemagi's comment.
Well, it is not a transient, since there is a strange blob in both star surveys taken about 10 years apart.
DECaLS - pink and blue star
http://legacysurvey.org/viewer?ra=213.6156&dec=-0.4953&zoom=16&layer=decals-dr2
SDSS green object beside blue star
http://skyserver.sdss.org/dr12/en/tools/explore/Summary.aspx?id=1237648720708632632
SIMBAD says no astronomical object found.
Posted
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by
Budgieye
moderator
in response to bluemagi's comment.
edited because I made a mistake copying the rac, dec, as spotted in the next post
Posted
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I think that's not the object In DR7, it's visible up till DR1
http://cas.sdss.org/dr7/en/tools/explore/obj.asp?ra=213.732957&dec=-0.490470
Seems there are two coordinates / objects in this thread 😃
But it is strange yes: very green, and much better visible in SDSS than DECaLS DR2?
Posted
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by
bluemagi
I got it from the dr.9 skyserver.sdss. When I first saw it I thought it might be another cosmic ray. I don't think so, compared the cosmic ray one and this and it isn't.
Than I remembered the first bean was aquamarine when it was found in 2012. So thats when I decided to mention it. Its really weird. I can't come up with an answer for it. ThanksPosted
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by
c_cld
in response to bluemagi's comment.
Looking at the magnitudes there is only r-band with small err, other bands are sky noise with big err. In flags you have "cosmic ray".
The "explore" thumbail is the cutout from the same unique frame for all DR7 till DR12. http://mirror.sdss3.org/fields/runCamcolField?run=756&camcol=2&field=654
Your SQL command was:
SELECT
p.objID, p.ra, p.dec, p.run, p.rerun, p.camcol, p.field, p.obj,
dbo.fPhotoTypeN(p.type) as type,
p.modelMag_u, p.modelMag_g, p.modelMag_r, p.modelMag_i, p.modelMag_z
FROM #upload u
JOIN #x x ON x.up_id = u.up_id
JOIN PhotoTag p ON p.objID = x.objID
ORDER by p.runobjID ra dec run rerun camcol field obj type modelMag_u modelMag_g modelMag_r modelMag_i modelMag_z
1237648673445183542
213.73223835 -0.49044518 745 301 2 367 54 STAR 16.757511 15.716969 15.375721 15.254261 15.8954651237648673445183544
213.73223206 -0.49044339 745 301 2 367 56 STAR 16.761023 15.717899 15.377205 15.253984 15.901811237648673445183543
213.73223206 -0.49044339 745 301 2 367 55 STAR 16.761017 15.717897 15.377203 15.253981 15.9017651237648720708632630
213.73223603 -0.49044192 756 301 2 654 54 STAR 16.730118 15.702887 15.382227 15.237023 15.2003251237648720708632631
213.73223574 -0.49044165 756 301 2 654 55 STAR 16.732998 15.704675 15.402096 15.237015 15.2058541237648720708632632
213.73296887 -0.49045585 756 301 2 654 56 STAR 24.634377 23.201994 18.883179 24.361698 22.827321237648720708632629
213.7322433 -0.49044046 756 301 2 654 53 STAR 16.726336 15.702525 15.381188 15.234994 15.199216Looking at the second frame http://mirror.sdss3.org/fields/runCamcolField?run=745&camcol=2&field=367
no green star /cosmic ray shows up close to 1237648720708632632.Conclusion: Cosmic ray 😃
Posted
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by
Budgieye
moderator
C_cld, thank you for looking that up. (EDIT:- it is the nicest looking cosmic ray hit that I've seen!)
So the SDSS dr7 is the same image as the SDSS dr8 and up?
modified Julian date of green images from Field
dr12 51259.38797511
dr7 51259.380000 (5.1259388E4)
Modified Julian date converter http://pdc.ro.nu/mjd.cgi
so the date taken was March 9, 1999
Posted
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Lol was doing the exact same check for the ssd 😃 also wondering about the right date, i get
mjd_r 51259.38797511
1999-03-22 09:18 UT
Same as the given Mjd-date in SDSS DR12 seems right, now i'm not so sure....
EDIT
***************** SBFIND v2.7-linF95 2016-Apr-17 04:21:47 *****************
Observation Date = 1999-Mar-09 09:18:00 (2451246.887500 UT)
***************** SBFIND v2.7-linF95 2016-Apr-17 04:24:28 *****************
Observation Date = 1999-Mar-22 09:18:00 (2451259.887500 UT)
1999-03-22 09:18 seems to returning the 'right' MJD string from the small body tool itself
Posted
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by
bluemagi
Here is another cosmic ray star, if your interested, its OBJid:1237651754565828614 in SDSS dr.9. SDSS J145012.18+023031.4 thats all info I have.
Posted
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by
c_cld
in response to bluemagi's comment.
No one is interested by cosmic ray in imaging surveys, as they are artifacts difficult to get rid of along the frame corrections steps.
Your object 1237651754565828614 is a different kind of artifact of a satellite trail.
The trail was partially removed (scattered colors) in between
1237651754565828614
1237651754565828666 ,
1237651754565828959 ,
1237651754565894201 ,
1237651754565894230Posted
