Duplicate objects in the ATLAS database

[katemaguire]

AT 2018avp (13:00:26.532 +18:37:09.84) discovered by ASASSN. I searched in the ATLAS database for sources at this position. Two matches were found: https://star.pst.qub.ac.uk/sne/atlas4/candidate/1130026491183709000/ (0.48) at 13:00:26.52 +18:37:09.7 https://star.pst.qub.ac.uk/sne/atlas4/candidate/1130026411183713100/ (0.69) at 13:00:26.50 +18:37:10.9

From the images and light curve, the two objects appear to be the same but the former has more data at >3 sigma.

[ormcbrien]

There's a few of these duplicate objects coming in in the eyeballing. I'll add a few examples as I find them.

Searching the RA and Dec for this object, an AGN: https://star.pst.qub.ac.uk/sne/atlas4/candidate/1073251660012900300/ gives two results. The one above at 0.06'' and this one: https://star.pst.qub.ac.uk/sne/atlas4/candidate/1073251510012857000/ at 1.06''.

Looking at the images and lightcurves shows these are the same object, however we've been collecting data on the first object for about twice as long as the second.

[ormcbrien]

Here's another one, this time an ORPHAN

Searching the RA and Dec for: https://star.pst.qub.ac.uk/sne/atlas4/candidate/1142315630304235400/ gives this object at 0.32'' and another at 0.48'': https://star.pst.qub.ac.uk/sne/atlas4/candidate/1142315940304233800/

These two have the same lightcurve barring a few non-detections prior to the first detection in the first object.

[ormcbrien]

I have an odd one here.

Searching the RA and Dec for this NT: https://star.pst.qub.ac.uk/sne/atlas4/candidate/1072256071553809400/ gives itself at 0.21'' and a SN at 0.55'': https://star.pst.qub.ac.uk/sne/atlas4/candidate/1072256531553810000/

We've been collecting data on the NT for about 200 days, but on the SN for just over 90 days.

[ormcbrien]

One more here where both objects are classified as SNe.

Searching for the RA and Dec of this object: https://star.pst.qub.ac.uk/sne/atlas4/candidate/1092202661023939700/ gives this object at 0.47'' and another at 1.82'': https://star.pst.qub.ac.uk/sne/atlas4/candidate/1092202581023943800/

The exposures for these are identical (down to two frames being unavailable in each) and the lightcurves show the first object has been observed by us for twice as long as the second object (~200 days, vs ~100 days).

[smarttgit]

And these two are the same but have two entries under different names.

ATLAS18nkq https://star.pst.qub.ac.uk/sne/atlas4/candidate/1202202390182255800/

and ATLAS18nkr https://star.pst.qub.ac.uk/sne/atlas4/candidate/1202202350182300900/

[Lightbulb500]

I've just come across this pair

ATLAS18nnh https://star.pst.qub.ac.uk/sne/atlas4/candidate/1134926941262743200/

ATLAS18nni https://star.pst.qub.ac.uk/sne/atlas4/candidate/1134927201262744600/

It's a previously identified object that was only flagged today by ATLAS. I've promoted 18nnh as it has a more complete light curve and have moved 18nni to the attic

[Lightbulb500]

Another few examples.

ATLAS18mgj - From the start of March https://star.pst.qub.ac.uk/sne/atlas4/candidate/1144310451172817500/

Its 'new' duplicate ATLAS18nnk https://star.pst.qub.ac.uk/sne/atlas4/candidate/1144310291172820200/

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ATLAS18nnq - Promoted as has slightly more data https://star.pst.qub.ac.uk/sne/atlas4/candidate/1130026491183709000/

ATLAS18nnr https://star.pst.qub.ac.uk/sne/atlas4/candidate/1130026411183713100/

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ATLAS18nns https://star.pst.qub.ac.uk/sne/atlas4/candidate/1114116251215625200/

ATLAS18nnt https://star.pst.qub.ac.uk/sne/atlas4/candidate/1114116241215621300/

[MarkMagee]

ATLAS18qjm discovered almost one month ago and classified https://star.pst.qub.ac.uk/sne/atlas4/candidate/1224928020242301600/

Duplicate flagged in the eyeball list. I've promoted to the attic https://star.pst.qub.ac.uk/sne/atlas4/candidate/1224928100242258100/

[genghisken]

I've left this issue open. There's a long standing issue to merge duplicates, but in the meantime, I've added code to stop duplicates being promoted to the Good list.