Blinking object


https://www.legacysurvey.org//viewer/?ra=239.6281&dec=-3.7784&layer=unwise-neo4&zoom=13

I’m new to this platform. I was viewing this portion of the sky and I noticed an object (or some glitch) that seems to blink. The Gaia catalog contains two neighbouring objects flanking the “blinking thing”… What could it be?

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Barely visible in PanSTARRS


http://ps1images.stsci.edu/cgi-bin/ps1cutouts?pos=239.6281%2C+-3.7784&filter=color&filter=g&filter=r&filter=i&filter=z&filter=y&filetypes=stack&auxiliary=data&size=512&output_size=512&verbose=0&autoscale=99.500000&catlist=

Not in SDSS or DECaLS footprint

NED has Infrared Source nearby
https://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Near+Position+Search&in_csys=Equatorial&in_equinox=J2000.0&lon=239.6281d&lat=-3.7784d&radius=1.0&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&z_constraint=Unconstrained&z_value1=&z_value2=&z_unit=z&ot_include=ANY&nmp_op=ANY&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=Distance+to+search+center&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES

I don’t know, anyone else?

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I browsed around a bit, and it seems that there are a lot of those blinking smudges. They don’t seem to have any regularity in where they appear, so they can’t be, for example, lens reflections. (The WISE/unWISE lens flares look a bit like these.)

WISE/unWISE lens flare: http://byw.tools/wiseview#ra=243.7138&dec=-3.0130&size=500&band=3&speed=1276&trimbright=96.94&linear=0.907&color=gray&mode=percent&coadd_mode=pre-post&zoom=4&border=0

Also in the DR8 footprint area DR8 images show nothing.
http://byw.tools/wiseview#ra=238.5242&dec=-1.2712&size=500&band=3&speed=1276&trimbright=96.94&linear=0.907&color=gray&mode=percent&coadd_mode=pre-post&zoom=4&border=0
https://www.legacysurvey.org//viewer/?ra=238.5242&dec=-1.2712&layer=unwise-neo6&zoom=12

The unWISE models really seem to enhance these things a lot.

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This is cool! Here are cutouts from the original unWISE survey, followed by neo2, neo4, and neo6 – so adding in more and more, later and later data. It looks almost like it’s an expanding shell. Planetary nebula or something? Too bad we don’t have any deeper optical coverage!

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Ahhh, diagnosed by Aaron Meisner, the time-domain WISE boss.
It’s a latent image from a bright star, which is why it only appears in every second of the time-resolved epochs – north-going vs south-going.

http://byw.tools/wiseview#ra=239.6290&dec=-3.7784&size=120.000&band=3&speed=200&trimbright=75&linear=1&color=gray&mode=fixed&coadd_mode=time-resolved&zoom=9&border=1

cheers,
–dustin

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