SDSS J214807.80+293848.0 - AGN or CV?

Hi all,

I noticed this object that seemed to be of high amplitude variable nature, being relatively faint in SDSS9 (around mag +20.5 visually). However, in POSS-II Blue the object is of mag +16.4 (USNO-B1.0) and the GSC2.3 has it listed at  +17.0 (Blue). The POSS-I O blue plates show it at mag +20.1 (USNO-B1.0). The object is also visible in GALEX.

Coordinates (J2000.00):  21 48 7.80 +29 38 48.72

It is also listed as USNO-B1.0 1196-0562514 and 

The object was listed as a possible Quasar candidate acc. to Vizier (SDSS DR10 catalogue of candidate quasars, Brescia et al., 2015), which makes it seem like the brightening is due to an AGN. It does look identical to the other objects listed in that catalogue.

However, the object looks oddly like many confimed and candidate CVs, acc. to their colorimetry in SDSS and appearance in GALEX (see attachement). Many CV candidates from the CSS also appeared alot brighter in DSS Red or Blue images, with a similar magnitude range as SDSS J214807.80+293848.0 as seen in DSS2-Blue and SDSS. It also looked alot like a confirmed CV candidate found by ASAS too.

I was going to add this object to the VSX before I saw it was listed as a possible Quasar candidate. 

I'm really not sure what this object is, but it did seem rather interesting to bring up.

Thank you for your help in clearing things!

Best regards,

Trygve Prestgard