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PNV J18580379+1701265: new transient (12.1 mag) in Aquila

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SPK
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PNV J18580379+1701265: new transient (12.1 mag) in Aquila

PNV J18580379+1701265 (UG:)

Discoverer: Hideo Nishimura (Shizuoka-ken, Japan)

R.A. 18h58m03.79s Decl. +17°01'26.5" (J2000.0)
2017 Jan 20.857 UT, 12.1 mag (CCD, unfiltered)

Discovered by H. Nishimura, Shizuoka-ken, Japan, on three 13-s frames using 200-mm f/3.2 lens + a Canon digital camera, who writes nothing is visible at this location on his recent frame taken on 2017 Jan. 17.860 UT. An image at http://www.oaa.gr.jp/~oaacs/image/PNinAql.jpg

http://www.cbat.eps.harvard.edu/unconf/followups/J18580379+1701265.html

The bright (FUV= 12.65, NUV= 12.43 mag -> Previous outburst? Dwarf nova??) UV source GALEX J185803.7+170125 is only 1.4" from the transient's reported position.
This UV source is probably identical with USNO-B1.0 1070-0419935 (18 mag).

Visual magnitude estimate by Patrick Schmeer, Bischmisheim, Germany:
PNVJ18580379+1701265 20170121.249 122 SPK
Sequence: APASS (V magnitudes)
Instrument: 203-mm SCT

Spectroscopy and time-resolved photometry of this transient are urgently required.

Clear skies,
Patrick

AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484