[vsnet-alert 20649] Re: PNV J16521887-3754189: new transient (12 mag) in Scorpius

[Patrick Schmeer]

TOCP update:

2017 02 10.7018 UT

Photometry results were B=14.73, V=14.10, Rc=11.781
and Ic=12.48 with 0.50-m f/4.5 CDK astrograph + FLI
PL6303E at iTelescope.NET, Siding Spring Observatory,
NSW, Australia. Position end figures were 18.63 and
16.44 in RA and Dec.

http://meineko.sakura.ne.jp/ccd/PNV_16521887-3754189.jpg

Seichiro Kiyota (Kamagaya, Japan)

http://www.cbat.eps.harvard.edu/unconf/followups/J16521887-3754189.html

----------------------------------

Kiyota-san's astrometry places PNV J16521887-3754189
only 0.3" from 2MASS J16521864-3754166.
See also the discovery report ("Note a red star within
several arc seconds.") and Sebastian Otero's VSX remark:
https://www.aavso.org/vsx/index.php?view=detail.top&oid=476654

Magnitudes from a few catalogues:

USNO-B1.0 0520-0568078
R1= 15.04, B2= 18.54, R2= 15.86, I= 12.46

GSC2.3 S8V6023335
F= 16.30, j= 20.16, V= 16.97, N= 13.14

2MASS J16521864-3754166
J= 10.282, H= 9.104, K= 8.596

WISE J165218.64-375416.5
W1= 8.437, W2= 8.399, W3= 7.954, W4= 7.950

Regards,
Patrick

--------------------------------------------
Patrick Schmeer <pasc1312-aavso at yahoo.de> wrote:

Subject: PNV J16521887-3754189: new transient (12 mag) in Scorpius

PNV J16521887-3754189  (CV:)

Discoverer: Hideo Nishimura (Shizuoka-ken, Japan)

R.A. 16h52m18.87s  Decl. -37°54'18.9"  (J2000.0)
2017 Feb. 1.862 UT, 11.7 mag (CCD, unfiltered)

Discovered by H. Nishimura, Shizuoka-ken, Japan,
on three 10-s frames using 200-mm f/3.2 lens +
a Canon digital camera, who writes nothing is
visible at this location on his frames taken
before 2017 Jan. 25.872 UT, but he found a star
(mag.= 12.5) on 2017 Jan. 30.868, mag.= 12.1 on
Feb. 2.857 and mag.= 12.7 on Feb. 6.836 UT.
Note a red star within several arc seconds.
Also Kaneko reports mag.= 12.1 (R 11.4, V 13.3,
B 15.2) on 2017 Feb. 6.68 UT. 

http://www.cbat.eps.harvard.edu/unconf/followups/J16521887-3754189.html

This transient is only 6.7' north of mu2 Scorpii
(V= 3.6 mag).

Spectroscopy and time-resolved photometry are
urgently required.

Clear skies,
Patrick