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PNV J16521887-3754189: new transient (12 mag) in Scorpius (meanwhile confirmed as a nova)

SPK
Affiliation
Association Francaise des Observateurs d'Etoiles Variables (AFOEV)
Thu, 02/09/2017 - 13:18

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

SPK
Affiliation
Association Francaise des Observateurs d'Etoiles Variables (AFOEV)
Fri, 02/10/2017 - 18:46
Seichiro Kiyota's (Kamagaya, Japan) report (2017 Feb. 10.702 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

SPK
Affiliation
Association Francaise des Observateurs d'Etoiles Variables (AFOEV)
Fri, 02/10/2017 - 18:58
PNV J16521887-3754189 = 2MASS J16521864-3754166 (?)

Kiyota-san's astrometry places PNV J16521887-3754189 only 0.3" from 2MASS J16521864-3754166 (cf. the discovery report ["Note a red star within several arc seconds."] and Sebastian Otero's VSX remark).

Sebastian Otero
Affiliation
American Association of Variable Star Observers (AAVSO)
Sat, 02/11/2017 - 17:29
YSO?

So it seems that the 2MASS object is the variable star.
The fact that it shows a rather blue color now (B-V= 0.7 or so) compared with the JHK colors in quiescence suggests it might be a YSO. Maybe an EXor or FUor outburst.
So spectroscopy and long-term photometry are needed to confirm this or not.

hambsch
Affiliation
Vereniging Voor Sterrenkunde, Werkgroep Veranderlijke Sterren (Belgium) (VVS)
Sat, 02/11/2017 - 17:41
Observations from Chile

Hi,

I also observed it the past two nights showing B=14.7, V=14, I=12.

Josch

 

SPK
Affiliation
Association Francaise des Observateurs d'Etoiles Variables (AFOEV)
Mon, 02/13/2017 - 07:57
Magnitudes from several 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

SPK
Affiliation
Association Francaise des Observateurs d'Etoiles Variables (AFOEV)
Mon, 02/13/2017 - 08:00
Confirmation as an He/N nova (ATel #10071)

Jay Strader et al. (The Astronomer's Telegram #10071):
We report the spectroscopic classification of the transient PNV J16521887-3754189 as a new Galactic nova.
...
The prominence of He emission lines and the absence of Fe II lines indicates a classification as an He/N nova.
...
http://www.astronomerstelegram.org/?read=10071

Regards,
Patrick

weo
Affiliation
American Association of Variable Star Observers (AAVSO)
Mon, 02/13/2017 - 20:02
Nova in Scorpius - PNV J16521887-3754189

AAVSO Alert Notice 568 reports on the discovery of a nova in Sco - PNV J16521887-3754189. Please see the notice for details and observing instructions.

Many thanks and good observing!

Elizabeth Waagen, AAVSO HQ