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Alert Notice 534: Nova Sgr 2015 No. 4 = PNV J18225925-1914148 [V5850 Sgr]

November 3, 2015

Event: Nova Sgr 2015 No. 4 = PNV J18225925-1914148 [V5850 Sgr]

Independent discovery by:  
 - Shigehisa Fujikawa (Kan'onji, Kagawa, Japan, reported via I. Endoh,
National Astronomical Observatory of Japan, Mitaka, Tokyo)
 - Hideo Nishimura (Kakegawa, Shizuoka-ken, Japan, reported via S.
Nakano (Sumoto, Japan))
 - Minoru Yamamoto (Okazaki, Aichi-ken, Japan, reported via S. Nakano)

Discovery magnitude:
 - Fujikawa: 11.8 unfiltered (with Minolta 120-mm f/3.5 lens +
BITRAN BN-51LN camera)
 - Nishimura: 11.5 unfiltered (with 200-mm f/3.2 lens + Canon EOS 5D)
 - Yamamoto: 11.0 unfiltered (with 135-mm f/3.5 lens + Canon EOS 5D)

Discovery date:
 - Fujikawa: 2015 October 31.386 UT (see Note b)
 - Nishimura: 2015 October 31.376 UT
 - Yamamoto: 2015 October 31.392 UT

Coordinates (2000.0):  R.A. 18 22 59.35  Dec. -19 14 11.8 (from VSX)

Spectra:
 - Spectra obtained by Mitsugu Fujii (Kurashiki, Okayama, Japan, reported by K. Ayani, Bisei Astronomical Observatory) on 2015 November 2.417 UT and November 3.389 UT indicate the object is a nova. Fujii's spectrograms are posted at http://otobs.org/FBO/etc/pnv_j18225925-1914148.htm.
 - A long-exposure low-resolution obtained on Nov. 2.758 UT by U. Munari (Istituto Nazionale di Astrofisica, Padova Astronomical Observatory) and U. Sollecchia (Asiago Novae and Symbiotic Stars collaboration) also indicate the object to be a nova.  
 - Munari also obtained a low-resolution spectrogram on Nov 3.718 that indicates the object has the typical spectrum of a He/N nova.

Observing recommendations: This nova is faint, but observations of all types (visual, CCD, DSLR, spectroscopy) as instrumentation permits are strongly encouraged as this nova evolves.

Charts: Charts for Nova Sgr 2015 No. 4 may be created using the AAVSO Variable Star Plotter (VSP) at http://www.aavso.org/vsp. Be sure to include spaces in the name as shown.

Observations reported to the AAVSO (all observations are from CBET 4159):
2015 Oct. 25.382 UT, <11: (unfiltered CCD, M. Yamamoto);
28.387, <12.7 (unfiltered CCD, H. Nishimura);
31.406, 11.7 (unfiltered CCD, S. Fujikawa);
31.70597, 11.3 CR (G. Masi, remotely with 17"-f/6.8 robotic unit, Virtual Telescope Project facility, Bellatrix Astronomical Observatory in Ceccano, Italy);
Nov. 01.0527, 14.30 B (S. Kiyota, Kamagaya, Japan, remotely with 0.50-m f/4.5 CDK astrograph + FLI-PL11002M CCD at iTelescope.NET, Mayhill, NM, USA);
01.0527, 12.96 V (Kiyota);
01.0527, 11.63 Rc (Kiyota);
01.0527, 10.28 Ic  (Kiyota);
01.373, 11.8 (unfiltered CCD, T. Noguchi, Chiba-ken, Japan);

Submit observations: Please submit observations to the AAVSO International Database using the name NOVA SGR 2015 NO. 4. Be sure to include spaces in name as shown. Once a GCVS name has been assigned, please use that name.

Notes:
a. Announced in IAU Central Bureau for Astronomical Telegrams Central Bureau Electronic Telegram 4159 (Daniel W. E. Green, ed.). Assigned the name PNV J18225925-1914148 when posted to the IAU CBAT Transient Object Confirmation Page (TOCP) at http://www.cbat.eps.harvard.edu/unconf/tocp.html. Most of the information in this Alert Notice is taken from CBET 4159.

b. Although Nishimura's discovery image was obtained earlier, Fujikawa's report was received at the Central Bureau for Astronomical Telegrams earlier.

c. P. Schmeer (SPK, Bischmisheim, Germany), reports that the nova is 32' SE of the Cepheid variable Y Sgr. He also reports that USNO-B1.0 0707-0560364 (R1=19.73, R2=21.44) is 1.4" from the position reported by G. Masi (see below).

d. Position end figures:
 - H. Nishimura, 2015 Oct. 31.376 UT, 59.25s, 14.8".
 - S. Fujikawa, 2015 Oct. 31.386, 59.33s, 06.8".
 - M. Yamamoto, 2015 Oct. 31.392, 59.10s, 15" (+/-5") (via Nakano).
 - G. Masi, 2015 Oct. 31.70597, 59.29s, 12.8" (+/-20").
 - T. Noguchi, 2015 Nov. 01.373, 59.29s, 12.4".

e. Images:
 - H. Nishimura, discovery image, 2015 Oct. 31.376 UT:
     http://www.oaa.gr.jp/~oaacs/image/PNinSgr20151031.jpg
 - S. Kiyota, 2015 Nov. 01.0527:
     http://meineko.sakura.ne.jp/ccd/PNV_J18225925-1914148.jpg
 - T. Noguchi, 2015 Nov. 01.373:
     http://park8.wakwak.com/~ngc/images/PNVinSgr_20151101.jpg

This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.

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