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Alert Notice 528: Nova Sagittarii 2015 Number 3 = PNV J18033275-2816054 [V5669 Sgr]

September 29, 2015

Event: Nova Sgr 2015 No. 3 = PNV J18033275-2816054  [V5669 Sgr]

Independently discovered by:
- Koichi Itagaki (Teppo-cho, Yamagata, Japan)
- Akira Takao (Kitakyushu, Japan)
- Yuji Nakamura (Kameyama, Mie, Japan)

Discovery magnitude:
- Itagaki: 9.9 U (CCD, using a 180-mm focal length camera lens)
- Takao: 10.5 U
- Nakamura: magnitude not reported (135-mm focal length camera lens)

Discovery date:
- Itagaki: 2015 Sep. 27.4293 UT
- Takao: 2015 Sep. 27.44706 UT
- Nakamura: 2015 Sep. 27.4189

Coordinates (2000.0):  R.A. 18 03 32.70   Dec. -28 16 05.7  (from VSX)
- Itagaki: 18 03 32.75   -28 16 05.4
- Takao: 18 03 33.6   -28 16 10
- Nakamura: coordinates not reported

Spectra: The following spectra reports indicate PNV J18033275-2816054 is an Fe II nova and exhibits P Cygni profiles:
- M. Fujii (Kurashiki, Okayama, Japan), 2015 Sep. 27.487 UT (reported by K. Ayani (Bisei Astronomical Observatory) via CBET 4145); spectrogram posted at: http://otobs.sakura.ne.jp/FBO/fko/nova/pnv_j18033275-2816054.htm.
- O. Garde (Chabons, France), echelle spectra on 2015 Sep. 29.768 UT (via CBET 4145); spectrogram posted at: http://www.spectro-aras.com/forum/viewtopic.php?f=5&t=1264.
- S. C. Williams et al. (Liverpool John Moores University), 2015 Sep. 27.84 UT (ATel #8101, http://www.astronomerstelegram.org/?read=8101).

Observing recommendations: Observations of all types (visual, CCD, DSLR, spectroscopy) are strongly encouraged as this nova evolves.

Charts: Charts for Nova Sgr 2015 No. 3 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:
2015 Sep. 20.438 UT, <13.0 (K. Itagaki, Teppo-cho, Yamagata, Japan, via CBET 4145);
23.420, <12.5 (Y. Nakamura, Kameyama, Mie, Japan; camera apparently with a 135-mm focal length f/4 lens; communicated by H. Yamaoka, Kyushu University, via CBET 4145);
27.404, 9.5 (T. Kojima, Gunma-ken, Japan, Canon EOS 60+IR filter, via CBET 4145);
27.418, 9.7 (Y. Sakurai, Mito, Ibaraki-ken, Japan, pre-discovery image; Nikon D7100 + 180-mm-f.l. f/2.8 lens; communicated by S. Nakano (Sumoto, Japan); via CBET 4145);
27.420, 9.7 (Sakurai, as above, via CBET 4145);
27.44093, 9.3 U (K. Nishiyama, Kurume, Japan; 0.50-m f/6.8 RC+FLI 1001E camera, via CBET 4145);
27.48264, 9.7 TG (moonlight; KBJ, R. Kaufman, Bright, Victoria, Australia; DSLR & 200mm lens);
27.483, 9.8 (T. Noguchi, Chiba-ken, Japan; 0.23-m f/6.3 Schmidt-Cassegrain reflector, via CBET 4145);
27.50, 10.2 (nova is red; CMQ, P. Camilleri, Warners Bay, NSW, Australia; 0.41-m reflector 165x);
27.62917, 9.7 (moonlight; PEX, A. Pearce, Nedlands, W. Australia);
27.786, 9.5 (SPK, P. Schmeer, Bischmisheim, Germany; 203-mm SCT);
28.0375, 9.7 (BRJ, J. Bortle, Stormville, NY);
28.0818, 9.77 B (KSI, S. Kiyota, Kamagaya, Japan, 0.43-m f/4.5 CDK astrograph + FLI-PL6303E at Mayhill, USA, remotely, via CBET 4145);
28.0818, 9.18 V (Kiyota, as above);
28.0818, 8.83 Rc (Kiyota, as above);
28.0818, 8.48 Ic (Kiyota, as above);
28.4, 9.5 R (E. Guido, 0.43-m f/6.8 astrograph+CCD from MPC Code Q62 (iTelescope Observatory, Siding Spring), via CBET 4145);
28.47847, 9.0 (moonlight; Pearce);
28.481771-29.535463, 28 V observations 8.9568(0.0049)-9.3034(0.0053) (SPET, P. Starr, Coonabarabran, NSW, Australia);
28.482731-29.532384, 26 B observations 9.5378(0.0062)-10.0384(0.0083) (Starr);
28.49097, 9.0 TG (moonlight; Kaufman);
28.60972, 9.0 (moonlight, clouds; Pearce);
28.73611, 8.7 (BLD, D. Blane, Henley-on-Klip, South Africa);
29.47708, 9.5 (Pearce);
29.71389, 9.2 (Blane);

Submit observations: Please submit observations to the AAVSO International Database using the name NOVA SGR 2015 NO. 3. 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 4145 (Daniel W. E. Green, ed.). Assigned the name PNV J18033275-2816054 when posted to the IAU CBAT Transient Object Confirmation Page (TOCP) at http://www.cbat.eps.harvard.edu/unconf/tocp.html

b. Y. Nakamura reports nothing was visible down to 12.5 at this location on two frames taken on 2015 Sep. 23.4205 UT. Several observers confirmed the nova visually or with an image, including Kaufman, Pearce, Camilleri, Bortle, and Guido (see above for locations).

c. P. Schmeer (Bischmisheim, Germany) notes USNO-B1.0 0617-0684734 is magnitude B1=21.03, I=14.04 at position end figures 13.58s, 13.7".

d. Position end figures (2000.0)
- K. Itagaki (Teppo-cho, Yamagata, Japan), 2015 Sep. 27.429 UT, 32.75s, 05.4".
- K. Nishiyama (Kurume, Japan), 2015 Sep. 27.44093 UT, 32.74s, 05.6" (nearest star in VizieR has position end figures 32.70s, 05.7’, distance 0.54", V=20.491, I=19.115).
- A. Takao (Kitakyushu, Japan), independent discovery image, 2015 Sep. 27.447 UT, 33.6s, 10".
- T. Noguchi (Chiba-ken, Japan), 2015 Sep. 27.483, communicated by S. Nakano, 32.75s, 05.4".
- E. Guido, remotely using 0.43-m f/6.8 astrograph + CCD from MPC Code Q62 (iTelescope.Observatory, Siding Spring)), 2015 Sep. 28.4, 32.77s, 05.3".

e. Images:
- T. Kojima (Gunma-ken, Japan, Canon EOS 60 + IR filter), 2015 Sep. 27.404 UT (pre-discovery image): http://www.oaa.gr.jp/~oaacs/image/Pnova_Sgr_Kojima.jpg
- K. Itagaki, 2015 Sep. 27.429 UT (discovery image): http://www.k-itagaki.jp/images/pn-sgr.jpg
- A. Takao (Kitakyushu, Japan), 2015 Sep. 27.44706 UT, independent discovery image: https://sites.google.com/site/akitakao001/
- R. Kaufman (Bright, Victoria, Australia), 2015 Sep. 27.483 UT, confirmation image: http://i727.photobucket.com/albums/ww271/Rob_Kau/PNV%20J18033275-2816054%2027%20Sept%202015%20text.jpg~original
- T. Noguchi (Chiba-ken, Japan), 2015 Sep. 27.483 UT, communicated by Nakano, via CBET 4145: http://park8.wakwak.com/~ngc/images/PNVinSgr_20150927.jpg)
- E. Guido (remotely using 0.43-m f/6.8 astrograph + CCD from MPC Code Q62 (iTelescope Observatory, Siding Spring)), 2015 Sep. 28.4: http://bit.ly/1FwPd8O
- E. Guido (as above): animation showing a comparison between his confirmation image and the archive POSS1 Blue plate (1958-04-18): http://bit.ly/1NXp7wN

Congratulations to Koichi Itagaki, Akira Takao, and Yuji Nakamura on their independent discoveries!

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

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