Nova Sagittarii 2015 = PNV J18142514-2554343

[PTS]

February 18, 2015

AAVSO Alert Notice 509: Nova Sagittarii 2015 = PNV J18142514-2554343

Event: Nova Sagittarii 2015 = PNV J18142514-2554343

Discovered independently by:
- Hideo Nishimura (Shizuoka-ken, Japan)
- Koichi Nishiyama (Kurume, Japan) and Fujio Kabashima (Miyaki, Japan)

Discovery magnitude:
- Nishimura: DSLR magnitude 11.2, using 200-mm f/3.2 lens + digital
camera
- Nishiyama and Kabashima: unfiltered CCD magnitude 10.9, using a
105-mm f/4 camera lens (+SBIG STL6303E camera)

Discovery date:
- Nishimura: 2015 February 12.840 UT
- Nishiyama and Kabashima: 2015 February 12.87837 UT

Coordinates: R.A. 18 14 25.14 Dec. -25 54 34.3 (2000.0)

Spectra: Echelle spectra by Frederick Walter (Stony Brook
University) taken on the night of 2015 February 15/16 near maximum
light indicate that N Sgr 2015 is a classical Fe II nova.

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

Charts: Charts for Nova Sgr 2015 may be created using the AAVSO
Variable Star Plotter (VSP) at http://www.aavso.org/vsp.

Observations reported to the AAVSO:
2015 Feb. 10.77381 UT, 12.60 V +/-0.05 (OCN, S. O'Connor,
St. George, Bermuda);
11.841, 10.5 (T. Kojima, Gunma-ken, Japan, using 150-mm f/2.8
lens+digital camera, pre-discovery observation, via TOCP);
13.40987, 11.118 V +/-0.037 (HMB, J. Hambsch, Mol, Belgium);
13.41028, 11.059 V +/-0.043 (Hambsch);
13.41066, 10.170 I +/-0.053 (Hambsch);
13.41095, 10.134 I +/-0.054 (Hambsch);
13.76065, 10.7266 V +/-0.0024 (SPET, P. Starr, Coonabarabran,
NSW, Australia);
13.76164, 10.7319 V +/-0.0024 (Starr);
13.76265, 10.7406 V +/-0.0023 (Starr);
13.76365, 10.7295 V +/-0.0024 (Starr);
13.76462, 10.7355 V +/-0.0024 (Starr);
13.76561, 10.7365 V +/-0.0024 (Starr);
13.76661, 10.7352 V +/-0.0024 (Starr);
13.76762, 10.7284 V +/-0.0024 (Starr);
13.76860, 10.7340 V +/-0.0024 (Starr);
13.76963, 10.7292 V +/-0.0025 (Starr);
13.77093, 11.5730 B +/-0.0044 (Starr);
13.7865, 11.16 V (S. Kiyota, Kamagaya, Japan, remotely using 0.43-m
f/6.8 CDK astrograph+FLI PL16803 CCD at iTelescope.NET, Siding
Spring Australia, via TOCP);
13.7865, 10.47 Ic (Kiyota, via TOCP);
14.41110, 9.826 I +/-0.069 (Hambsch);
14.52072, 10.2 V +/-0.1 (O'Connor);
14.77753, 10.03 V +/-0.07 (O'Connor);
14.83056, 10.2 (PEX, A. Pearce, Nedlands, WA, Australia);
15.72593, 9.2894 V +/-0.0019 (Starr);
15.72693, 9.3032 V +/-0.0022 (Starr);
15.72796, 9.3107 V +/-0.0022 (Starr);
15.72898, 9.2894 V +/-0.0026 (Starr);
15.72998, 9.3058 V +/-0.0024 (Starr);
15.73099, 9.3079 V +/-0.0024 (Starr);
15.73200, 9.3054 V +/-0.0025 (Starr);
15.73300, 9.2965 V +/-0.0025 (Starr);
15.73402, 9.2965 V +/-0.0026 (Starr);
15.73503, 9.3055 V +/-0.0027 (Starr);
15.73632, 10.1222 B +/-0.0032 (Starr);
15.830, 9.0 (Kojima, via TOCP);
16.32500, 9.7 (CLUB, L. Camargo da Silva, Brazil);
16.32708, 9.5 (AAX, A. Amorim, Florianapolis, Brazil);
16.40575, 9.569 V +/-0.011 (Hambsch);
16.40616, 9.575 V +/-0.011 (Hambsch);
16.40654, 8.715 I +/-0.017 (Hambsch);
16.40683, 8.698 I +/-0.016 (Hambsch);
16.80903, 9.5 (Pearce);
17.40659, 9.603 V 0.011 (Hambsch);
17.40699, 9.616 V 0.012 (Hambsch);
17.40737, 8.581 I 0.023 (Hambsch);
17.40766, 8.558 I 0.022 (Hambsch);
17.73946, 9.3032 V 0.0021 (Starr);
17.74047, 9.2980 V 0.0023 (Starr);
17.74149, 9.3023 V 0.0024 (Starr);
17.74249, 9.3048 V 0.0022 (Starr);
17.74348, 9.3035 V 0.0024 (Starr);
17.74448, 9.2917 V 0.0024 (Starr);
17.74549, 9.2932 V 0.0024 (Starr);
17.74649, 9.3069 V 0.0022 (Starr);
17.74750, 9.3071 V 0.0023 (Starr);
17.74851, 9.3211 V 0.0025 (Starr);
17.74982,10.3444 B 0.0027 (Starr);
17.77406, 9.3 V (T. Yusa, Osaki, Japan, remotely using 0.43-m f/6.8
astrograph+CCD at iTelescopeNET, Siding Spring, NSW, Australia,
via TOCP);
17.83472, 9.8 (Pearce);

Submit observations: Please submit observations to the AAVSO
International Database using the name NOVA SGR 2015. Once a GCVS
name has been assigned, please use that name.

Notes:
a. Assigned the name PNV J18142514-2554343 when posted to the IAU
CBAT Transient Object Confirmation Page (TOCP) at
http://www.cbat.eps.harvard.edu/unconf/tocp.html

b. Nishiyama and Kabashima confirmed object's presence on five 3-s
unfiltered CCD frames taken around 2015 Feb. 12.891 UT. Nothing was
visible down to magnitude 12.5 on a survey frame taken 2015 Feb.
02.887 UT.

c. Position end figures
- S. Kiyota (Kamagaya, Japan) 25.15s, 34.66"
- Nishimura 25.24s, 32.6"
- T. Yusa (Osaki, Japan) 25.15s, 34.6"

d. Nishiyama and Kabashima report that the nearest star in USNO
B1.0 has position end figures 24.979s, 35.69", distance 2.6",
magnitudes B2=15.40, R2=14.39, I=14.66.

e. Images:
- T. Kojima (pre-discovery, Gunma-ken, Japan), Feb. 11.841 UT,
http://www.oaa.gr.jp/~oaacs/image/PnovaSgrKojima.jpg
- Nishimura (discovery), Feb. 12.852 UT,
http://www.oaa.gr.jp/~oaacs/image/PnovaSgr.jpg
- Kiyota (confirming), Feb. 13.7865 UT,
http://meineko.sakura.ne.jp/ccd/PNV_J18 ... 554343.jpg
- Yusa, Feb. 17.77406 UT, RGB color composite at
http://space.geocities.jp/yusastar77/su ... 150217.htm

Congratulations to Koichi Nishiyama and Fujio Kabashima and to
Hideo Nishimura on their independent discoveries!

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