Alert Notice 622: N Oph 2018 No. 2 = TCP J17140253-2849233 = PNV J17140261-2849237 [V3665 Oph]

March 15, 2018

Event: Nova in Ophiuchus - N Oph 2018 No. 2 = PNV J17140261-2849237 = PNV J17140261-2849237  [V3665 Oph]

Discovered Independently by:
- Hideo Nishimura (Kakegawa, Shizuoka-ken, Japan, reported by S. Nakano)
- Tadashi Kojima (Tsumagoi, Gunma-ken, Japan, reported by S. Nakano)
- Koichi Nishiyama (Kurume, Japan) and Fujio Kabashima (Miyaki, Japan)

Discovery magnitude:
- Nishimura: unfiltered CCD magnitude 9.5 (using a Canon EOS 6D digital camera + 200-mm f/3.2 lens)
- Kojima: unfiltered CCD magnitude 9.5 (using a Canon EOS 6D digital camera + 200-mm f/3.2 lens)
- Nishiyama and Kabashima: unfiltered CCD magnitude 9.5 (using a 120-mm f/4 camera lens + FLI09000 camera)

Discovery date:
- Nishimura:  2018 March 10.805 UT
- Kojima: 2018 March 10.807 UT
- Nishiyama and Kabashima: 2018 March 10.814 UT

Coordinates (2000.0): R.A. 17 14 02.53  Decl. -28 49 23.3  (from VSX)
Spectra: Low-resolution spectroscopy indicating that PNV J16484962-4457032 is a Fe II type nova in the stages was obtained by S. C. Williams et al. (ATel #11398) using the FRODOSpec spectrograph on the 2-m Liverpool Telescope.

Observing recommendations: Observations of all types (visual, CCD, DSLR, spectroscopy) and multiple bands as instrumentation permits are strongly encouraged as the nova evolves. Dr. Koji Mukai (NASA Goddard Space Flight Center) recommends that observers use B, V, and I filters if possible to enable studying any color changes.

Observations reported to the AAVSO:
2018 March 02.836 UT, <14.7 (unfiltered CCD magnitude, Nishimura; via CBET 4492);
03.812, 12.0 (unfiltered CCD magnitude, Kojima; via CBET 4492);
03.815, <13.3 (K. Nishiyama and F. Kabashima; via CBET 4492);
06.3623, <15.5 V (ASAS-SN Sky Patrol observation, reported by P. Schmeer (Saarbruecken-Bischmisheim, Germany);
09.813, 10.9 (K. Nishiyama and F. Kabashima; via CBET 4492);
10.753, 9.5  (unfiltered CCD magnitude, A. Takao, Kitakyusgu, Japan; via CBET 4492);
10.81377, 9.5 (unfiltered CCD magnitude, K. Nishiyama and F. Kabashima);
10.81806 UT, 10.0( A. Pearce, Nedlands, W. Australia);
11.22847, 9.5 (A. Amorim, Florianapolis, Brazil);
11.29653, 9.4 (Amorim);
11.67600, 10.06 B +/-0.05 (S. O'Connor, St. George, Bermuda);
11.67700, 9.42 V +/-0.07 (O'Connor);
11.67800, 8.45 I +/-0.08 (O'Connor);
11.696, 10.05 B (S. Kiyota, Kamagaya, Japan, 0.43-m f/6.8 CDK astrograph + FLI PL4710 CCD (T17, iTelescope.NET), Siding Spring Observatory, NSW, Australia; via CBET 4492);
11.696, 9.53 V (Kiyota, via CBET 4492);
11.696, 9.32 Rc (Kiyota, via CBET 4492);
11.696, 8.99 Ic (Kiyota, via CBET 4492);
11.74236, 9.635 V +/-0.001 (Pearce);
11.74310, 10.189B +/-0.002 (Pearce);
11.81390, 9.4 (Pearce);
11.827, 10.22 B (K. Yoshimoto, Yamaguchi-ken, Japan, via CBET 4492);
11.827, 9.54 V (Yoshimoto, via CBET 4492);
11.827, 9.09 Rc (Yoshimoto, via CBET 4492);
11.827, 8.66 Ic (Yoshimoto, via CBET 4492);
12.32361, 9.3 (Amorim);
12.79240, 9.5 (Amorim);
13.15486, 9.8 (M. Deconinck, Artignosc sur Verdon, France);
14.16250, 10.0 (Deconinck);

Charts: Charts with a comparison star sequence for N Oph 2018 No. 2 may be created using the AAVSO Variable Star Plotter (VSP).

Submit observations: Please submit observations to the AAVSO International Database using the name N OPH 2018 NO. 2. Once a GCVS name is announced in an IAU Circular or CBET, please use that name.

Forums: N Oph 2018 No. 2 is the topic of the AAVSO Novae forum thread

a. Designated PNV J17140261-2849237 and TCP J17140253-2849233 when posted independently by Nishimura and by Kojima, and by Nishiyama and Kabashima, respectively, to the IAU Central Bureau for Astronomical Telegrams Transient Object Confirmation Page (TOCP). Unless otherwise noted and except for observations reported to the AAVSO, the information in this Alert Notice is taken from IAU CBET 4492.

b. Nishiyama and Kabashima confirmed their discovery immediately on unfiltered CCD frames taken around 2018 Mar 10.830 UT.

c. Nishiyama and Kabashima report nothing was seen on DSS or USNO-B1.0 images.

d. Nishiyama and Kabashima report the nearest star in USNO B1.0 has position end figures 02s787, 26"76, distance 4"8, magnitudes B2=17.35, R2=17.17, I=14.90.

e. Position end figures (J2000.0)
- Nishimura (2018 March 10.805 UT, discovery): 02.61s, 23.7"
- Nishiyama and Kabashima (2018 March 10.830 UT): 02.53s, 23.3"
- T. Kojima (2018 Mar. 10.807 UT, discovery): 02.50s, 23.5"
- K. Yoshimoto (2018 Mar.11.827): 02.55s, 23.7"

f. Images
- H. Nishimura (2018 Mar. 10.805 UT):
- S. Kiyota (2018 March 11.6965 UT):
- K. Yoshimoto (2018 Mar. 11.827 UT):

Congratulations to Hideo Nishimura, to Tadashi Kojima, and to Koichi Nishiyama and Fujio Kabashima on their latest discoveries!

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

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