Finally a possible nova for southern observers!
TCP J17140253-2849233 (N:)
RA 17h14m02.53s, DEC -28°49'23.3" (J2000.0)
2018 Mar. 10.8138 UT, 9.5 mag (CCD, unfiltered)
Discoverers: Koichi Nishiyama and Fujio Kabashima (Japan)
Confirmed by Akira Takao (Kitakyusgu, Japan):
2018 Mar. 10.753 UT, 9.5 mag (CCD, unfiltered)
Latest ASAS-SN Sky Patrol observation (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K): 2018 Mar. 6.3623 UT, fainter than 15.5 mag.
No previous outbursts/eruptions were recorded by them since 2016 March:
Spectroscopy and precise astrometry are urgently required.
2018 03 10.805 UT
Discovered by H. Nishimura on 2018 Mar. 10.805 and T. Kojima on 10.807 UT, independently. Kojima gives mag = 9.5, position end figures 02s.50, 23".5. Nothing is visible at this location both images on March 3.812 taken by Kojima (limiting mag= 12.0) and Mar. 2.836 UT by Nishimura (14.7). Nishimura's image at http://www.oaa.gr.jp/~oaacs/image/PNVinOph2018.jpg
2018 03 10.8138 UT
Koichi Nishiyama and Fujio Kabashima report the discovery of a possible nova (mag. = 9.5) in Oph on two 40-s unfiltered CCD frames taken around 2018 Mar. 10.81377 UT (limiting magnitude = 13.3), using a 120-mm f/4 camera lens (+FLI 09000 camera). We have confirmed immediately the appearance of our discovery this PN on five 10-s unfiltered CCD frames taken around 2018 Mar 10.830 UT (limiting magnitude = 18.3) using a 0.50-m f/6.8 reflector (+FLI 1001E camera). (lens magnitude of referred catalogue Hipparcos, others reference catalogue GSC-ACT). Nothing is visible at this location on two past survey frames taken on 2018 Mar 03.815 UT (limiting mag. = 13.3) nor on DSS, USNO-B1.0, it was detected mag = 10.9 on Mar. 09.813 UT (limiting mag. = 13.2). We have checked in Minor Planets. 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.
Spectroscopic classification of TCP J17140253-2849233 as a Galactic nova
The spectrum shows strong Balmer lines which exhibit P-Cygni profiles, with the edge of the Hα absorption component indicating a maximum velocity of -1200 km/s. O I 7773 Å is also seen with a P-Cygni profile. We identify several Fe II lines, including those at 4584, 4924, 5018, 6148, 6248 and 6456 Å. N I (7468, 7442, 7424 Å) is seen mainly in absorption, with two clear components, a lower velocity one with a minimum at -400 km/s and one at -700 km/s. The Si II 6347 and 6371 Å lines, along with Mg II (4481 Å), show a similar structure, as do a number of the Fe II lines.
This spectrum shows TCP J17140253-2849233 is a Galactic nova (Fe II type) in the early stages of an eruption.
The color indices of this nova are, in comparison to several of the other recent bulge novae, comparatively small. Earlier today the B-V color was only about +0.7.
AAVSO Alert Notice 622 summarizes the discovery and reports on the status of N Oph 2018 No. 2 (TCP J17140253-2849233 = PNV J17140261-2849237). Please see notice for details.
Many thanks, and Good observing,
Elizabeth Waagen, AAVSO HQ