Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

CBAT "Transient Object Followup Reports"

PNV J20205397+2508145

PNV J20205397+2508145   2017 09 12.5422*  20 20 53.97 +25 08 14.5  12.3 U             Vul       5 0


2017 09 12.542

Discovered by T. Kojima, Gunma-ken, Japan, who found this on three frames taken by Canon EOS 6D + 135-mm f3.2 lens and confirmed this (mag.= 12.7) taken on 2017 Sept. 12.67 UT using 200-mm f/3.2 lens. Nothing is visible at this location on a frame taken on 2017 Sept. 2.719 UT. An image at http://www.oaa.gr.jp/~oaacs/image/PNinAql2017.jpg.



2017 09 12.542

File location is An image at http://www.oaa.gr.jp/~oaacs/image/PNinVul2017.jpg.



2017 09 12.76

Five Gaia DR1 sources (in the 18–21 mag range) are within 6 arcsec of the transient's position. --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)



2017 09 12.81339

This transient was observed on 2017 09 12.81339 by Andrea Mantero from C77 - Bernezzo Observatory using 0.25-m f/4 reflector - CCD Atik 314L Scale 1,33"/pixel. Stack of 2 unfiltered b1x1 frames x 30 sec. guiding exposures, show the source at 12.8 Mag.(limiting magnitude 18.5) end figures for astrometry were AR. 20,20 54.34 s DEC. +25,08 16.1" position measured from reference stars UCAC-4 catalogue.



2017 09 12.83

One of the five abovementioned Gaia DR1 sources is only 0.3 arcsec from the position reported by Andrea Mantero. This source (G= 20.20 mag) is identical with GSC2.3 N32C046859 (j= 20.40 mag), which was already proposed by Brian Skiff (vsnet-alert message 21424) as the likely progenitor ("very blue", "Pan-STARRS Sloan 'psf' magnitudes: g = 20.41, r = 20.42, i = 20.52, z = 20.57"). --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)



2017 09 12.860

Mag. V= 12.81, B= 12.85, (B-V= +0.04), position end figures 54s.36, 15".8 observed by K. Yoshimoto, Yamaguchi-ken, Japan, using 0.43-m f/6.8 reflector + CCD, Nerpio, Spain, remotely. Image at http://orange.zero.jp/k-yoshimoto/PNV-J20205397+2508145.jpg.



2017 09 12.903

F. Campos (ARAS), Barcelona, Spain, obtained a low-resolution spectrum of this transient on 2017 Sep 12.903 UT using a 0.35-m Ritchey-Chrétien telescope, slit spectroscope 200 l/mm (3800-7200 A, resolution 8 A, 3 x 1200 sec exposures). The strong blue continuum, a narrow emission for H-alpha, the H-beta emission component filling the photospheric absorption and other absorption Balmer lines confirm that the object is a dwarf nova outburst. Spectral profile is available here: http://spectro-aras.com/forum/download/file.php?id=4389 (P. Berardi)



2017 09 13.83560

This transient was observed on 2017 09 13.83560 by Lorenzo Barbieri, Gaetano Brando, Matteo Tenti, Adriano Valvasori from Felsina Observatory using 0.40-m f/5 reflector - CCD KAF-1600 Scale 1,84"/pixel. One unfiltered frame bin 2x2 x 180 sec., show the source at 12.6 Mag. end figures for astrometry were AR. 20 20 54.36 s DEC. +25 08 16.2 position measured from reference stars UCAC-4 catalogue.



2017 09 15.478

Mag.= 13.9, position end figures 54s.35, 16".0 observed by T. Noguchi, Chiba-ken, Japan, using 0.23-m f/10 Schmidt Cassegrain + unfiltered CCD. An image at http://park8.wakwak.com/~ngc/images/dwarfnova_inVul.jpg.



2017 09 17.78860

This transient was observed on 2017 09 17.78860 by Adriano Valvasori, Catia Caselli, Pietro Vitello from Felsina Observatory using 0.40-m f/5 reflector - CCD KAF-1600 Scale 1,84"/pixel. Rc filter 5 frame bin 2x2 x 180 sec., show the source at 13.94 Mag., https://flic.kr/p/XxjGk1.



2017 09 25.424

Mag.= 16.6, position end figures 12s.21, 19".5 observed by T. Noguchi, Chiba-ken, Japan, using 0.23-m f/10 Schmidt Cassegrain + unfiltered CCD. An image at http://park8.wakwak.com/~ngc/images/PNVinM31_20170925.jpg.


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