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TCP J18001854-3533149: new transient (12.2 mag) in Sagittarius

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SPK
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TCP J18001854-3533149: new transient (12.2 mag) in Sagittarius

TCP J18001854-3533149

Discoverers: Koichi Nishiyama (Kurume, Japan) and Fujio Kabashima (Miyaki, Japan)

R.A. 18h00m18.54s  Decl. -35°33'14.9"  (J2000.0)
2016 March 16.8449 UT, 12.2 mag (CCD, unfiltered)

"2016 03 16.8449 UT
Koichi Nishiyama, Kurume, Japan and Fujio Kabashima, Miyaki, Japan report a discovery of TCP object (mag.= 12.2) in Sgr on two 40-s unfiltered CCD frames taken around 2016 Mar. 16.84493 UT (limiting magnitude = 13.5), using a 135-mm f/4 camera lens (+FLI 09000 camera).
We have confirmed immediately the appearance of our discovery this TCP object on five 3-s unfiltered CCD frames taken around 2016 Mar 16.85167 UT (limiting magnitude = 17.3), 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 2016 Mar 02.858 UT (limiting mag.= 12.7) and 14.844 UT (limiting mag.= 13.2) nor on DSS, USNO-B1.0. We have checked in Minor Planets. Nearest star in USNO B1.0 has position end figures 18s322, 14"97, distance 2"7, magnitudes R1=16.12 I=15.95."

The variable star ASAS J180018-3533.5 (I= 12.019 mag, amplitude 0.610 mag) is 16" from TCP J18001854-3533149.

Clear skies,
Patrick

SPK
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TCP J18001854-3533149: UGWZ at supermaximum?

This transient has the large outburst amplitude and the blue colour of a WZ Sge-type dwarf nova outburst.

Time-resolved photometry and spectroscopy are urgently required.

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