Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

PNV J17180658-3204279

PNV J17180658-3204279   2018 01 17.8691*  17 18 06.58 -32 04 27.9  11.0 U             Sco       9 0

2018 01 17.869

Discovered by H. Nishimura, Kakegawa, Shizuoka-ken, Japan, with on 10-s exposure on three frames using Canon EOS 6D digital camera + f/3.2 200-mm lens under the limiting mag = 12s, who writes that nothing is visible at this location on a frame taken on 2018 Jan. 15.872 UT.

2018 01 18.33

Three Gaia DR1 sources (of G magnitude 18–19) are located within 6" from the reported position. --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2018 01 18.4701

Object appears in 4 DSLR images taken by Rob Kaufman, Bright, Victoria, Australia. Magnitude 11.0 (V). Object appears reddish under high colour saturation. No additional astrometry. Image here: https://tinyurl.com/y7mg2xg8

2018 01 18.7201

Corrected time for previous follow-up - Rob Kaufman

2018 01 18.2473

Robert Fidrich, Hungary can confirm PNV J17180658-3204279 is clearly visible on 30s CCD V images taken with 0.51m Telescope at iTelescope siding Spring Station on 18.2473 January 2018. The image can be downloaded here: https://www.dropbox.com/s/ymgc3h1g4pzs6ut/nsco18fid_crop_x.jpg?dl=0

2018 01 18.2473

Astrometry made by Robert Fidrich, Hungary provides the following position for PNV J17180658-3204279: RA: 17h 18m 06.37s D: -32° 04' 27.7"

2018 01 18.2473

The brightness of PNV J17180658-3204279 on 2018 01 18.2473UT was 10.722V (0.042) - ensemble photometry of 2x30s CCD images made by Robert Fidrich, Hungary using the 0.51m T31 telescope of iTelescope network at Siding Spring, Australia. The photometry was calibrated using APASS V data usin UCAC4 catalogue.

2018 01 18.2473

The brightness of PNV J17180658-3204279 on 2018 01 18.2473UT was 10.722V (0.042) - ensemble photometry of 2x30s CCD images made by Robert Fidrich, Hungary using the 0.51m T31 telescope of iTelescope network at Siding Spring, Australia. The photometry was calibrated using APASS V data usin UCAC4 catalogue.

2018 01 18.85

The closest Gaia DR1 source to the position provided by Róbert Fidrich is 2.9" away (position end figures 06.24s, 25.4"; G= 18.07 mag). The VISTA variable VVV J171806.41-320427.16 (position end figures 06.41s, 27.2"; 18 mag) is only 0.8" away. --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2018 01 18.7479

Corrected time for previous follow-up - Robert Fidrich

2018 01 19.7564

Multi color photometry results were B=12.42, V=11.12, Rc=10.06 and Ic=9.25 with T17, iTelescope.NET (0.43-m f/6.8 CDK astrograph + FLI PL4710 CCD) at SSO, NSW, Australia. I also done low-resolution spectroscopy but no significant feature detected. Seiichiro Kiyota (Kamagaya, Japan)