[Iaude] CBET 4488: 20180212 : NOVA SCORPII 2018 No. 2 = PNV J16484962-4457032

quai at eps.harvard.edu quai at eps.harvard.edu
Mon Feb 12 14:33:51 EST 2018


                                                  Electronic Telegram No. 4488
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau at eps.harvard.edu (alternate cbat at iau.org)
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Prepared using the Tamkin Foundation Computer Network


NOVA SCORPII 2018 No. 2 = PNV J16484962-4457032
     S. Nakano, Sumoto, Japan, reports the discovery of an apparent nova
(mag 11.7) on five unfiltered CCD frames (limiting mag 14.0) taken by Hideo
Nishimura (Kakegawa, Shizuoka-ken, Japan) using a Canon EOS 6D digital camera
(+ 200-mm-f.l. f/3.2 lens) on Feb. 6.863 UT.  The position was measured to be
R.A. = 16h48m49s.62, Decl. = -44d57'03".2 (equinox J2000.0); Nishimura notes
that nothing is visible at this position on three frames taken on Feb. 3.855,
4.863 and 5.864 (limiting mag 13); there is a nearby star of mag 16.8 with
position end figures 49s.24, 01".8.  The variable was given the provisional
designation PNV J16484962-4457032 when it was posted at the Central Bureau's
TOCP webpage.
     Additional CCD magnitudes reported for PNV J16484962-4457032:  Feb.
7.716 UT, B = 11.1, V = 10.1, R = 9.7 (observer given as Kaneo of
Shizuoka-ken, Japan, remotely using a 0.51-m f/4.4 telescope at Siding
Spring; position end figures 49s.64, 03".1; communicated by Nakano); 7.735,
B = 12.21, V = 10.10, R_c = 8.88, I_c = 7.63 (S. Kiyota, Kamagaya, Japan;
iTelescope with 0.50-m f/4.5 CDK astrograph at Siding Spring Observatory,
NSW, Australia; position end figures 49s.67, 03".2; image posted at website
URL http://meineko.sakura.ne.jp/ccd/PNV_J16484962-4457032.jpg); 11.73, B =
12.12, V = 10.02, I = 7.03 (S. O'Connor, St. George, Bermuda; forwarded by
E. O. Waagen, AAVSO).
     A. Pearce, Nedlands, W. Australia, provides the following astrometry for
PNV J16484962-4457032, taken with an iTelescope 0.43-m f/6.8 reflector at
Siding Spring:  RA = 16h48m49s.63, Decl. = -44d57'03".0 (equinox J2000.0).
Pearce also relates the following visual magnitude estimates for the variable:
Feb. 7.830 UT, 10.5; 8.776, 10.1; 9.821, 9.8; 10.854, 10.1; 11.817, 10.3.
     P. Schmeer, Saarbruecken-Bischmisheim, Germany, writes that a VISTA
variable (VVV catalog DR2) is located about 0".7 away from the positions
reported by Kaneo and Kiyota (VVV J164849.63-445702.43 = VPHASDR2
J164849.6-445702.3; position end figures 49.63s, 02.4").
     Kiyota adds that a low-resolution spectrogram taken on Feb. 7.7 UT shows
PNV J16484962-4457032 to be highly reddened; his spectrogram is posted at URL
http://meineko.sakura.ne.jp/ccd/PNV_J16484962-4457032-spectrum.jpg.  An
additional spectrogram taken by Kiyota on Feb. 11.76 with an iTelescope 0.43-m
f/6.8 reflector at Siding Spring shows Balmer and other emission lines; see URL
http://meineko.sakura.ne.jp/ccd/PNV_J16484962-4457032-spectrum-20180211.jpg.
     A report by J. Strader et al. suggests that PNV J16484962-4457032 is a
classical "Fe II"-type nova from a spectrogram (range 380-780 nm) obtained
on Feb. 12.39 UT with the 4.1-m Southern Astrophysical Research Telescope
at Cerro Pachon, Chile; the broad Balmer-line emission indicated full-width-
at-half-maximum of about 3000 km/s for H_alpha and about 1850 km/s for H_beta
(more details are given at URL http://www.astronomerstelegram.org/?read=11289).


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2018 CBAT
2018 February 12                 (CBET 4488)              Daniel W. E. Green



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