IAUC 9285: V1657 Sco = N Sco 2017 = PNV J16521887-3754189; 2P

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                                                  Circular No. 9285
Central Bureau for Astronomical Telegrams
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Prepared using the Tamkin Foundation Computer Network


V1657 SCORPII = NOVA SCORPII 2017 = PNV J16521887-3754189
     S. Nakano, Sumoto, Japan, reports the discovery of an apparent
nova (mag 11.7) by H. Nishimura (Kakegawa, Shizuoka-ken, Japan) on
three unfiltered 10-s frames using a Canon digital camera (+
200-mm f/3.2 lens) on Feb. 1.862 UT, its position given as R.A. =
16h52m18s.87, Decl. = -37o54'18".9 (equinox J2000.0).  The variable
was designated PNV J16521887-3754189 when it was posted at the
Central Bureau's TOCP webpage.  Additional CCD magnitudes for the
variable:  Jan. 30.868, 12.5 (Nishimura); Feb. 2.857, 12.1
(Nishimura); 6.836, 12.7 (Nishimura); 10.702, B = 14.7, V = 14.1,
R_c = 11.8, I_c = 12.5 (S. Kiyota, Kamagaya, Japan; remotely with a
0.50-m astrograph at Siding Spring; position end figures 18s.63,
16".4); 10.835, 12.6 (T. Noguchi, Chiba-ken, Japan, 0.23-m
reflector; position end figures 18s.66, 16".7; communicated by
Nakano); 23.718, R = 11.7 (S. Foglia and colleagues, using a 0.15-m
refractor at Siding Spring; position end figures 18s.65, 16".3).
Noguchi reports that a star of mag 15.9 is present at the position
of PNV J16521887-3754189 on a Digitized Sky Survey image from 1995.
P. Schmeer, Bischmisheim, Germany, writes that the red star noted
by Noguchi has blue magnitude 18.5 and red magnitude 15.0-15.9 in
the USNO-B1.0 catalogue, and V = 17.0 in the GSC2.3 catalogue.
Further details are given on CBET 4364.
     Optical spectroscopy (range 480-880 nm; resolution 0.56 nm)
obtained on Feb. 12.3 UT by J. Strader, L. Chomiuk, A. Bahramian,
and C. Britt, Michigan State University, with the 4.1-m SOAR
telescope (+ Goodman Spectrograph) at Cerro Pachon shows a spectrum
for PNV J16521887-3754189 that indicates a classification as an
"He/N"-type nova.  Details are given on CBET 4364.
     N. Samus and E. Kazarovets note that this variable has been
given the permanent GCVS designation V1657 Sco.


COMET 2P/ENCKE
     Numerous observers have noticed prominent plasma and dust
tails in recent weeks in images of comet 2P.  Images taken by M.
Jaeger (Vienna, Austria) suggest that the anti-tail has been
especially prominent in the past month, fading somewhat since late
January.  Visual total-magnitude and coma-diameter estimates:
2016 Dec. 26.82 UT, 11.5, 4' (J. J. Gonzalez, Leon, Spain, 0.20-m
reflector); 31.72, 13.8, 2'.0 (W. Hasubick, Buchloe, Germany, 44-cm
reflector); 2017 Jan. 19.79, 11.1, 4' (Gonzalez); 24.39, 12.2, 1'.7
(S. Yoshida, Ibaraki, Japan, 0.40-m reflector); 28.75, 12.8, 1'.1
(Hasubick); Feb. 16.77, 9.2, 2'.1 (Hasubick); 16.82, 9.2, 3'
(Gonzalez, 25x100 binoculars); 18.43, 9.0, 4' (K. Yoshimoto,
Yamaguchi, Japan, 26x100 binoculars).

                      (C) Copyright 2017 CBAT
2017 February 24               (9285)            Daniel W. E. Green

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