IAUC 9286: V5856 Sgr = PNV J18205200-2822100; C/2017 E2; C/2017 E4

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                                                  Circular No. 9286
Central Bureau for Astronomical Telegrams
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V5856 SAGITTARII = PNV J18205200-2822100
     As first announced on CBET 4334, S. Nakano reported the
discovery of an apparent nova (mag 10.4) by Yukio Sakurai (Mito,
Ibaraki-ken, Japan) on two 10-s digital exposures taken on 2016
Oct. 26.38 UT with a 180-mm-focal-length f/2.8 camera lens (+
Nikon D7100 camera); Sakurai measured the following position for
the variable:  R.A. = 18h20m52s.0, Decl. = -28o22'10" (equinox
2000.0).  He adds that nothing is visible at this position on two
frames taken on Oct. 23.398 using the same instrumentation.  The
variable was designated PNV J18205200-2822100 when it was posted at
the Central Bureau's TOCP webpage.  Nakano measured Sakurai's jpeg
image and found mag 10.7 and position end figures 52s.42, 11".2
(+/- 2"), adding that the limiting magnitude seems to be 12.5.  P.
Schmeer, Bischmisheim, Germany, noted that an independent discovery
of PNV J18205200-2822100 was made by K. Z. Stanek et al. in the
course of the All-Sky Automated Survey for Supernova (ASAS-SN)
using the robotic 14-cm "Cassius" telescope at Cerro Tololo, in
which the variable appeared at magnitude V about 13.7 on Oct. 25.02
(with position end figures 52s.12, 13".5); additional ASAS-SN
magnitudes for PNV J18205200-2822100:  Oct. 20.04, [17.3; 26.02,
11.6.
     P. Luckas, University of Western Australia, obtained low-
resolution CCD spectroscopy (range 380-720 nm) of PNV
J18205200-2822100 on 2016 Oct. 27.5 UT with a 35-cm reflector at
Shenton Park Observatory, Perth.  The spectrum suggests an
optically thick stage of nova expansion; the Balmer series were
seen in emission through H_delta with little evidence for any P-Cyg
absorption, with a low maximum radial velocity (HWZI) of -750 +/-
50 km/s at H_alpha and H_beta.  There is, however, a broader weak
extended wing at H_alpha (at about 5 percent of the continuum and
only a few percent of the peak intensity) that extends to nearly
1050 km/s.
     Further details are given on CBET 4334.  N. Samus and E.
Kazarovets note that this variable has been given the permanent
GCVS designation V5856 Sgr.  This is presumably also Nova Sgr 2016
No. 4 (cf. IAUC 9284).


COMET C/2017 E2 (TSUCHINSHAN)
     The IAU Working Group on Small Body Nomenclature has voted to
change the name of this comet (cf. CBET 4370) from "XuYi" to
"Tsuchinshan", following the pattern established with comets
62P/1965 A1 and 60P/1965 A2 (cf. IAUC 1892).


COMET C/2017 E4 (LOVEJOY)
     Visual total-magnitude estimates by J. J. Gonzalez, Leon,
Spain, with 10x50 binoculars:  Mar. 28.18 UT, 7.9; Apr. 1.17, 7.4;
7.17, 7.1.

                      (C) Copyright 2017 CBAT
2017 April 17                  (9286)            Daniel W. E. Green

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