Central Bureau for Astronomical Telegrams
IAUC 9281: 252P; V5850 Sgr = N Sgr 2015 No. 4 = PNV J18225925-1914148
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Circular No. 9281
Central Bureau for Astronomical Telegrams
New postal address: Hoffman Lab 209; Harvard University;
20 Oxford St.; Cambridge, MA 02138; U.S.A.
CBATIAU@EPS.HARVARD.EDU ISSN 0081-0304
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network
COMET 252P/LINEAR
I. Coulson, East Asian Observatory, Hilo; Y.-J. Kuan, W. Ip,
Z.-Y. Lin, W.-L. Tseng, and Y.-L. Chuang, National Taiwan Normal
University; and S. Milam, S. Charnley, and M. Cordiner, Goddard
Space Flight Center, NASA, write that they obtained a 40-min-
duration, 900"-wide, 850-micron image of comet 252P with the
SCUBA-2 continuum camera on the James Clerk Maxwell Telescope
(JCMT) on Mar. 25.66 UT, when the comet was at distances r = 1.007
and Decl. = 0.0435 AU. The comet's image is centrally condensed
and slightly larger than the FWHM of the JCMT beam of 15", which
corresponds to 475 km at the comet. The integrated brightness is
158 +/- 28 mJy, implying a mass of about 1-mm-sized dust particles
of 1.2 x 10**8 kg. The simultaneous 450-micron brightness is less
than 930 mJy (3-sigma). Observations with the HARP array receiver
on Mar. 27 and 28 show J=4-3 HCN emissions to have peak values of
T***_a about 1 K, FWHMs of 1 km/s, and with variable profile and
strength. Integrated flux maps show the comet is again slightly
larger than the JCMT beam. Deduced production rates of HCN and
water are typically 3.3 x 10**25 and 1.7 x 10**28 molecules/s.
V5850 Sgr = NOVA Sgr 2015 No. 4 = PNV J18225925-1914148
As first announced on CBET 4163, S. Fujikawa (Kan'onji,
Kagawa, Japan) found a variable star (mag 11.8) on a 60-s CCD frame
taken on 2015 Oct. 31.386 UT using a 120-mm-f.l. camera lens; the
position of the variable was given as R.A. = 18h22m59s.33, Decl. =
-19o14'06".8 (equinox 2000.0). A 30-s exposure by Fujikawa taken
with a 400-mm-f.l. lens on Oct. 31.406 yeilded mag 11.7 and
position end figures 59s.29, 12".3. An independent discovery of
this nova-like object at mag 11.5 was made by H. Nishimura
(Kakegawa, Shizuoka-ken, Japan) from four 30-s CCD frames taken on
Oct. 31.376 using a 200-mm.-f.l. camera lens, the position end
figures given as 59s.25, 14".8 (and when S. Nakano posted this to
the Bureau's TOCP webpage, it was assigned the designation PNV
J18225925-1914148). At the same time, Nakano added that M.
Yamamoto (Okazaki, Aichi-ken, Japan) reported his independent
discovery of this object at mag 11.0 on three CCD frames taken on
Oct. 31.392 using a 135-mm-f.l. f/3.5 lens, providing position end
figures 59s.10, 15" (uncertainty +/- 5"). Spectroscopy by M. Fujii
(Kurashiki, Okayama, Japan) on Nov. 2.417 and 3.389 with a 0.4-m
telescope and by U. Munari on Nov. 3.72 with the Asiago 1.22-m
telescope showed strong emission lines of hydrogen Balmer, He I,
and N II, suggesting a ''He/N"-type nova. Additional details are
given on CBET 4163.
E. Kazarovets and N. Samus note that the permanent GCVS
designation V5850 Sgr has been assigned to this variable.
(C) Copyright 2016 CBAT
2016 April 6 (9281) Daniel W. E. Green
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