[Iaude] CBET 4597: 20190109 : (6478) GAULT
quai at eps.harvard.edu
quai at eps.harvard.edu
Wed Jan 9 14:19:51 EST 2019
Electronic Telegram No. 4597
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)
Prepared using the Tamkin Foundation Computer Network
Further to CBET 4594, A. Hale writes that he has posted two images at
website URL http://earthriseinstitute.org/gault.html. The upper image is an
image taken with the Canada-France-Hawaii telescope as provided by H. Weiland
to R. Berry. The lower image was the one taken by Hale on Jan. 8.0 UT.
Fifty 60-s unfiltered CCD exposures taken by A. Maury, J.-B. de Vanssay,
and J.-F. Soulier with a 0.4-m f/5 Ritchey-Chretien reflector at San Pedro de
Atacama, Chile, on Jan. 8.32 UT show a 15" tail and a tail about 4' long in
p.a. about 300 degrees; Soulier notes that the red magnitude of the object's
head was about 17.4 as measured in a photometric aperture of radius 6".7.
Soulier adds that he obtained seventy-five 60-s unfiltered exposures with a
0.20-m f/4 Newtonian reflector at Dauban, France, on Jan. 9.15-9.20 that show
a coma about 19" across and a tail about 3'.5 long in p.a. about 310 deg; the
red mag was 17.5-17.6 as measured in an aperture of radius 6".6.
T. Yusa, Osaki, Japan, reports that eight stacked 90-s CCD exposures
taken on Jan. 8.7 UT with an iTelescope 0.50-m f/6.8 astrograph at Siding
Spring, NSW, show the object's head to be completely stellar in appearance
and of mag 17.8 (luminance filter, compared to V-band magnitudes of stars in
the USNO-A2.0 catalogue) but with a straight 180" tail toward p.a. 292 deg;
Yusa has posted an image at the following website URL:
K. Kadota, Ageo, Japan, found a stellar head of mag 17.4 with a straight,
narrow tail 2'.7 long in p.a. 293 deg on CCD exposures taken on Jan. 8.7 UT
with a 0.25-m f/5 reflector.
M. Micheli writes that CCD images taken by P. Ruiz with a 1.0-m f/4.4
reflector at the European Space Agency's Optical Ground Station at Tenerife
on Jan. 9.1 UT (measured by Micheli, D. Koschny, A. Knoefel, M. Busch, and
E. Schwab) show a very thin tail 4' long at p.a. 291.5 degrees; the magnitude
of the object's head was measured as 17.6.
L. Buzzi, Varese, Italy, writes that stacked CCD images taken with a
0.84-m f/3.5 reflector in good transparency but mediocre seeing on Jan. 9.2
UT show a stellar head with a dust trail at least 135" long in p.a. 292 deg;
the magnitude was measured as 17.7.
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2019 CBAT
2019 January 9 (CBET 4597) Daniel W. E. Green
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