Electronic Telegram No. 4313
Central Bureau for Astronomical Telegrams
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Prepared using the Tamkin Foundation Computer Network


COMET 174P/ECHECLUS = (60558) ECHECLUS
     R. Miles, Stourton Caundle, U.K. reports that CCD images taken by P.
Camilleri using a 0.30-m f/5.4 Schmidt-Cassegrain reflector at the Blue
Mountains Observatory at Leura, NSW, Australia, and analysed by himself show
174P/Echeclus brightening from magnitude r' = 17.8 to 15.2 between Aug.
27.745 and 28.686 UT in a photometric aperture of radius 5".2.  Images
scheduled by Miles using the 0.4-m Las Cumbres Global Telescope Network
(LCOGT) at Tenerife, Spain; 1.0-m reflector at Sutherland, South Africa;
and 1.0-m reflector at Cerro Tololo, Chile, confirm the outburst and show no
additional brightening during a further interval of 0.6 day.  All images
show the object to be essentially stellar in 1".8 (FWHM) seeing.  Miles
also measured a value of B-V = +1.04 +/- 0.03 for the color index of the
coma in LCOGT images scheduled by A. Watkins, which he suggests is slightly
reddened with respect to solar in color.
     P. Birtwhistle, Great Shefford, Berkshire, England, writes that
follow-up CCD images taken with a 0.40-m f/6.0 Schmidt-Cassegrain reflector
on Aug. 30.1 UT show a circular coma of diameter 14" but with a center of
light offset to the south by 1"-2", adding that the FWHM of 174P is 50
percent larger than nearby stars of similar magnitude; he measures mag
15.1-15.2 in a photometric aperture of radius 7".5.
     J. J. Gonzalez reports that he found 174P at visual magnitude 14.8
on Aug. 30.09 UT with a 0.20-m reflector at Leon, Spain.


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                         (C) Copyright 2016 CBAT
2016 September 1                 (CBET 4313)              Daniel W. E. Green