Central Bureau for Astronomical Telegrams
IAUC 6987: 1998 ML_14; Sats OF NEPTUNE; EV Lac
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Circular No. 6987
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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1998 ML_14
M. Hicks and P. Weissman, Jet Propulsion Laboratory, write:
"We report BVRI photometry of 1998 ML_14 (MPEC 1998-M26, 1998-P17)
taken with the Las Campanas 2.54-m telescope of the Carnegie
Institution of Washington, over three nights (July 12-14 UT).
After subtraction of solar colors, we determined relative
magnitudes of B-R = +0.203 +/- 0.005, V-R = +0.088 +/- 0.004, I-R =
+0.084 +/- 0.004, consistent with S-type asteroids. Our R-band
photometry was best phased together into a double-peaked light
curve with an amplitude of 0.12 mag, a synodic period of 14.98 +/-
0.06 hr and a mean absolute Kron-Cousins R magnitude of 16.93 +/-
0.01, assuming a value for the slope parameter of G = 0.25."
SATELLITES OF NEPTUNE
C. Roddier, F. Roddier, J. E. Graves, O. Guyon, and M. J.
Northcott, Institute for Astronomy, University of Hawaii (UH),
report: "Infrared (1.72-micron) images of Neptune were taken on
July 6 with the UH adaptive optics system (Hokupa'a) mounted on the
Canada-France-Hawaii telescope. Neptune VIII (Proteus), VII
(Larissa), and VI (Galatea) were detected and observed from July
6.490 to 6.552 UT. Whereas Proteus and Larissa were found to be at
their expected position, Galatea was found to be 5 +/- 1 degrees
ahead of the predicted position (8.6 min early), a difference
possibly due to its interaction with Neptune's Adams ring (cf.
Ferrari and Brahic 1994, Icarus 111, 193; Hanninen and Porco 1997,
Icarus 126, 1)."
EV LACERTAE
F. Favata, Astrophysics Division, European Space Agency/ESTEC;
and S. Sciortino, G. Micela, and A. Maggio, Palermo Astronomical
Observatory, report: "We observed the dMe flare star EV Lac in
x-rays with the ASCA satellite during July 13.213-15.069 UT. An
unusually strong flaring event took place between July 13.833 and
13.948. A preliminary analysis of the ASCA data from the SIS and
GIS detectors shows that the event is of unprecedented intensity
for single-star flares, with the peak x-ray luminosity exceeding
the optical V-band luminosity by a factor of about 5 (i.e.,
reaching a value higher than the bolometric photospheric
luminosity). Observers who happened to be monitoring EV Lac at
any other wavelength (especially optical and radio) at the time of
the x-ray observation are invited to contact the above authors
(ffavata@astro.estec.esa.nl)."
(C) Copyright 1998 CBAT
1998 August 11 (6987) Daniel W. E. Green
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