Central Bureau for Astronomical Telegrams
IAUC 6962: SGR 1621-47; C/1998 K5
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Circular No. 6962
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
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URL http://cfa-www.harvard.edu/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)
SGR 1621-47
S. Dieters and P. Woods, University of Alabama, Huntsville
(UAH); C. Kouveliotou, Universities Space Research Association; and
J. van Paradijs, UAH and University of Amsterdam, report: "We have
analyzed 9200 s of RXTE pointed observations made on June 26 of SGR
1627-41 (IAUC 6944), which were centered on the possibly-associated
supernova remnant G337.0-0.1 (cf. IAUC 6948, 6950). We detected
one burst, confirming flux detection from the new source and
strengthening the association of the two sources. Power spectral
analysis of the observations reveals a quasi-periodic oscillation
(QPO) peak centered at 0.15 Hz (about 6.7 s), with an r.m.s. of at
least 3.2 percent, depending upon background and source
contributions to the signal. Also within the RXTE field-of-view is
the black-hole candidate 4U 1630-47, from which QPOs have been
observed (IAUC 6823). However, no QPOs near the above frequency
have been reported, and the intensity of 1630-47 was low during our
observations. Further observations are required to determine which
source is the origin of the QPO."
COMET C/1998 K5 (LINEAR)
D. H. Wooden, Ames Research Center, NASA; D. E. Harker and C.
E. Woodward, University of Wyoming; and W. L. Raas, SETI Institute
and University of California at Los Angeles, report 10-micron
spectrophotometry (3" aperture, resolution about 220) of comet
C/1998 K5, obtained with the Wyoming Infrared Observatory's 2.34-m
telescope (+ NASA/Ames HIFOGS) during the period June 28-30 UT. No
silicate feature (9.0-11.6 microns) was detected in excess of the
continuum, well-fitted by a blackbody with a color temperature 310
+/- 10 K and a continuum flux density at 7.8 microns of 7.2 +/- 0.4
x 10E-18 W cmE-2 micronE-1. The peak flux density measured at 10
microns was 7.5 +/- 1.0 x 10E-18 W cmE-2 micronE-1.
Ephemeris extension to IAUC 6940 (elements MPEC 1998-M30):
1998 TT R. A. (2000) Decl. Delta r Elong. Phase m1
July 6 0 38.97 +51 53.6 0.247 0.984 75.4 90.5 12.9
11 1 26.16 +49 00.4 0.280 0.970 72.5 91.5 13.1
16 1 59.99 +46 01.4 0.316 0.964 71.5 90.4 13.3
21 2 25.24 +43 16.6 0.352 0.966 71.7 88.0 13.6
26 2 44.89 +40 49.9 0.388 0.975 72.9 84.7 13.8
31 3 00.68 +38 40.2 0.424 0.992 74.8 80.9 14.1
Aug. 5 3 13.63 +36 44.8 0.458 1.016 77.1 76.8 14.4
(C) Copyright 1998 CBAT
1998 July 2 (6962) Daniel W. E. Green
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