Central Bureau for Astronomical Telegrams
IAUC 4632: 3C 279; 1988a; Corr
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Read IAUC 4633
Circular No. 4632
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-495-7244/7440/7444
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
3C 279
M. Urry, Space Telescope Science Institute, writes: "Ultraviolet
spectra of the flaring quasar 3C 279 were obtained with the
International Ultraviolet Explorer during July 5.17-5.58 UT, just
prior to Ginga x-ray observations (IAUC 4626, 4628). No lines were
apparent in the low-resolution IUE spectra and the continuum was
quite bright, with energy flux (3.3 +/- 0.4) x 10E-11 erg cm-2 s-1
between 123 and 300 nm with best-fit power-law energy index 1.6 +/- 0.2.
The extrapolated ultraviolet spectrum falls below the observed x-ray
spectrum reported by Makino et al. (IAUC 4626), and the x-ray spectral
index is considerably flatter, as might be expected for the Compton
component in an SSC model. Contemporaneous optical photometry
indicates that at the time of the ultraviolet and x-ray observations,
the quasar was relatively bright: J. Webb at the Rosemary Hill
Observatory reports the following photographic magnitudes: June 8,
14.7 +/- 0.4; 9, 14.5 +/- 0.1; 14, 14.3 +/- 0.1; 17, 14.7 +/- 0.2; July 8,
13.8 +/- 0.2; 10, 14.1 +/- 0.1; 17, 14.0 +/- 0.2; 19, 14.2 +/- 0.2.
Thus despite reported fading (IAUC 4630), 3C 279 was again flaring at
the beginning of July."
COMET LILLER (1988a)
Continuation of the ephemeris on IAUC 4602:
1988 ET R.A. (1950) Decl. Delta r m1
Aug. 7 12 38.50 +10 58.9 2.743 2.258 12.2
12 12 43.94 + 9 09.4
17 12 49.28 + 7 27.0 2.978 2.386 12.6
22 12 54.53 + 5 51.0
27 12 59.71 + 4 20.7 3.204 2.511 13.0
Sept. 1 13 04.81 + 2 55.4
6 13 09.85 + 1 34.6 3.418 2.635 13.4
11 13 14.83 + 0 17.9
16 13 19.76 - 0 55.2 3.617 2.757 13.7
CORRIGENDUM
On IAUC 4624, "Periodic Comet Tempel 2 (1987g)", lines 6-7,
for Jewitt and Luu's read Jewitt and Meech's
1988 July 21 (4632) Daniel W. E. Green
Read IAUC 4633
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