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IAUC 5575: 1992as; N Sco 1992; PSR 0950+08

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IAUC number

                                                  Circular No. 5575
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505

     J. Maza, University of Chile; and L. Wells, Cerro Tololo
Interamerican Observatory, report the discovery by L. Gonzalez
(CTIO), on a 20-min unfiltered IIa-O plate taken by M. Wischnjewsky
(University of Chile) and C. Muena (CTIO) with the CTIO Curtis
Schmidt telescope on Aug. 1.146 UT, of a supernova (mpg about 18.5)
located 2".7 west and 4".3 south of the nucleus of a galaxy at R.A.
= 21h00m36s, Decl. = -44 50'.8 (equinox 1950.0).  Confirmation was
made by E. Rubenstein (Yale University) from B and V CCD images
obtained on Aug. 4.236 with the CTIO 0.9-m telescope.  Spectrograms
were obtained on Aug. 4.178 at the CTIO 1.5-m telescope by S. Zepf
(University of Durham), and on Aug. 4.276 at the CTIO 4-m telescope
by L. Lu (University of Wisconsin), showing that this object looks
very much like the type-II supernova 1986L about 3 weeks past maximum.
Given this identification, the redshift of the parent galaxy
is about 0.025.

     This nova again appears to be going through another brightening
phase.  Photoelectric observations from B. Allen (cf. IAUC
5558, etc.):  July 16.33 UT, V = 8.26, B-V = +1.00, U-B = -0.16;
17.45, 8.57, +0.97, -0.13; 23.35, 9.47, +1.03, -0.28; 26.37, 9.46,
+0.99, -0.22; 27.34, 9.31, +1.01, -0.25; 28.46, 9.39, +0.91, -0.21;
Aug. 1.38, 8.42, +1.11, +0.11; 3.33, 7.91, +1.08, +0.18.  Further
unfiltered CCD magnitudes from W. Liller (cf. IAUC 5564):  July
15.00 UT, 7.94; 21.00, 8.49; 24.95, 8.46; 26.01, 8.55; 27.05, 8.54;
28.02, 8.39; 31.01, 8.20; Aug. 1.00, 7.68; 2.97, 7.18.

PSR 0950+08
     P. Janardhan, Radio Astronomy Division, Physical Research
Laboratory, Ahmedabad, reports for M. R. Deshpande, Hari Om Vats, A.
D. Bobra, P. Venat, N. S. Nirman, K. S. Lali, and himself:  "On
July 29.35 UT, the pulsar 0950+08 showed enhanced scintillating
flux at 103 MHz, for the first time in many years, along with large
amplitude pulses roughly 8-10 times the normal observed levels.
The observations were carried out with two similar Interplanetary
Scintillation (IPS) telescopes separated by 200 km, thereby ruling
out ionospheric scintillation and local intereference.  Other
sources in the vicinity showed normal levels of scintillation prior
to and after the day of the observation."

1992 August 4                  (5575)            Daniel W. E. Green

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