Central Bureau for Astronomical Telegrams

IAUC 5738: 1993J; 1993e

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).

---

Read IAUC 5737 Read IAUC 5739

View IAUC 5738 in .dvi or .ps format.

IAUC number

---

                                                  Circular No. 5738
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


SUPERNOVA 1993J IN NGC 3031
     W. Wamsteker, P. M. Rodriguez and R. Gonzalez, ESA IUE Observatory,
for the ESA IUE ToO team for Supernovae; G. Sonneborn, NASA Goddard
Space Flight Center; and R. Kirshner, Center for Astrophysics, report:
"Low-resolution IUE spectra (0.5 nm) covering 115-320 nm
show a strong ultraviolet continuum over the whole range, with a
sharp dropoff shortward of 127.5 nm.  A weak 220-nm feature suggests
total extinction of only E(B-V) = 0.07.  The short-wavelength fluxes
decreased by about 30-40 percent between Mar. 30.2 and 30.8 UT; no decrease
was evident in the fluxes longward of 240 nm.  Many interstellar absorption
lines are seen in the spectrum attributable to Si II + O I 130.0, C II
133.5, Si IV 140.0, C IV 155.0, Al II 167.1, Fe II + Mn II 260.0, Mg II
280.0 and Mg I 285.2 nm.  These features are considerably weaker than
seen in the similar spectra of SN 1980K with the same instrument.  The
flux F (in 5-nm bands) in units of 10**-14 erg s-1 cm-2 A-1 on Mar. 30.2
was F(127.5) = 126, F(173.5) = 115, F(245.0) = 75, F(290.0) = 68.  High-
resolution spectra (0.02 nm) show a complex structure of the numerous
interstellar lines.  The short-wavelength spectrum also shows the emission
features N V 123.88 and 124.28 nm redward of rest wavelength in the frame
of M81.  An LSR velocity of -100 km/s and M81 velocity of -40 km/s were
assumed.  N V 123.88 nm has an FWHM < 50 km/s; 124.28 nm has a red wing
extending > 200 km/s from line center.  Low-ionization interstellar
absorption lines such as Mg I 285.2 nm show a multi-component structure
at -117, -63, +12, +129 and +181 km/s (heliocentric); various weaker
components may also be present."


COMET SHOEMAKER-LEVY (1993e)
     The following prediscovery observations have been reported:

     1993 UT             R.A. (2000) Decl.        m1    Observer
     Mar. 17.75868   12 29 50.80   - 4 22 13.2   14.0   Otomo
          17.77153   12 29 50.21   - 4 22 12.4            "
          19.39514   12 29 03.41   - 4 17 43.0   12     Helin
          19.42014   12 29 02.78   - 4 17 36.3            "
          21.46788   12 28 03.61   - 4 11 50.7            "

S. Otomo (Otomo Observatory).  0.25-m f/3.4 reflector.
E. Helin, K. Lawrence and C. Brewer (Palomar).  0.46-m Schmidt.  Measurer
   Lawrence.  The Mar. 19 images were actually noted at the time.

     Corrigendum.  On IAUC 5725, the magnitude 16.7 should be an m2.


1993 April 1                   (5738)              Brian G. Marsden

---

Read IAUC 5737 Read IAUC 5739

View IAUC 5738 in .dvi or .ps format.

---

Our Web policy. Index to the CBAT/MPC/ICQ pages.