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IAUC 6989: 1998dg; 1998dh; S/1997 U 2

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                                                 Circular No. 6989
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVA 1998dg IN MCG -3-34-008
     B. Schmidt, Mount Stromlo and Siding Spring Observatories,
reports that spectrophotometry (range 380-750 nm) obtained with the
Australian National University's 2.3-m telescope at Siding Spring
Observatory on Aug. 13.5 UT shows SN 1998dg (cf. IAUC 6978) to be a
type-Ia supernova, about 2 weeks past maximum light.  A redshift
was unavailable for the galaxy, but comparison of the supernova
spectrum with other type-Ia supernovae suggests that SN 1998dg is
at z about 0.01.


SUPERNOVA 1998dh IN NGC 7541
     O. Kuhn, F. Prada, and R. Costero, Instituto de Astronomia,
Universidad Nacional Autonoma de Mexico, report the following
near-infrared photometric magnitudes obtained on July 28.461 UT
with the 2.1-m telescope (+ CAMILA instrument) at the Observatorio
Astronomico Nacional at San Pedro Martir:  J =14.43 +/- 0.05, H =
14.35 +/- 0.05.
     CCD V magnitudes from D. Hanzl, Brno, Czech Republic, using a
0.40-m reflector (GSC comparison stars):  Aug. 5.933 UT, 14.0;
8.993, 14.0; 9.959, 13.95.


S/1997 U 2
     Extension to the ephemeris on IAUC 6869:

1998 TT   R. A. (2000) Decl.    Delta     r    Elong.  dR.A.  dDecl.
Aug. 25   20 51.37  -18 19.7   18.855   0.114  158.6    900+   297+
Sept. 4   20 50.01  -18 25.3   18.935   0.114  148.6    918+   288+
     14   20 48.83  -18 29.9   19.039   0.115  138.6    934+   279+
     24   20 47.91  -18 33.6   19.166   0.116  128.6    949+   269+
Oct.  4   20 47.27  -18 36.0   19.311   0.117  118.6    963+   260+
     14   20 46.95  -18 37.2   19.471   0.118  108.7    976+   252+
     24   20 46.97  -18 37.0   19.640   0.118   98.7    989+   244+
Nov.  3   20 47.33  -18 35.5   19.813   0.119   88.8   1001+   236+
     13   20 48.04  -18 32.6   19.986   0.120   79.0   1014+   229+
     23   20 49.07  -18 28.4   20.154   0.120   69.1   1026+   223+
Dec.  3   20 50.41  -18 23.0   20.311   0.121   59.3   1038+   218+
     13   20 52.03  -18 16.5   20.454   0.121   49.6   1051+   213+

                      (C) Copyright 1998 CBAT
1998 August 13                 (6989)            Daniel W. E. Green

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