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IAUC 6990: 1998dj; C/1998 J1

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                                                 Circular No. 6990
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 1998dj in NGC 788
     A. Piemonte, Pontificia Universidad Catolica; and F. Patat,
European Southern Observatory (ESO), report that they obtained a
CCD spectrogram (30-min exposure, range 320-1010 nm, resolution 1.5
nm) of SN 1998dj (cf. IAUC 6986) with the ESO 1.5-m telescope (+
Boller & Chivens spectrograph) on Aug. 12.38 UT at La Silla.
Inspection of the fully-reduced spectrum shows that this supernova
is of type Ia, between 15 and 20 days after maximum; the Si II
absorption feature is still present, together with the Ca II
infrared triplet (plus H and K lines) and some Fe II features.  The
expansion velocities, derived from the above lines, range from 9000
to 12 000 km/s, consistent with the deduced phase.


COMET C/1998 J1 (SOHO)
     Ephemeris extension to IAUC 6960 (elements MPC 32168):

1998 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Aug. 15    10 37.80   -53 14.5   2.358   2.202   68.6   25.4   12.3
     20    10 50.85   -54 21.5   2.458   2.280   67.9   24.3   12.5
     25    11 03.78   -55 26.2   2.558   2.357   67.1   23.3   12.8
     30    11 16.62   -56 29.0   2.658   2.433   66.2   22.3   13.0
Sept. 4    11 29.39   -57 30.0   2.756   2.508   65.3   21.4   13.2
      9    11 42.13   -58 29.5   2.854   2.582   64.3   20.6   13.4
     14    11 54.86   -59 27.5   2.951   2.655   63.3   19.8   13.6
     19    12 07.61   -60 24.2   3.047   2.727   62.2   19.0   13.8
     24    12 20.41   -61 19.8   3.141   2.798   61.1   18.3   14.0
     29    12 33.26   -62 14.3   3.234   2.868   60.0   17.6   14.1
Oct.  4    12 46.21   -63 07.7   3.326   2.938   59.0   17.0   14.3
      9    12 59.26   -64 00.0   3.416   3.007   57.9   16.3   14.4
     14    13 12.46   -64 51.3   3.504   3.075   56.9   15.8   14.6
     19    13 25.82   -65 41.4   3.591   3.142   55.9   15.2   14.7
     24    13 39.36   -66 30.6   3.675   3.208   54.9   14.7   14.9
     29    13 53.10   -67 18.6   3.757   3.274   54.1   14.2   15.0
Nov.  3    14 07.05   -68 05.5   3.836   3.340   53.3   13.8   15.2
      8    14 21.26   -68 51.2   3.914   3.404   52.6   13.4   15.3
     13    14 35.73   -69 35.7   3.988   3.469   52.0   13.0   15.4

                      (C) Copyright 1998 CBAT
1998 August 17                 (6990)            Daniel W. E. Green

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