Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 7059: 1998es; C/1998 U5

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 7058 SEARCH Read IAUC 7060

View IAUC 7059 in .dvi or .ps format.
IAUC number 

                                                 Circular No. 7059
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 1998es IN NGC 632
     K. Ayani, Bisei Astronomical Observatory (BAO); and H.
Yamaoka, Kyushu University, report:  "A spectrum of SN 1998es (cf.
IAUC 7050, 7054) was obtained with BAO 1.01-m telescope on Nov.
19.6 UT.  Compared with the spectrum reported on IAUC 7054 (see
http://cfa-www.harvard.edu/cfa/oir/Research/supernova/spectra/sn98es.gif),
a Si II absorption feature around 612 nm (on the rest frame of the
host galaxy) has deepened but is still weaker than that of typical
type-Ia supernovae.  This spectral evolution is very similar to the
intrinsically bright type-Ia supernova 1991T, and our spectrum
shows that SN 1998es would be around maximum on the observed time.
Narrow Na I D absorption lines indicate that the recession velocity
of the host galaxy is about 3200 km/s, and that SN 1998es is
slightly reddened.  The expansion velocity derived from the shift
of Si II absorption minimum is about 11 000 km/s, which is smaller
than reported by Jha et al. (IAUC 7054).  Our spectrum is located at
ftp://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/SNe/sn1998es/sn98es550.gif."


COMET C/1998 U5 (LINEAR)
     Ephemeris extension to IAUC 7045 (elements MPC 32866):

1998 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Nov. 23    23 22.14   +51 53.5   0.507   1.313  119.4   40.9    7.7
     25    22 52.34   +47 44.8   0.544   1.303  113.5   44.0    7.8
     27    22 30.67   +43 50.4   0.586   1.294  108.0   46.5    8.0
     29    22 14.56   +40 19.4   0.633   1.285  102.9   48.4    8.1
Dec.  1    22 02.31   +37 13.3   0.683   1.278   98.2   49.8    8.2
      3    21 52.79   +34 31.0   0.736   1.270   94.0   50.7    8.4
      5    21 45.24   +32 09.7   0.790   1.264   90.1   51.2    8.5
      7    21 39.17   +30 06.7   0.846   1.258   86.4   51.4    8.6
      9    21 34.21   +28 19.2   0.902   1.253   83.1   51.3    8.8
     11    21 30.12   +26 45.0   0.959   1.249   79.9   50.9    8.9
     13    21 26.70   +25 22.1   1.016   1.245   77.0   50.4    9.0
     15    21 23.84   +24 08.9   1.073   1.242   74.2   49.7    9.1
     17    21 21.41   +23 03.8   1.129   1.240   71.5   48.8    9.2
     19    21 19.35   +22 05.8   1.185   1.239   68.9   47.8    9.3
     21    21 17.59   +21 14.0   1.241   1.238   66.5   46.8    9.4
     23    21 16.07   +20 27.4   1.296   1.238   64.1   45.6    9.5

     Visual m_1 and coma-diameter estimates (B = binoculars):  Nov.
16.01 UT, 7.6, 14' (J. Bortle, Stormville, NY, 10x50 B); 16.91,
8.1, 10' (K. Hornoch, Lelekovice, Czech Republic, 10x80 B); 18.72,
8.0, 7'.6 (W. Hasubick, Buchloe, Germany, 25x100 B); 20.16, 7.8,
15' (R. Keen, Mt. Thorodin, CO, 7x50 B); 23.92, 7.8, 5' (A.
Baransky, Kiev, Ukraine, 12x80 B).

                      (C) Copyright 1998 CBAT
1998 November 25               (7059)            Daniel W. E. Green

Read IAUC 7058 SEARCH Read IAUC 7060

View IAUC 7059 in .dvi or .ps format.

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

Valid HTML 4.01!