Central Bureau for Astronomical Telegrams
IAUC 6801: 1997ej; C/1997 J2
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Circular No. 6801
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 1997ej IN IC 2060
J. Maza, Department of Astronomy, University of Chile, reports
the discovery of a supernova (B about 16.5) by Marina Wischnjewsky
on a T-Max 400 film taken by L. Gonzalez using the Maksutov
telescope at Cerro El Roble Observatory on Dec. 29.145 UT. SN
1997ej is located at R.A. = 4h17m53s.49, Decl. = -56o36'58".2
(equinox 2000.0), which is 13".5 east and 17".5 south of the
nucleus of the lenticular galaxy IC 2060 (ESO 157-19). The object
is not visible on a IIa-O plate taken with the same telescope on
Nov. 25.21, nor is it visible on a T-Max film obtained on Nov.
27.22 (limiting mag about 19.5).
A. Clocchiatti, P. Universidad Catolica de Chile; and M. M.
Phillips, Cerro Tololo Interamerican Observatory (CTIO), write: "A
spectrogram (range 350-700 nm; resolution 0.6 nm) taken on Dec.
31.1 UT with the CTIO 1.5-m telescope shows that SN 1997ej is a
type-Ia supernova probably more than a week before maximum light.
The Si II 635.5-nm line is broad and strong, with a flat-bottomed,
blueshifted absorption, the centroid of which indicates an
expansion velocity of 15 000 km/s. The centroid of the Ca II H and
K absorption yields a blueshift of about 19 000 km/s. The spectrum
most resembles that of SN 1990N, about 2 weeks before maximum
(particularly in the broadness of the spectral features), but it
also compares reasonably well with a spectrum of SN 1992bc obtained
about 10 days before maximum. The high expansion velocities of the
Si II and Ca II lines in SN 1997ej are consistent with such an
early phase."
COMET C/1997 J2 (MEUNIER-DUPOUY)
Ephemeris extension to IAUC 6734 (elements MPC 30738):
1997/98 R. A. (2000) Decl. Delta r Elong. Phase m1
Dec. 28 19 12.86 +41 43.1 3.404 3.133 65.9 16.6 10.6
Jan. 7 19 35.60 +39 44.9 3.443 3.112 62.4 16.3 10.6
17 19 56.85 +37 59.8 3.487 3.094 58.8 15.8 10.6
27 20 16.68 +36 28.7 3.533 3.080 55.2 15.2 10.6
Feb. 6 20 35.13 +35 11.8 3.576 3.068 51.9 14.7 10.6
16 20 52.25 +34 08.4 3.613 3.059 49.1 14.1 10.6
26 21 08.08 +33 17.3 3.641 3.053 47.0 13.7 10.7
Mar. 8 21 22.65 +32 37.4 3.658 3.051 45.9 13.5 10.7
18 21 35.96 +32 06.7 3.660 3.052 45.9 13.5 10.7
28 21 48.02 +31 43.8 3.647 3.056 47.1 13.8 10.7
(C) Copyright 1997 CBAT
1997 December 31 (6801) Daniel W. E. Green
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