Circular No. 6753

Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION

Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.

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COMET C/1997 T1 (UTSUNOMIYA)

Preliminary parabolic orbital elements by S. Nakano, Sumoto, Japan, from 46 observations (Oct. 5–6).

T = 1997 Dec. 10.836 TT  ω = 96.^{o}950
Ω = 53.942 }2000.0
q = 1.34933 AU  i = 128.182
1997TT α_{2000}  δ_{2000}  Δ  r  ϵ  β  m_{1}
Oct. 4 23^{h}16.^{m}2 +72^{o}36.^{′}5 1.033 1.670 110.^{o}5 34.^{o}1 10.3
5 22 52.2 +72 14.2 1.026 1.662 110.3 34.4 10.3
6 22 29.2 +71 40.3 1.019 1.654 110.0 34.6 10.2
7 22 07.5 +70 55.6 1.014 1.646 109.6 34.9 10.2
8 21 47.5 +70 01.1 1.011 1.638 109.2 35.2 10.2
9 21 29.33 +68 58.2 1.008 1.630 108.6 35.5 10.1
10 21 12.89 +67 47.9 1.006 1.622 108.0 35.8 10.1
11 20 58.17 +66 31.6 1.006 1.614 107.3 36.2 10.1
12 20 45.02 +65 10.4 1.006 1.607 106.6 36.5 10.1
13 20 33.32 +63 45.3 1.008 1.599 105.7 36.9 10.1
14 20 22.90 +62 17.2 1.011 1.591 104.8 37.3 10.0
15 20 13.62 +60 46.9 1.015 1.584 103.9 37.7 10.0
16 20 05.35 +59 15.2 1.019 1.577 102.9 38.1 10.0
17 19 57.96 +57 42.7 1.025 1.569 101.8 38.4 10.0
18 19 51.34 +56 09.9 1.032 1.562 100.7 38.8 10.0
19 19 45.41 +54 37.2 1.040 1.555  99.6 39.2 10.0
20 19 40.07 +53 05.0 1.049 1.548  98.4 39.5 10.0
21 19 35.27 +51 33.7 1.058 1.541  97.2 39.9 10.0
22 19 30.92 +50 03.6 1.069 1.534  95.9 40.2 10.0
23 19 26.99 +48 34.8 1.080 1.527  94.7 40.5 10.0
24 19 23.43 +47 07.7 1.092 1.521  93.4 40.8 10.0

SUPERNOVA 1997dg IN ANONYMOUS GALAXY L. Wang, C. Pulliam, and J. C. Wheeler, University of Texas, report:

“A spectrum of SN 1997dg was obtained on Oct. 1.3 UT at the 2.7-m telescope (+ LCS) of the McDonald Observatory. We confirm that this is a type-Ia supernova a few days past maximum (cf. IAUC 6749). The redshift of the host galaxy is ∼ 0.034, assuming a Ca II (H and K) expansion velocity for the ejecta of 12 000 km/s.”

1997 October 6  \begin{matrix}c \\ ◯ \end{matrix} Copyright 1997 CBAT  Daniel W. E. Green