Central Bureau for Astronomical Telegrams
IAUC 4932: 1989g1; 1989N
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Read IAUC 4933
Circular No. 4932
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
PERIODIC COMET RUSSELL 4 (1989g1)
J. Gibson, OAO Corporation and Jet Propulsion Laboratory,
reports his recovery of this comet with the Palomar 1.5-m
reflector (+ CCD + Gunn r filter), as indicated below. The
object is stellar within the limits of seeing.
1989 UT R.A. (1950) Decl. m2
Dec. 11.35311 7 31 03.33 +26 20 51.1 19
11.36774 7 31 02.93 +26 20 55.2
11.38325 7 31 02.53 +26 20 59.0
11.40928 7 31 01.81 +26 21 05.7
12.36030 7 30 37.44 +26 25 12.4
12.36612 7 30 37.28 +26 25 13.7
12.38179 7 30 36.84 +26 25 17.8
12.39352 7 30 36.54 +26 25 21.1
The above observations indicate that the prediction on
MPC 12136 (ephemeris on MPC 15430) requires a correction by
Delta(T) = -0.6 day. Improved orbital elements by B. G.
Marsden, Center for Astrophysics, from 49 observations,
1984-1989 (mean residual 1".2):
Epoch = 1990 July 8.0 ET
T = 1990 July 6.8305 ET Peri. = 92.9874
e = 0.366319 Node = 70.3963 1950.0
q = 2.222186 AU Incl. = 6.1896
a = 3.506791 AU n = 0.1500857 P = 6.567 years
SUPERNOVA 1989N IN NGC 3646
R. Lopez, University of Barcelona; and A. Riera and J. Cepa,
Instituto de Astrofisica de Canarias, communicate: "Low-resolution
spectra taken on Dec. 22 with the Faint Object Spectrograph (range
480-970 nm) on the 4.2-m William Herschel Telescope at the position
given by Mikolajczak (IAUC 4823) indicate that SN 1989N is a type-II
supernova, as inferred from the well-defined H-alpha (656.3 nm)
P-Cyg profile. From this feature, we estimate an expansion velocity
of 6700 km/s. Fe II (620 nm) and Ca II (857.9 nm) are also present."
1989 December 29 (4932) Daniel W. E. Green
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