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IAUC 3983: WATER MASER IN NGC 3079; SN IN NGC 991; 1984g

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IAUC number 

                                                  Circular No. 3983
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444


WATER MASER IN NGC 3079
     C. Henkel, R. Guesten, C. Thum, and D. Downes communicate the
discovery with the Effelsberg 100-m telescope of the most luminous
H2O maser yet found, in the galaxy NGC 3079.  The maser is located
at R.A. = 9h58m35s0, Decl. = +55deg55'17"6 (+/-5 arcsec, equinox 1950.0),
and has a peak flux density of 11 Jy and H2O features over a velocity
range of at least 140 km/s, centered on vlsr = 960 km/s.   For
isotropic emission and a source distance of 15 Mpc, the total
luminosity in the 22-GHz H2O line is 600 Lo.  The galaxy is also one of
the strongest emitters in the IRAS survey.


SUPERNOVA IN NGC 991
     R. Buta, Mount Stromlo Observatory, telexes that a spectrum of
the supernova in NGC 991 obtained by J. Lewis with the 1.9-m telescope
indicates that this is probably a type II supernova about one
month past maximum light, rather than type I as indicated by Buta
on IAUC 3981 (he notes that colors of supernovae are fairly ambiguous
at phases well past maximum).  The spectrum was in the range
500-540 nm and shows features similar to those observed in the
supernova 1979c on 1979 May 28 (Branch et al. 1981, Ap.J. 244, 780).


PERIODIC COMET WOLF-HARRINGTON (1984g)
     Total visual magnitude estimate by C. S. Morris (near Mt.
Wilson, CA, 0.25-m reflector): Aug. 28.50 UT, 12.8.  Ephemeris from
the elements on MPC 8289, T corrected to Sept. 22.759 ET:

     1984 ET     R.A. (1950.0) Decl.      p        r       m2

     Aug. 28     6 33.13    +25 26.2    1.951    1.636    12.7
     Sept. 7     7 02.37    +23 21.4
          17     7 30.29    +20 50.5    1.807    1.617    12.4
          27     7 56.64    +17 56.7
     Oct.  7     8 21.21    +14 43.7    1.677    1.622    12.3
          17     8 43.87    +11 15.6
          27     9 04.48    + 7 36.5    1.558    1.651    12.2
     Nov.  6     9 22.90    + 3 50.8
          16     9 38.97    + 0 02.5    1.448    1.702    12.3
          26     9 52.47    - 3 43.9
     Dec.  6    10 03.14    - 7 23.9    1.348    1.771    12.4
          16    10 10.69    -10 52.4


1984 September 6               (3983)            Daniel W. E. Green

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