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IAUC 3110: 1977n; N Oph 1977

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IAUC number

                                                  Circular No. 3110
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK     Telex: 921428
Telephone: (617) 864-5758

     This comet has been recovered by R. E. McCrosky, G. Schwartz
and C.-Y. Shao with the 155-cm reflector at Harvard Observatory's
Agassiz Station.  It appears as a weak, diffuse spot.  The indicated
correction to the ephemeris on IAUC 3079 is Delta-T = -0.06 day.

     1977 UT             R. A. (1950) Decl.        m2
     Sept.11.23583     0 28 56.38   -14 36 20.4  20.0-20.5
          12.22506     0 28 16.91   -14 41 17.0

     HEAO-1 experimenters report that they have independently discovered
the x-ray transient described on IAUC 3104.  R. Griffiths,
M. Johnston, R. Doxsey, G. Fabbiano, D. Schwartz and J. Schwarz report
that the Smithsonian Astrophysical Observatory-Massachusetts
Institute of Technology scanning modulation collimator, used in conjunction
with the Naval Research Laboratory large-area sky survey
(H. Friedman, Principal Investigator), gives two possible positions
for the transient: R.A. = 17h04m02s, Decl. = -25o00' or 17h05m11s, -25o01'
(equinox 1950.0; errors +/- 2s in R.A., +/- 2' in Decl.).  The intensity,
measured on Sept. 8 by N.R.L., was ~ 1.5 times the Crab in the energy
range 0.2-1.2 keV and 1.25 times the Crab in the range 1.2-7.4 keV.

     A. Longmore, R. Cannon, P. Murdin and D. Malin, U.K. Schmidt
Telescope Unit and Anglo-Australian Observatory, report the discovery
on independent plates taken with the 122-cm Schmidt and the 380-cm
telescope of a nova, its magnitude ~ 16.5 +/- 0.5 on Sept. 10, at
the position R.A. = 17h05m10s.4, Decl. = -25o01'38" (equinox 1950.0), which
is close to the center of the second x-ray error box.  A possible
precursor star is visible at the plate limit on glass copies of the
red and blue Palomar Sky Survey exposures and a U.K. Schmidt IIIa-J
survey plate taken on 1976 May 29.  A low-dispersion spectrogram
obtained by Cannon, M. Smith and A. Boksenberg with the 380-cm
telescope shows a blue, featureless continuum.

     W. Liller, Center for Astrophysics, reports that observations
with the Mt. Hopkins 150-cm telescope on Sept. 15.2, 18.1 and 19.1
UT show the star more-or-less constant at red magnitude 15.7 +/- 0.5
and approximately 0.5 magnitude bluer than the average of similar
stars in the vicinity.  On Sept. 18.1 the star displayed a featureless
spectrum (low dispersion, range 6000-9000 A).

1977 September 20              (3110)              Brian G. Marsden

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