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IAUC 5831: V1333 Aql; N Oph 1993 AND N Aql 1993; 1993J

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                                                  Circular No. 5831
Central Bureau for Astronomical Telegrams
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

     S. A. Ilovaisky and C. Chevalier, Observatoire de Haute-
Provence, write:  "CCD photometry of the optical counterpart of the
recurrent x-ray transient V1333 Aql (Aquila X-1), obtained at
Haute-Provence with the 1.2-m telescope on July 15, reveals that
the source has turned on again and is now at a brightness level (V
= 17.7) typical of previous recent episodes.  When it was last
observed on May 3, the object was still in quiescence.  This new
event arrives apparently at least two months earlier than expected
from predictions based on the 1989-1992 episodes (see IAUC 5665)."

     R. W. Argyle and L. V. Morrison, Royal Greenwich Observatory,
report accurate positions for N Oph 1993 and N Aql 1993 obtained
with the Carlsberg Automatic Meridian Circle on La Palma, operated
by J. L. Muinos, D. W. Evans, P. Jensen, and B. Jensen.  In both
cases, the observed positions are given for equinox J2000.0, FK5
reference frame, and epoch 1993.45:  N Oph 1993, R.A. =
17h25m06s.410 +/- 0s.006, Decl. = -23 11'11".10 +/- 0".08 (
corresponding 1950.0 position: R.A. = 17h22m04s.396, Decl. =
-23 08'32".55); N Aql 1993, R.A. = 19h13m06s.804 +/- 0s.003,
Decl. = +1 34'23".33 +/- 0".05 (corresponding 1950.0 position:
R.A. = 19h10m34s.712, Decl. = +1 29'14".29).
     J. Elias, Cerro Tololo Interamerican Observatory (CTIO),
communicates that infrared spectrograms of Nova Aql 1993, taken on
July 14.1 UT by D. DePoy, R. Blum, and K. Sellgren (Ohio State
University), H. Tirado (CTIO), and himself with the OSU Infrared
Imager Spectrometer on the CTIO 4-m telescope show a strong, red
continuum in the H and K bands, probably indicative of dust formation.
Emission lines of H I, He I 1083.0-nm, and O I 1128.7-nm are also

     Further photoelectric photometry by H. Mikuz, B. Dintinjana,
and T. Zwitter, Ljubljana, Slovenia (cf. IAUC 5796):  July 7.88 UT,
B = 14.13 +/- 0.03, V = 13.15 +/- 0.02, R = 12.80 +/- 0.03, I =
12.44 +/- 0.04; 13.86, B = 13.99 +/- 0.02, V = 13.51 +/- 0.01, R =
13.01 +/- 0.02, I = 12.51 +/- 0.01.

1993 July 16                   (5831)            Daniel W. E. Green

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