Central Bureau for Astronomical Telegrams
IAUC 5551: AC 211; V1333 Aql; N Sco 1992
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Circular No. 5551
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)
AC 211
S. A. Ilovaisky and C. Chevalier, Observatoire de Haute-
Provence; M. Auriere, Observatoire du Pic-du-Midi; L. Koch, Centre
d'Etudes Nucleaires de Saclay; J. P. Cordoni, Montpellier; and R.
Crowe, University of Hawaii, Hilo, report: "Analysis of over 500
CCD images of the core of the globular cluster M15, obtained from
1984 through 1989 with the 3.6-m Canada-France-Hawaii Telescope at
Mauna Kea, the 2-m TBL telescope at Pic-du-Midi, the 2.2-m University
of Hawaii telescope at Mauna Kea, and the 2.2-m Max-Planck-
Institut/European Southern Observatory telescope at La Silla,
reveals that the true orbital period of the low-mass x-ray binary AC
211 = X2127+119 is 17.11 hr, or twice the previously adopted value.
Re-analysis of published x-ray observations made with the HEAO-1,
EXOSAT, and Ginga satellites confirms this finding. The 1988 Ginga
x-ray light curve, in particular, exhibits a 30-percent peak-to-
peak modulation with a minimum lasting 0.2 times the period, which
is in phase with the optical minimum."
V1333 AQUILAE
S. A. Ilovaisky and C. Chevalier, Observatoire de Haute-
Provence, communicate: "Imaging observations made with the Haute-
Provence 1.93-m telescope (+ Tek512 CCD camera) on June 25/26 and
26/27 reveal that the optical counterpart of the Aquila X-1 recurrent
transient has now returned to quiescence. CCD images taken
with the OHP 1.2-m telescope show the object was still bright as
late as June 8. This probably signals the end of the current
outburst which was already in progress when the source was first
observed this year on Apr. 11 (IAUC 5507)."
NOVA SCORPII 1992
P. Camilleri, Cobram, Vic., reports that T. Lovejoy (Rosanna,
Vic.) recorded a pre-discovery image of Nova Sco 1992 on May 10.5
UT; the nova appears at mpv about 10, and is slightly trailed on
the 2-min exposure on T-Max 400 film.
Further photometry by A. C. Gilmore, Mt. John University
Observatory (cf. IAUC 5546): June 24.57 UT, V = 8.05 +/- 0.02, B-V =
+1.02 +/- 0.05, U-B = -0.07 +/- 0.02, V-R = +0.79 +/- 0.05, V-I =
+1.51 +/- 0.06.
1992 June 29 (5551) Daniel W. E. Green
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