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IAUC 5929: P/SCHWASSMANN-WACHMANN 1; GRO J0422+32; TIME ADJUSTMENT ON 1994 JUNE 30; N Cas 1993

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                                                  Circular No. 5929
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)


PERIODIC COMET SCHWASSMANN-WACHMANN 1
     M. C. Senay and D. Jewitt, University of Hawaii, report:  "We
have detected CO J(2-1) emission at 230 GHz from P/Schwassmann-
Wachmann 1 on 1993 Oct. 22, Nov. 11 and 12 UT.  The observations
were taken using the JCMT on Mauna Kea, and give a line strength of
0.08 +/- 0.01 K km sE-1.  A preliminary estimate of the CO production
rate gives 2000 kg/s, which is sufficient to drive the dust
activity observed in this comet.  This observation provides the
first direct evidence that activity in comets beyond the orbit of
Jupiter can be powered by CO."


GRO J0422+32
     P. Zhao, P. Callanan, M. Garcia, and J. McClintock, Smithsonian
Astrophysical Observatory, write:  "On Jan. 30.29 UT, the x-ray nova
J0422+32 was fainter than at any time since its outburst in Aug.
1992 (IAUC 5580):  R = 20.03 +/- 0.11 and V = 20.67 +/- 0.22, which
is 8 mag fainter than its maximum brightness during outburst (IAUC
5588).  These CCD photometric data were obtained with the F. L.
Whipple Observatory's 1.2-m telescope.  The magnitudes on two
preceding nights were:  Jan. 21.15, R = 18.66 +/- 0.03, V = 19.31 +/-
0.06; 22.15, 19.09 +/- 0.16, 19.83 +/- 0.29.  This new faint state
provides the best opportunity to date of measuring the radial
velocity variations of the secondary star."


TIME ADJUSTMENT ON 1994 JUNE 30
     Bulletin C7 of the International Earth Rotation Service
announces that a positive leap second will be introduced such that
the sequence of UTC second markers will be:  1994 June 30d23h59m59s,
30d23h59m60s, July 1d00h00m00s.  Beginning 1994 July 1, the
difference UTC-TAI = -29s.


NOVA CASSIOPEIAE 1993
     Further photoelectric photometry (cf. IAUC 5920, 5928):  Jan.
24.58 UT, V = 7.56, B-V = +0.42, U-B = -0.65 (B. N. Ashoka, Bangalore,
India; comparison stars HR 9010, HR 8985); 25.58, 7.56, +0.41, -0.61
(Ashoka); 26.58, 7.70, +0.43, -0.62 (Ashoka); 28.59, 7.74, +0.44,
-0.64 (Ashoka); 29.58, 7.95, +0.41, -0.61 (Ashoka); 29.80, 8.05, -,
- (H. Mikuz, Ljubljana, Slovenia); 30.58, 8.08, +0.45, -0.65 (Ashoka);
30.75, 8.13, -, - (Mikuz); 31.58, 7.91, +0.44, -0.61 (Ashoka).


1994 February 4                (5929)            Daniel W. E. Green

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