Central Bureau for Astronomical Telegrams
IAUC 4810: 1989o; V404 Cyg
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Circular No. 4810
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 or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
PERIODIC COMET BRORSEN-METCALF (1989o)
D. G. Schleicher, D. J. Osip, and R. L. Millis, Lowell
Observatory, communicate: "We report gas production rates from
aperture photometry obtained on July 7.43 UT, using the Lowell
1.07-m telescope: log Q(OH) = 27.8, log Q(CN) = 25.4, log Q(C2)
= 25.3, log Q(C3) = 24.2, log Q(NH) = 25.0. The gas-to-dust
ratio is high, with log Q(OH)/(A f rho) = 26.2 (cf. A'Hearn et al.
1984, A.J. 89, 579). Continuum magnitude at 485 nm within a 75"-
diameter aperture is about 14.0. The comet is extremely diffuse,
presumably due to the low concentration of dust."
R. M. Wagner, R. Bertram, and J. Beaver, Ohio State
University; and D. G. Schleicher and B. L. Lutz, Lowell Observatory,
report: "Long-slit spectra were obtained on July 7.44 UT using
the OSU CCD Spectrograph (spectral range 360-620 nm, resolution
0.8 nm) on the Perkins 1.8-m reflector at Lowell Observatory.
Strong molecular emissions of CN, C3, CH, C2, and NH2 were present,
superposed on a very weak continuum. CN (Delta v=0) and C2
(Delta v=0) emission extended for at least 5' along the projected
length of the slit."
H. Spinrad reports that spectra obtained by M. Dickinson, R.
Dey, and himself with the low-resolution spectrograph (range 390-800
nm) on the 3-m Shane reflector at the Lick Observatory on July 7.47
UT show strong C2 and O I and detectable C3 and CN emission. The
continuum was moderately weak.
Total visual magnitude estimates: July 8.45 UT, 9.6 (C. S.
Morris, Pine Mountain Club, CA, 20x80 binoculars; 9' coma); 10.76,
9.0 (D. A. J. Seargent, The Entrance, N.S.W., 0.15-m reflector);
12.30, 7.8 (D. W. E. Green, Harvard, MA, 7x50 binoculars; 12' coma);
13.32, 8.1 (J. E. Bortle, Stormville, NY, 10x50 binoculars; 10' coma).
V404 CYGNI
Visual magnitude estimates: June 8.38 UT, [14.0 (C. Scovil,
Wrightwood, CA); 12.23, 15.9 (N. Chanover, Maria Mitchell
Observatory; photographic); 14.05, 13.8 (M. Verdenet, Bourbon-Lancy,
France); July 10.24, 15.3 (Scovil, Stamford, CT).
Corrigenda. On IAUC 4793, last line, delete the observations
by J. E. Bortle. On IAUC 4787, last line, for May 28.04 UT, 11.9;
read May 28.06 UT, 12.0;
1989 July 13 (4810) Daniel W. E. Green
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