Central Bureau for Astronomical Telegrams
IAUC 5009: MWC 560; 1989c1
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Circular No. 5009
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
MWC 560
D. K. Lynch, R. J. Rudy, G. S. Rossano, and P. Erwin, Space
Science Laboratory, The Aerospace Corporation; and R. C. Puetter,
University of California at San Diego, communicate: "We report
infrared spectroscopy, using the 3-m Shane telescope at Lick Observatory
at 0.8-1.35 microns, of MWC 560 on Apr. 12.2 UT. The spectrum
showed TiO absorption bands near 847, 888, and 935 nm characteristic
of an M0-M5 giant. In addition, the absorption line due to He
I 1083-nm was seen blueshifted by 1550 km/s with a full-width-half-
maximum of 1800 km/s. The continuum between 1.09 and 1.2 microns
was irregular and suggests that other significant sources of
continuum emission were present in the region. No Paschen lines were
seen in either absorption or emission and no emission features were
detected, indicating low equivalent widths if present. The narrow-
band J magnitude was 6.3."
Visual magnitude estimates by P. Schmeer, Bischmisheim, W.
Germany (cf. IAUC 4997): Apr. 18.83 UT, 9.1; 29.85, 9.1.
COMET AUSTIN (1989c1)
R. W. Russell and D. K. Lynch, Space Sciences Laboratory, The
Aerospace Corporation; and M. S. Hanner, Jet Propulsion Laboratory,
California Institute of Technology, report: "We obtained infrared
circular-variable-filter spectroscopy and filter photometry of
comet Austin using the NASA Infrared Telescope Facility (+ AT1
instrument) on May 6.8 UT. A 5-mm (9".3) aperture and 45" north-south
throw were used. The spectra showed no 10-micron silicate emission
exceeding 20 percent of the continuum and are consistent with the
absence of silicate emission. Infrared magnitudes: 3.44 microns,
6.4 +/- 0.35; M(4.7 microns), 4.7 +/- 0.1; N(10.1 microns), 0.18 +/-
0.05; 10.3 microns, 0.13 +/- 0.05."
Total visual magnitude estimates (cf. IAUC 5004): May 2.95 UT,
5.3 (B. H. Granslo, Blindern, Oslo, Norway, 7x35 binoculars); 5.09,
5.6 (H. Mikuz, Ljubljana, Yugoslavia, 15x80 binoculars; 1.4 deg tail
in p.a. 297); 5.73, 5.4 (S. Hirai, Sapporo, Japan, 15x60 binoculars;
1.5 deg tail in p.a. 300); 7.09, 5.1 (A. Boattini, Monte Senario,
Italy, 20x80 binoculars; 2.0 deg tail in p.a. 274); 9.18, 4.9 (A.
Pereira, Linda-a-Velha, Portugal, 9x34 binoculars); 10.41, 5.5 (G.
Kronk, Troy, IL, 20x80 binoculars).
1990 May 10 (5009) Daniel W. E. Green
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