Central Bureau for Astronomical Telegrams
IAUC 3809: 1983d; PSR 1937+214; Var STAR IN Ori
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Read IAUC 3810
Circular No. 3809
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-864-5758
COMET IRAS-ARAKI-ALCOCK (1983d)
D. P. Cruikshank, R. H. Brown and D. Griep, University of
Hawaii, telex: "Infrared photometry was obtained on May 6.6, 7.6
and 8.6 UT at the Infrared Telescope Facility at Mauna Kea.
Observations were in nine filter bands from L through Q (3.3-20 microns)
with special emphasis on the 10-micron region. The data fit a
blackbody curve for ~ 300 K, with no evidence of a silicate-emission
feature. Spectrophotometric scans of the nuclear condensation
from 0.8 to 2.6 microns showed no emission features at 5-percent
resolution, but the thermal component of the energy distribution was
apparent longward of ~ 2.4 microns. Spatial scans at 11.6 and 20
microns give a halfpower width of 6" for the nuclear condensation."
P. D. Feldman, Johns Hopkins University; and M. F. A'Hearn,
University of Maryland, report the discovery of a series of
emission bands between 280 and 310 nm in observations using IUE at
Goddard Space Flight Center during May 11.8-13.0 UT. They identify
the emission, which is confined to a region of diameter no
larger than 100 km (5") around the comet's nucleus, as due to S2.
PSR 1937+214
M. J. Lebofsky and G. H. Rieke, Steward Observatory, report:
"Djorgovski's (1982, Nature 300, 618) candidate star is unlikely
to be the optical counterpart to PSR 1937+214. We have used the
Multi-Mirror Telescope to obtain a photometric CO index of 0.19 +/-
0.03 for it; therefore it probably has CO bands in absorption at
2.3 microns, and both its photometric colors and its CO band strength
are consistent with its identification as a K giant reddened by 8
magnitudes. Our position for this object is consistent with that
reported on IAUC 3795 and indicates a small but probably
significant offset from the radio position of the pulsar."
VARIABLE STAR IN ORION
G. Klare and I. Appenzeller, Landessternwarte Heidelberg-
Konigstuhl, write that plates taken early in the century with the
0.4-m f/5 Bruce astrograph show that this object was significantly
brighter than on the Palomar Sky Survey (cf. IAUC 3763). On 1901
Jan. 16 the object was clearly visible at a measured B = 17.5. On
1904 Jan. 10 the object was close to the plate limit at an
estimated B ~ 17.5.
1983 May 13 (3809) Brian G. Marsden
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