Central Bureau for Astronomical Telegrams
IAUC 4125: 1982i; G24-9
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Circular No. 4125
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 617-495-7244/7440/7444
PERIODIC COMET HALLEY (1982i)
S. M. Larson, Lunar and Planetary Laboratory reports: "300-
550-nm spectra taken on Oct. 14.4 UT with the 1.54-m Catalina
reflector show prominent emissions of OH, NH, CN, C2 and C3 extending
to at least 2'7 from the nuclear condensation. There was no
indication of ionic emissions. The continuum, confined to some 0'5
of the nucleus on the spectra and direct images, is slightly
asymmetric toward the sun. Broadband CCD images taken with the same
telescope on Aug. 16, Sept. 9 and Oct. 15 show no evidence of
discrete coma features."
S. Wyckoff and P. A. Wehinger, Arizona State University,
report: "Spectra of P/Halley (r = 2.11 AU, A = 1.50 AU) were
obtained on Oct 18.4 UT with 4.5-m Multiple-Mirror Telescope and
intensified reticon spectrograph at the F. L. Whipple Observatory.
The 50-min integration spectra cover a wavelength range 300-700 nm
with a resolution of 0.5 nm. Tentative identifications of emission
features include: OH (0-0) 308.0, OH (1-1) 313.0, NH 336.0,
CN (1-0) 358.0, CN (0-0) 388.3, CE 404.0, CN (0-1) 421.6, CH 431.5,
CW (1-0) 473.7, CW (0-0) 516.5, CW (0-1) 563.5, NHW (9-0) 570.5,
HWO+ (8-0) 620.0 and [O I] 630.0 nm."
W. Landgraf telexes that exposures taken at Mainz by R.
Riemann and himself with a 0.20-m Schmidt-Cassegrain telescope on
Oct. 14.0 show five jets. One is sharply defined and 22" long,
leaving the coma in p.a. 247 and curving to its endpoint in p.a.
333. Another, fainter and 18" long, begins in p.a. 328 and
curves to p.a. 297. The third and brightest is 22" long in p.a.
336. A jet 18" long leaves the nucleus in p.a. 119 and curves
to p.a. 170. The final fainter jet is 16" long in p.a. 75.
G24-9
A. U. Landolt, Louisiana State University Observatory, reports
on the apparent variability of the proposed spectrophotometric
standard star G24-9 (Filippenko and Greenstein 1984, P.A.S.P. 96,
530). The magnitude and colors normally are V = 15.76 +/- 0.03, B-V
= +0.42 +/- 0.04, U-B = -0.48 +/- 0.04. On Oct. 7.11 UT, however, the
star was found at V = 18.29, B-V = +0.79, U-B = +0.67 (all +/- 0.2).
Filippenko and Greenstein report a spectral type of DQ7. Observers
are urged to follow this potential white-dwarf eclipsing system.
1985 October 25 (4125) Brian G. Marsden
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