Central Bureau for Astronomical Telegrams
IAUC 4967: 4U 0115+63; 1990B; JUPITER
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Circular No. 4967
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
4U 0115+63
F. Makino and the Ginga Team, Institute of Space and Astronautical
Science, telex: "X-ray activity from the transient pulsar 4U 0115+63
was detected on Feb. 5 with the All-Sky Monitor (ASM) aboard Ginga.
The source was also observed with the Large Area Counter (LAC) of
Ginga on Feb. 9, 11 and 12. Rough x-ray intensities obtained with
the ASM: Feb. 2.88 UT, < 50 mCrab; Feb. 5.85, 100; Feb. 6.85, 100;
and Feb. 15.60, 300. Intensities obtained with the LAC: Feb. 9.86,
400 mCrab; Feb. 11.88, 400; and Feb. 12.79, 300. The x-ray flux
observed with the LAC exhibited large variations of factors > 3 on
timescales of about 10 min. The heliocentric pulse period was 3.6144
+/- 0.0001 s on Feb. 9."
SUPERNOVA 1990B IN NGC 4568
S. Benetti, E. Cappellaro, and M. Turatto, Asiago Astrophysical
Observatory, report: "We obtained two CCD spectra of SN 1990B on
Feb. 3 and 20 at the 1.82-m Cima Ekar telescope. The SN appears
projected on a H II region for which we derive a heliocentric
velocity of 2200 km/s. Both spectra are dominated by a strong
absorption at 569.2 and 570.5 nm, respectively (in the galaxy rest
frame), while other absorption-like features appear on the good-S/N
spectrum of Feb. 20 at 504.8, 540.2, 608.9, and 632.6 nm. These
observations confirm the classification of SN 1990B as type Ib,
two to four weeks after maximum. A strong interstellar Na D
absorption (equivalent width 0.7 nm) is an indication that the SN
is heavily obscured by dust in the parent galaxy. The strength
of the Na D line, according to an empirical relation derived
for other SNe, suggests that the color excess E(B-V) is close to
1.5 mag."
JUPITER
I. Miyazaki, Oriental Astronomical Association, reports the
appearance of a rare, bright white spot in the North Temperate
Belt of Jupiter. At zenographical latitude about +24 deg, the
location of a well-known jetstream called North Temperate Current
C, the rapidly-moving spot was measured at the following longitudes
(System II): Feb. 10.55 UT, 265.7 deg; 12.61, 241.6; 15.47, 204.1.
A similar spot was observed in 1980 (IAUC 3478).
1990 February 22 (4967) Daniel W. E. Green
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