Central Bureau for Astronomical Telegrams
IAUC 6143: JUPITER I (IO); Poss. N LMC; X-RAY N 1994 IN Sco; 1995 DA2, 1995 DB2, 1995 DC2
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Circular No. 6143
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444 TWX 710-320-6842 ASTROGRAM CAM
MARSDEN@CFA.HARVARD.EDU or GREEN@CFA.HARVARD.EDU (science)
JUPITER I (IO)
J. R. Spencer, J. E. B. Spencer, and D. Griep, NASA Infrared
Telescope Facility (IRTF), report their observation at 3.5-4.8
microns of a major volcanic outburst on Io, observed during Mar.
2.66 to 2.75 UT: "The outburst was seen in disk-resolved images at
the IRTF and is also apparent in preliminary 5-micron photometry.
The location of the spot in the images is very roughly near longitude
130 deg, latitude -20 deg (visual estimate only), so it is still
rotating onto the disk at this time. Such outbursts tend to last
only a few hr, so further imaging, photometry, or spectroscopy is
requested."
POSSIBLE NOVA IN THE LARGE MAGELLANIC CLOUD
W. Liller, Instituto Isaac Newton, Vina del Mar, reports his
discovery of a possible nova on a pair of Technical Pan films taken
of the LMC on Mar. 2.11 UT. The object is located at R.A. = 5h26m.8,
Decl. = -70o01' (equinox 2000.0); this is about 3' northeast of a
star of mag 7.9. Approximate magnitude estimates for the possible
nova: Feb. 25.146, 12.6; Mar. 2.11, 10.7.
X-RAY NOVA 1994 IN SCORPIUS
N. Alexandrovich, K. Borozdin, and R. Sunyaev, on behalf of
the MIR-Kvant team, report: "The superluminal radio source GRO
J1655-40 (cf. IAUC 6046, 6051, 6056, 6078, 6087, etc.) was found to
be very bright during a TTM observation on Feb. 22. The flux in
the energy band 3-5 keV was close to 1.7 Crab. The source spectrum
was soft and could be approximated by a blackbody fit, with
temperature kT = 1.04 +/- 0.02 keV in the energy band 2-12 keV."
1995 DA2, 1995 DB2, 1995 DC2
MPEC 1995-E05, 1995-E06, and 1995-E07 contain reports of the
discovery by J. Luu (Center for Astrophysics) and D. Jewitt (
University of Hawaii) of three new transneptunian objects. Circular
orbits computed by B. G. Marsden have radii of 34.283, 40.953, and
45.406 AU, respectively. 1995 DA2 and DB2 are almost opposite
Neptune and within about 1 deg of each other. Marsden notes that
the stability of 1995 DA2 is best assured by supposing this object
to be near perihelion in a 1:2 Neptune-librating orbit, and he
suggests that 1995 DB2 may represent a similar -- but less extreme
-- case.
1995 March 2 (6143) Daniel W. E. Green
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