Central Bureau for Astronomical Telegrams
IAUC 6181: PKS 1622-297; 1991 JX; N Aql 1995
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Circular No. 6181
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
Phone 617-495-7244/7440/7444 (for emergency use only)
PKS 1622-297
J. R. Mattox, University of Maryland and Universities Space
Research Association; S. Wagner, Landessternwarte Heidelberg; T. A.
McGlynn, Compton Observatory Science Support Center; M. Malkan,
University of California, Los Angeles; J. F. Schachter, Harvard-
Smithsonian Center for Astrophysics, communicate: "The EGRET
instrument aboard the Compton Observatory indicates that the flux
of PKS 1622-297 at E > 100 MeV continues at a high level on June 25,
the last day for which data have been analyzed. A GRO Target of
Opportunity observation is scheduled to begin on June 30 to better
observe this flare with EGRET, COMPTEL, and OSSE. The pointing is
scheduled to continue until July 5. Observations at other
wavelengths are of tremendous interest. High-temporal-density
optical, infrared, and mm observations are expected to be of
particular value."
1991 JX
A. W. Harris and G. Hahn, DLR Institute for Planetary Explora-
tion, Berlin; and J. Davies, Joint Astronomy Centre, Hilo, write:
"Thermal infrared observations of near-Earth asteroid 1991 JX were
made at Mauna Kea with the U.K. Infrared Telescope (UKIRT; + CGS3
spectrometer; range 10-20 microns) as part of the UKIRT service
observing program on June 16, when the geocentric distance = 0.05
AU. The 10.6-micron flux was < 220 mJy. Assuming a visual albedo
of 0.4 for a Vesta-like object (Hicks and Grundy, IAUC 6177), the
10.6-micron flux upper limit indicates a spherical equivalent
diameter for 1991 JX of < 0.34 km (a lower albedo would imply an
even smaller diameter). We note that an albedo of 0.4, combined
with an absolute magnitude H = 19.13 (S. Mottola, private
communication), leads to a diameter estimate of 0.32 km, which is
in excellent agreement with the 10.6-micron observations."
NOVA AQUILAE 1995
B. Skiff, Lowell Observatory, notes that examination of
original Palomar Sky Survey prints for a precursor star, at the
position published on IAUC 6174, shows nothing; the nearest star (B
about 20, neutral color) lies about 1".7 southeast at R.A. =
19h05m26s.73 (+/- 0".2), Decl. = -1o42'04".2 +/- 0".3 (equinox
J2000.0, epoch 1950 July 19.3 UT). Skiff further notes that it is
possible that proper motion shifted the nova a couple of arcsec
over the past 45 years, so searches on more recent plates are
warranted.
1995 June 29 (6181) Daniel W. E. Green
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