Central Bureau for Astronomical Telegrams
IAUC 5129: 1990m; 1990U, 1990X, 1990aa
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Circular No. 5129
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
PERIODIC COMET HARRINGTON-ABELL (1990m)
J. V. Scotti, Lunar and Planetary Laboratory, University of
Arizona; and H. Rickman, Uppsala University, report independent
recoveries of this comet. The following positions are in
agreement with the orbital elements on MPC 13045:
1990 UT R.A. (1950) Decl. m2 Observer
Oct. 22.25874 0 47 07.57 +16 59 50.4 Scotti
22.28016 0 47 06.35 +16 59 45.8 21.0 "
22.30138 0 47 05.14 +16 59 41.5 "
23.889 0 45 37.57 +16 53 58.8 20.3 Rickman
23.942 0 45 34.49 +16 53 46.9 "
J. V. Scotti (Kitt Peak). Spacewatch telescope.
H. Rickman and G. Tancredi (Pic du Midi). 2-m reflector + R filter.
Reductions by Tancredi and M. Lindgren. Stellar appearance.
SUPERNOVAE 1990U, 1990X, 1990aa
R. Lopez, University of Barcelona, reports: "Low-resolution
spectra of several supernovae were taken on Oct. 24 with the faint
object spectrograph (range 460-980 nm) on the 4.2-m William Herschel
Telescope at La Palma, by G. Gomez, J. A. Rodriguez, A. Aparicio,
J. A. de Diego, and M. Kidger. SN 1990aa in UGC 540 seems to be a
helium-poor supernova (Ic); the He I 587.6-nm absorption feature
(blended with Na D absorption) is weak, and He I 706.5-nm is not
seen. Absorption features attributed to O I 777.3-nm, the Fe II
'620-nm' blend, and the Ca II infrared triplet (857.9 nm) are
present. Velocities inferred from these features are in the range
6700-10 500 km/s. The spectrum has prominent but narrow H-alpha
and [S II] (671.6, 673.0 nm) emission features at about the redshift
of the parent galaxy. The spectrum of SN 1990U in NGC 7479
shows that forbidden lines attributed to [O I] (630.0 nm), [Ca II]
(729.1, 732.1 nm), [O II] (731.9, 733.0 nm), and [C I] (872.7 nm)
are well marked, indicating that this helium-poor supernova has
overtaken its nebular phase. The spectrum of the type-II supernova
1990X in UGC 12565 shows the characteristic H-alpha (656.3 nm) P-Cyg
profile, with a broad emission and a well-marked absorption wings; a
relative velocity of about 7000 km/s is inferred. Absorption
features attributed to the Fe II '620-nm' blend, O I (777.3 nm), and
the Ca II infrared triplet (857.9 nm) are also present."
1990 October 31 (5129) Daniel W. E. Green
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