Central Bureau for Astronomical Telegrams
IAUC 5057: 1990P; 1990K, 1990M, 1990Q; 1990c
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Circular No. 5057
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
SUPERNOVA 1990P IN ANONYMOUS GALAXY
R. H. McNaught, University of Adelaide, reports that this
object (cf. IAUC 5039, 5043) was recorded at magnitude V about 20.5
on a CCD image obtained by E. M. Sadler with the Anglo-Australian
Telescope (f/1 focal reducer) on July 21.6 UT. The image was
notably fainter than on the discovery R plate.
SUPERNOVAE 1990K, 1990M, 1990Q
R. Lopez, University of Barcelona; G. Gomez, Instituto de
Astrofisica de Canarias; M. Breare, Royal Greenwich Observatory;
and J. Rodriguez, Observatorio de Roque de los Muchachos (ORM),
report: "Low-resolution spectra (range 330-1050 nm) were taken on
July 19 with the Faint Objects Spectrograph on the ORM 2.5-m Isaac
Newton Telescope of the type-II SN 1990Q in NGC 5917. The first-
order spectrum shows a well-marked H-alpha (656.3 nm) P-Cyg profile,
from which can be inferred a velocity of about 8600 km/s. Absorptions
due to He I (706.5 nm) and the Ca II infrared triplet ('857.9'
nm) are also present, giving expansion velocities of about 7000 and
6000 km/s, respectively. The supernova appears as bright as the
host galaxy. Low-resolution spectra of the type-Ia SN 1990M in NGC
5493 indicate that this object is about one month past maximum
brightness. Spectra are dominated by absorption Fe II blends (492.4,
521.5, 553.5, 620 nm), from which can be inferred expansion velocities
in the range of 10 500-13 000 km/s. Absorption features, attributed
to O I (777.3 nm) and the Ca II infrared triplet ('857.9'
nm), are present. Expansion velocity inferred from these features
is about 11 000 km/s. Low-resolution spectra of the type-II SN 1990K
in NGC 150 show the characteristic H-alpha (656.3 nm) P-Cyg feature
with a well developed emission. The expansion velocity inferred
from this feature is about 7600 km/s."
COMET LEVY (1990c)
Total visual magnitude estimates (cf. IAUC 5042): July 1.31 UT,
8.5 (V. F. de Assis Neto, Sao Francisco de Oliveira, Brazil, 10x70
binoculars); 11.90, 7.8 (J.-C. Merlin, Le Creusot, France, 7x50
binoculars); 15.26, 7.0 (C. S. Morris, Pine Mountain Club, CA, 20x80
binoculars; faint, diffuse tail about 1 deg long); 20.26, 6.7
(Morris, Whitaker Peak, CA); 21.94, 6.7 (Merlin; 2 deg tail); 23.97,
6.6 (J. Shanklin, Cambridge, England, 7x50 binoculars).
1990 July 24 (5057) Daniel W. E. Green
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