Central Bureau for Astronomical Telegrams
IAUC 5521: 1992U; NGC 5548; 1991l
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Circular No. 5521
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)
SUPERNOVA 1992U IN ESO 74-G4
M. M. Phillips, Cerro Tololo Interamerican Observatory, reports
that a spectrogram of SN 1992U (cf. IAUC 5499) obtained with
the CTIO 4.0-m telescope on May 12.33 UT shows broad H-beta and H-
alpha emission lines with P-Cyg profiles, indicating that this is a
type-II event. The supernova is imbedded in an H II region whose
narrow emission lines yield a redshift of z = 0.011.
NGC 5548
T. Iijima, Asiago Astrophysical Observatory, reports: "Spectra
of the Seyfert 1.5 galaxy NGC 5548 (range 400-700 nm, resolution
0.2 nm) taken on May 11 and 12 with the Mt. Ekar 1.82-m reflector
show that the broad emission component of hydrogen Balmer lines,
which were clearly visible on the spectra taken in and earlier than
1992 Feb., nearly disappeared. The nucleus of this galaxy has
probably entered a new stage of lowest activity."
COMET HELIN-LAWRENCE (1991l)
Ephemeris from orbital elements on MPC 19654:
1992 TT R. A. (2000) Decl. Delta r Elong. Phase m1
May 18 2 05.39 - 3 33.5 2.984 2.204 32.9 14.4 12.4
28 2 09.61 - 1 07.8 2.991 2.297 39.2 16.2 12.5
June 7 2 12.81 + 1 06.7 2.976 2.391 46.4 17.9 12.6
17 2 14.79 + 3 12.0 2.941 2.487 54.2 19.4 12.7
27 2 15.30 + 5 09.5 2.888 2.584 62.6 20.5 12.8
July 7 2 14.05 + 7 00.4 2.821 2.681 71.7 21.1 12.8
17 2 10.71 + 8 45.1 2.745 2.780 81.3 21.2 12.9
27 2 04.94 +10 23.9 2.664 2.878 91.6 20.7 12.9
Aug. 6 1 56.40 +11 55.8 2.586 2.977 102.6 19.4 12.9
16 1 44.92 +13 18.9 2.517 3.075 114.3 17.5 12.9
26 1 30.49 +14 30.3 2.465 3.174 126.7 14.8 13.0
Sept. 5 1 13.47 +15 26.5 2.440 3.273 139.5 11.5 13.0
15 0 54.69 +16 04.6 2.449 3.371 152.1 8.0 13.1
25 0 35.28 +16 23.4 2.497 3.469 163.2 4.8 13.2
Oct. 5 0 16.57 +16 24.9 2.587 3.567 166.5 3.8 13.4
15 23 59.71 +16 13.6 2.718 3.665 158.7 5.7 13.6
25 23 45.46 +15 55.4 2.886 3.762 147.4 8.2 13.8
1992 May 15 (5521) Daniel W. E. Green
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