Central Bureau for Astronomical Telegrams
IAUC 4433: 1987s; N Her 1987; 1987i
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 4434
Circular No. 4433
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-495-7244/7440/7444
COMET BRADFIELD (1987s)
The following precise positions have been reported:
1987 UT R. A. (1950) Decl. m1 Observer
Aug. 12.34219 14 11 22.46 -23 07 14.9 9 Gilmore
12.35191 14 11 23.04 -23 07 08.2 "
12.38749 14 11 25.80 -23 06 37.9 McNaught
12.39682 14 11 26.52 -23 06 30.0 8.5: "
A. C. Gilmore and P. M. Kilmartin (Mt. John Obs.). Images trailed.
Visual m1 = 9.3 on Aug. 12.35 (0.10-m refractor; coma dia. 5').
R. H. McNaught (Siding Spring Obs.). Uppsala Southern Schmidt;
first exposure Tri-X film, second exposure IIIaF hypered plate.
NOVA HERCULIS 1987
Y. Andrillat, Laboratoire d'Astronomie, Universite des Sciences
et Techniques du Languedoc, Montpellier; and L. Houziaux, Institut
d'Astrophysique, Universite de Liege, telex: "A spectrum
(range 665-1050 nm) taken of Nova Her 1987 at Observatoire de
Haute-Provence on June 5 shows a strong blend around H-alpha. The
brightest features besides H-alpha are [O II] (733 nm), O I (844.6 nm),
a blend of Paschen 9 (= P9) and S I (923.2 nm), a blend of P7 and
He II (1012.4 nm), and [N I] (1040 nm), which on average are all
3-4 times above the continuum level. Moderately strong features
include He I (706.5 nm), C II (723.6 nm), C IV (772.4 nm), He II +
O I + N I (823.4 nm), and S I (904.0 nm; blend with P10). The
Paschen series is visible up to P13. A double-structure line
centered on 991.2 nm is typical of the presence of S VIII ions under
nebular conditions. This confirms the suggestion by Dinnerstein
et al. (IAUC 4425) that an early 'coronal' region is currently
developing around this nova, especially as we also observe the onset
of [Ni XV] at 802.4 nm and of [Fe XI] at 789.1 nm."
PERIODIC COMET KLEMOLA (1987i)
Total visual magnitude estimates (L = reflector): July 25.39
UT, 13.0 (A. Hale, Las Cruces, NM, 0.41-m L); 26.38, 12.8 (C. S.
Morris, Lockwood Valley, CA, 0.26-m L); 28.32, 12.7 (J. E. Bortle,
Stormville, NY, 0.32-m L); Aug. 1.41, 12.8 (Hale); 2.06, 12.0 (M.
V. Zanotta, near Como, Italy, 0.41-m L).
1987 August 13 (4433) Daniel W. E. Green
Read IAUC 4434
Our Web policy. Index to the CBAT/MPC/ICQ pages.
