Central Bureau for Astronomical Telegrams
IAUC 5107: V1333 Aql; 1990d; GK Per
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 5108
Circular No. 5107
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
V1333 AQUILAE
S. A. Ilovaisky and C. Chevalier, Observatoire de Haute-
Provence, write: "CCD photometry of V1333 Aql (the optical
counterpart of the low-mass recurrent x-ray transient Aquila X-1)
throughout its current outburst, obtained with the 1.2-m OHP
reflector, shows that the object was as bright on Sept. 19 as three
months earlier when first observed, 1-2 weeks after turn-on (IAUC
5036). The star is seen to vary on timescales ranging from hours to
days. Its magnitude seldom rises above V = 17.5 and has dropped
on occasions to V = 18.1 (normal quiescent level is V = 19.3).
This extended activity behavior at mid-intensity is strikingly
different from the other previous well-recorded outburst in 1978
(Charles et al. 1980, Ap.J. 237, 154; Lyutyj and Shugarov 1980,
Sov. Ast. Let. 5, 206), when the object exhibited a decline from
V = 15.5 to 18 over about 2 months. X-ray and/or radio observations
are urgently needed. Further optical monitoring is planned
at OHP."
PERIODIC COMET PETERS-HARTLEY (1990d)
Extended ephemeris from orbital elements on IAUC 5026:
1990 ET R.A. (1950) Decl. Delta r m1
Sept.26 16 57.53 - 8 44.5 1.930 1.889 15.6
Oct. 6 17 19.96 - 8 02.6
16 17 42.00 - 7 20.5 2.205 1.994 16.2
26 18 03.67 - 6 36.2
Nov. 5 18 24.95 - 5 47.9 2.484 2.108 16.8
15 18 45.83 - 4 54.5
25 19 06.30 - 3 55.3 2.757 2.228 17.4
Dec. 5 19 26.32 - 2 49.7
15 19 45.88 - 1 37.6 3.017 2.352 18.0
GK PERSEI
Visual magnitude estimates (cf. IAUC 4891): 1989 Dec. 2.71 UT,
13.0 (A. Boattini, Florence, Italy); 1990 Jan. 30.81, 13.0 (P.
Schmeer, Bischmisheim, West Germany); Mar. 3.80, 13.1 (Boattini);
Apr. 16.79, 13.2 (Boattini); July 18.06, 13.0 (Schmeer); Aug. 18.10,
13.0 (Schmeer); Sept. 20.90, 13.1 (Boattini, Botinaccio, Italy).
1990 October 1 (5107) Daniel W. E. Green
Read IAUC 5108
Our Web policy. Index to the CBAT/MPC/ICQ pages.
