IAU Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 4806: 1989 N 1; Occn OF 28 Sgr BY TITAN; mu Cen; 1987A

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 4805  SEARCH Read IAUC 4807
IAUC number


                                                Circular No. 4806
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


1989 N 1
     B. A. Smith and S. P. Synnott report that a previously
unknown satellite of Neptune has been discovered in Voyager 2
narrow-angle imaging data.  It has been observed in 17 frames
over a time span of 21 days, during which the measurement error
changed from about 1000 km per narrow-angle pixel to about 700 km.
The rms post-fit residuals are about 1 pixel. The orbit is
prograde and appears to be very nearly circular and equatorial.
The period is 1.1223 days, with an uncertainty of 0.0005 days,
and it moves at a mean radial distance of about 117 500 km. The
eccentricity appears to be less than 0.01, and the inclination
is of the order of a degree or less.  The satellite would have
been at greatest eastern elongation on June 22d20h26m UT. The
object is about one visual magnitude fainter than Nereid in the
Voyager 2 narrow-angle clear filter.


OCCULTATION OF 28 SAGITTARII BY TITAN
     P. Schmeer, Bischmisheim (Long. = -7 03'42", Lat. =
+49 12'52", h = 293 m), West Germany, reports his timings (cf.
IAUC 4801, 4803) of this event obtained with a 0.20-m f/10
reflector (133x):  t3 = 43m53s.8, t4 = 44m28s.8, +/- 0.3 s.


mu CENTAURI
     J. C. Bhattacharyya, Indian Institute of Astrophysics,
Bangalore, reports:  "CCD spectroscopic observations with the
echelle spectrograph at the coude focus of the 1-m reflector at
Vainu Bappu Observatory, obtained by K. K. Ghosh, K. Kuppuswamy,
A. Ramachandran, K. Rajkumar, K. Ravi, and N. Dinakaran, revealed
that the recurrent, transient Be-type star mu Cen developed
H-alpha emission between Apr. 15 (H-alpha asymmetric absorption)
and June 22 (centrally-reversed H-alpha, V/R about 1).  By June
24 the H-alpha emission strength had definitely increased."


SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
     Visual magnitude estimates (cf. IAUC 4761):  Mar. 13.51 UT,
12.6 (A. Pearce, Perth, W. Australia); 28.50, 12.7 (Pearce);
Apr. 10.39, 12.7 (P. Williams, Heathcote, N.S.W.); 25.48, 12.8
(Pearce); May 5.48, 12.8 (Pearce); June 1.42, 13.0 (Williams);
24.52, 13.2 (Pearce).


1989 July 7                    (4806)             Daniel W. E. Green

Read IAUC 4805  SEARCH Read IAUC 4807


Our Web policy. Index to the CBAT/MPC/ICQ pages.


Valid HTML 4.01!