Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 4997: NO N IN Sco; MWC 560; 1989c1

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 4996 SEARCH Read IAUC 4998
IAUC number 

                                                  Circular No. 4997
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


NO NOVA IN SCORPIUS
     W. Liller, Vina del Mar, Chile, reports that photographs taken
Apr. 18.3 UT failed to show the object reported on IAUC 4995.


MWC 560
     N. Sanduleak, Warner and Swasey Observatory, Case Western
Reserve University, communicates:  "Ten-degree objective-prism
spectra taken Mar. 24 with the Burrell Schmidt telescope show
moderately strong absorption components to both H-beta and H-gamma
(cf. IAUC 4980) with approximate velocities of -4200 and -5500 km/s
and widths of about 300 and 500 km/s, respectively.  Emission is
seen down to H-epsilon with a steeper decrement than in pre-outburst
spectra in our files.  The only emission feature detected in the
530- to 880-nm region is H-alpha.    The TiO bands of the M4 star
are heavily veiled blueward of the 705.4-nm band."
     Further visual magnitude estimates (cf. IAUC 4987) by P.
Schmeer, Bischmisheim, West Germany:  Mar. 27.86 UT, 9.2; 30.85,
9.2; 31.88, 9.0; Apr. 1.86, 9.0; 4.82, 9.0; 11.85, 9.2; 14.84, 9.1.


COMET AUSTIN (1989c1)
     D. W. Dunham, International Occultation Timing Association and
Computer Sciences Corporation, Greenbelt, MD, has calculated
appulses and possible occultations of stars by comet Austin by a
computer comparison of an ephemeris derived from the orbital elements
given on IAUC 4985 with the SAO and AGK3 catalogs.  Following
are the predicted date and time (UT) of closest approach, the star
and its visual magnitude, and the area in which an occultation may
be observable:  May 11, 4h49m, SAO 72873, 8.6 (Canary Is., northwest
Africa); May 12, 5h12m, SAO 72727, 8.1 (Canary Is.); May 22, 12h56m,
iota Del, 4.4 (Chile, Brazil, in daylight); May 24, 14h59m, SAO
125402, 8.6 (New Zealand); May 25, 21h07m, SAO 124991, 8.1 (Sumatra,
S. Africa); June 7, 21h24m, SAO 184820, 8.8 (India, S. Africa);
June 8, 3h29m, SAO 184783, 7.6 (S. Africa, Antarctica); June 17,
10h56m, SAO 207253, 8.4 (Antarctica).
     Total visual magnitude estimates (cf. IAUC 4993):  Apr. 16.41
UT, 4.7 (E. Jacobson, Evansville, MN, 10x50 binoculars); 17.41,
4.7 (Jacobson); 18.14, 5.1 (J. D. Shanklin, Cambridge, England,
20x80 binoculars; 40' tail in p.a. 355 deg).


1990 April 18                  (4997)             Daniel W. E. Green

Read IAUC 4996 SEARCH Read IAUC 4998

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

Valid HTML 4.01!