Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 4636: 1988j; R CrB

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 4635 SEARCH Read IAUC 4637
IAUC number 

                                                  Circular No. 4636
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
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


COMET MACHHOLZ (1988j)
     Donald E. Machholz reports the visual discovery with 27x120
binoculars of his fourth comet.  The following observations
are available:

   1988 UT        R.A. (1950)  Decl.      m1      Observer
   Aug.  6.470    4h41.3     + 0 39'     8.6      Machholz
         7.47     4 46.7     + 0 35      9.6      Morris
         7.479    4 46.9     + 0 29      8.6      Machholz
         7.486    4 46.8     + 0 35      8.7      Levy
         8.472    4 52.8     + 0 33      8.6        "
         8.484    4 53.1     + 0 30      8.6      Machholz

D. E. Machholz (Loma Prieta, CA).  Comet diffuse with some
   condensation.  Coma diameter 3'-5'.
C. S. Morris (near Mt. Wilson, CA).  0.26-m reflector; coma diameter
   3.7'.  In 20x80 binoculars, m1 = 9.3, coma diameter 5.6'.
D. Levy (Tucson, AZ).  0.41-m reflector; comet diffuse with slight
   condensation; on Aug. 8, 15' tail towards the west.


R CORONAE BOREALIS
     P. L. Cottrell, Mount Stromlo Observatory; and W. Lawson,
Mount John University Observatory, write:  "We have obtained high
resolution (< 0.1 nm) spectra, in a few wavelength intervals, of R
CrB as it has gone into its current decline (cf. IAUC 4633).
Spectra were obtained on the following dates:  June 16, 20, 22,
24, July 5, 13, 23, 25, 28, 29, 30, 31, and Aug. 1 and 2.  Up until
about July 23 (about 0.8 mag below maximum light) there was little
change in the spectra we obtained (compared with spectra taken
June 24), although after July 28 there was a rapid development of
the emission lines.  This was especially evident at the Na D lines,
where between July 28 and Aug. 1 these lines went from multiple
component absorption to multiple component (some at velocities of
-150 km/s) emission features."
     Visual magnitude estimates:  July 29.87 UT, 7.6 (J. Ripero,
Madrid, Spain); 31.11, 7.8 (D. Kocyla, Southbury, CT); 31.92, 8.0
(P. Velasco, Madrid, Spain); Aug. 2.04, 8.4 (J. Shanklin, Cambridge,
England); 3.00, 8.5 (R. King, Duluth, MN); 3.95, 9.1 (A. Pereira,
Linda-a-Velha, Portugal); 4.84, 9.2 (E. Schweitzer, Strasbourg,
France); 5.83, 9.3 (A. Boattini, Florence, Italy); 6.95, 9.7 (P.
Schmeer, Bischmisheim, W. Germany).


1988 August 8                  (4636)            Daniel W. E. Green

Read IAUC 4635 SEARCH Read IAUC 4637

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

Valid HTML 4.01!