Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 2987: HR 1099; AM Her; 1976g

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 2986 SEARCH Read IAUC 2988
IAUC number 

                                                  Circular No. 2987
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS


HR 1099
     H. E. Bond, Louisiana State University, writes that spectrograms
obtained during Oct. 1974-Jan. 1976 show strong Ca II H and K
emission lines and confirm the 2.8-day spectroscopic period (Bopp
1976, Inf. Bull. Variable Stars No. 1113).  Hydrogen Balmer emission
lines were observed on 1975 Nov. 13.27 UT, but they were absent
or very weak the following night and not seen on any other
spectrograms.  Spectroscopic observations during the current season,
to search for a recurrence of this phenomenon and possible correlation
with radio activity (cf. IAUC 2929, 2972), would be desirable.


AM HERCULIS
     S. Tapia, Lunar and Planetary Laboratory, reports that the
linear polarization of this object (cf. IAUC 2984) varies, maximum
phase being given by 1976 Aug. 16.272 UT + (0.128918 +/- 0.000004) E.
In the visual and red the polarization increases from < 0.7 to ~ 5.5
percent and then decreases in a periodic event lasting ~ 20 min.


COMET HARLAN (1976g)
     The following precise positions have been reported:

     1976 UT             R. A. (1950) Decl.        m1    Observer
     May  17.49167    13 13 14.68   +42 46 21.1   14.5   Seki
          17.50556    13 13 13.92   +42 46 11.2            "
          17.51424    13 13 13.57   +42 46 01.0   15     Kojima
          19.53194    13 11 35.97   +42 21 39.1            "
          22.32569    13 09 31.14   +41 45 15            Harlan
          23.98145    13 08 23.31   +41 22 31.5   15.5   Dykes
     June 24.98686    13 02 31.94   +31 24 03.9          South
          26.98937    13 03 08.77   +30 38 49.0   15.0   Waterfield
     July 26.48205    13 23 39.27   +18 21 38.4   14     Urata
          26.48494    13 23 39.35   +18 21 34.1            "

T. Seki (Geisei; correction to IAUC 2958) and N. Kojima (Ishiki).
   From Orient. Astron. Assoc. Comet Bull. No. 131
E. A. Harlan (Lick Observatory).  Measurer R. Gilliland.
M. R. Dykes, R. H. S. South, R. L. Waterfield and J. C. Palmer
   (Woolston Observatory).  Measurer: Waterfield.
T. Urata (JCPM Yakiimo Station).  From Nihondaira Obs. Circ. No. 780.


1976 September 17              (2987)              Brian G. Marsden

Read IAUC 2986 SEARCH Read IAUC 2988

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

Valid HTML 4.01!