Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 2254: N Cyg 1970; 1970d

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 2253 SEARCH Read IAUC 2255
IAUC number 

                                                  Circular No. 2254
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


NOVA CYGNI 1970
     Dr. L. Kohoutek, Hamburg Observatory, Bergedorf, communicates
the following magnitudes (referred to the photoelectric sequence in
NGC 6913), estimated from plates taken with the 80-cm f/3 Schmidt
before the announcement of the nova's discovery:

     1969/70 UT     B       1970 UT          B
     Nov.  5.74    18:      May  24.0217     9.4
     May   2.04    18:      June  9.0178    10.6

On the first two plates the nova is near the limit.  On five other
plates, of limiting magnitude 17.5 to 18.0, taken between August
1969 and April 1970 the prenova is invisible.  On the Palomar Sky
Atlas prints (July 1951, O-288 and O-279) the prenova was identified
as a star of magnitude B = 18.1; it lies 8".6 northwest of a
fainter star of about B = 18.4.  Using the computer program by
Dieckvoss the nova's position was determined to be:

     R.A. = 20h50m46s.364 +/- 0s.009  Decl. = +35o48'02".04 +/- 0".04 (1950)

     Mr. C. Y. Shao, Harvard College Observatory, provides the
following measures, the photographic ones from plates exposed at the
Agassiz station by M. Mattei.  The photoelectric observation, made
under poor sky conditions, is referred to HBV 475 sequence stars.

     1970 UT       mpg      V     B - V
     May  30.263    9.8
     June 15.292          10.95   -0.08
          15.342   10.8


PERIODIC COMET D'ARREST (1970d)
     Mr. T. Urata, Fujikan Center Observatory, Nihondaira, Shimizu,
Shizuoka, writes that he observed this comet visually on June 8.760
UT, using a 20-cm refractor, 50x.  The total visual magnitude was
11, the diameter 3', and there was no central condensation; the
seeing was poor.  Precise positions of this comet are of particular
importance in view of the possibility that a space probe will be
sent to the comet in 1976.


1970 June 18                   (2254)              Brian G. Marsden

Read IAUC 2253 SEARCH Read IAUC 2255

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

Valid HTML 4.01!