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IAUC 2239: N Aql 1970

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IAUC number 

                                                  Circular No. 2239
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 AQUILAE 1970
     Dr. F. M. Stienon, Warner and Swasey Observatory, writes: "A
spectrum was obtained on Apr. 16.396 UT at a dispersion of 193 A/mm.
It is the spectrum of a moderately slow nova about a week after
maximum light.  The expansion velocity is equal to or slightly less
than that of Nova Ser 1970.  The Balmer series of hydrogen and the
H and K lines of Ca II appear in emission, the latter having strong
violet-displaced absorptions.  Other emission features identified
include [0 I] 6300 A, 6363 A; C I 4267 A; Na I D-lines; and Fe II
lines from multiplets 27, 42, 49 and 74.  [N II] 5755 A appears
weakly, masked by a nearby night-sky line."

     Further magnitude estimates have been reported as follows:

     1970 UT      Mag.     Observer   1970 UT      Mag.     Observer
     Apr.  6.14  > 9.5 *   Locher     Apr. 18.71    7.9     Takeishi
          12.76    6.7 **  Fujii           19.35    7.5 v   Sweetsir
          13.78    7.3 **  Kato            20.8     7.4 v   Seki
          14.78    7.0 **  Adachi          21.03    7.8 pg  Grosbol
          18.12    7.5 v   Locher          23.70    8.2     Takeishi

K. Locher (Wetzikon, Switzerland). *Non-appearance on color-reversal
   film.
A. Fujii, H. Kato, K. Adachi and M. Takeishi (Japan).  **Photograph
   with 35-mm camera.  Communicated by A. Kamo.
R. A. Sweetsir (Switzerland, Florida).  High cirrus, bright moon.
T. Seki (Kochi Observatory)
P  Grosbol and B. G. Jorgenson (Copenhagen University Observatory).
   25-cm photographic refractor.  Uncertainty +/- 0.4 magnitude.

   A new reduction of the measurements mentioned on IAUC 2237
yields Decl. = +4o08'50".0 (1950.0).  Mr. Seki sends the following
position: R. A. = 19h22m15s.45, Decl. = +4o08'49".3.  Messrs. Grosbol and
Jorgenson obtain: R. A. = 19h22m15s.40, Decl. = +4o08'48".3 (using Yale
zones), and they have identified the prenova as a star of magnitude
18 +/- 1 on the blue Palomar Sky Survey print; the color index
seems to be slightly negative.  According to C. Y. Shao, Harvard
College Observatory, the prenova does not appear on a single blue
180-min exposure taken with the 61-cm Bruce doublet in August 1935,
even though several fainter stars in its immediate vicinity can be
seen; it is deduced that the prenova varies by at least 1 magnitude.


1970 April 29                  (2239)              Brian G. Marsden

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