COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     NUMBER 475


                                Konkoly Observatory
                                Budapest
                                1970 October 26


  PHOTOELECTRIC OBSERVATIONS OF NOVA SAGITTARII 1969.

        Since its discovery by Welch (IBVS 389), Nova Sgr
1969 has been observed at the Auckland Observatory, N.Z.,
with the 50 cm Zeiss Cassegrain reflector with Mark 1 photometer 
at the f/13.3 focus. The photometer consists of an
EMI 9502 S.A. tube operated at 1600 volts H.T. with a digital
readout and a ten second integration period.
        The comparison star was HD 170704, for which the
following values were found using HD 170279 and HD 170320
from Hogg's sequence (PASP, 75, 194, 1963):

          V = 8.52; B-V = +0.04; U-B = -0.11


                                OBSERVATIONS    

        J.D.              V              B-V             U-B
 
 2 440 485,90           11,24           -0,14           -0,59
          ,94           11,20           -0,14           -0,51
       486,87           11,22           -0,11           -0,55
       491,90           11,30           -0,18           -0,44
       492,01           11,48           -0,18           -0,50
       495,85           11,24           -0,11           -0,52
          ,86           11,34           -0,23           -0,50
          ,88           11,32           -0,11           -0,52
       504,99           11,56           -0,08           -0,55
       505,86           11,65           -0,03           -0,50
       517,87           11,55           +0,02           -0,40
       526,85           11,63           +0,07           -0,31
       527,84           11,70            0,00           -0,40
       531,88           11,81           -0,05           -0,30
       533,85           11,78           -0,05           -0,29
       666,10           11,76:          +0,56:            ...
       711,02           12,96:          +0,75:          +0,13:
       722,00           13,42           +0,62           +0,53
       734,00           13,29           +0,94           +0,38
       750,17           13,29           +0,86           +0,05
       776,97           13,32           +0,15           +0,12
       799,09           14,02:          +0,63:          +0,06:
       800,95           13,66           +0,98           +0,16


        Observations are on the standard UBV system and the
internal accuracy of these should be +0m02, or better, with
the exception of those indicated by a colon where weather
or other factors intervened.
        Candy (IBVS 408) published a photographic magnitude
from a Perth plate. The Nova was also discovered on Bamberg
plates taken at the Mount John University Observatory
(IBVS 452). On the light curve herewith the photographic
magnitudes from IBVS 389 and 408 are shown as crosses; those
from IBVS 452 as open circles and B values from the Auckland
observations as dots. Welch's observation on JD 2440413.93
must have been very close to the maximum. There is a difference 
between his observation on 2440391.96 and that at
Mt. John on 2440395.02. Otherwise the two sets of photographic 
observations are in good agreement.


                       [FIGURE 1]

 VSS, RASNZ
 18 Pooles Road         B. F. BATESON
 GREERTON, TAURANGA.    B.F. MARINO
 NEW ZEALAND            W.S.G. WALKER