51   V1089 SAGITTARII   (UGSS)   Range: 13.8-<17.5V
     Position:   19 08 46.38  -17 21 46.7  (J2000, from .dat file)
     Magnitude:  V=17.519  B-V=0.364       (Henden, single night)

ID     RA  (2000)   DEC       X    Y   N    V      ERR     B-V    ERR 

a) Comparison star sequence
 
1    19 08 57.9  -17 22 53   164  -66  4  11.365  0.174   0.764  0.106   
2    19 08 49.3  -17 20 46    42   61  6  12.035  0.157   1.204  0.163   
3    19 08 56.5  -17 16 24   144  323  3  12.433  0.011   1.637  0.018   
4    19 08 57.0  -17 23 35   152 -108  7  12.915  0.025   1.358  0.041   
5    19 08 45.7  -17 23 45   -11 -118  7  13.712  0.017   1.075  0.013   
6    19 08 47.3  -17 20 24    13   83  7  13.857  0.014   0.676  0.008   
7    19 08 42.2  -17 20 04   -61  103  7  14.735  0.014   1.095  0.013   
8    19 08 50.0  -17 22 28    51  -41  7  15.149  0.014   1.256  0.014   
9    19 08 51.2  -17 21 39    68    8  7  15.280  0.014   0.991  0.012   
10   19 08 48.0  -17 21 38    23    9  7  15.650  0.014   1.102  0.013   
11   19 08 41.5  -17 21 21   -70   26  7  16.186  0.019   0.623  0.012   
12   19 09 10.0  -17 25 58   337 -251  7  16.538  0.041   0.746  0.020   
13   19 08 47.0  -17 21 27     8   20  7  16.884  0.018   0.735  0.014   
14   19 08 46.4  -17 21 47    -1    0  4  17.234  0.004   1.140  0.004 
15   19 08 46.4  -17 21 41     0    6  3  17.651  0.030   0.765  0.041   
16   19 08 46.7  -17 21 56     4   -9  7  18.142  0.029   0.880  0.104   
17   19 08 46.3  -17 21 25    -1   22  5  19.096  0.014   0.945  0.051   


b) Wide-colour extension for CCD calibration

     19 08 29.7  -17 22 37  -238  -50  7  15.673  0.016   0.148  0.011   
     19 09 01.5  -17 23 48   217 -120  2  16.246  0.446   1.763  0.173   
     19 08 46.8  -17 17 30     5  257  7  15.788  1.209   1.790  1.232   


Notes:

1. This variable appears to have a cycle length of about 30 days. 
During some 10 years of Franklin Adams photos during the 1930's and 
1940's no long outbursts were observed, but some 18 short outbursts, 
of 5 days or less duration, were observed. This variable is probably 
a typical UGSS-subtype dwarf nova.

2. This variable has a very close companion of magnitude 17.234V (star 14
of this sequence), located 1.3 arcsec west and 2.2 arcsec south of the
variable, i.e. 2.5" SSW . Under normal circumstances 17.2V would be the 
apparent minimum magnitude for this variable, as it cannot be separated 
from its neighbour when it fades below 17.2V. The variable itself seems 
to be about magnitude V=17.5 at minimum, or maybe slightly fainter. 

3. The magnitude and colour for the close companion was determined from 
four nights data when V1089 Sgr was faint. This value was determined 
independently from the .dat file.

4. There are several bright Tycho-2 stars in this field. One just SW of the 
variable is V=101, another due north of the variable is V=96 and another 
south of the variable is V=101.

5. This variable star was lost until 1998 when it was recovered visually 
by Rod Stubbings. The identification chart in Downes and Shara (1993) is 
incorrect. 


Bruce Sumner
Revised 2 August 1999