154  NS PERSEI   (UG)   Range: 14.3-18.0V
     Position:   04 18 44.42  +51 07 31.4 (J2000, from .dat file)
     Magnitude:  V=17.954  B-V=0.992      (single night)

ID     RA  (2000)   DEC       X    Y   N    V      ERR     B-V    ERR 
  
a) Comparison star sequence
  
1    04 18 40.6  +51 07 30   -36   -1  3  11.661  0.095   0.499  0.033   
2    04 19 08.4  +51 12 07   225  276  3  12.352  0.037   0.521  0.046   
3    04 18 38.8  +51 12 48   -53  317  3  12.981  0.005   0.495  0.015   
4    04 18 39.4  +51 04 09   -47 -202  3  13.572  0.005   0.869  0.024   
5    04 19 01.5  +51 04 02   161 -209  3  13.875  0.000   0.732  0.026   
6    04 18 20.8  +51 08 17  -222   46  3  14.108  0.008   0.720  0.023   
7    04 18 38.3  +51 11 12   -57  221  3  14.830  0.008   0.887  0.020   
9    04 19 08.2  +51 06 00   224  -91  3  15.104  0.000   0.687  0.028   
10   04 18 35.6  +51 07 01   -83  -30  3  15.518  0.009   0.836  0.025   
11   04 18 50.9  +51 06 59    61  -32  3  16.179  0.006   0.911  0.037   
12   04 18 34.2  +51 08 18   -96   47  3  16.862  0.019   1.076  0.055   
13   04 18 32.4  +51 07 35  -113    4  2  17.473  0.011   1.236  0.006   


b) Wide-colour extension for CCD calibration

     04 18 14.9  +51 07 14  -278  -17  3  11.613  0.081   0.412  0.009   
     04 18 32.9  +51 14 04  -108  393  3  12.731  0.005   0.421  0.019   
     04 19 01.1  +51 06 51   157  -40  3  14.793  0.010   1.812  0.027   
     04 18 19.8  +51 08 49  -231   78  3  14.808  0.005   1.859  0.026   
     04 18 29.3  +51 03 43  -143 -228  3  15.709  0.009   2.116  0.037   


Notes:

1. NS Per was measured on one night at an intermediate magnitude of V=15.879
and B-V=0.371, fairly typically blue for a dwarf nova. However in quiescence
the variable becomes considerable red, and at minimum with V=17.954 it had 
reddened to B-V=0.992. 

2. NS Per appears to Fluctuates between V=17.7 and V=18.0 at minimum.


Bruce Sumner 
16 November 1999