235  PT PERSEI   (UG)   Range: 15p-18.5V
     Position:   02 42 51.22  +56 41 31.5 (J2000, from .dat file)
     Magnitude:  V=18.487  B-V=0.141      (in .dat file)

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

a) Comparison star sequence

1    02 42 43.9  +56 44 49   -60  197  3  11.915  0.092   0.509  0.007   
2    02 42 15.0  +56 42 30  -298   58  3  12.211  0.055   1.010  0.051   
3    02 43 20.5  +56 38 17   242 -195  3  12.718  0.010   0.670  0.009   
4    02 42 49.1  +56 43 23   -17  111  3  13.404  0.000   0.625  0.011   
5    02 42 56.4  +56 38 14    43 -198  3  13.747  0.009   0.578  0.006   
6    02 42 39.3  +56 40 34   -98  -58  3  14.229  0.013   0.846  0.014   
7    02 42 44.1  +56 41 43   -59   11  3  14.533  0.012   1.024  0.009   
8    02 42 34.5  +56 42 27  -137   55  3  15.023  0.012   1.097  0.011   
9    02 42 40.5  +56 40 03   -88  -89  3  15.648  0.016   1.043  0.002   
10   02 42 40.4  +56 42 46   -89   74  3  16.125  0.013   0.870  0.027   
11   02 42 52.1  +56 42 26     7   54  3  16.613  0.025   1.303  0.041   
12   02 42 52.4  +56 41 25     9   -7  3  17.135  0.000   0.831  0.051   


b) Wide-colour extension for CCD calibration

     02 42 30.4  +56 40 45  -171  -47  3  13.353  0.006   0.645  0.006   
     02 42 08.8  +56 44 18  -349  166  3  13.186  0.010   1.343  0.019   
     02 42 22.9  +56 39 20  -233 -132  3  13.669  0.016   1.928  0.031   


Notes:

1. Stars #1 and #2 are saturated and their magnitiudes and colurs should be
used for guidance only.

2. There are three bright Tycho-2 stars with reliable magnitudes:

      02h 42m 15.4s +56d 33' 56"  V= 8.63+/-0.01
      02h 43m 08.8s +56d 42' 42"  V=10.18+/-0.03
      02h 42m 19.2s +56d 45' 20"  V=10.55+/-0.04

3. The bright Tycho-2 star with V=8.63 is also known as NSV 15561.

4. There is a very faint companion about 3 arcsec northwest of PT Per
with a magnitude of about 19.5.


Bruce Sumner
22 October 2001
Revised 3 March 2002