[vsnet-alert 8460] Absolute photometry of Nova Aquilae 2005 and some comparison stars

[Richard Miles]

Simultaneous photometry in V and I [relative to 5 Hipparcos stars in V-band (93565, 93606, 93744, 93797, 93856), 3 Hipparcos stars in I-band(93606, 93744, 93797)] using a photometric aperture of 19 arcsec radius, yield:

V Magnitudes:
-------------------
JD-2450000,  N-Aql-05,  'Star 110',  Star '116',  Star '123'
3535.4498,  11.217,  10.971,  11.586,  12.153
3535.4537,  11.212, 10.961,  11.604,  12.162
3535.4577,  11.220,  10.961,  11.616,  12.207
3535.4616,  11.217,  10.987,  11.603,  12.186
3535.4656,  11.211,  10.975,  11.599,  12.199

Mean / St. Error at JD 2453535.4577
N-Aql-05,  11.215  /  0.002
'Star 110',  10.971  /  0.005
Star '116',  11.602  /  0.005
Star '123',  12.182  /  0.010


V-I Colour Indices:
-------------------------
JD-2450000,  N-Aql-05,  'Star 110',  Star '116',  Star '123'
3535.4498,  3.120,  0.928,  0.920,  1.238
3535.4537,  3.115, 0.926,  0.969,  1.242
3535.4577,  3.136,  0.902,  0.949,  1.312
3535.4616,  3.139,  0.934,  0.961,  1.307
3535.4656,  3.132,  0.914,  0.958,  1.276

Mean / St. Error at JD 2453535.4577
N-Aql-05,  3.128  /  0.005
'Star 110',  0.921  /  0.006
Star '116',  0.951  /  0.009
Star '123',  1.275  /  0.015

Note that Star '123' is slightly brighter than indicated by ASAS-3 V photometry.

Richard Miles
Golden Hill Obs.