I have prepared a preliminary BVRI sequence for Nova Aquilae 2001 from Arne's single night field photometry. The sequence closely follows that chosen by Bouma [vsnetalert 5917] but I have extended it to fainter magnitudes. These will be revised as additional photometry becomes available. As Arne noted the magnitudes are accurate to about +/-0.02 magnitude. Bruce Sumner ----------------------------- 221 NOVA AQUILAE 2001 (N) Range: 10.8p19.6B Position: 19 07 28.39 +11 44 46.0 (J2000, from .dat file) Magnitude: V=13.337 BV=1.765 (Henden, single night) ID RA (2000) DEC X Y N V BV VR RI 1 19 07 23.9 +11 43 34 67 72 1 10.437 0.401 0.463 0.271 2 19 07 18.3 +11 49 02 148 256 1 11.052 0.576 0.332 0.356 3 19 07 47.1 +11 43 28 275 78 1 11.523 1.001 0.545 0.519 4 19 07 27.1 +11 42 17 19 149 1 12.221 1.010 0.577 0.592 5 19 07 12.5 +11 42 33 234 133 1 12.498 0.735 0.412 0.440 6 19 07 41.2 +11 46 03 187 77 1 13.127 1.010 0.577 0.592 7 19 07 43.2 +11 42 19 217 147 1 13.667 1.035 0.623 0.663 8 19 07 43.5 +11 46 17 222 91 1 13.774 1.030 0.613 0.669 9 19 07 39.4 +11 49 25 161 279 1 13.990 1.005 0.620 0.702 10 19 07 29.3 +11 41 46 14 180 1 14.157 0.937 0.557 0.564 11 19 07 31.9 +11 43 35 52 71 1 14.413 1.002 0.577 0.601 12 19 07 37.4 +11 47 06 132 140 1 14.608 1.083 0.676 0.696 13 19 07 17.9 +11 43 55 155 51 1 15.078 1.023 0.591 0.622 14 19 07 32.1 +11 44 56 54 10 1 15.366 1.307 0.723 0.720 15 19 07 28.4 +11 43 52 0 54 1 15.840 1.160 0.686 0.615 16 19 07 29.6 +11 44 07 17 39 1 16.836 1.542 0.913 0.923 Notes: 1. This preliminary sequence is based on field photometry obtained by Arne Henden on the single night of 22 May 2001. Errors are expected to be of the order of +/0.02 magnitude. 2. I have attempted to use stars of similar colour in this sequence to help observers estimate the magnitude of this red nova. This explains why the sequence stars generally have a colour as close as possible to BV=1.0. 3. Star #1 is saturated. It does have a reliable Tycho2 magnitude of 10.29+/0.04. Bruce Sumner 23 May 2001