Norwegian Astronomical Society - Variable Star Section ***** Sequence for V1494 Aquilae (Nova 1999) ***** [Compiled by Bjorn H. Granslo, last update 1999 Dec 4] Here follows a list of comparison stars for this bright nova, discovered visually by Alfredo Pereira, Cabo da Roca, Portugal, on 1999 Dec 1.785 UT. --------------------------------------------------------------- 1918+04 V1494 Aquilae (Nova Aql 1999 No. 2) R.A. = 19h23m05s.4, Decl. = +04o57'20" (2000.0) Type: NA? Magnitude: 3.9 v - 16 R. Spectrum: Pec(N) ID Star name R.A. (2000.0) Decl. V-mag B-V Sp Ref h m s o ' " A Zeta Aql 19 05 24.6 +13 51 48 2.99 +0.01 A0 HIP B Delta Aql 19 25 29.9 +03 06 53 3.36 +0.32 F0 HIP C Beta Aql 19 55 18.8 +06 24 24 3.71 +0.86 G8 HIP D Epsilon Aql 18 59 37.4 +15 04 06 4.02 +1.08 K0 HIP E Iota Aql 19 36 43.3 -01 17 12 4.36 -0.08 B5 HIP F Mu Aql 19 34 05.4 +07 22 44 4.45 +1.18 K3 HIP G Nu Aql 19 26 31.1 +00 20 19 4.64 +0.58 F2 HIP H 19 Aql 19 08 59.9 +06 04 24 5.23 +0.35 F0 HIP J 22 Aql 19 16 31.0 +04 50 05 5.59 +0.10 A3 HIP K 45 Aql 19 40 43.3 -00 37 16 5.64 +0.12 A3 HIP L Upsilon Aql 19 45 40.0 +07 36 47 5.89 +0.18 A3 HIP M 24 Aql 19 18 50.9 +00 20 20 6.40 +1.05 K0 HIP 1 HIP 95680 19 27 41.1 +04 42 35 6.73 +0.37 F0 HIP 2 HIP 95045 19 20 19.5 +04 46 40 7.04 +0.14 A2 HIP 3 HIP 95401 19 24 23.0 +05 33 52 7.77 +0.62 G0 HIP 4 HIP 95026 19 20 06.2 +04 28 50 7.93 +1.04 K0 HIP 5 TYC 0472-0641 19 21 21.8 +05 07 23 8.40 +0.21 .. TYC 6 TYC 0473-5917 19 23 03.3 +04 36 52 8.66 +0.88 .. TYC 7 TYC 0473-3097 19 23 33.6 +05 23 14 8.98 +0.37 .. TYC 8 TYC 0473-5044 19 24 57.1 +04 10 39 9.19 +0.62 .. TYC 9 TYC 0472-1241 19 21 54.1 +05 06 45 9.83 +0.56 .. TYC 10 TYC 0473-3683 19 23 07.0 +05 06 14 10.11 +0.27 .. TYC --------------------------------------------------------------- The brighter comparison stars were selected by Guy M. Hurst, and identifications (ID) of these stars are taken from TA E-Circular No. 1475 (letters A-M); the fainter stars (numbers 1-10) were selected by undersigned. Positions, V magnitudes B-V colours, and spectral types are from the Hipparcos (HIP) or Tycho (TYC) catalogues. The accuracies of V and B-V are generelly ranging from 0.01 mag. for the brighter stars to 0.05 mag. for the 10th magnitude objects. Some of the stars in the table are possibly slightly variable, but this should not affect visual observations. It is important to point out that visual brightness estimates differs more or less from V and other instrumental magnitudes. This is mainly due to differences in spectral responses between the eye and the defined magnitude system and the effects of the atmosphere (visual observations are generelly not corrected for extinction). Observations should therefore be reported in full. Yours sincerely, Bjorn H. Granslo [Director, NAS.VSS]