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Date: Sat, 21 Aug 1993 21:51:45 +0300
From: granslo@argo.uio.no
Subject: Observations of IP Pegasi
***** PHOTOMETRIC OBSERVATIONS OF 2318+17 IP PEGASI *****
The dwarf nova IP Pegasi is currently in outburst. It was first reported in
outburst by the Belgian observer Paul Van Cauteren on August 19 22h 48m U.T.
This is an interesting system as it shows eclipses during maxima. The only
other northern dwarf nova with this behaviour is HT Cassiopeiae. Observers
are encouraged to monitor this system in order to detect and describe the
behaviour of the eclipses. Measurements with photoelectric photometers and
CCD cameras are especially welcome. The orbital period of the system is
3h 48m. The following observations indicate that no eclipses have yet been
detected:
YYYY MM DD.DDD MAGN MS ACCU SEQ PHASE INSTRUMENT OBSERVER
1993 08 18.938 <13.8 mv 0.608 M400 Poyner, G.
1993 08 19.017 <14.0 mv AC 0.107 C203, 222x Granslo, B. H.
1993 08 19.950 13.4 mv 0.000 Van Cauteren, P.
1993 08 19.963 13.5 mv 0.082 Vanmunster, T.
1993 08 20.105 12.7 mv 0.979 C203 Schmeer, P.
1993 08 20.89 12.4 mv 0.94 C203 Westlund, M.
1993 08 20.913 13.3 mv 0.082 M400 Poyner, G.
1993 08 20.941 13.2 mv 0.259 M400 Poyner, G.
1993 08 20.966 13.3 mv 0.2 AC 0.417 C203, 222x Granslo, B. H.
1993 08 20.976 13.1 mv 0.2 AC 0.480 C203, 222x Granslo, B. H.
1993 08 20.988 13.1 mv 0.2 AC 0.556 C203, 222x Granslo, B. H.
1993 08 20.997 13.0 mv 0.2 AC 0.613 C203, 222x Granslo, B. H.
1993 08 21.012 13.1 mv 0.2 AC 0.707 C203, 222x Granslo, B. H.
1993 08 21.023 13.0 mv 0.2 AC 0.777 C203, 222x Granslo, B. H.
1993 08 21.033 12.9 mv 0.2 AC 0.840 C203, 222x Granslo, B. H.
1993 08 21.047 13.0 mv 0.2 AC 0.928 C203, 222x Granslo, B. H.
1993 08 21.058 12.9 mv 0.2 AC 0.998 C203, 222x Granslo, B. H.
1993 08 21.072 13.1 mv 0.2 AC 0.086 C203, 222x Granslo, B. H.
1993 08 21.084 13.1 mv 0.2 AC 0.162 C203, 222x Granslo, B. H.
Time system are in Universal Time. Magnitude systems (MV): mv = visual.
ACCU = estimated accuracy of observation in magnitudes. Instruments
(apertures in mm): M = reflector, C = Schmidt-Cassegrain. Sequence (SEQ):
AC = AAVSO chart. The phase has been calculated from
J.D. - 244 9199.5
PHASE = FRAC [-----------------]
3.80 / 24
where FRAC denotes the fractional part of the expression.
The times of mid eclipses do probably occur between phases 0.259 and 0.417.
Bjorn H. Granslo
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