[vsnet-chat 228] visibility of omicron Cet

[Taichi Kato <tkato>]

   Thanks to Stan Walker's reply to my question about the seasonal visibility
of Mira (omicron Cet).  I have picked up from the VSOLJ record the first
and last observations of the recent 20 observing seasons.

   first observation      last observation
-----------------------------------------------
(no input)              1975 03 31   3.6 Sem
1975 07 17   7.4 Sem    1976 03 22   6.0 Num
1976 07 21   8.5 Ioh    1977 03 21   5.5 Mze
1977 07 13   8.8 Num    1978 03 11   5.5 Sms
1978 07 04   9.2 Num    1979 03 21   8.4 Num
1979 07 24   9.2 Num    1980 03 15   8.2 Num
(no input)              1981 03 16   8.9 Num
1981 07 10   6.8 Num    1982 03 13   8.8 Num
1982 06 29   2.7 Num    1983 03 11   9.7 Num
1983 07 06   3.7 Yad    1984 03 20   8.7 Num
1984 06 27   4.1 Num    1985 03 26   4.7 Yad
1985 06 17   4.5 Yad    1986 03 25   3.5 Yad
1986 07 07   7.8 Yad    1987 03 26   4.1 Num
1987 06 25   7.8 Num    1988 03 10   5.7 Hsk
1988 08 05   9.1 Wnt    1989 03 15   6.9 Num
1989 07 22   8.7 Wnt    1990 03 21   7.9 Yad
1990 07 13   8.8 Num    1991 03 13   8.6 Num
1991 07 22   5.3 Num    1992 03 07   8.0 Tut
1992 07 18   2.3 Yad    1993 03 13   8.8 Num
1993 07 23   4.3 Yad    1994 03 14   8.2 Num
1995 07 01   4.2 Hrm

   The earliest (seasonal) observation was done on June 17, 1985 and last
one on Mar. 31, 1975.  The (nominal) interval between them 78 days = 11
weeks.  Compared to Stan Walker's value, the gap of visibility from the
north is twice longer than from the south.  The analysis clearly solved our
frequently asked (at least here) question: "Can I observe Mira all year
if I travel to the south?".  I can now safely recommend our northern observers
to observe objects south of -30 degree when they travel to the south.

Regards,
Taichi Kato

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