4.3.1 Physical Nature of Comets
Takeda wrote a series of reviews on the physical nature of comets in the Japanese
magazine Tenkai (The Heavens) in 1927. In it he introduced the contemporary state
of cometary physics with his own criticisms. Among many research problems, he
was particularly interested in the periodic variation of light curves of comets. He
noticed the case of the Brooks comet (1911c), which showed a periodic variation of
7 days, as found by H. E. Lau (Lau 1912). Takeda collected data and drew a light
curve, as shown in Fig. 4.15, where the abscissas are the month and day in 1911, and
the ordinates are the magnitude (H) of the comet, as seen at one astronomical unit
from the Sun (Takeda 1927).
Fig. 4.14 Portrait of
Takeda Shin’ichiro. (Takeda
1940)
Fig. 4.15 Light curve of
Brooks comet 1911c.
(Takeda 1927)
4.3 Takeda Shin’ichiro
95
Takeda wrote a series of reviews on the physical nature of comets in the Japanese
magazine Tenkai (The Heavens) in 1927. In it he introduced the contemporary state
of cometary physics with his own criticisms. Among many research problems, he
was particularly interested in the periodic variation of light curves of comets. He
noticed the case of the Brooks comet (1911c), which showed a periodic variation of
7 days, as found by H. E. Lau (Lau 1912). Takeda collected data and drew a light
curve, as shown in Fig. 4.15, where the abscissas are the month and day in 1911, and
the ordinates are the magnitude (H) of the comet, as seen at one astronomical unit
from the Sun (Takeda 1927).
Fig. 4.14 Portrait of
Takeda Shin’ichiro. (Takeda
1940)
Fig. 4.15 Light curve of
Brooks comet 1911c.
(Takeda 1927)
4.3 Takeda Shin’ichiro
95