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for the first time the analogous phenomenon for comet 10P/Tempel 2.
2
,
3
Later on the authors did show that this phenomenon of cometary outburst
activity is typical for all comets.
4
Unfortunately, post-perihelion light curve can be constructed only for
comet's return on 1983. For that only 24 visual brightness estimations
have been used. Due to bad conditions of observations for other comet's
returns sucient observations are absent. Therefore, post-perihelion bright-
ness behavior of comet 9P can be not studied in detail.
3.2.
Photometrical parameters
The values of the photometrical parameters
H
0
,
n
,and
H
10
were collected
in Table 1. Authors have determined the values of all photometrical param-
eters for comet's returns on 1972, 1983, 1994, and 2005. For other comet's
returns these parameters were taken from Refs. 5-8.
3.3.
Secular brightness variations
The secular fading of comet 9P is important for possible influence of artifi-
cial impact to the nucleus of comet and for cometary photometrical evolu-
tion. The change of absolute magnitude
H
10
is presented in Fig. 2, which
is constructed on the basis of data, presented in Table 1. From these data
the mean fading of comet was calculated to be 0
.
0060
m
foryearorabout
Table 1.
Photometrical parameters of comet 9P/Tempel 1 at all apparitions.
Apparition
H
0
n
H
10
Notes
Reference
8.4
m
1867 II
—
—
—
5
1873 I
—
—
9.2
—
5
1879 III
—
—
10.4
—
5
1972 V
—
—
12.0
±
0.1
—
6
10
.
57
m
±
0
.
35
m
3.00
±
0.64
9.75
±
0.09
Pre Per
This paper
1978 II
—
—
13.94
—
7
1983 XI
5.36
±
0.15
—
8.61
±
0.03
All
8
5.82
±
0.26
9.04
±
0.50
8.47
±
0.06
All
This paper
5.30
±
0.16
10.02
±
0.28
8.64
±
0.03
Pre Per
8
5.96
±
0.28
8.82
±
0.51
8.55
±
0.07
Pre Per
This paper
7.86
±
3.06
10.16
±
0.29
8.25
±
0.15
Post Per
8
5.99
±
1.41
8.36
±
3.02
8.01
±
0.14
Post Per
This paper
1994
5.23
±
0.19
10.41
±
0.35
8.62
±
0.06
Pre Per
This paper
2005
7.19
±
0.42
8.05
±
0.71
9.37
±
0.08
Pre Per
This paper
