2 Description of photometric observations

Below we give the full names of observatories where observations were made. The abbreviations of the observatory names, which we use hereafter for the sake of brevity, are printed in boldface.

• Alma-Ata. Observatory of the Fesenkov Astrophysical Institute of the Academy of Sciences of the Republic of Kazakhstan, Kazakhstan. Located in Almaty;

• Voronezh. Observatory of Voronezh State University, Voronezh, Russia. Located in Voronezh;

• Dushak. Observing station of the Astronomical Observatory of the Odessa State University, Odessa, Ukraine. Located on Mt. Dushak-Erekdag in Turkmenistan;

• Kiev. Main Astronomical Observatory of the Ukrainian Academy of Science, Kiev, Ukraine. Located in Golosyivo near Kyiv;

• Kourovka. Kourovka observatory of Ural state university, Ekaterinburg, Russia. Located in Kourovka near Ekaterinburg;

• Nauchny. Observatory of the Crimean Laboratory of the Sternberg Astronomical Institute, Moscow State University, Moscow, Russia. Located in settlement Nauchnyi, Crimea Ukraine;

• Pulkovo. Main Astronomical Observatory of the Russian Academy of Sciences, S.-Petersburg, Russia. Located in Pulkovo.

Table 1 below lists the observers who took part in observations at each observatory and a brief description of the equipment used. A separate column gives the adopted codes used of actual observers. These codes will then be used to identify the observatory, observers, and equipment for each observation. The observations were made with different instruments at some observatories and therefore the latter are listed twice in Table 1.

 

 

Table 1: List of observers and parameters of the equipment

		Altitude
Code	Observatory	above the	Instrument	Detector	Observers
		sea level, m
a	Alma-Ata	1450	Zeiss-600, D = 60 cm, F = 12381 mm	CCD ST-6	Tejfel V.G.
v	Voronezh	195	Refractor, D = 6 cm, F = 300 mm	Visual	Berejnoi A.A.
w	Voronezh	195	Reflector, D =10 cm, F = 800 mm	Visual	Berejnoi A.A.,
					Raskhozhev V.N.
d	Dushak	1000	Reflector, D = 80 cm, F = 11000 mm	Photometer	Dorokhova T.N.,
					Dorokhov N.I.,
					Mukhamednazarov S.
l	Kiev	188	AZT-2, D = 70 cm, F = 10500 mm	Analog TV	Delets A., Kucherov V.,
				photometer	Ledovskaya I.
g	Kourovka	200	AZT-3, D = 45 cm, F = 10000 mm	Photometer	Gorda S.Yu.
t	Nauchny	550	Zeiss-600, D = 60 cm, F = 7500 mm	Photometer	Irsmambetova T.R.
e	Nauchny	550	Refractor, D = 40 cm, F = 1600 mm	CCD ST-8	Esipov V.F.
k	Pulkovo	75	Refractor, D = 60 cm, F = 10400 mm	CCD ST-6	Kisselev A.A.,
					Izmailov I.S.

Remark in Table 1: One of the photoelectric observations at the observatory in Nauchnyi settlement was made with the participation of S.Yu. Shugarov, observer from the Sternberg Astronomical Institute.

The observations at the observatories Dushak, Kiev, Kourovka, Nauchny (Code t) were made with an electrophotometer in a photon-counting mode.

We observed mutual phenomena of the four Galilean satellites. Table 2 lists some of the parameters of the satellites and the elements of their orbits at the time close to the Jupiter opposition.

 

 

Table 2: Some of the satellite parameters for August 9, 1997

Satelligte	Magnitude	Radius, km	Apparent radius, ''	Apparent radius of the orbit, ''	Orbital period, days
Io	4.88	1816	0.618	143	1.769138
Europa	5.15	1563	0.532	228	3.551181
Ganimede	4.47	2638	0.898	364	7.154553
Callisto	5.51	2410	0.821	641	16.68902

The season of mutual phenomena of Jovian satellites at observatories in Russia, Ukraine, and Kazakhstan started on March 12, 1997 and ended on January 26, 1998.

During the season of the mutual occultations and eclipses the Jupiter declination varied from -14 to -18 degrees.