PERSEUS
(April schedule and October schedule)

     Perseus constellation is winter constellation and it is in best position for evening observing in December and January when it is high on the sky right over our heads at the zenith.
     In October is rising and is visible low on the northeastern sky, in November is high on the eastern sky, in December and January is in best position for evening observing and it is at the zenith, in February it is high on the northwestern sky, in March it is on the northwestern sky and in April it is very low on the northwestern sky and ready to set behind the horizon. Small portion of the northern part of this constellation never sets behind the horizon.
     We will observe it in April early in the evening when it is very low on the northwestern sky and try to catch it before it sets behind the horizon and also we will observe it in the evenings of October on the northeastern sky when it is rising and climbs enough high over the horizon.

Double and multiple stars

     Eta Perseus - Its name is Miram. Its visual magnitude is 3.8. It is orange supergiant star about 1,300 light years away from the Earth. Its diameter is over 200 times bigger than the diameter of our Sun and its surface temperature is about 4,000 K. Its mass is several Sun masses.
     The companion is star with a visual magnitude 8.5 and is separated by 28 arc seconds on the sky from the 3.8 magnitude star. Most likely it is only visual companion and not a true companion.

Deep sky objects
(can be observed only from dark location outside of the city)

     NGC 891 - It is a galaxy in Andromeda constellation. It is spiral galaxy but positioned edge-on towards our line of sight and thus it appears on the sky like a line. Its visual magnitude is 11.0 and it lies about 30 million light years away. There is a prominent dark dust line which goes along the galaxy and gives impression as the galaxy is divided on half by this line. Its size is about the same as our galaxy, the Milky Way.
     NGC 891 is member of the NGC 1023 Group of galaxies. It is a small group of galaxies where NGC 1023 galaxy is dominant member and this small group of galaxies NGC 1023 Group is part of the Virgo Supercluster of galaxies. Virgo Supercluster is our local supercluster of galaxies. Sometimes also it is called the Local Supercluster. It is a large concentration of galaxies and it includes about 100 galaxy groups and clusters inside its borders and its size is about 100 million light years in diameter. The most prominent member of the Local Supercluster is the Virgo Cluster of galaxies. Its other members are smaller clusters and galaxy groups. Its member is also the so-called Local Group of galaxies or the Local Group. The Local Group is group of galaxies which member is also our own galaxy, the Milky Way. Other members of the Local Group are our closest neigbouring galaxies - Andromeda galaxy, Triangulum Galaxy and about 30 smaller and dwarf galaxies. The Virgo Cluster is located in the heart of Virgo Supercluster and here in the heart the concentration of the galaxies is the highest. It decreases towards the edges of the supercluster. Our Local Group of galaxies is located close to the edge of the Local Supercluster. Our Local Supercluster is small and poor supercluster compared to other superclusters in the universe. It contains one rich galaxy cluster in its heart (The Virgo Cluster of galaxies) and around it chains of galaxies and poor groups of galaxies including our Local Group close to the edge. Our Local Supercluster is one of the millions superclusters in our known universe.
     All galaxies which we will observe on the sky belongs to our Local Supercluster. We will observe those which are among the brightest and the largest ones. Galaxies from other superclusters of galaxies appear in a telescope dim and small.
     M 34 - It is an open cluster of stars with visual magnitude 5.5 and about 1,500 light years away from the Earth. Its diameter is about 15 light years. It is about 250 million years old. The cluster contains about 20 white dwarfs.
     NGC 1245 - It is an open cluster of stars with visual magnitude 8.4 and about 8,000 light years away from the Earth. It is about one billion years old.
     NGC 869 and NGC 884 - These are two open clusters of stars close to each other apparently on the sky and they are called the Double Cluster in Perseus or simply the Double Cluster. Their visual magnitudes are 3.7 and  3.8. Both are visible with naked eyes and are one of the most beautiful objects to observe on the sky. They are about 7,000 light years away from the Earth and are separated on the sky about 30 arc minutes, or in reality in the space they are separated by several hundreds light years. NGC 869 is the one that contains more stars and in a telescope appears a bit more beautiful. They are about 12 million years old.
     NGC 1528 - It is an open cluster of stars with visual magnitude 6.4. It is about 2,500 light years away from the Earth and about 400 million years old. 
     M 76 - It is a planetary nebula. Its name is the Little Dumbbell Nebula. Its visual magnitude is 10.1 and its distance from the Earth is about 2,500 light years. Its true diameter is about 1.5 light years. The central star (planetary nebula nucleus) has visual magnitude 16.0. The surface temperature of the nucleus - the white dwarf is about 90,000 K.