CORVUS
(April schedule and May schedule)

     Corvus constellation is spring constellation and is in best position for evening observing in May when it is low on the southern sky.
     In March it is rising on the southeastern sky, in April climbs on the southeastern sky, in May it is in best position for evening observing when it is relatively low on the southern sky and in June is setting behind the southwestern horizon.
     We will observe it in April when it is relatively low on the southeastern sky and in May when it is a bit higher on the southern sky and in best position for evening observing.

Double and multiple stars

     Delta Corvi - Its name is Algorab. Its components have visual magnitudes 3.0 and 9.2. Its distance is about 100 light years from the Earth. 
     The main component with visual magnitude 3.5 is probably a main sequence star which has recently started expanding towards subgiant because it has used its core hydrogen so the fusion process has moved  to the regions outside of the core. It is about 3 times the mass of the Sun and with surface temperature about 10,000 K giving the star blue-white color. 
     The companion with visual magnitude 9.2 is an orange dwarf star still on the main sequence, giving good color contrast when observed together with the main blue-white component. They are separated on the sky about 25 arc seconds. That means that if the companion is true and not only visual, is orbiting the main component at a quite distance of about 100 billion km and needs several thousand years to make one orbit. 

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

     NGC 4361 - It is a planetary nebula. Its visual magnitude is 10.3 and its central star has visual magnitude 13.0 and it is a white dwarf. It is about 4,000 light years away from the Earth.