Sinoć (16.04.2016) sam snimao sa dslr aparatom (Canon 650D) i običnim tele objektivom (Sigma 18-250mm) na običnom postolju (stativ Koenig), sa balkona (Sarajevo, Ilidza). Htio sam da vidim mogu li uhvatiti detalje Mjeseca, Jupiter i njegove satelite, kao i neke poznatije binarne zvjezdane sisteme. Ovo moze uraditi svako sa bilo kojim dslr aparatom, objektivom sa fokusom većim od 200mm i nekim stativom (postoljem).
Na moje iznenađenje, uspio sam uraditi sve ovo, i to za relativno kratko vrijeme jer su ekspozicije kratke i nema obrade slika. Budući da nisam mogao pratiti rotaciju Zemlje, ekspozicije su bile vrlo kratke – oko 1sec, blendu sam otvorio na maksimum za dati objektiv i fokus (f/6.3), M mode, Raw format, ISO 800-1600. Uz pomoć softvera dslr controller i tableta (android sistem) sam fokusirao objekte. Slike, naravno, nisu spektakularne kao sa motorizivanim postoljem i vođenjem teleskopa, ali s obzirom na ograničenja u opremi prijatno sam iznenađen.
Mjesec (krop slike)
Jupiter i njegovi sateliti (krop slike)
A na slici dole prikazan je raspored tih satelita u dato vrijeme (Java aplet).
Binarni sistem Sirius (krop slike)
Evo šta wikipedija kaze o Siriusu:
“Sirius is the brightest star (in fact, a star system) in the Earth’s night sky. With a visual apparent magnitude of −1.46, it is almost twice as bright as Canopus, the next brightest star. The name “Sirius” is derived from the Ancient Greek Σείριος (Seirios), meaning “glowing” or “scorcher”. The system has the Bayer designationAlpha Canis Majoris (α CMa). What the naked eye perceives as a single star is actually a binary star system, consisting of a white main-sequence star of spectral type A1V, termed Sirius A, and a faint white dwarf companion of spectral type DA2, called Sirius B. The distance separating Sirius A from its companion varies between 8.2 and 31.5 AU.
Sirius appears bright because of both its intrinsic luminosity and its proximity to Earth. At a distance of 2.6 parsecs(8.6 ly), as determined by the Hipparcos astrometry satellite, the Sirius system is one of Earth’s near neighbors. Sirius is gradually moving closer to the Solar System, so it will slightly increase in brightness over the next 60,000 years. After that time its distance will begin to increase and it will become fainter, but it will continue to be the brightest star in the Earth’s sky for the next 210,000 years.
Sirius A is about twice as massive as the Sun (M☉) and has an absolute visual magnitude of 1.42. It is 25 times more luminous than the Sun but has a significantly lower luminosity than other bright stars such as Canopus or Rigel. The system is between 200 and 300 million years old. It was originally composed of two bright bluish stars. The more massive of these, Sirius B, consumed its resources and became a red giant before shedding its outer layers and collapsing into its current state as a white dwarf around 120 million years ago.
Sirius is also known colloquially as the “Dog Star“, reflecting its prominence in its constellation, Canis Major(Greater Dog). The heliacal rising of Sirius marked the flooding of the Nile in Ancient Egypt and the “dog days” of summer for the ancient Greeks, while to the Polynesians in the Southern Hemisphere the star marked winter and was an important reference for their navigation around the Pacific Ocean.”
Binarni sistem Procyon (krop slike)
“Procyon (α CMi, α Canis Minoris, Alpha Canis Minoris; BrE) is the brightest star in theconstellation Canis Minor. To the naked eye, it appears to be a single star, the eighth brightest in the night sky with a visual apparent magnitude of 0.34. It is classified as a binary star system, consisting of a white main-sequence star of spectral type F5 IV–V, named Procyon A, and a faint white dwarf companion of spectral type DQZ, named Procyon B.
The reason for its brightness is not its intrinsic luminosity but its relative closeness to the Sun. As determined by the European Space Agency Hipparcos astrometry satellite, it lies at a distance of just 11.46 light-years (3.51 parsecs), and is therefore one of our nearest stellar neighbours. Its closest neighboring star is Luyten’s Star, about 1.12 ly (0.34 pc) away, and the latter would appear as a visual magnitude 2.7 star in the night sky of a hypothetical planet orbiting Procyon.”
Binarni sistem Spica (krop slike)
“Spica (α Vir, α Virginis, Alpha Virginis) is the brightest star in the constellation Virgo, and the 15th brightest star in the night sky. Located 250 ± 10 light years from Earth, it is actually a spectroscopic binary and rotating ellipsoidal variable—a system whose two main stars are so close together they are egg-shaped rather than spherical, and can only be separated by their spectrum. The primary is a blue giant and a variable star of the Beta Cephei type.”