Deneb (α Cygni) - The brightest star of the constellation, which, together with Vega in Lyra to the west and Altair in Aquila to the south, forms the Summer Triangle. This bright blue-white supergiant (1.2 mag) is much farther away than other bright stars in our sky - it is located at a distance of 2600 light-years. In order for Deneb to be so bright from this distance, it must have a greater energy output than 60,000 Suns, making it one of the most luminous stars visible to the naked eye (for example, Vega is 25 light-years away from us and Altair is only 11 light-years away). Its mass is 19 times that of the Sun and its diameter is 203 times larger. The surface temperature reaches 8500K.

Sadr (γ Cygni) - The star has a companion with a magnitude of 9.9 at a separation of 142" that can be seen using a telescope with a 6 cm diameter objective. It itself is also a close binary star. Its distance from Earth is estimated to be 1800 light-years, so its luminosity is therefore 33,000 times greater than that of the Sun.

δ Cygni - Binary star, with component magnitudes reaching values of 2.9 and 6.3, their separation is 2.4" and the distance from Earth is 124 light-years. It is a good test for a 10-15 cm telescope. The primary component is reported by observers as white, pale blue, or even blue-green, while the secondary appears pale blue to blue.

Albireo (β Cygni) - It forms the head of the Swan or the bottom of the Cross and is one of the most beautiful contrasting double stars. Because it is not possible to directly observe the weaker star orbiting the brighter one, it cannot be said with certainty that it is a physical double star. The system is approximately 400 light-years away. The primary component is 950 times and the secondary component is 230 times brighter than the Sun.

χ Cygni - At its maximum of 3rd to 5th magnitude, this long-period variable star is located in the southwest part of the constellation visible to the naked eye, while in 6 to 7 months or up to 406 days it reaches a minimum around 13th to 14th magnitude. After the Mira Ceti itself, it is the brightest star of this type. A suitable comparison star is η Cygni (3.89 mag).

61 Cygni - The inconspicuous binary star, distinguishable even with a smaller telescope, is known for being the first one to have its trigonometric parallax measured in 1838 - the distance of this celestial object was determined by the German astronomer Friedrich Wilhelm Bessel (who mainly worked in astrometry - he accurately measured the positions of over 50,000 stars and based on the analysis of their irregular proper motions, he predicted the presence of their long-invisible companions for both Sirius and Procyon in 1844).

Cygnus X-1 - A binary star near η Cygni. It is a variable source of X-ray radiation. One component is visible, the other is not visible, but X-rays are emitted from its surroundings. The visible star is a luminous giant, the invisible component is likely a collapsed old star with a large mass - a black hole with a radius of only 10 km, which draws a huge amount of gas from the luminous giant (with a radius of 10 million km) and emits extremely intense X-ray radiation before it reaches its boundary, emitting X-rays.

SS Cygni - One of the many variable stars is a cataclysmic variable star, which flares up to a brightness of 8mag every 2 months, but normally it is a 12mag star. It is the prototype of dwarf stars known either as SS Cygni-type variable stars or U Geminorum-type variable stars.