γ1,2 Del - A physical binary star, whose components have apparent magnitudes of 4.3 (yellow) and 5.1 (greenish), are separated by 10" in the sky, so they can be resolved even in a 5 cm telescope. The companion may appear bluish in some eyepieces, which is due to the contrast with the yellow primary component.

Sualocin a Rotanev - The two brightest stars of the constellation, α (3.77 mag) and β Del (3.63 mag), are an example of the unquenchable human desire to leave something lasting behind. If we read the names of these stars backwards, we discover the words Nicolaus Venator, the Latin name of the Palermo astronomer Niccola Cacciatore, a long-time assistant to the famous Italian astronomer Giuseppe Piazzi. He greatly desired for his name to be preserved in the sky. He used a trick and gave his own name to these two stars, even though no one has the right to name a star after themselves. However, this lie was discovered too late, and the names had already become established. Even today, some atlases list them as names of unknown origin. They are the only stars in the sky that bear the name of a real person.

Nova Delphini 1967 - The constellation was made famous by a nova discovered on July 8, 1967 by English teacher and amateur astronomers G. Alcock, who also discovered the Nova Vulpeculae in 1968. This peculiar nova gradually brightened and became visible to the naked eye, then its brightness irregularly fluctuated and weakened again in December 1967. According to records, it is the "slowest nova". Its current magnitude is approximately 12.7mag, making it visible with a slightly larger amateur telescope.