Caldwell 16, also known as NGC 7243, is an open cluster located 2,300 light years from Earth in the constellation of Lacerta. It was discovered in 1788 by William Herschel, contains an estimated 211 stars and has an angular diameter of about 21 arc minutes. The age of this cluster is estimated at about 250 million years. The cluster is fairly bright, with an apparent magnitude of 6.4 making it visible with the naked eye.

Caldwell 10, also known as NGC 663, is a young open cluster located 8,800 light years from Earth in the constellation of Cassiopeia. It has an estimated 400 stars and spans about a quarter of a degree across the sky. The star cluster is assumed to form part of the stellar association Cassiopeia OB8, that is located in the Perseus Arm of the Milky Way, along with the open clusters M103, NGC 654, NGC 659, and some supergiant stars scattered between them, all of them having similar ages and distances.

Caldwell 8 (NGC 559) is an open cluster in the constellation Cassiopeia. It was discovered by William Herschel on 9 November 1787. About 120 stars populate the cluster, but only about 40 of them are of magnitude 12 or brighter. It is located near the open cluster NGC 637, and the bright magnitude +2.2 irregular variable star Gamma Cassiopeiae. The cluster is 7 arcmins across. The object is also called Ghost's Goblet.

Caldwell 22, also known as NGC 7662 or te blue snowball nebula, is a planetary nebula in the constellation Andromeda. It was discovered on October 6, 1784 by William Herschel. Many photos focus on the bright core of the nebula itself. But there is a large envelope of faint OIII signal surrounding the nebula, which has been captured in this image as well.

Caldwell 1, also known as NGC 188 or the Polarissima Cluster, is an open cluster in the constellation Cepheus. It was discovered by John Herschel in 1825. Unlike most open clusters, NGC 188 lies far above the plane of the galaxy and is one of the most ancient of open clusters known, at approximately 6.8 billion years old.

Caldwell 63, also known as NGC 7293 or the Helix Nebula, is a planetary nebula (PN) located in the constellation Aquarius. Discovered by Karl Ludwig Harding, most likely before 1824, this object is one of the closest of all the bright planetary nebulae to Earth. The distance, measured by the Gaia mission, is 655±13 light-years. Its age is estimated to be 10600 years. It is similar in appearance to the Cat's Eye Nebula and the Ring Nebula.

Caldwell 15, also known as NGC 6826 is a planetary nebula located in the constellation Cygnus. It is commonly referred to as the "Blinking Planetary". A distinctive feature of this nebula are the two bright patches on either side, which are known as Fast Low-Ionization Emission Regions, or FLIERS. They appear to be relatively young, moving outwards at supersonic speeds. Caldwell 15 is located at approximately 2000 lightyears from Earth.

Caldwell 51, also known as IC 1613, is an irregular dwarf galaxy located on the outskirts of the Local group (the galaxy ground that includes our Milky Way) in the constellation of Cetus. Caldwell 51 was discovered in 1906 by Max Wolf, and is approaching Earth at 234 km/s.

Caldwell 43 (also known as NGC 7814 or UGC 8) is a spiral galaxy about 40 million light-years away in the constellation Pegasus. The galaxy is seen edge-on from Earth. It is sometimes referred to as "the little sombrero", a miniature version of Messier 104. The star field behind NGC 7814 is known for its density of faint, remote galaxies. It's among the few bright galaxies that exhibit modest distortion and twisting of the galaxy's plane in optical wavelengths.

Caldwell 30, also known as NGC 7331, is an unbarred spiral galaxy about 43.79 million light-years away in the constellation Pegasus. It was discovered by William Herschel on 6 September 1784. The galaxy appears similar almost in size and structure to the Milky Way, and is sometimes referred to as "the Milky Way's twin".

Caldwell 19, or the Cocoon nebula, is a well known reflection/emission nebula in the constellation Cygnus. It is also member of the Sharpless II catalogue. The nebula is about 4,000 light-years away from us and the central star that ionises the surrounding gas is approximately 100,000 years old.

Caldwell 21 is an irregular galaxy located approximately 12.5 million light-years away in the constellation Canes Venatici. It is part of the M94 Group, a collection of galaxies in the vicinity of the Milky Way. Caldwell 21 is notable for its active star formation, which is evident from the numerous young, blue star clusters and pinkish star-forming regions scattered throughout the galaxy.

Caldwell 39 (NGC2392) is a bipolar double-shell planetary nebula (PN) in the constellation Gemini. The Sun-like central red star is surrounded by gas that it has emitted from its outer layers. The visible inner filaments are ejected by a strong wind of particles from the central star.

Caldwell 2, also known as NGC 40 or the Bow-Tie Nebula, is a planetary nebula located in the constellation Cepheus. The nebula is approximately 3,500 light-years away from Earth. It is a very small object, with an apparent diameter of only 0.9 arcmin.

Caldwell 48, also known as NGC2775, is a spiral galaxy located in the constellation Cancer. It is a so-called flocculent spiral galaxy, meaning the arms are patchy and discontinuous, giving them a fluffy or woolly appearance.

Caldwell 23, also known as NGC 891, is a spiral galaxy located approximately 30 light-years away in the constellation Andromeda. Its striking edge-on appearance has given it the nickname Silver Sliver galaxy. The galaxy is very similar in structure to our own Milky Way.

Caldwell 56, also known as NGC246, is a planetary nebula in the constellation Cetus. The characteristic shape of the bright outer shell has given it its nickname Skull Nebula. It is photographed here as an HOO image. The central white dwarf is resolved from its companion.

Caldwell 5, or IC342, is also known as the hidden galaxy, tucked away behind the dust of our own Milky Way. Individual frames did not reveal too much detail, but stacking 20h of exposure brought out the full splendour of this beautiful galaxy.

The Crescent nebula, also known as Sh2-105 and C27, is an iconic deep sky object in the constellation Cygnus. In 2018 this object was imaged, so the current image gives a good idea of the progress that has been made over time.

Caldwell 45 is a small galaxy in the constellation Boötes, art of the Virgo supercluster of galaxies. It is also known as NGC5248. This was an older dataset when processed, and calibration is not perfect, as is visible in the uneven background. But details in the galaxy have been fairly well capture.