By issue of August 2025
Astronomers used many lists to keep an eye on deep-sky objects such as clusters, nebulas and galaxies.
The number 82 cigar in the list of Charles Messier is Galaxy. The author captured a risk of 18.5 hours from November 2022 to March 2023 to create this image. Credit: Molly Wacking
- Babylonian astronomers created early star catalogs as the 12th century BC, later expanded to include the astronomical movements of the Sun, Moon and planets in 1000 BC.
- The Mesier (M) Catalog compiled by Charles Messier includes 109 bright, easily incorrect-to-comtes items visible in the northern hemisphere, which include various deep-blows object types.
- The new general catalog (NGC) and its index catalogs (IC) supplements compiled by John Louis Emil Draer, list of 7,840 and 5,386 objects respectively, mainly galaxy, nebula and star cluster, expanding on the earlier herschel catalogs.
- Other important catalogs mentioned in the the Sharpless (SH 2) catalog, and the rich galaxy groups and the abella catalogs for both the rich galaxy groups and the planet Nabula, which demonstrate diverse approaches to the celestial object classification and cataloging.
Humanity is obsessed with keeping astronomical records. Babylonies compiled their first list of stars around 1000 BCE in the 12th century BC, following it with an expanded catalog which includes the speed of the sun, moon and planets with familiar constellations and star groups. The Mayas inscribed in the stone and painted the calendars and almanacs of the fabric, tracked the planets, eclipses, and possibly also the anterior to the equator.
Today, telescopes and watches have allowed for accurate records of object locations. The Gaia satellite of the European Space Agency, our most abusive surveyor of the universe measured the status of about 1 billion stars and objects. A beginning can be confused with the piles of astronomers catalogs, which we use to identify the deep-sky items given in our telescopes, especially when many are listed in many catalogs. Let’s find out more common people.
The first catalog that is likely to introduce astronomers is Mesier Catalog. Nominated for the 18th -century French astronomer Charles Messier, the register includes 109 bright items (103 original, plus six later additions) that may be wrong to comets by unheard observers. Because he was watching from France with a 4 -inch refractor, all the messier objects appear in the Northern Hemisphere, with the South -35 ° announcement. The object is from star clusters and galaxies to nebula and supernova remains. For example, entries with prefix M are counted, the cannative is the elegant whirling galaxy Venatici M51.
There is another common catalog New general listOr NGC. Compiled by Danish astronomer John Luis Emil Draer in 1888, it includes 7,840 objects, ordered by the correct origin. Many objects are galaxies, but it also includes nebula and star cluster. Draer later created two supplements, Index list (IC), which is in the list of another 5,386 objects. The NGC was published in 1786 before the catalog of William and Caroline Herschelle.
For Nebula lovers, the sharpless catalog is a close friend. American astronomer Stewart Sharpless published his first catalog in 1953 with 142 objects, then added more to 312 in 1959. The list is almost particularly particularly the HII region (hydrogen -rich in hydrogen), in which some planets were surveys from the Palomar Observatory, with Supernova Remainants in Nebula and Mix. Sharpless objects carry a brief label Sh2, indicating that they come from its second list. For example, Lagoon Nebula, also known as M8, is SH2-25.
Cosherally, there are two abbel catalogs – for a rich galaxy groups, and for a planet Nebula. They were both compiled by the same American astronomer, George O Abel. The galactic catalogs include a total of 4,073 dense groups of galaxies (2,712 northern and 1,361 southern), requiring a minimum of 50 galaxies qualified. It is a challenging catalog to find out, which requires large binoculars and dark sky.
The planet Nabula Catalog, published in 1966, has 86 objects. Four was later determined for not having the planet nebula, but rather other types of nebula, a ring galaxy and an imaging artwork. Both catalog identifier uses Abel, which includes items such as Abel 21 (The Medusa Nebula) and Ebel 1656 (Coma Galaxy Cluster).
It is a sample of catalogs that encounter amateur astronomers the most, but can stumble in many more more than the objects tracking advanced astronomers. Let these catalogs be a guide on your astronomical adventure. happy hunting!
