NGC 1981 (also known as OCL 525) is an open cluster which is located in the constellation Orion. It was discovered by John Herschel on 4 January 1827. Its apparent magnitude is 4.2 [3] and its size is 28.00 arc minutes. It lies to the north of the Orion Nebula, separated from it by the Sh2-279 region containing NGC 1973, 1975, and 1977.

ngc 1981（也稱為ocl 525）是位於獵戶座的一個疏散星團。它是約翰·赫歇爾於1827年1月4日發現的。它的視星等為4.2等 [3] ，大小是28弧分。它位於獵戶座大星雲的北部，隔開它與m43的是包含於 sh2-279區域的ngc 1973，1975和1977。

NGC 1981 （也称为 OCL 525）是位于 猎户座 的一个 疏散星团。 它是 约翰·赫歇尔 于1827年1月4日发现的。 它的 视星等 为4.2等 [3]，大小是28 弧分。 它位于 猎户座大星云 的北部，隔开 …

NGC 1981 is a Star Cluster + Nebula in the Orion constellation. NGC 1981 is situated close to the celestial equator and, as such, it is at least partly visible from both hemispheres in certain times of the year.

his underappreciated object, also known as Collinder 73, is an open cluster located 1300 light years away in the constellation of Orion, just north of the Running Man Nebula. It is equal to the full m...

NGC 1981 (NGC1981) is a open star cluster that has a distance from Earth of 1,300.00 light years. It can be found in the constellation of Orion. It was discovered in 1827 by John Herschel.

NGC 1981 (OCL 525), the Upper Sword Cluster is a relatively large (28') and very bright open cluster in the constellation Orion. NGC 1981 is located to the north of the Orion Nebula, separated from it...

2024年12月15日 · Data at NED - NASA/IPAC Extragalactic Database : NGC 1981. Link by name to the catalogue in VizieR:

NGC 1981 sits just 1° north of the Orion Nebula (M42) in Orion's Sword. The cluster is part of the Orion Nebula Complex that also involves NGC 1973, NGC 1975 and NGC 1977 as well as M42 and M43. Beautiful area for study with any size optical instrument!

NGC 1981是猎户座的一个疏散星团。