Terzan Catalogue
Astronomical catalogue of globular clusters
From Wikipedia, the free encyclopedia
The Terzan Catalogue (abbreviation: Ter) is an astronomical catalogue of globular clusters.
| Alternative names | Agop Terzan Catalogue of Globular Star Clusters |
|---|---|
| Target | Globular clusters |
| Named after | Agop Terzan |
| Started | 1966 |
| Ended | 1971 |
Overview
The Terzan Catalogue consists of 11 globular clusters discovered by Agop Terzan using infrared observations made at Lyon Observatory in France during the 1960s and early 1970s. Most of the globular clusters are located in the constellations of Sagittarius and Scorpius, near the Milky Way's Galactic Center; Terzan 7 and Terzan 8 are most likely part of the Sagittarius Dwarf Elliptical Galaxy. Although all of the Terzan Catalogue objects were originally presumed to be globular clusters, there have been recent suggestions (by Mikkel Steine and others) that some of them may in fact be open clusters.[1]
Since the original Terzan 11 is a duplicate of Terzan 5, more recent versions of the catalogue have renamed the original Terzan 12 as Terzan 11.[2]
The catalogue is based on scientific papers published by Agop Terzan in 1966 (for Terzan 1),[3] 1967 (for Terzan 2),[4] 1968 (for Terzan 3 to 8),[5] and 1971 (for Terzan 9 to 12).[6]
List of clusters
List of star clusters in the Terzan Catalogue:[2]
| Object | Constellation | Right ascension (J2000)[2] |
Declination (J2000)[2] |
Apparent magnitude[2] | Diameter (′)[2] |
|---|---|---|---|---|---|
| Terzan 1 | Scorpius | 17h 35m 47.8s | −30° 28′ 11″ | 13.9 | 2.4' |
| Terzan 2 | Scorpius | 17h 27m 33.4s | −30° 48′ 08″ | 14.29 | 0.7' |
| Terzan 3 | Scorpius | 16h 28m 40.1s | −35° 21′ 13″ | 12.0 | 4.0' |
| Terzan 4 | Scorpius | 17h 30m 38.9s | −31° 35′ 44″ | 16.0 | 0.7' |
| Terzan 5 | Sagittarius | 17h 48m 04.9s | −24° 48′ 45″ | 13.85 | 2.1' |
| Terzan 6 | Scorpius | 17h 50m 46.4s | −31° 16′ 31″ | 13.85 | 1.2' |
| Terzan 7 | Sagittarius | 19h 17m 43.7s | −34° 39′ 27″ | 12.0 | 6.0' |
| Terzan 8 | Sagittarius | 19h 41m 45s | −34° 00′ 01″ | 12.4 | 4.4' |
| Terzan 9 | Sagittarius | 18h 01m 38.8s | −26° 50′ 23″ | 16.0 | 1.5' |
| Terzan 10 | Sagittarius | 18h 02m 57.4s | −26° 04′ 00″ | 14.9 | b. d. |
| Terzan 11 | Sagittarius | 18h 12m 15.8s | −22° 44′ 31″ | 16.4 | 1.5' |
