Galactic Nebulae Sh 2-89 & Sh 2-90
History
The American astronomer Stewart Sharpless searched in the 1950-ies the photo plates of the «Palomar Observatory Sky Survey» made with the 48 inch Schmidt telescope and published it in 1959 a catalogue of 313 H-II regions, among them Sh 2-89 and Sh 2-90. [310] In 1965 Beverly T. Lynds added the nebula Sh 2-90 as LBN 063.10+00.46 (or LBN 144) in her «Catalogue of Bright Nebulae». [270]
Physical Properties
Sh 2-89 and 2-90 are H-II regions with active star formation. Many young stellar objects have been identified within the nebula. The gas is excited by O and B type of stars. The distance is estimated to 1.5 kpc. [145, 218, 607]
| Name | Type | RA (J2000.0) | Dec (J2000.0) | Size ['] | Magnitudes | Identifiers |
|---|---|---|---|---|---|---|
| Sh 2-89 | HII | 19h 50m 04s | +26° 28' 23" | B 13.72; V 12.11 | BWE 1948+2620; SH 2-89; WB 1948+2620; WSRTGP 1948+2620 | |
| Sh 2-90 | HII | 19h 49m 12s | +26° 51' 36" | 4.7 × 4.7 | B 14.6; V 13.63 | GAL 063.168+00.46; GRS G063.20 +00.40; LBN 063.10+00.46; LBN 144; SH 2-90; [T70] 26; [TP72] 69 |
Finder Chart
The nebula Sharpess 2-90 is located in the constellation Vulpecula. On 18 July it is in opposition to the Sun and culminates at local midnight. The best observation time is January to December.
