Celestial hemisphere:  Northern  ·  Constellation: Sagitta (Sge)  ·  Contains:  7 Sge  ·  7 del Sge  ·  8 Sge  ·  8 zet Sge  ·  9 Sge  ·  HD186945  ·  HD186962  ·  HD186981  ·  HD187258  ·  HD187282  ·  HD187321  ·  HD187323  ·  HD187566  ·  HD187596  ·  HD187655  ·  HD188061  ·  HD188102  ·  HD350386  ·  HD350387  ·  HD350388  ·  HD350398  ·  HD350399  ·  HD350400  ·  HD350416  ·  HD350417  ·  HD350420  ·  HD350422  ·  HD350438  ·  HD350439  ·  HD350451  ·  And 188 more.
SH2-84 - WR128, Georg N. Nyman
Powered byPixInsight

SH2-84 - WR128

Revision title: SH2-83 - WR128 Revisited

SH2-84 - WR128, Georg N. Nyman
Powered byPixInsight

SH2-84 - WR128

Revision title: SH2-83 - WR128 Revisited

Equipment

Loading...

Acquisition details

Loading...

Description

This HII region, also called LBN 131, is near in the sky to the Wolf-Rayet star WR 128. Both Sharpless and Avedisova list WR 128 as an ionising star. However, there is some controversy about whether Sh 2-84 is part of the ring nebula surrounding this star or lies at another distance. Both can be found in the constellation Sagitta. 

A look at this region in hydrogen-alpha reveals that although WR 128 lies in this direction, Sh 2-84 appears to be the brightest part of an enormous ring of ionised gas that is not centred on WR 128 but may instead surround the O7.5 I supergiant QZ Sge (a blue supergiant) . Given the size of the ring it may be much closer than the Wolf-Rayet star.

Most often, the entire region is not imaged due to the very weak emission - both Ha and OIII are rather weak with the exception of the SH2-84 arch.

Comments

Revisions

  • SH2-84 - WR128, Georg N. Nyman
    Original
  • Final
    SH2-84 - WR128, Georg N. Nyman
    B

B

Title: SH2-83 - WR128 Revisited

Description: 3 additional nights of OIII and Ha to enhance the nebulosity plus a crop to better focus on the nebula itself

Uploaded: ...

Sky plot

Sky plot

Histogram

SH2-84 - WR128, Georg N. Nyman