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Contains:  IC 1275, NGC 6559, IC 1274, IC 4685
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Simeis 188 - gas, dust and clouds complex in Sagittarius

Technical card

Resolution: 2655x2138

Dates:June 27, 2017June 29, 2019June 30, 2019

Astrodon 3nm Ha : 35x300" bin 1x1
Astrodon 3nm OIII: 13x300" bin 2x2
Astrodon E-Series 1,25" RGB: 72x60" bin 2x2
ZWO H-alpha 7nm: 52x120" (gain: 139.00) bin 1x1
ZWO RGB 31 MM: 53x30" bin 1x1

Integration: 7.4 hours

Avg. Moon age: 18.97 days

Avg. Moon phase: 11.95% job: 2865525

RA center: 272.263 degrees

DEC center: -23.882 degrees

Pixel scale: 1.174 arcsec/pixel

Orientation: 359.502 degrees

Field radius: 0.556 degrees

Locations: Rooftop Terrace, Vienna - City Center, Austria

Data source: Backyard


Imaged with my 200/800 f4 Lacerta newton from Vienna.

Object description (compiled from below cited paper)
About a degree to the east of the famous Lagoon Nebula (M 8), Simeis 188 comprises a complex of emission and reflection nebulae and dark clouds, and lies near a loose open cluster, Collinder 367, located within the HII region IC 4685. IC 4685 is a large diffuse nebula centred on V 3903 Sgr (HD 165921), an eclipsing binary comprising two main-sequence O stars (O7 V + O9 V).

On the southeastern edge of IC 4685, NGC 6559 is a bright-rimmed cloud, with the rim running NE–SW, and lying close to IRAS 18068–2405. Together with IC 4685, NGC 6559 is also known as Sh2-29.

The northeastern edge of Simeis 188 is dominated by two bright emission nebulae: IC 1274 (Sh2-32) in the north, illuminated by two stars, and IC 1275 (Sh2-31); these two are separated by the dark cloud B 91.

There are two more Barnard dark nebulae lying in front of IC 4685: B 302 and B 303, just NW and SE of V 3903 Sgr, respectively. They seem to be components of a long thin dust lane lying across and in front of the emission nebula.

Collinder 367 is older than NGC 6530, but still fairly young, and lies at a similar distance (∼7 Myr and ∼1.2 kpc). V 3903 Sgr is much younger, with an age (2 Myr) and distance similar to NGC 6530, and may represent a later generation of star formation.

At the lowermost southern margin of the image lies the planetary nebula Minkowski M 1-41.

The designation “Simeis” comes from the catalogue of Gaze & Shajn (1955) developed at the Simeiz Observatory in Ukraine.

Tothill, N. F. H. et al. (2008): The Lagoon Nebula and its Vicinity; Handbook of Star Forming Regions Vol. II Astronomical Society of the Pacific, 2008 Bo Reipurth, ed.

Annotated image



License: None (All rights reserved)



Annotated image

Sky plot

Sky plot


Simeis 188 - gas, dust and clouds complex in Sagittarius,