Ara's Dragons

Posted by Wellerson Lopes
on Monday, September 03, 2018

High resolution:

Name: NGC 6188
Type: Open cluster with nebulosity
Distance: 4,000 light-years
Constellation: Ara [1]

NGC 6188 is an emission nebula located about 4,000 light years away in the constellation Ara (Latin: "The Altar"). It has a radius about 300 light-years. The bright open cluster NGC 6193, at the top of image, visible to the naked eye, is responsible for a region of reflection nebulosity within NGC 6188.[1] The nebula is nominated by many astrophotographers as Ara's Dragons because of the shape of the nebulosity at the center.

NGC 6188 is a star forming nebula, and is sculpted by the massive, young stars that have recently formed there – some are only a few million years old. This spark of formation was probably caused when the last batch of stars went supernova.[1]

NGC 6193 is open cluster containing 27 stars, visible to the unaided eye.[1] NGC 6193 lies at the center of the Ara OB1 association, which extends over a square degree. The cluster is associated with (and provides the energizing radiation for) neighboring regions of the nebulosity NGC 6188.[1]

The brighter star in the image is indeed a multiple star system dominated by two O class system.[1] The star HD 150136 is a triple system[2] while HD 150135 star is a binary system[3]. HD 150136 has an apparent magnitude of 5.54 and HD 150135 has 6.89.[1]

[1] Wikipedia
[2] Sana, H.; Le Bouquin, J.-B.; Mahy, L.; Absil, O.; De Becker, M.; Gosset, E. (2013). "Three-dimensional orbits of the triple-O stellar system HD 150136". Astronomy & Astrophysics. 553
[3] Huang, W.; Gies, D. R. (2006). "Stellar Rotation in Young Clusters. I. Evolution of Projected Rotational Velocity Distributions". The Astrophysical Journal. 648

I registered this picture on July, 21th, 22th and 23th 2017 in Padre Bernardo - Goiás - Brazil in 10th Brazilian Meeting of Astrophotography. Bortle Scale: 3

Technical data:
Gain: 0, Offset: 10, camera's temperature: -15°C, 5h05m of exposition, darks, flats and bias applied.
The luminance channel was composed by H-Alpha narrowband. The Red channel was composed by Red and H-Alpha.
H-Alpha: 39 x 300s / Bin 1x1
R: 16 x 150s / Bin 2x2
G: 14 x 150s / Bin 2x2
B: 14 x 150s / Bin 2x2

- Equatorial Mount Orion Atlas EQ-G
- GSO Ritchey-Chretien Telescope 8" F8
- ZWO ASI1600MM Cooled
- Focal reducer Astro-Physics 67 CCDT
- Guided with ASI120MM ZWO using OAG
- ZWO EFWmini (5 x 1.25")
- Filter Optolong 1.25" H-Alpha 7nm
- Filter Optolong 1.25" R
- Filter Optolong 1.25" G
- Filter Optolong 1.25" B

- Capture: APT - Astro Photography Tool 3.50
- Processing: PixInsight 1.8 and Adobe Photoshop CS5
- Guiding: PHD2
- Control: EQMOD and SkyTechX

To leave a comment you must be a member of our community.
Login to your account now, or register for an account to start participating.
No one has commented yet.

Join our Community!

Our community is FREE to join. To participate you must either login or register for an account.



Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. View our Privacy Policy.

Find us on Facebook