Henize 70 (LN 120 N70, DEM301)
Henize 70 is a luminous superbubble of interstellar gas located in the Large Magellanic Cloud (LMC)in the constellation Doradus. Henize 70 measures about 300 light-years in diameter,
At its center is a small group of extremely hot and massive stars. Some of them are rapidly losing mass and have stellar winds blowing from their surfaces with velocities that approach 4000 kilometers per second.
Because the lifetimes of massive stars are measured in only tens of millions of years, after one supernova has swept clear a bubble around itself, there isn’t enough time for the interstellar medium to back-fill the cavity before other stars explode in the same region. Each subsequent supernova will rejuvenate the cavity left by the previous ones.
Superbubbles provide astronomers with an excellent opportunity to explore the connection between the life-cycles of stars and the evolution of galaxies.
Technical Details
- Object: Henize 70
- Other Names: LN 120 N70, DEM301
- Object Type: Emission nebula in the Large Magellanic Cloud
- Object Data: Apparent Magnitude = 14, Angular Size = 7 x 8 arc-minutes
- Object Position (Equinox 2000): RA= 5h 43m, Dec= -67° 51´, Constellation Doradus>
- Date: 2021 Jan 01 - Jan 03 (3 nights)
- Location: Chile Remote Observatory, Observatorio El Sauce, Chile
- Partnership: Operated in partnership with David Churchill
- Telescope: Planewave CDK-17 (with Focal Reducer: f/4.5; FL = 1945mm)
- Camera: QHY 16200A with Integral 7-position Filter Wheel
- Mount: Astro-Physics 1600GTO
- Guider: Agena Starguide II / SBIG STi
- Sub-Exposures: Astronomik Filters
- H-Alpha (6nm):65 x 10 min = 650 min - Total Exposure: 10h 50m
- File Name: Henize70-CDK21-C01.jpg
- Field of View: 38.9' x 58.3' at 0.64 arc-sec/pixel
- Original Image Size: 3630 x 4540 pixels (16.5 MP); 12.1" x 15.1" @ 300 dpi
- Data Acquisition: David Churchill
- Image Processing: Fred Espenak
- Maxim DL: Image Calibration, Stacking, Digital Development Processing
- Adobe Camera Raw: Noise Reduction
- Photoshop CC: Curves, Levels - Copyright: Fred Espenak