Rho Ophiuchi Nebula (Mosaic)IC 4603 - IC 4604
The IC4603/IC4604 nebula lies in the Ophiuchi constellation at a distance of approximately 450 light-years from Earth.
This picture is a 2 tiles mosaic, with an integration time of about 3 hours each.
The pictures were taken at La Banderita Observatory, La Pampa province, Argentina in two sessions during June 15 and 16 2018.
The used equipment setup: Newton GSO 200 F4 with GPU Comma Corrector, Canon 600D/T3i modified and refrigerated (sensor measured and regulated temperature -5°C), Astronomik CLS CCD filter, Sky Watcher NEQ6 mount, and homemade electronic focuser and anti-dew systems.
A wider FOV taken with a 200 mm focal length lens shows the ubication of these nebulas in the Rho Ophiuchi cloud complex. .
Technical data
| Acquisition site | San Antonio de Areco, Buenos Aires, Argentina |
| Acquisition dates | 10-17-2015: Tile 1 x 17 (ISO1600) 11-18-2017: Tile 1 x 16 (ISO800) - Tile 2 x 34 (ISO800) |
| Instrument | Newton GSO F4 200 with GPU coma corrector. |
| Mount | Sky-Watcher NEQ6, managed by EQmod |
| Guide | Off-Axis, with Lodestar camera |
| Camera | Modified Canon 600D/T3i No IR Filter (Full Spectrum mod, using Astronomik MC Clear) Refrigerated (regulated temperature) |
| Camera sensor temperature | -5°C (on-sensor measured and regulated) |
| Filter | Astronomik Clip CLS CCD |
| Integration | Tile 1: 33 subframes @ ISO 800 / ISO 1600, 5 minutes each (total integration time: 2 hours 45 minutes Tile 2: 34 subframes @ ISO 800, 5 minutes each (total integration time: 2 hours 50 minutes |
| Calibration | 49 flats, 400 bias, 84 darks. |
| Resolution | 1.1 arcsec/pixel 787 mm actual focal, 4.2 um x 4.2 um pixels |
| Native size (each tile) | 5202 x 3465 pixels |
| Mosaic size | 5093 x 6150 pixels |
| FOV | 1°33’ x 1° 53' |
| Image center coordinates | RA: 5 h 38 min Dec: -69° 31' Rotation: 10° |
| Process | PixInsight 1.8 |