Rho Ophiuchi Nebula (Mosaic)
IC 4603 - IC 4604

Rho Ophiuchi cloud complex

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