Arp 313 (NGC 3391, 3994, 3995) from my „Jade“ observatory

This is one of the first images with my new equipment on the second pier „Deep Sky Pier“ in my „Jade Observatory“. Arp 313 is a triplet of galaxies which includes NGC 3991, NGC 3994 and NGC 3995, all situated in the constellation Ursa Maior.

Data calibration, registration and the final processing was done with PixInsight. The result was as follows:

In this image you can see some quasars. The most distant quasar of them is:

SDSS J115630.47+320929.6 with a redshift of 3.035 and an apparent mag_v of 20.6 (SDSS DR17).

Here is an overview of the used equipment and the exposure times:

• Date: March 2025
• Location: Varel
• Telescope/Lense: 6″ Lacerta Newton
• Focal length [mm]: 600
• Focal ratio: 4
• Mount: Skywatcher EQ 8
• Camera: Lacerta Deepsky 2600 M
• Autoguiding: Off-Axis with ZWO Asi 120 MM Mini
• Filter: L:R:G:B
• Exposure time [min]: 240:60:63:72
• Resolution: 1.31/px