NGC 4603 (Centaurus chain of Galaxies)

NGC 4603

NGC 4603 is a barred spiral galaxy with well defined spiral arms and dust lanes, and is at a distance of 108 MLY.

NGC 4603 is the most prominent galaxy in a diagonal line of fainter but interesting galaxies, finishing off with NGC 4650 A, an unusual “Polar Ring” bluish galaxy. (bottom right edge)

NGC 4622 (centre) a face-on spiral with a very prominent ring structure.

Using Cepheid variable stars, NGC 4603 is the most distant galaxy measured  by the Hubble Key Team for an accurate measurement of the Hubble constant refinement.

                                                  Two frame mosaic.

F. O. V.  38 x 69 min of arc.

Telescope.   Orion Optics UK AG 12.

Camera.   S Big ST4000 XCM OSC CCD.

Exposure and Date.   (2)  15 x 600 sec. + 12 x 600 sec.   July 2020, May 2021.

Location. (Wiruna) Ilford  N.S.W.