Cassiopeia Widefield, California

Cassiopeia Widefield
Panamint Valley, California   –   December 6, 2021
— Ralph Paonessa
EOS 6D Ha modified   *   Sigma 50mm f/1.4 EX DG HSM   *   ISO 1600   *   f/4

A wide view of the circumpolar constellation Cassiopeia and its familiar M- (or W-) shaped asterism in the northern sky,.

Traversed by the Milky Way, it is rich in stars, nebulas, and star clusters. Several red emission nebulas are visible. The small red nebula at upper left of center is NGC 281, and the orange star to its left is Shedar (α Cas), the brightest star in Cassiopeia, and the left peak of the "M" shape.

The larger red nebula at lower left is NGC 7822. The two prominent nebulas at right are familiar to astrophotographers as the Heart and Soul (IC 1805 and IC 1848).

The bright concentrations of stars above the Heart are in the nieghboring constellation Perseus and are known as the Double Cluster (NGC 869 and NGC 884).

This image was created by stacking 21 tracked exposures of 321 seconds each for a total of 1.9 hours. Stacked and processed in PixInsight, and further adjusted in Lightroom.

Tracked using a Sky-Watcher Star Adventurer. The EOS 6D was filter-modified to increase sensitivity to red H-alpha emission.

Photo ID: Cassiopeia RGB v3