From: "bw msg01" <bw_msg01@...> To: "QSI-CCD" <[email protected]> Sent: Saturday, May 6, 2023 12:41:04 AM Subject: [QSI-CCD] NGC 4535 image
This is an image of NGC 4535, a grand-design spiral galaxy in the Virgo Cluster and one of its largest spiral members. It's about 15% larger than the Milky Way galaxy and was included in the Hubble Extragalactic Distance Scale project, a research effort directed at refining the Hubble constant to a 10% uncertainty.? The project identified 39 well-resolved Cepheid variable stars in NGC 4535 to determine its distance at 52M +/- 1.9 light-years. The image was captured over a 4-night period in April from New Mexico. Image acquisition was done with a 12.5" PlaneWave scope and a QSI-640ws camera at f/8 for a final LRGB integration of 16.8 hours.
