This is NGC 7789, one of the richest open star clusters in the Milky Way and goes by Caroline’s Rose cluster named after its discoverer, Caroline Herschel in 1783 (sister of William Herschel). Under dark skies the loops of stars and dark lanes resemble the swirling pattern when looking down on rose petals. It also goes by Caroline’s Haystack and the White Rose Cluster.
The plus 1000 star cluster is located in the constellation of Cassiopeia approximately 6200 light-years away with an estimated diameter of 50 light-years. Interestingly, most open star clusters are relatively young (less than 100 million years), however, NGC 7789 is about 1.5 billion years old making it one of the oldest open clusters but not quite as old as most globular clusters which can be several billion years old.
The overall field is quite impressive, filled with many colorful stars. The cluster is very close to popular nebulae such as NGC 7635, the Bubble Nebula, and there is some very faint hydrogen in this region but I really wanted to focus in on the starfield. I love colorful stars and this field has a good dynamic range.
The plus 1000 star cluster is located in the constellation of Cassiopeia approximately 6200 light-years away with an estimated diameter of 50 light-years. Interestingly, most open star clusters are relatively young (less than 100 million years), however, NGC 7789 is about 1.5 billion years old making it one of the oldest open clusters but not quite as old as most globular clusters which can be several billion years old.
The overall field is quite impressive, filled with many colorful stars. The cluster is very close to popular nebulae such as NGC 7635, the Bubble Nebula, and there is some very faint hydrogen in this region but I really wanted to focus in on the starfield. I love colorful stars and this field has a good dynamic range.
Dates: 10-27-25, 10-29
Camera: ZWO ASI1600MM-Pro
Telescope: Astro-Tech AT115EDT 115mm Refractor Telescope
Barlow: None
Focal Length: 805mm (644mm w/ FR)
f/7 (f/5.6)
Focal Reducer: 0.8x AstroTech Field Flatterner/Focal Reducer
Mount: Orion Sirius
Filter Wheel: ZWO
EFW 8 x 1.25"
Filter: ZWO R, G, B, L
Focuser: ZWO EAF
Autoguiding: ASI120 Mini attached to an Agena 50mm Guide Scope/ZWO 60mm Guidescope
Exposure: L 100 x 90, R 88 x 90, G 82 x 90, B 84 x 90 (8h 51m)
Gain: 139
Offset 20
Sensor Temp: -10 C
Processing: NINA, PixInsight, Photoshop, BlurXTerminator, StarXTerminator, NoiseXTerminator, GraXpert, Bill Blanshan Color Masks, Bill Blanshan Stretching.
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