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Wildrik Botjes Planetarium
Physics & Astronomy Department

Astr110 Photography Projects, Fall 2007

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NGC 869 Open Cluster, Eun Soung Lim

NGC 869

This object is an open cluster. Open clusters are a group of gathering of thousands of stars forming a giant molecular cloud. It is about 7000-light years away. It is visible to bare eyes and was even found in 130 BC by Greek astronomer Hipparchus. Open clusters are found only in spiral and irregular galaxies, only active star formation is occurring. They are usually less than a few hundred million years old.

The image shows one of the open cluster on the center of the image. It is where the stars are crowded together. The image doesn't consist any color. The reason why I decided to do Mosaic is because the Professor Molnar said not many people did it so it is a rare case. The characteristic of being unique has interested me. Also by using Mosaic method, I could see the nice whole view of the open cluster and see a part of the other cluster, NGC 884 on the left hand side of the image too. The linear size of the cluster is some about 24451 light years .

References:
Wikipedia. <http://en.wikipedia.org/wiki/Open_cluster>

Suro, Jose. "Star Cluster Dreams." Astronomy Picture of the Day. <http://antwrp.gsfc.nasa.gov/apod/ap060413.html>

Right Ascension (J2000) 02:20:50
Declination (J2000) +57:18:01
Filters used Clear
Exposure time 10 seconds per image, 10 images per field, Mosaic of 4 fields
Date observed

October 19, 2007