| 1. | It is considered to be one of the more inconspicuous open clusters.
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| 2. | Open clusters are very important objects in the study of stellar evolution.
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| 3. | It is located in the Heart Nebula in open cluster IC 1805.
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| 4. | Pi Puppis is the brightest star in the open cluster Collinder 135.
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| 5. | This latter region includes the open clusters NGC 2335 and NGC 2343.
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| 6. | "' NGC 2158 "'is an open cluster in the constellation of Gemini.
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| 7. | This object, found in the Pleiades open cluster, received the name Teide 1.
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| 8. | Open clusters are key objects in the study of stellar evolution.
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| 9. | M46 is located close by to another open cluster, Messier 47.
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| 10. | "' IC 4665 "'is an open cluster in the constellation Ophiuchus.
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