Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. HD 156668 is an orange dwarf star found in the Hercules constellation which is approximately 78.4 light-years away from the earth. The star has only about 27% of the Sun s bolometric luminosity including a mass approximately 72% less and about 75% of its diameter. The star appears to have 85% enriched in iron in relation to the abundance of hydrogen as the Sun. From 1911 to 1915, Photographic Stellar Spectrum surveys have been carried out by Annie Jump Cannon and Edward Charles Pickering.
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