• Source: 74 Ophiuchi

74 Ophiuchi is a suspected binary star in the equatorial constellation of Ophiuchus, near the border with Serpens Cauda. It is visible to the naked eye as a faint, yellow-hued point of light with a combined apparent visual magnitude of 4.85. The system is located at a distance of 238 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +4.4 km/s.
The primary member, designated component A, is an aging giant star with a stellar classification of G8III and an estimated age of 1.73 billion years. Having exhausted the hydrogen supply at its core, the star has expanded to 10.5 times the Sun's radius. It is a red clump giant, which means it is on the horizontal branch and is generating energy through helium fusion at its core. The star has 2.4 times the mass of the Sun and is radiating 66 times the Sun's luminosity from its swollen photosphere at an effective temperature of around 5,073 K.
The magnitude 11.5 secondary, component B, lies at an angular separation of 28.1″ from the primary, as of 2008. A visual companion, component C, is magnitude 12.28 and has a separation of 57.9″.




References

Kata Kunci Pencarian:

• Bintang
• 82 G. Eridani
• Planet luar surya
• Daftar bintang di rasi bintang Ophiuchus
• 74 Ophiuchi
• Ophiuchus
• List of stars in Ophiuchus
• 36 Ophiuchi
• Eta Ophiuchi
• V1054 Ophiuchi
• Rho Ophiuchi
• Barnard's Star
• Gamma Ophiuchi
• List of brightest natural objects in the sky