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Pi Chamaeleontis, its name Latinized from π Chamaeleontis, is a binary star system located in the southern circumpolar constellation of Chamaeleon. It is dimly visible to the naked eye with an apparent visual magnitude of 5.64. Parallax measurements by Hipparcos put the system approximately 135 light-years (41.5 parsecs) away. It is drifting closer with a radial velocity of −10 km/s.

The Hipparcos satellite mission derived a 223 d orbit on the basis of its motion caused by an unseen companion. The visible component is an A-type subgiant or F-type giant star with an effective temperature of about 6,900 K. It has an absolute magnitude of 2.56, a mass of 1.52 M_☉, and a radius of 2.2 M_☉. It is roughly 1.8 billion years old.

References

1. ^ van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
2. ^ Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A.
3. ^ Houk, N.; Cowley, A. P. (1975). "University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90°.0 to -53°.0". Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. 1. Bibcode:1975mcts.book.....H.
4. Kharchenko, N. V.; et al. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. S2CID 119323941.
5. ^ Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
6. ^ Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey". Astronomy & Astrophysics. 530: A138. arXiv:1103.4651. Bibcode:2011A&A...530A.138C. doi:10.1051/0004-6361/201016276. S2CID 56118016.
7. ^ Holmberg, J.; Nordström, B.; Andersen, J. (2009). "The Geneva-Copenhagen survey of the solar neighbourhood". Astronomy & Astrophysics. 501 (3): 941. arXiv:0811.3982. Bibcode:2009A&A...501..941H. doi:10.1051/0004-6361/200811191. S2CID 118577511.
8. ^ Lambert, David L.; Reddy, Bacham E. (2004). "Lithium abundances of the local thin disc stars". Monthly Notices of the Royal Astronomical Society. 349 (2): 757. arXiv:astro-ph/0401259. Bibcode:2004MNRAS.349..757L. doi:10.1111/j.1365-2966.2004.07557.x. S2CID 118931004.
9. ^ Chandler, Colin Orion; McDonald, Iain; Kane, Stephen R. (2016). "The Catalog of Earth-Like Exoplanet Survey Targets (CELESTA): A Database of Habitable Zones Around Nearby Stars". The Astronomical Journal. 151 (3): 59. arXiv:1510.05666. Bibcode:2016AJ....151...59C. doi:10.3847/0004-6256/151/3/59. S2CID 119246448.
10. Balachandran, Suchitra (1990). "Lithium depletion and rotation in main-sequence stars". The Astrophysical Journal. 354: 310. Bibcode:1990ApJ...354..310B. doi:10.1086/168691.
11. "pi Cha". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-31.
12. Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
13. Bartkevicius, A.; Gudas, A. (2001). "Kinematics of Hipparcos Visual Binaries. I. Stars with Orbital Solutions". Baltic Astronomy. 10 (4): 481–587. Bibcode:2001BaltA..10..481B. doi:10.1515/astro-2001-0402. S2CID 117700350.

v t e Constellation of Chamaeleon
List of stars in Chamaeleon Chamaeleon in Chinese astronomy
Stars	Bayer α β γ δ δ ε ζ η θ ι κ μ μ ν π Variable R T Z RS RZ CT CU DI DR DX DY HR 3393 3543 3695 4170 4268 4385 4397 4507 4509 4649 4976 5188 HD 63454 (Ceibo) 115088 116852 Other 2MASS J11011926–7732383 AB ChaHα8 CHXR 73 L 34-26 WISEA J120037.79-784508.3
Exoplanets Cha 110913−773444 ChaHα8 b COCONUTS-2b HD 63454 b OTS 44
Star clusters η Chamaeleontis cluster
Nebulae Chamaeleon complex NGC 3195 IC 2631
Galaxies	NGC 2915
Category

• F-type giants
• Binary stars
• Chamaeleon
• Bayer objects
• Durchmusterung objects
• Henry Draper Catalogue objects
• Hipparcos objects
• Bright Star Catalogue objects