Mu1 Chamaeleontis

μ¹ Chamaeleontis
Observation data; Epoch J2000.0 Equinox ICRS
Constellation	Chamaeleon
Right ascension	10h 00m 43.7937s
Declination	−82° 12′ 52.812″
Apparent magnitude (V)	5.53
Characteristics
Evolutionary stage	main sequence
Spectral type	A0 IV
U−B color index	+0.05
B−V color index	+0.03
Astrometry
Radial velocity (Rv)	16±10 km/s
Proper motion (μ)	RA: −26.011 mas/yr ; Dec.: +31.141 mas/yr
Parallax (π)	8.0957±0.0795 mas
Distance	403 ± 4 ly ; (124 ± 1 pc)
Absolute magnitude (MV)	+0.23
Details
Mass	2.6 M☉
Radius	3.66 R☉
Luminosity	90.7 L☉
Surface gravity (log g)	3.73 cgs
Temperature	10,141+157; −240 K
Metallicity [Fe/H]	−0.18 dex
Rotational velocity (v sin i)	150 km/s
Other designations
	μ1 Cha, CPD−81°399, FK5 3980, HD 87971, HIP 49065, HR 3983, SAO 258554
Database references
SIMBAD	data

Mu¹ Chamaeleontis is a single star in the southern circumpolar constellation of Chamaeleon. Its name is a Bayer designation that is Latinized from μ¹ Chamaeleontis, and abbreviated Mu¹ Cha or μ¹ Cha. This star is dimly visible to the naked eye with an apparent visual magnitude of 5.53. Based upon parallax measurements, it is located approximately 403 light-years (124 pc) away from the Sun. The radial velocity is poorly constrained, but it appears to be drifting further away at the rate of about 16 km/s

This object has a stellar classification of A0 IV, matching an A-type subgiant star. It has 2.6 times the mass of the Sun and an effective temperature of 10,141 K, giving a bluish white glow. Due to its slightly enlarged radius, the star has a luminosity over 90 times that of the Sun. It is spinning rapidly with a projected rotational velocity of 150 km/s. Mu¹ Chamaeleontis' metallicity – elements more massive than helium – is 66% that of the Sun.

References

1 2 3 4 5 6 7 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
1 2 3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
1 2 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode:1975mcts.book.....H.
1 2 Johnson, H. L.; et al. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
1 2 Kharchenko, N.V.; et al. (November 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): 889–896. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. ISSN 0004-6337.
1 2 3 4 5 Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361.
1 2 Kervella, Pierre; et al. (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv:2109.10912. Bibcode:2022A&A...657A...7K. doi:10.1051/0004-6361/202142146. eISSN 1432-0746. ISSN 0004-6361.
1 2 McDonald, I.; et al. (15 June 2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. eISSN 1365-2966. ISSN 0035-8711.
1 2 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.
1 2 Huang, Su-Shu (September 1953). "A Statistical Study of the Rotation of the Stars". The Astrophysical Journal. 118: 285. Bibcode:1953ApJ...118..285H. doi:10.1086/145751. eISSN 1538-4357. ISSN 0004-637X.
↑ "mu. Cha". SIMBAD. Centre de données astronomiques de Strasbourg.
↑ Eggleton, P. P.; Tokovinin, A. A. (11 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. eISSN 1365-2966. ISSN 0035-8711.

[DR3-1] 1 2 3 4 5 6 7 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[Anderson2012-2] 1 2 3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.

[Houk1975-3] 1 2 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode:1975mcts.book.....H.

[Johnson1966-4] 1 2 Johnson, H. L.; et al. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.

[Karchenko2007-5] 1 2 Kharchenko, N.V.; et al. (November 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): 889–896. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. ISSN 0004-6337.

[Anders2019-6] 1 2 3 4 5 Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361.

[Kervella2021-7] 1 2 Kervella, Pierre; et al. (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv:2109.10912. Bibcode:2022A&A...657A...7K. doi:10.1051/0004-6361/202142146. eISSN 1432-0746. ISSN 0004-6361.

[McDonald2017-8] 1 2 McDonald, I.; et al. (15 June 2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. eISSN 1365-2966. ISSN 0035-8711.

[Stassun2019-9] 1 2 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.

[Huang1953-10] 1 2 Huang, Su-Shu (September 1953). "A Statistical Study of the Rotation of the Stars". The Astrophysical Journal. 118: 285. Bibcode:1953ApJ...118..285H. doi:10.1086/145751. eISSN 1538-4357. ISSN 0004-637X.

[SIMBAD-11] "mu. Cha". SIMBAD. Centre de données astronomiques de Strasbourg.

[Eggleton2008-12] Eggleton, P. P.; Tokovinin, A. A. (11 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. eISSN 1365-2966. ISSN 0035-8711.