CD-44 170

Star in the constellation Phoenix

CD-44 170
Observation data Epoch J2000 Equinox J2000
Constellation	Phoenix
Right ascension	00^h 39^m 58.8243^s^[1]
Declination	−44° 15′ 11.5824″^[1]
Apparent magnitude (V)	11.401
Characteristics
Evolutionary stage	main-sequence star
Spectral type	M0.5V^[2]
Astrometry

Radial velocity (R_v)	11.85±0.19^[3] km/s
Proper motion (μ)	RA: 483.002^[3] mas/yr Dec.: −221.111^[3] mas/yr
Parallax (π)	42.3320 ± 0.0248 mas^[3]
Distance	77.05 ± 0.05 ly (23.62 ± 0.01 pc)

Details

Mass	0.53^[2] `M`_☉
Radius	0.52^[4] `R`_☉
Luminosity	0.04597±0.00087^[5] `L`_☉
Temperature	3604±72^[6] K
Metallicity [Fe/H]	−0.09±0.09^[6] dex
Rotation	31.8 d^[2]

Other designations
Gaia DR2 4980466929964496128, GJ 27.1, HIP 3143, TYC 7531-1014-1, 2MASS J00395880-4415117^[1]
Database references
SIMBAD	data

CD-44 170, also known as Gliese 27.1, Gliese 9018 and HIP 3143, is an M-type main-sequence star. Its surface temperature is 3,604 K (6,028 °F; 3,331 °C)±72 K. The star's concentration of heavy elements is similar to that of the Sun.^[6]

Planetary system

In 2014, a planet named Gliese 27.1 b with an orbital period of 16 days was announced. It was discovered using the radial velocity method.^[7] The planetary equilibrium temperature is 406 K (271 °F; 133 °C).^[5] The planet's existence was doubted until 2020 because the putative orbital period is equal to half of the star's rotational period.^[2]

The Gliese 27.1 planetary system^[5]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b (disputed)	> 13^+4.1 _−6.6 M_⊕	0.101^+0.009 _−0.013	15.8190^+0.0049 _−0.0026	—	—	>3.63 R_⊕

References

^ ^a ^b ^c "CD-44 170". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-04-26.
^ ^a ^b ^c ^d Feng, Fabo; Butler, R. Paul; Shectman, Stephen A.; Crane, Jeffrey D.; Vogt, Steve; Chambers, John; Jones, Hugh R. A.; Wang, Sharon Xuesong; Teske, Johanna K.; Burt, Jenn; Díaz, Matías R.; Thompson, Ian B. (2020). "Search for Nearby Earth Analogs. II. Detection of Five New Planets, Eight Planet Candidates, and Confirmation of Three Planets around Nine Nearby M Dwarfs". The Astrophysical Journal Supplement Series. 246 (1): 11. arXiv:2001.02577. Bibcode:2020ApJS..246...11F. doi:10.3847/1538-4365/ab5e7c. S2CID 210064560.
^ ^a ^b ^c ^d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
^ Newton, Elisabeth R.; Irwin, Jonathan; Charbonneau, David; Berta-Thompson, Zachory K.; Dittmann, Jason A. (2016). "The Impact of Stellar Rotation on the Detectability of Habitable Planets Around M Dwarfs". The Astrophysical Journal. 821 (1): L19. arXiv:1604.03135. Bibcode:2016ApJ...821L..19N. doi:10.3847/2041-8205/821/1/L19. S2CID 73538034.
^ ^a ^b ^c Martínez-Rodríguez, Héctor; Caballero, José Antonio; Cifuentes, Carlos; Piro, Anthony L.; Barnes, Rory (2019). "Exomoons in the Habitable Zones of M Dwarfs". The Astrophysical Journal. 887 (2): 261. arXiv:1910.12054. Bibcode:2019ApJ...887..261M. doi:10.3847/1538-4357/ab5640. S2CID 204904780.
^ ^a ^b ^c Kuznetsov, M. K.; Del Burgo, C.; Pavlenko, Ya. V.; Frith, J. (2019). "Characterization of a Sample of Southern M Dwarfs Using Harps and X-shooter Spectra". The Astrophysical Journal. 878 (2): 134. Bibcode:2019ApJ...878..134K. doi:10.3847/1538-4357/ab1fe9.
^ Tuomi, Mikko; Jones, Hugh R. A.; Barnes, John R.; Anglada-Escudé, Guillem; Jenkins, James S. (2014). "Bayesian search for low-mass planets around nearby M dwarfs – estimates for occurrence rate based on global detectability statistics". Monthly Notices of the Royal Astronomical Society. 441 (2): 1545–1569. arXiv:1403.0430. doi:10.1093/mnras/stu358.

Constellation of Phoenix

Stars

Bayer	α (Ankaa) β γ δ ε ζ (Wurren) η θ ι κ λ¹ λ² μ ν ξ π ρ σ τ υ φ χ ψ ω
Variable	RV SX YZ AD AE AI AW AZ BB BD
HR	6 23 73 109 111 120 140 148 162 171 198 202 209 229 299 350 408 411 443 447 519 524 537 574 588 632 636 659 686 698 706 8910 8920 8929 8959 8993 9001 9046 9077 9082
HD	2039 5388 6434 (Nenque) 8535 9895 11421 13218 13387 223549 224782
Other	CD-44 170 BPM 30551 HE 0107-5240 NGC 405 WASP-4 WASP-5 WASP-18 WASP-29 WASP-96 WD 2359-434