HD 181433

HD 181433
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Pavo
Right ascension	19h 25m 09.5663s
Declination	−66° 28′ 07.671″
Apparent magnitude (V)	8.38
Characteristics
Spectral type	K5V
B−V color index	1.04
Astrometry
Radial velocity (Rv)	+37.9 km/s
Proper motion (μ)	RA: –230.60 mas/yr ; Dec.: 235.37 mas/yr
Parallax (π)	37.37 ± 1.13 mas
Distance	87 ± 3 ly ; (26.8 ± 0.8 pc)
Absolute magnitude (MV)	6.26
Details
Mass	0.86 ± 0.06 M☉
Surface gravity (log g)	4.57 ± 0.04 cgs
Temperature	4902 ± 41 K
Metallicity [Fe/H]	0.65 dex
Age	6.7 ± 1.8 Gyr
Other designations
	CD−66° 2307, GJ 756.1, HIP 95467, SAO 254563
Database references
SIMBAD	data
Exoplanet Archive	data
Extrasolar Planets; Encyclopaedia	data

HD 181433 is a star located approximately 87 light-years away^[3]^{[note 1]} in the constellation of Pavo (the Peacock). According to SIMBAD, it has a stellar classification of K3III-IV,^[1] which puts it on the borderline between being a red giant and a subgiant. This is inconsistent with the fact that its luminosity is only 0.308 times that of the Sun.^[6] Its entry in the Hipparcos catalogue lists a spectral type of K5V,^[2] classifying it as a dwarf star. As of 2008, three extrasolar planets are thought to be orbiting the star.^[7] There is currently little information on these planets. The name of this star comes from its identifier in the Henry Draper catalogue.

Planetary system[]

Orbiting the star are three planets, whose discovery was announced in 2008;^[8] the discovery paper was published in 2009.^[6] The inner planet has a mass at least 7.5 times that of Earth, and is termed a super-Earth (this classification is based solely on the mass of the planet and should not be taken to imply that the planet could support Earthlike conditions). The middle planet and the outer planet are gas giants. The orbital periods for three planets are 9.3743 days for a 7.56 M_E planet, 962 days for a 0.64 M_J planet, and 2172 days for a 0.54 M_J planet.^[6] This solution is unstable, more data are required to constrain the orbital position of planet d.^[9]

Diagram of the (probable) HD 181433 Star System.

The HD 181433 planetary system^[6]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	≥0.0238 M_J	0.080	9.3743 ± 0.0019	0.396 ± 0.062	—	—
c	≥0.64 M_J	1.76	962 ± 15	0.28 ± 0.02	—	—
d	≥0.54 M_J	3.00	2172 ± 158	0.48 ± 0.05	—	—

Notes[]

^ Calculated from parallax: $\textstyle \mathrm {Distance\ in\ parsecs} ={\frac {1000}{\mathrm {parallax\ in\ milliarcseconds} }}$

References[]

^ Jump up to: ^a ^b ^c ^d ^e ^f "NLTT 47732 -- High proper-motion star". SIMBAD. Retrieved 2008-10-02.
^ Jump up to: ^a ^b ESA (1997). "HIP 95152". The Hipparcos and Tycho Catalogues: The Hipparcos Main Catalogue. Retrieved 2008-10-02.
^ Jump up to: ^a ^b ^c ^d van Leeuwen, F. (2007). "HIP 95152". Hipparcos, the New Reduction: The Astrometric Catalogue. Retrieved 2008-10-02.
^ 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, S2CID 119257644.
^ Jump up to: ^a ^b ^c ^d ^e Trevisan, M.; et al. (November 2011), "Analysis of old very metal rich stars in the solar neighbourhood", Astronomy & Astrophysics, 535: A42, arXiv:1109.6304, Bibcode:2011A&A...535A..42T, doi:10.1051/0004-6361/201016056, S2CID 49565866. See table 13.
^ Jump up to: ^a ^b ^c ^d Bouchy, F.; et al. (2009). "The HARPS search for southern extra-solar planets. XVII. Super-Earth and Neptune-mass planets in multiple planet systems HD 47186 and HD 181433". Astronomy and Astrophysics. 496 (2): 527–531. arXiv:0812.1608. Bibcode:2009A&A...496..527B. doi:10.1051/0004-6361:200810669. S2CID 117778593.
^ "A Trio of Super-Earths" (Press release). ESO. 2008-06-16. Archived from the original on 2008-10-07. Retrieved 2008-10-02.
^ "Astronomers find batch of "Super Earths"". BT Yahoo.com. Archived from the original on 2008-06-17. Retrieved 2008-06-16.
^ Campanella, G. (2011). "Treating dynamical stability as an observable: a 5:2 MMR configuration for the extrasolar system HD 181433". MNRAS. 418 (2): 1028–1038. arXiv:1108.0360. Bibcode:2011MNRAS.418.1028C. doi:10.1111/j.1365-2966.2011.19553.x.

External links[]

"CD-66 2307 / HD 181433". SolStation. Retrieved 2008-06-21.
"HD 181433". Exoplanets. Archived from the original on 2012-03-18. Retrieved 2008-12-15.

Coordinates: 19^h 25^m 09.5663^s, −66° 28′ 07.671″

[parallax-6] Calculated from parallax: $\textstyle \mathrm {Distance\ in\ parsecs} ={\frac {1000}{\mathrm {parallax\ in\ milliarcseconds} }}$

[simbad-1] Jump up to: ^a ^b ^c ^d ^e ^f "NLTT 47732 -- High proper-motion star". SIMBAD. Retrieved 2008-10-02.

[esa97-2] Jump up to: ^a ^b ESA (1997). "HIP 95152". The Hipparcos and Tycho Catalogues: The Hipparcos Main Catalogue. Retrieved 2008-10-02.

[vanleeuwen07-3] Jump up to: ^a ^b ^c ^d van Leeuwen, F. (2007). "HIP 95152". Hipparcos, the New Reduction: The Astrometric Catalogue. Retrieved 2008-10-02.

[Anderson2012-4] 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, S2CID 119257644.

[aaa535_A42-5] Jump up to: ^a ^b ^c ^d ^e Trevisan, M.; et al. (November 2011), "Analysis of old very metal rich stars in the solar neighbourhood", Astronomy & Astrophysics, 535: A42, arXiv:1109.6304, Bibcode:2011A&A...535A..42T, doi:10.1051/0004-6361/201016056, S2CID 49565866. See table 13.

[bouchy2009-7] Jump up to: ^a ^b ^c ^d Bouchy, F.; et al. (2009). "The HARPS search for southern extra-solar planets. XVII. Super-Earth and Neptune-mass planets in multiple planet systems HD 47186 and HD 181433". Astronomy and Astrophysics. 496 (2): 527–531. arXiv:0812.1608. Bibcode:2009A&A...496..527B. doi:10.1051/0004-6361:200810669. S2CID 117778593.

[eso-8] "A Trio of Super-Earths" (Press release). ESO. 2008-06-16. Archived from the original on 2008-10-07. Retrieved 2008-10-02.

[yahoo-9] "Astronomers find batch of "Super Earths"". BT Yahoo.com. Archived from the original on 2008-06-17. Retrieved 2008-06-16.

[campanella-10] Campanella, G. (2011). "Treating dynamical stability as an observable: a 5:2 MMR configuration for the extrasolar system HD 181433". MNRAS. 418 (2): 1028–1038. arXiv:1108.0360. Bibcode:2011MNRAS.418.1028C. doi:10.1111/j.1365-2966.2011.19553.x.

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Observation data Epoch J2000.0 Equinox J2000.0
Constellation	Pavo
Right ascension	19^h 25^m 09.5663^s^[1]
Declination	−66° 28′ 07.671″^[1]
Apparent magnitude (V)	8.38^[1]
Characteristics
Spectral type	K5V^[2]
B−V color index	1.04^[1]
Astrometry

Radial velocity (R_v)	+37.9^[1] km/s
Proper motion (μ)	RA: –230.60^[3] mas/yr Dec.: 235.37^[3] mas/yr
Parallax (π)	37.37 ± 1.13^[3] mas
Distance	87 ± 3 ly (26.8 ± 0.8 pc)
Absolute magnitude (M_V)	6.26^[4]

Details

Mass	0.86 ± 0.06^[5] `M`_☉
Surface gravity (log g)	4.57 ± 0.04^[5] cgs
Temperature	4902 ± 41^[5] K
Metallicity [Fe/H]	0.65^[5] dex
Age	6.7 ± 1.8^[5] Gyr

Other designations
CD−66° 2307, GJ 756.1, HIP 95467, SAO 254563
Database references
SIMBAD	data
Exoplanet Archive	data
Extrasolar Planets Encyclopaedia	data

show v t HD 181433 system
Stars	HD 181433
Planets	HD 181433 b HD 181433 c HD 181433 d

HD 181433

Contents

Planetary system[]

See also[]

Notes[]

References[]

External links[]