HD 154672

Coordinates: Sky map 17h 10m 04.9121s, −56° 26′ 57.364″
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HD
154672
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ara
Right ascension 17h 10m 04.912s[1]
Declination −56° 26′ 57.38″[1]
Apparent magnitude (V) 8.22[2]
Characteristics
Spectral type G3 IV
B−V color index 0.71
Distance
210 ± 10 ly
(65 ± 4 pc)
Absolute magnitude (MV)4.12[3]
Details
Mass1.06 +0.11
−0.09[2] M☉
Radius1.27 +0.1
−0.09[2] R☉
Luminosity1.88[3] L☉
Temperature5714 (± 30)[2] K
Metallicity+0.26 (± 0.04)[2]
Age9.28 +2.18
−2.36[2] years
HIP 83983, SAO
 244476
Database references
SIMBADdata

HD 154672 is a yellow

Doppler Spectroscopy; the discovery was reported in October 2008.[3] The N2K collaboration chose HD 154672 primarily because it aimed to discover the correlation between a star's metallicity and the mass of orbiting planets.[3]

HD 154672 was targeted by the Magellan Telescopes. It is the host of the first planet discovered from the telescopes by N2K.[3]

Observational history

HD 154672 was first targeted for a planet search in 2004 by the

Henry Draper catalog and the catalog of the European Space Agency's Hipparcos satellite.[3]

The Magellan Telescopes, which were used to observe HD 154672.

N2K deliberately biased its search towards closely orbiting Jupiter-size planets (Hot Jupiters) in the orbit of metal-rich stars, as the consortium hoped to discover how the mass of a planet relates to its host star's metal content.[3] Initially, HD 154672 was noted as a host to a short-orbit Hot Jupiter, although additional observations revealed that the prospective planetary body had a longer orbit than previously expected, as revealed by the Magellan Telescopes at Chile's Las Campanas Observatory.[3]

Use of the Magellan Clay telescope's Magellan Inamori Kyocera Echelle spectrograph (MIKE) helped collect sixteen radial velocity measurements for HD 154672; a team of American astronomers and one from the Vatican City used these measurements to confirm the existence of planet HD 154672 b and to determine its mass.[3]

The discovery of HD 154672's planet was reported in the

Astronomical Journal on October 7, 2008 along with a planet in the orbit of HD 205739.[3]

Host star

HD 154672 is a sunlike

gyrochronological age is estimated at 9.28 billion years.[2] HD 154672's spectrum suggests that the star's chromosphere (its outer layer) is not active.[3]

HD 154672 is located 65.8

light years) away from Earth. It has an apparent magnitude (V) of 8.22, making the star too dim to see from Earth with the naked eye.[2] The star is slightly dimmer than planet Neptune as perceived with the naked eye, which has an apparent magnitude of 7.78 at its brightest.[4] The star's actual brightness is measured with an absolute magnitude of 4.12,[3]
similar to that of the Sun.

Planetary system

Main article: HD 154672 b

HD 154672 b is a

mean distance between the Earth and Sun. This orbit is completed every 163.91 days.[2]

HD 154672 b has an orbital eccentricity of 0.61, denoting a very elliptical orbit.[2] The planet's discoverers noted that if water existed in the planet's atmosphere, it might change from a liquid state to a gaseous state as the planet swings closer to its host star, increasing its temperature.[3]

The HD 154672 planetary system[3]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b >4.96 MJ 0.597 163.94 ± 0.01 0.61 ± 0.03 — —

See also

References

  1. ^
    S2CID 18759600. Vizier catalog entry
  2. ^ a b c d e f g h i j k Jean Schneider (2009). "Notes for star HD 154672". Extrasolar Planets Encyclopaedia. Archived from the original on September 28, 2008. Retrieved 23 May 2011.
  3. ^
    S2CID 119242543
    .
  4. ^ David R. Williams (17 November 2010). "Neptune Fact Sheet". Goddard Space Flight Center. NASA. Retrieved 23 May 2011.


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