Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Scutum [1] |
Right ascension | 18h 33m 28.832s [2] |
Declination | −11° 38′ 09.72″ [2] |
Apparent magnitude (V) | 9.99±0.05 [3] |
Characteristics | |
Evolutionary stage | main sequence [3] |
Spectral type | K7 V [4] [3] |
Apparent magnitude (B) | 11.21±0.10 [3] |
Apparent magnitude (J) | 7.651±0.023 [1] |
B−V color index | 1.263±0.009 [1] |
Astrometry | |
Radial velocity (Rv) | −87.515±0.0011 [5] km/s |
Proper motion (μ) |
RA: −288.440
mas/
yr
[2] Dec.: −235.615 mas/ yr [2] |
Parallax (π) | 36.7534 ± 0.0157 mas [2] |
Distance | 88.74 ± 0.04
ly (27.21 ± 0.01 pc) |
Details | |
Mass | 0.651+0.031 −0.029 [3] M☉ |
Radius | 0.639+0.020 −0.022 [3] R☉ |
Luminosity | 0.157+0.019 −0.017 [3] L☉ |
Surface gravity (log g) | 4.642+0.027 −0.025 [3] cgs |
Temperature | 4,550±110 [3] K |
Metallicity [Fe/H] | −0.48±0.07 [6] dex |
Rotation | ~25 d [3] |
Rotational velocity (v sin i) | 1.0±0.5 [3] km/s |
Age | 7.4+4.5 −4.9 [3] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
BD−11 4672 is a single star with a pair of orbiting exoplanets in the southern constellation of Scutum, the shield. The designation BD−11 4672 comes from the Bonner Durchmusterung star catalogue, which was published during the nineteenth century in Germany. With an apparent visual magnitude of 9.99, [3] the star is much too faint to be viewed with the naked eye. It is located at a distance of 89 light years from the Sun, as determined from parallax, [2] but is drifting closer with a radial velocity of −87.5 km/s. [5] This was recognised as a high proper motion star by German astronomer Max Wolf in 1924 [8] and is traversing the celestial sphere at an angular rate of 0.401 arcsec yr−1. [9]
The spectrum of BD−11 4672 matches a K-type main-sequence star, an orange dwarf, with a stellar classification of K7 V. [4] Its age is not well constrained, but is probably older than the Sun. It is a metal-poor star, showing an iron abundance that is 35% of solar. [6] No significant flare activity was detected. [10] The star shows evidence of a Sun-like magnetic activity cycle with a period of 7–10 years. [3] It has 65% of the mass and 64% of the radius of the Sun. The star is radiating 16% of the luminosity of the Sun from its photosphere at an effective temperature of 4,550 K. [3]
In 2010, a team of astronomers led by astronomer C. Moutou of the High Accuracy Radial Velocity Planet Searcher performed a radial-velocity analysis, which led to the suspicion of a gas giant exoplanet in orbit around BD−11 4672. [4] The existence of this exoplanet was confirmed in 2014. [11] In 2020, a second exoplanet was detected on an interior and much more eccentric orbit near the inner edge of the Star's habitable zone. [3]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | >0.65±0.05 MJ | 2.36±0.04 | 1634±14 | 0.05±0.05 | — | — |
c | >0.04836+0.009 −0.0066 MJ |
0.3±0.01 | 74.2±0.08 | 0.4±0.15 | — | — |
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Scutum [1] |
Right ascension | 18h 33m 28.832s [2] |
Declination | −11° 38′ 09.72″ [2] |
Apparent magnitude (V) | 9.99±0.05 [3] |
Characteristics | |
Evolutionary stage | main sequence [3] |
Spectral type | K7 V [4] [3] |
Apparent magnitude (B) | 11.21±0.10 [3] |
Apparent magnitude (J) | 7.651±0.023 [1] |
B−V color index | 1.263±0.009 [1] |
Astrometry | |
Radial velocity (Rv) | −87.515±0.0011 [5] km/s |
Proper motion (μ) |
RA: −288.440
mas/
yr
[2] Dec.: −235.615 mas/ yr [2] |
Parallax (π) | 36.7534 ± 0.0157 mas [2] |
Distance | 88.74 ± 0.04
ly (27.21 ± 0.01 pc) |
Details | |
Mass | 0.651+0.031 −0.029 [3] M☉ |
Radius | 0.639+0.020 −0.022 [3] R☉ |
Luminosity | 0.157+0.019 −0.017 [3] L☉ |
Surface gravity (log g) | 4.642+0.027 −0.025 [3] cgs |
Temperature | 4,550±110 [3] K |
Metallicity [Fe/H] | −0.48±0.07 [6] dex |
Rotation | ~25 d [3] |
Rotational velocity (v sin i) | 1.0±0.5 [3] km/s |
Age | 7.4+4.5 −4.9 [3] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
BD−11 4672 is a single star with a pair of orbiting exoplanets in the southern constellation of Scutum, the shield. The designation BD−11 4672 comes from the Bonner Durchmusterung star catalogue, which was published during the nineteenth century in Germany. With an apparent visual magnitude of 9.99, [3] the star is much too faint to be viewed with the naked eye. It is located at a distance of 89 light years from the Sun, as determined from parallax, [2] but is drifting closer with a radial velocity of −87.5 km/s. [5] This was recognised as a high proper motion star by German astronomer Max Wolf in 1924 [8] and is traversing the celestial sphere at an angular rate of 0.401 arcsec yr−1. [9]
The spectrum of BD−11 4672 matches a K-type main-sequence star, an orange dwarf, with a stellar classification of K7 V. [4] Its age is not well constrained, but is probably older than the Sun. It is a metal-poor star, showing an iron abundance that is 35% of solar. [6] No significant flare activity was detected. [10] The star shows evidence of a Sun-like magnetic activity cycle with a period of 7–10 years. [3] It has 65% of the mass and 64% of the radius of the Sun. The star is radiating 16% of the luminosity of the Sun from its photosphere at an effective temperature of 4,550 K. [3]
In 2010, a team of astronomers led by astronomer C. Moutou of the High Accuracy Radial Velocity Planet Searcher performed a radial-velocity analysis, which led to the suspicion of a gas giant exoplanet in orbit around BD−11 4672. [4] The existence of this exoplanet was confirmed in 2014. [11] In 2020, a second exoplanet was detected on an interior and much more eccentric orbit near the inner edge of the Star's habitable zone. [3]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | >0.65±0.05 MJ | 2.36±0.04 | 1634±14 | 0.05±0.05 | — | — |
c | >0.04836+0.009 −0.0066 MJ |
0.3±0.01 | 74.2±0.08 | 0.4±0.15 | — | — |