| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco [1] |
| Right ascension | 17h 12m 23.204816s [2] |
| Declination | +63° 21′ 07.531205″ [2] |
| Apparent magnitude (V) | 8.167±0.013 [3] |
| Characteristics | |
| Evolutionary stage | main-sequence [4] |
| Spectral type | K0 [3] or G6 [4] |
| Apparent magnitude (R) | 7.60 [1] |
| Apparent magnitude (G) | 7.8657 [2] |
| Apparent magnitude (J) | 6.677±0.018 [1] |
| B−V color index | 0.801±0.014 [1] |
| Astrometry | |
| Radial velocity (Rv) | −20.144±0.161 [5] km/s |
| Proper motion (μ) |
RA: −1.879±0.024
mas/
yr
[2] Dec.: 160.429±0.027 mas/ yr [2] |
| Parallax (π) | 27.6756 ± 0.0200 mas [2] |
| Distance | 117.85 ± 0.09
ly (36.13 ± 0.03 pc) |
| Absolute magnitude (MV) | 5.25 [1] |
| Details | |
| Mass | 0.93±0.02 [6] M☉ |
| Radius | 0.94±0.02 [6] R☉ |
| Luminosity | 0.70±0.01 [6] L☉ |
| Surface gravity (log g) | 4.45±0.03 [6] cgs |
| Temperature | 5,449±31 [6] K |
| Metallicity [Fe/H] | 0.14±0.01 [3] dex |
| Rotational velocity (v sin i) | 2.51±1 [4] km/s |
| Age | 7.4±2.2 [6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 156279 is a star with a pair of orbiting exoplanets [8] located in the northern constellation of Draco. [1] It has various alternate designations, including HIP 84171 and BD+63 1335. Parallax measurements yield a distance of 118 light years from the Sun, [2] but it is drifting closer with a radial velocity of −20 km/s. [5] Despite an absolute magnitude of 5.25, [1] at that distance the star is too faint to be visible to the naked eye with an apparent visual magnitude of 8.17. [3] It is presumed to be a single star, as in 2019 all imaging surveys have failed to find any stellar companions. [3]
The spectrum of HD 156279 has a stellar classification of G6 [4] or K0, [3] depending on the study. Hence it presents as an ordinary main sequence star [4] of the late G-type or early K-type. The star has 93% of the mass of the Sun and 94% of the Sun's radius. HD 156279 is roughly seven [6] billion years old and is spinning with a projected rotational velocity of 2.5 km/s. [4] Based on the abundance of iron, this star is slightly enriched in heavy elements, having 140% of the solar abundance. [3] It is radiating 70% [6] of the luminosity of the Sun from its photosphere at an effective temperature of 5,449 K. [6]
Planetary system
Orbiting HD 156279 are two superjovian planets, the inner HD 156279 b (discovered in 2011) [4] and outer HD 156279 c (discovered in 2016). [8] In 2022, the inclination and true mass of HD 156279 c were measured via astrometry. [9]
| Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥ 9.50+0.31 −0.32 MJ |
0.5041+0.0082 −0.0085 |
133.4031+0.0037 −0.0040 |
0.64779+0.00068 −0.00066 |
— | — |
| c | 9.750+1.319 −0.605 MJ |
5.486+0.219 −0.240 |
4818.3+44.5 −43.1 |
0.261±0.006 | 74.699+36.999 −10.533 ° |
— |
References
- ^ a b c d e f g 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.
- ^ a b c d e f 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.
- ^ a b c d e f g Biller, B.; et al. (2019), "A high binary fraction for the most massive close-in giant planets and brown dwarf desert members", Monthly Notices of the Royal Astronomical Society, 485 (4): 4967–4996, arXiv: 1903.02332, Bibcode: 2019MNRAS.485.4967F, doi: 10.1093/mnras/stz671, S2CID 84180618.
- ^ a b c d e f g Díaz, Rodrigo F.; et al. (2012), "The SOPHIE search for northern extrasolar planets IV. Massive companions in the planet-brown dwarf boundary", Astronomy & Astrophysics, A113: 538, arXiv: 1111.1168, Bibcode: 2012A&A...538A.113D, doi: 10.1051/0004-6361/201117935, S2CID 55322205.
- ^ a b Carrera, R.; et al. (February 2022), "OCCASO. IV. Radial velocities and open cluster kinematics", Astronomy & Astrophysics, 658, arXiv: 2110.02110, Bibcode: 2022A&A...658A..14C, doi: 10.1051/0004-6361/202141832, A14.
- ^ a b c d e f g h i Bonfanti, A.; et al. (2016), "Age consistency between exoplanet hosts and field stars", Astronomy & Astrophysics, 585: 14, arXiv: 1511.01744, Bibcode: 2016A&A...585A...5B, doi: 10.1051/0004-6361/201527297, S2CID 53971692, A5.
- ^ "HD 156279". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 13 October 2020.
- ^ a b Bryan, Marta L.; et al. (2016), "Statistics of long period gas giant planets in known planetary systems", The Astrophysical Journal, 821 (2): 89, arXiv: 1601.07595, Bibcode: 2016ApJ...821...89B, doi: 10.3847/0004-637X/821/2/89, S2CID 19709252.
- ^ a b Feng, Fabo; Butler, R. Paul; et al. (August 2022), "3D Selection of 167 Substellar Companions to Nearby Stars", The Astrophysical Journal Supplement Series, 262 (21): 21, arXiv: 2208.12720, Bibcode: 2022ApJS..262...21F, doi: 10.3847/1538-4365/ac7e57, S2CID 251864022.
- ^ "HD 156279 Overview", NASA Exoplanet Archive, California Institute of Technology, retrieved 2024-01-10.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco [1] |
| Right ascension | 17h 12m 23.204816s [2] |
| Declination | +63° 21′ 07.531205″ [2] |
| Apparent magnitude (V) | 8.167±0.013 [3] |
| Characteristics | |
| Evolutionary stage | main-sequence [4] |
| Spectral type | K0 [3] or G6 [4] |
| Apparent magnitude (R) | 7.60 [1] |
| Apparent magnitude (G) | 7.8657 [2] |
| Apparent magnitude (J) | 6.677±0.018 [1] |
| B−V color index | 0.801±0.014 [1] |
| Astrometry | |
| Radial velocity (Rv) | −20.144±0.161 [5] km/s |
| Proper motion (μ) |
RA: −1.879±0.024
mas/
yr
[2] Dec.: 160.429±0.027 mas/ yr [2] |
| Parallax (π) | 27.6756 ± 0.0200 mas [2] |
| Distance | 117.85 ± 0.09
ly (36.13 ± 0.03 pc) |
| Absolute magnitude (MV) | 5.25 [1] |
| Details | |
| Mass | 0.93±0.02 [6] M☉ |
| Radius | 0.94±0.02 [6] R☉ |
| Luminosity | 0.70±0.01 [6] L☉ |
| Surface gravity (log g) | 4.45±0.03 [6] cgs |
| Temperature | 5,449±31 [6] K |
| Metallicity [Fe/H] | 0.14±0.01 [3] dex |
| Rotational velocity (v sin i) | 2.51±1 [4] km/s |
| Age | 7.4±2.2 [6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 156279 is a star with a pair of orbiting exoplanets [8] located in the northern constellation of Draco. [1] It has various alternate designations, including HIP 84171 and BD+63 1335. Parallax measurements yield a distance of 118 light years from the Sun, [2] but it is drifting closer with a radial velocity of −20 km/s. [5] Despite an absolute magnitude of 5.25, [1] at that distance the star is too faint to be visible to the naked eye with an apparent visual magnitude of 8.17. [3] It is presumed to be a single star, as in 2019 all imaging surveys have failed to find any stellar companions. [3]
The spectrum of HD 156279 has a stellar classification of G6 [4] or K0, [3] depending on the study. Hence it presents as an ordinary main sequence star [4] of the late G-type or early K-type. The star has 93% of the mass of the Sun and 94% of the Sun's radius. HD 156279 is roughly seven [6] billion years old and is spinning with a projected rotational velocity of 2.5 km/s. [4] Based on the abundance of iron, this star is slightly enriched in heavy elements, having 140% of the solar abundance. [3] It is radiating 70% [6] of the luminosity of the Sun from its photosphere at an effective temperature of 5,449 K. [6]
Planetary system
Orbiting HD 156279 are two superjovian planets, the inner HD 156279 b (discovered in 2011) [4] and outer HD 156279 c (discovered in 2016). [8] In 2022, the inclination and true mass of HD 156279 c were measured via astrometry. [9]
| Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥ 9.50+0.31 −0.32 MJ |
0.5041+0.0082 −0.0085 |
133.4031+0.0037 −0.0040 |
0.64779+0.00068 −0.00066 |
— | — |
| c | 9.750+1.319 −0.605 MJ |
5.486+0.219 −0.240 |
4818.3+44.5 −43.1 |
0.261±0.006 | 74.699+36.999 −10.533 ° |
— |
References
- ^ a b c d e f g 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.
- ^ a b c d e f 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.
- ^ a b c d e f g Biller, B.; et al. (2019), "A high binary fraction for the most massive close-in giant planets and brown dwarf desert members", Monthly Notices of the Royal Astronomical Society, 485 (4): 4967–4996, arXiv: 1903.02332, Bibcode: 2019MNRAS.485.4967F, doi: 10.1093/mnras/stz671, S2CID 84180618.
- ^ a b c d e f g Díaz, Rodrigo F.; et al. (2012), "The SOPHIE search for northern extrasolar planets IV. Massive companions in the planet-brown dwarf boundary", Astronomy & Astrophysics, A113: 538, arXiv: 1111.1168, Bibcode: 2012A&A...538A.113D, doi: 10.1051/0004-6361/201117935, S2CID 55322205.
- ^ a b Carrera, R.; et al. (February 2022), "OCCASO. IV. Radial velocities and open cluster kinematics", Astronomy & Astrophysics, 658, arXiv: 2110.02110, Bibcode: 2022A&A...658A..14C, doi: 10.1051/0004-6361/202141832, A14.
- ^ a b c d e f g h i Bonfanti, A.; et al. (2016), "Age consistency between exoplanet hosts and field stars", Astronomy & Astrophysics, 585: 14, arXiv: 1511.01744, Bibcode: 2016A&A...585A...5B, doi: 10.1051/0004-6361/201527297, S2CID 53971692, A5.
- ^ "HD 156279". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 13 October 2020.
- ^ a b Bryan, Marta L.; et al. (2016), "Statistics of long period gas giant planets in known planetary systems", The Astrophysical Journal, 821 (2): 89, arXiv: 1601.07595, Bibcode: 2016ApJ...821...89B, doi: 10.3847/0004-637X/821/2/89, S2CID 19709252.
- ^ a b Feng, Fabo; Butler, R. Paul; et al. (August 2022), "3D Selection of 167 Substellar Companions to Nearby Stars", The Astrophysical Journal Supplement Series, 262 (21): 21, arXiv: 2208.12720, Bibcode: 2022ApJS..262...21F, doi: 10.3847/1538-4365/ac7e57, S2CID 251864022.
- ^ "HD 156279 Overview", NASA Exoplanet Archive, California Institute of Technology, retrieved 2024-01-10.