HD 175541
HD 175541 is an intermediate-mass subgiant star in the constellation Serpens. That means when this star was a main-sequence, it was an A-type star. It is an 8th magnitude star about 424 light years from Earth. Despite its distance of over 100 ly, It was given the number 736 in the Gliese Catalogue of Nearby Stars.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Serpens |
| Right ascension | 18h 55m 40.8840s[1] |
| Declination | +04° 15′ 55.1623″[1] |
| Apparent magnitude (V) | 8.03 |
| Characteristics | |
| Spectral type | G8IV |
| U−B color index | 0.56 |
| B−V color index | 0.9 |
| R−I color index | 0.33 |
| Astrometry | |
| Radial velocity (Rv) | 18.4 ± 2 km/s |
| Proper motion (μ) | RA: −6.744±0.099[1] mas/yr Dec.: −90.226±0.084[1] mas/yr |
| Parallax (π) | 7.6877 ± 0.0595[1] mas |
| Distance | 424 ± 3 ly (130 ± 1 pc) |
| Absolute magnitude (MV) | 2.50 |
| Details | |
| Mass | 1.65 M☉ |
| Radius | 3.85 R☉ |
| Surface gravity (log g) | 3.72 g cgs |
| Temperature | 5060 ± 44 K |
| Metallicity | -7 ± 4 % |
| Age | 1.9 ± 1 G years |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
| Extrasolar Planets Encyclopaedia | data |
The star HD 175541 is named Kaveh. The name was selected in the NameExoWorlds campaign by Iran, during the 100th anniversary of the IAU. Kaveh is one of the heroes of Shahnameh.[3][4]
In April 2007, the planet was found orbiting around one of the three preferred intermediate-mass subgiants that has changes in radial velocity trends, from Lick and Keck Observatories in Mount Hamilton (California) and Mauna Kea (Hawai'i), United States.[5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥0.598±0.029 MJ | 0.975±0.087 | 298.43±0.45 | 0.110±0.049 | — | — |
References
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- "HD 175541". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-11.
- "Approved names". NameExoworlds. Retrieved 2020-01-02.
- "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
- Johnson, John Asher; et al. (2007). "Retired A Stars and Their Companions: Exoplanets Orbiting Three Intermediate-Mass Subgiants". The Astrophysical Journal. 665 (1): 785–793. arXiv:0704.2455. Bibcode:2007ApJ...665..785J. doi:10.1086/519677.
- Luhn, Jacob K.; et al. (2019). "Retired A Stars and Their Companions. VIII. 15 New Planetary Signals around Subgiants and Transit Parameters for California Planet Search Planets with Subgiant Hosts". The Astronomical Journal. 157 (4). 149. arXiv:1811.03043. Bibcode:2019AJ....157..149L. doi:10.3847/1538-3881/aaf5d0.
- "GJ 736". webviz.u-strasbg.fr/.