HD 175541
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Serpens |
| Right ascension | 18h 55m 40.884s[1] |
| Declination | +04° 15′ 55.17″[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: -6.82 ± 1.01[1] mas/yr Dec.: -89.23 ± 0.79[1] mas/yr |
| Parallax (π) | 7.87 ± 0.95[1] mas |
| Distance | approx. 410 ly (approx. 130 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 |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
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 410 light years from Earth. Despite its distance of over 100 ly, It was given the number 736 in the Gliese Catalogue of Nearby Stars.
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), USA.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >0.61 MJ | 1.03 | 297.3 ± 6 | 0.33 ± 0.2 | — | — |
See also
References
- 1 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
- 1 2 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.
Coordinates: 
18h 55m 40.8837s, +04° 15′ 55.169″
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