HD 121504
HD 121504 is an 8th magnitude star in the constellation of Centaurus. It is a yellow dwarf (spectral type G2V) and remarkably similar to our Sun, only slightly brighter like α Centauri A. However, it is located at a distance of about 135 light years and thus is not visible to the unaided eye; binoculars or small telescope is required to see this star.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 13h 57m 17.2388s[1] |
| Declination | −56° 02′ 24.159″[1] |
| Apparent magnitude (V) | 7.52[2] |
| Characteristics | |
| Spectral type | G2V[2] |
| B−V color index | 0.593[3] |
| Astrometry | |
| Proper motion (μ) | RA: −249.397±0.048[1] mas/yr Dec.: −84.656±0.056[1] mas/yr |
| Parallax (π) | 24.24 ± 0.25[1] mas |
| Distance | 135 ± 1 ly (41.3 ± 0.4 pc) |
| Details[3] | |
| Mass | 1.18 M☉ |
| Luminosity | 1.55 L☉ |
| Surface gravity (log g) | 4.64 cgs |
| Temperature | 6075 K |
| Metallicity [Fe/H] | 0.16 dex |
| Rotation | 8.6 days |
| Rotational velocity (v sin i) | 2.6 km/s |
| Age | 1.2 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Another component, designated as SAO 241323 has been proposed as a component of the system. However, the star is an optical binary component and in reality is a white giant star located thousands of light years away.
In 2000 the Geneva Extrasolar Planet Search Team announced the discovery of an extrasolar planet orbiting the star.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >1.22 MJ | 0.33 | 63.33 ± 0.03 | 0.03 ± 0.01 | — | — |
See also
- List of extrasolar planets
References
- Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512. S2CID 1828208.Gaia Data Release 1 catalog entry
- "HD 121504". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-04-03.
- Mayor, M.; et al. (2004). "The CORALIE survey for southern extra-solar planets XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE". Astronomy and Astrophysics. 415 (1): 391–402. arXiv:astro-ph/0310316. Bibcode:2004A&A...415..391M. doi:10.1051/0004-6361:20034250. S2CID 5233877.
- "European Southern Observatory: Six Extrasolar Planets Discovered". SpaceRef Interactive Inc. 7 August 2000. Retrieved 15 August 2009.
External links
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