| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 14 21 23.186 |
| Declination | −40° 23′ 38.22″ |
| Apparent magnitude (V) | 9.03 |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | K4V(k) |
| Apparent magnitude (B) | 10.137 |
| Apparent magnitude (J) | 7.097±0.021 |
| Apparent magnitude (H) | 6.608±0.026 |
| Apparent magnitude (K) | 6.447±0.023 |
| B−V color index | 1.107±0.006 |
| Astrometry | |
| Radial velocity (Rv) | +4.48±0.45 km/s |
| Proper motion (μ) | RA: −561.636 mas/yr Dec.: −68.516 mas/yr |
| Parallax (π) | 35.4337 ± 0.0762 mas |
| Distance | 92.0 ± 0.2 ly (28.22 ± 0.06 pc) |
| Absolute magnitude (MV) | 6.80 |
| Details | |
| Mass | 0.77 M☉ |
| Radius | 0.73+0.02 −0.03 R☉ |
| Luminosity | 0.241 L☉ |
| Surface gravity (log g) | 4.58 cgs |
| Temperature | 4,672 K |
| Metallicity | 0.13 dex |
| Rotation | 37.2±2.0 d |
| Rotational velocity (v sin i) | 1.50 km/s |
| Age | 8.17 Gyr |
| Other designations | |
| CD−39°8857, GJ 545.1, HD 125595, HIP 70170, PPM 319432, LHS 2900, LPM 523, LTT 5648, NLTT 37029, GCRV 64739 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 125595 is a star with a close Neptunian companion in the southern constellation of Centaurus. With an apparent visual magnitude of 9.03, this star is too faint to be viewed with the naked eye. It is located at a distance of 92 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +4.5 km/s. The star has a high proper motion, traversing the celestial sphere and an angular rate of 0.57 arcsecond yr.
This is an ordinary K-type main-sequence star with a stellar classification of K4V(k), which indicates it is a small star that is generating energy at its core through hydrogen fusion. It is about eight billion years old and is spinning with a projected rotational velocity of 1.5 km/s, giving it a 37 day rotation period. The star shows a moderate level of chromospherically activity due to star spots or plagues. It is smaller, cooler, dimmer, and less massive than the Sun, but shows a higher atmospheric metallicity.
Planetary system
In 2018 an exoplanet companion was announced by the HARPS program, using the radial velocity method. It is a Neptune-mass object orbiting 0.081 AU (12.1 Gm) from the host star with a period of 9.7 days.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥ 0.042±0.004 MJ | 0.0809±0.0014 | 9.6737±0.0039 | 0.0 | — | — |
See also
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.
- ^ 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.
- ^ Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2006-07-01). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. ISSN 0004-6256. S2CID 119476992.
- ^ Luck, R. Earle (March 2018). "Abundances in the Local Region. III. Southern F, G, and K Dwarfs". The Astronomical Journal. 155 (3): 31. Bibcode:2018AJ....155..111L. doi:10.3847/1538-3881/aaa9b5. S2CID 125765376. 111.
- ^ Suárez Mascareño, A.; et al. (September 2015). "Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators". Monthly Notices of the Royal Astronomical Society. 452 (3): 2745–2756. arXiv:1506.08039. Bibcode:2015MNRAS.452.2745S. doi:10.1093/mnras/stv1441. S2CID 119181646.
- ^ Ségransan, D.; et al. (2011). "The HARPS search for southern extra-solar planets. XXIX. Four new planets in orbit around the moderately active dwarfs HD 63765, HD 104067, HD 125595, and HIP 70849". Astronomy and Astrophysics. 535. A54. arXiv:1107.0339. Bibcode:2011A&A...535A..54S. doi:10.1051/0004-6361/200913580. S2CID 119197766.
- Bakos, Gáspár Á.; et al. (July 2002). "Revised Coordinates and Proper Motions of the Stars in the Luyten Half-Second Catalog". The Astrophysical Journal Supplement Series. 141 (1): 187–193. arXiv:astro-ph/0202164. Bibcode:2002ApJS..141..187B. doi:10.1086/340115. S2CID 36667868.
