Summary
HD 330075 is a star in the southern constellation of Norma. It has a yellow hue and an apparent visual magnitude of 9.36,[2] which makes it too faint to be seen with the naked eye – it is visible only with telescope or powerful binoculars. Parallax measurements provide a distance estimate of 148 light years from the Sun, and it is drifting further away with a radial velocity of 62 km/s.[1] The star is estimated to have come as close as 111.5 light-years some 409 million years ago.[2]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Norma |
| Right ascension | 15h 49m 37.69382s[1] |
| Declination | –49° 57′ 48.6771″[1] |
| Apparent magnitude (V) | 9.36[2] |
| Characteristics | |
| Spectral type | G5[3] |
| B−V color index | 0.935±0.005[2] |
| Astrometry | |
| Radial velocity (Rv) | 61.67±0.24[1] km/s |
| Proper motion (μ) | RA: -232.760[1] mas/yr Dec.: -92.540[1] mas/yr |
| Parallax (π) | 22.0467 ± 0.0443 mas[1] |
| Distance | 147.9 ± 0.3 ly (45.36 ± 0.09 pc) |
| Absolute magnitude (MV) | 5.89[2] |
| Details | |
| Mass | 0.86±0.02[4] M☉ |
| Radius | 0.85+0.02 −0.03[1] R☉ |
| Luminosity | 0.393±0.001[1] L☉ |
| Surface gravity (log g) | 4.68±0.09[4] cgs |
| Temperature | 4,967+88 −65[1] K |
| Metallicity [Fe/H] | 0.18±0.04[4] dex |
| Age | 5.30±4.22[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This object appears to be a slightly evolved dwarf with a spectral class of G5. That is, it is nearing the end of its main sequence lifetimes and is becoming a subgiant star. The star has very low chromospheric activity and is around five billion years old.[3] It is smaller than the Sun with 86%[4] of the Sun's mass and 85%[1] of the solar radius. As a consequence, it is radiating just 39% of the luminosity of the Sun from its photosphere at an effective temperature of 4,967 K.[1] It has a super-solar metallicity, which means the abundance of elements other than hydrogen and helium appears much higher than in the Sun.[4]
Planetary system edit
In 2004, the discovery of a hot Jupiter planet orbiting close to the star was announced. This is the first planet discovered by the then-new HARPS spectrograph.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥ 0.76 MJ | 0.043 | 3.369±0.004 | 0 | — | — |
See also edit
References edit
- ^ a b c d e f g h i j k l 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.
- ^ a b c d e 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 Pepe, F.; et al. (2004). "The HARPS search for southern extra-solar planets I. HD 330075 b: A new "hot Jupiter"". Astronomy and Astrophysics. 423 (1): 385–389. arXiv:astro-ph/0405252. Bibcode:2004A&A...423..385P. doi:10.1051/0004-6361:20040389. S2CID 59157984.
- ^ a b c d e f Maldonado, J.; et al. (May 2018). "Chemical fingerprints of hot Jupiter planet formation". Astronomy & Astrophysics. 612: 18. arXiv:1712.01035. Bibcode:2018A&A...612A..93M. doi:10.1051/0004-6361/201732001. S2CID 119458710. A93.
- ^ "HD 330075". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-18.
External links edit
- "HD 330075". Exoplanets. Archived from the original on 2009-11-25. Retrieved 2009-05-22.