Astronomy:HD 330075
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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 |
| Extrasolar Planets Encyclopaedia | data |
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]
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
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
- List of stars with extrasolar planets
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 3.2 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. doi:10.1051/0004-6361:20040389. Bibcode: 2004A&A...423..385P. http://www.aanda.org/index.php?option=com_article&access=standard&Itemid=129&url=/articles/aa/full/2004/31/aa0389-04/aa0389-04.html.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Maldonado, J. et al. (May 2018). "Chemical fingerprints of hot Jupiter planet formation". Astronomy & Astrophysics 612: 18. doi:10.1051/0004-6361/201732001. A93. Bibcode: 2018A&A...612A..93M.
- ↑ "HD 330075". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+330075.
External links
- "HD 330075". Exoplanets. http://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+330075. Retrieved 2009-05-22.
Coordinates: 
15h 49m 37.6913s, −49° 57′ 48.692″
J15493770-4957486
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