HD 330075

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]

HD 330075
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]
Distance147.9 ± 0.3 ly
(45.36 ± 0.09 pc)
Absolute magnitude (MV)5.89[2]
Details
Mass0.86±0.02[4] M☉
Radius0.85+0.02
−0.03[1] R☉
Luminosity0.393±0.001[1] L☉
Surface gravity (log g)4.68±0.09[4] cgs
Temperature4,967+88
−65[1] K
Metallicity [Fe/H]0.18±0.04[4] dex
Age5.30±4.22[4] Gyr
Other designations
CD−49°10033, Gaia DR2 5982775854377691136, HD 330075, HIP 77517, SAO 226248, PPM 321068, LTT 6312, NLTT 41237, 2MASS J15493770-4957486[5]
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		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

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]

The HD 330075 planetary system
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

References
  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. "HD 330075". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-18.
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