HD 10647

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This article is about q1 Eridani. For other stars with this Bayer designation, see q Eridani.
HD 10647
Diagram showing star positions and boundaries of the Eridanus constellation and its surroundings
Cercle rouge 100%.svg

A star chart of the Eridanus constellation showing the position of HD 10647 (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Eridanus
Right ascension 01h 42m 29.32s[1]
Declination –53° 44′ 27.0″[1]
Apparent magnitude (V) 5.52[2]
Spectral type F9V[3]
B−V color index 0.551[2]
Radial velocity (Rv) 12.9 km/s
Proper motion (μ) RA: +166.32 ± 0.24[1] mas/yr
Dec.: –106.52 ± 0.27[1] mas/yr
Parallax (π) 57.36 ± 0.25[1] mas
Distance 56.9 ± 0.2 ly
(17.43 ± 0.08 pc)
Absolute magnitude (MV) 4.32
Mass 1.11 ± 0.02[3] M
Radius 1.10 ± 0.02[3] R
Luminosity 1.41[3] L
Temperature 6218 ± 20[3] K
Metallicity [Fe/H] 0.00 ± 0.01[3] dex
Rotation 10 ± 3[3]
Rotational velocity (v sin i) 4.9[3] km/s
Age 1.4 ± 0.9[3] Gyr
Other designations
q1 Eridani, 5 G. Eridani, GJ 3109, HR 506, HIP 7978, SAO 232501, CPD−54° 365
Database references
Extrasolar Planets

HD 10647 (q1 Eridani) is a 6th-magnitude yellow-white dwarf star, 57 light-years away in the constellation of Eridanus. The star is visible to the unaided eye under very dark skies. It is slightly hotter and more luminous than the Sun, and at 1,750 million years old, it is also younger. An extrasolar planet was discovered orbiting this star in 2003.

Planetary system[edit]

In 2003, Michel Mayor's team announced the discovery of a new planet, HD 10647 b, in Paris at the XIX IAP Colloquium Extrasolar Planets: Today & Tormorrow* [1]. The Anglo-Australian Planet Search team initially did not detect the planet in 2004,[4] though a solution was made by 2006.[5] The CORALIE data was finally published in 2013.[3]

The IRAS infrared space telescope detected an excess of infrared radiation from the star, indicating a possible circumstellar disk.[6] Using this data and later observations with the Spitzer Space Telescope, Infrared Space Observatory and the Atacama Pathfinder Experiment implies that the disk is located at 25 Astronomical units and has a thin (0.02 AU), ring-like structure, with the sharp cutoff in the disk suggesting a planet.[7] Additionally, a much longer wavelength suggests the existence of a much wider belt of material, analogous to the Kuiper belt. The hierarchy of this system is somewhat reminiscent of that of Epsilon Eridani, without an inner asteroid belt.

The HD 10647 planetary system[3]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b >0.94 ± 0.08 MJ 2.015 ± 0.011 989.2 ± 8.1 0.15 ± 0.08
Dust disk 25 AU
Dust disk 270–330 AU


  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ a b Decin, G.; et al. (November 2003), "Age Dependence of the Vega Phenomenon: Observations", The Astrophysical Journal, 598 (1): 636–644, arXiv:astro-ph/0308294Freely accessible, Bibcode:2003ApJ...598..636D, doi:10.1086/378800 
  3. ^ a b c d e f g h i j k Marmier, M.; et al. (2013). "The CORALIE survey for southern extrasolar planets XVII. New and updated long period and massive planets". Astronomy and Astrophysics. 551. A90. arXiv:1211.6444Freely accessible. Bibcode:2013A&A...551A..90M. doi:10.1051/0004-6361/201219639. 
  4. ^ Jones, H. R. A.; et al. (2004). "HD10647 and the Distribution of Exoplanet Properties with Semi-major Axis". Bibcode:2004ASPC..321..298J. 
  5. ^ Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493Freely accessible. Bibcode:2006ApJ...646..505B. doi:10.1086/504701. 
  6. ^ Stencel and Backman; Backman, Dana E. (1991). "A survey for infrared excesses among high galactic latitude SAO stars". The Astrophysical Journal Supplement Series. 75: 905–924. Bibcode:1991ApJS...75..905S. doi:10.1086/191553. 
  7. ^ Liseau; et al. (2008). "q1 Eridani: a solar-type star with a planet and a dust belt". Astronomy and Astrophysics Letters. 480 (3): L47–L50. arXiv:0803.1294Freely accessible. Bibcode:2008A&A...480L..47L. doi:10.1051/0004-6361:20079276. 

External links[edit]

Coordinates: Sky map 01h 42m 29.32s, −53° 44′ 27.00″