Astronomy:HD 10647

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Short description: Star in the constellation Eridanus
For other stars with this Bayer designation, see q Eridani.
HD 10647
Location of HD 10647 (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Eridanus[1]
Right ascension  01h 42m 29.3145s[2]
Declination −53° 44′ 26.991″[2]
Apparent magnitude (V) +5.52[3]
Characteristics
Evolutionary stage main sequence[2]
Spectral type F9V[4]
B−V color index 0.551[3]
Astrometry
Radial velocity (Rv)27.64±0.12[2] km/s
Proper motion (μ) RA: 166.041(34)[2] mas/yr
Dec.: −105.496(46)[2] mas/yr
Parallax (π)57.6409 ± 0.0453[2] mas
Distance56.58 ± 0.04 ly
(17.35 ± 0.01 pc)
Absolute magnitude (MV)4.31[1]
Details
Mass1.15+0.01
−0.02[5] M☉
Radius1.10±0.02[4] R☉
Luminosity1.41[4] L☉
Surface gravity (log g)4.55±0.02[5] cgs
Temperature6,207±11[5] K
Metallicity [Fe/H]−0.027±0.008[5] dex
Rotation10±3[4]
Rotational velocity (v sin i)4.9[4] km/s
Age0.70+0.30
−0.24[5] Gyr
Other designations
q1 Eridani, CPD−54°365, GJ 3109, HIP 7978, HR 506, SAO 232501[6]
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

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 700 million years old, it is also younger. An extrasolar planet was discovered orbiting this star in 2003.

Planetary system

Millimetre image of the disk from the REASONS survey[7]
Millimetre image of the disk from the REASONS survey[7]

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 & Tomorrow.[8] The Anglo-Australian Planet Search team initially did not detect the planet in 2004,[9] though a solution was made by 2006.[10] The CORALIE data was finally published in 2013.[4]

The IRAS infrared space telescope detected an excess of infrared radiation from the star, indicating a possible circumstellar disk.[11] Out of the 300 nearest Sun-like stars, the disk has the highest fractional luminosity out of all of them.[12] It is unusually bright, but not unusually massive; the lower bound of the mass is 8 times that of the Earth.[12]

The inclination of the disk is relatively high,[13] and the disk is asymmetrical, being more extended in the northeast direction than the southwest.[12] It extends from 34 astronomical units (AU) at the inner edge to 134 AU at the outer edge. The inner edge is sharp, suggesting the existence of a planet that carved out the edge. HD 10647 b, with a semimajor axis of about 2 AU, is too far to be responsible. However, other potential planets may be responsible for this feature.[12]

If HD 10647 b shares the same orbital inclination as the disk (76.7°±1.0°), its mass should be about 1.07 Jupiter masses, close to its minimum mass of 0.90 Jupiter masses.[5]

There is some evidence for an additional, warm asteroid belt-like component further in, at 3 to 10 AU away from the star.[12]

The HD 10647 planetary system[lower-alpha 1]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 1.07±0.05 MJ 2.02±0.01 991.90±1.45 0.37±0.03 — —
Dust disk 3–10 AU — —
Dust disk 34–134 AU 76.1±1.0° —

Notes

  1. ↑ HD 10647 b: Bisht & Jones (2024)[14]
    Disks: Lovell et al. (2021)[12]

References

  1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 Decin, G. et al. (November 2003). "Age Dependence of the Vega Phenomenon: Observations". The Astrophysical Journal 598 (1): 636–644. doi:10.1086/378800. Bibcode: 2003ApJ...598..636D. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 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. doi:10.1051/0004-6361/201219639. Bibcode: 2013A&A...551A..90M. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Carvalho-Silva, Gabriela; Meléndez, Jorge; Rathsam, Anne; Shejeelammal, J.; Martos, Giulia; Lorenzo-Oliveira, Diego; Spina, Lorenzo; Ribeiro Alves, Débora (April 2025). "A New Age–Activity Relation For Solar Analogs that Accounts for Metallicity" (in en). The Astrophysical Journal Letters 983 (2): L31. doi:10.3847/2041-8213/adc382. ISSN 2041-8205. Bibcode: 2025ApJ...983L..31C. 
  6. ↑ "HD 10647". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+10647. 
  7. ↑ Matrà, L.; Marino, S.; Wilner, D. J.; Kennedy, G. M.; Booth, M.; Krivov, A. V.; Williams, J. P.; Hughes, A. M. et al. (2025-01-15). "REsolved ALMA and SMA Observations of Nearby Stars (REASONS): A population of 74 resolved planetesimal belts at millimetre wavelengths". Astronomy and Astrophysics 693. doi:10.1051/0004-6361/202451397. Bibcode: 2025A&A...693A.151M. 
  8. ↑ S. Udry. "A Jovian planet around HD 10647". http://obswww.unige.ch/~udry/planet/hd10647.html. 
  9. ↑ Jones, H. R. A. (2004). "HD10647 and the Distribution of Exoplanet Properties with Semi-major Axis". Extrasolar Planets: Today and Tomorrow 321: 298. Bibcode: 2004ASPC..321..298J. 
  10. ↑ Butler, R. P. et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646 (1): 505–522. doi:10.1086/504701. Bibcode: 2006ApJ...646..505B. 
  11. ↑ Stencel, Robert E.; Backman, Dana E. (1991). "A Survey for Infrared Excesses among High Galactic Latitude SAO Stars". The Astrophysical Journal Supplement Series 75: 905. doi:10.1086/191553. Bibcode: 1991ApJS...75..905S. 
  12. ↑ 12.0 12.1 12.2 12.3 12.4 12.5 Lovell, J. B.; Marino, S.; Wyatt, M. C.; Kennedy, G. M.; MacGregor, M. A.; Stapelfeldt, K.; Dent, B.; Krist, J. et al. (2021). "High-resolution ALMA and HST images of q1 Eri: An asymmetric debris disc with an eccentric Jupiter". Monthly Notices of the Royal Astronomical Society 506 (2): 1978–2001. doi:10.1093/mnras/stab1678. 
  13. ↑ 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. doi:10.1051/0004-6361:20079276. Bibcode: 2008A&A...480L..47L. 
  14. ↑ Bisht, Deepak; Jones, Hugh R. A. (November 2024). "Radial velocity analysis of stars with debris discs". Monthly Notices of the Royal Astronomical Society 534 (3): 2105–2118. doi:10.1093/mnras/stae2223. Bibcode: 2024MNRAS.534.2105B. 

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



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