Epoch Equinox J2000
|Right ascension||15h 38m 12.91478s |
|Declination||+36° 14′ 48.5597″ |
|Apparent magnitude (V)||6.9 (total)|
|Spectral type||F4V, F5V, G4V, F3V, F7V, M3V? |
|Parallax (π)||9.07 ± 5.48 mas|
|Distance||approx. 400 ly
(approx. 110 pc)
BD+36 2626, CCDM J15382+3615AB, HD 329691, WDS J15382+3615AB
ADS 9731 is a star system that consists of six stars. Four of the stars are visually separate in the sky, forming a visual star system, which was resolved using adaptive optics in 1995. Two of these stars were themselves found to be spectroscopic binaries in 1998, resulting in a total of six known stars in the system. It is one of very few multiple star systems known to have at least six members.
The combined light from the whole system results in an integrated V magnitude of 6.9. The parallax measured by the Hipparcos satellite indicates that the system is relatively nearby at around 110 parsecs (360 light-years) from the Sun. However, this distance is highly uncertain because the multiple stars in the system prevented Hipparcos from accurately measuring the parallax; the system may instead be at a distance of about 200 pc (650 ly).
The star system has been considered as a possible target for direct imaging searches for exoplanets, but no planets have yet been detected in the system.
- Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- Tokovinin, A. A.; Shatskii, N. I.; Magnitskii, A. K. (1998). "ADS 9731: A new sextuple system". Astronomy Letters 24: 795. Bibcode:1998PAZh...24..918T.
- Drummond, Jack D.; Christou, Julian C.; Fugate, Robert Q. (1995). "Full Adaptive Optics Images of ADS 9731 and MU Cassiopeiae: Orbits and Masses". Astrophysical Journal 450: 380. Bibcode:1995ApJ...450..380D. doi:10.1086/176148.
- Fabricius, C.; Makarov, V. V. (2000). "Hipparcos astrometry for 257 stars using Tycho-2 data". Astronomy and Astrophysics Supplement Series 144: 45. Bibcode:2000A&AS..144...45F. doi:10.1051/aas:2000198.
- Janson, M. (2010). "The relevance of prior inclination determination for direct imaging of Earth-like planets". Monthly Notices of the Royal Astronomical Society 408: 514. arXiv:1006.2941. Bibcode:2010MNRAS.408..514J. doi:10.1111/j.1365-2966.2010.17135.x.
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