Fomalhaut C
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Stern Fomalhaut C |
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| DSS image of the star field around Fomalhaut (sky section of almost 3 degrees) | |||||||
| AladinLite | |||||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Aquarius | ||||||
| Right ascension | 22 h 48 m 4.49 s | ||||||
| declination | -24 ° 22 ′ 7.7 ″ | ||||||
| Apparent brightness | (12.6) mag | ||||||
| Typing | |||||||
| B − V color index | (1.68) | ||||||
| R − I index | (2.54) | ||||||
| Spectral class | M4.0 Ve | ||||||
| Astrometry | |||||||
| Radial velocity | (+6.5 ± 0.5) km / s | ||||||
| parallax | (130.30 ± 0.08) mas | ||||||
| distance | (25.0) ly (7.7) pc |
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| Visual absolute brightness M vis | (13.21 ± 0.02) mag | ||||||
| Proper movement | |||||||
| Rec. Share: | (+331.9) mas / a | ||||||
| Dec. portion: | (−183.5) mas / a | ||||||
| Physical Properties | |||||||
| Dimensions | (0.18 ± 0.02) M ☉ | ||||||
| Luminosity |
(0.0046) L ☉ |
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| Effective temperature | (3132 ± 65) K. | ||||||
| Metallicity [Fe / H] | (−0.1) | ||||||
| Rotation time | (0.466) | ||||||
| Age | (440 ± 40) mill. A | ||||||
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Other names and catalog entries |
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Fomalhaut C (also LP 876-10 ) is a red dwarf of the spectral class M at a distance of about 25 light years . Together with Fomalhaut A and TW Piscis Austrini ( Fomalhaut B ) it forms a multiple star system .
properties
It had long been suspected that the star is gravitationally bound to Fomalhaut A, but could only be confirmed in a relatively short time. The star is not located in the Southern Pisces constellation like the other two stars in the system, but rather in the Aquarius constellation . One orbit of the star takes about 20 million years due to the great distance from Fomalhaut A.
Individual evidence
- ↑ a b c d e f g h SIMBAD
- ↑ a b c d e f Eric E. Mamajek, Jennifer L. Bartlett, Andreas Seifahrt, Todd J. Henry, Sergio B. Dieterich, John C. Lurie, Matthew A. Kenworthy, Wei-Chun Jao, Adric R. Riedel, John P. Subasavage, Jennifer G. Winters, Charlie T. Finch, Philip A. Ianna, Jacob Bean: The Solar Neighborhood. XXX. Fomalhaut C . In: The Astronomical Journal . 146, No. 6, 2013, p. 154. arxiv : 1310.0764 . bibcode : 2013AJ .... 146..154M . doi : 10.1088 / 0004-6256 / 146/6/154 .
- ↑ Aaas.org: ScienceShot: A 20-Million-Year Orbit. October 3, 2013, accessed June 30, 2018 .