Fomalhaut C

Fomalhaut C (LP 876-10)
Fomalhaut C is located in the constellation Aquarius.
Fomalhaut C is located in the constellation Aquarius.
Fomalhaut C
Location of Fomalhaut C in the constellation Aquarius

Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 48m 04.49285s[1]
Declination −24° 22′ 07.7178″[1]
Apparent magnitude (V) 12.624[2]
Characteristics
Spectral type M4V[3]
Astrometry
Radial velocity (Rv)5.77±0.58[1] km/s
Proper motion (μ) RA: 331.609 mas/yr[1]
Dec.: −183.805 mas/yr[1]
Parallax (π)130.2707 ± 0.0325 mas[1]
Distance25.037 ± 0.006 ly
(7.676 ± 0.002 pc)
Absolute magnitude (MV)13.21 ± 0.02[3]
Details[3]
Mass0.18±0.02 M☉
Radius0.23 ± 0.01[a] R☉
Luminosity0.004603 L☉
Temperature3,132±65 K
Metallicity [Fe/H]−0.1 dex
Rotation0.466 days
Other designations
Fomalhaut C, α PsA C, LP 876-10, NLTT 54872, WDS J22577-2937C, 2MASS J22480446-2422075, Gaia DR2 6623351805412369024
Database references
SIMBADdata

Fomalhaut C, also designated LP 876-10, is the distant third star of the Fomalhaut system. It is about five degrees from Fomalhaut, roughly halfway between it and the Helix Nebula. It is currently 2.5 light-years (0.77 pc) from Fomalhaut (A), and 3.2 light-years away from Fomalhaut B (0.987 pc). The entire system is only around 25 light-years (7.7 pc) from the Solar System. It was originally catalogued as a lone red dwarf, until October 2013, when Eric Mamajek announced that the star had a distance, velocity and color-magnitude position consistent with it being part of the Fomalhaut system. It was most likely catalogued with no relation to Fomalhaut due to the fact that it is in the Aquarius constellation, while the rest of the system are in the Piscis Austrinus constellation.[4]

  1. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ Zacharias, N. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog. Bibcode:2012yCat.1322....0Z.
  3. ^ a b c Cite error: The named reference Mamajek was invoked but never defined (see the help page).
  4. ^ King, Bob (2014-10-01). "Fomalhaut: A Crazy-Wide Triple Star". Sky & Telescope. Retrieved 2016-01-17. When you next look at Fomalhaut twinkling above the fall leaves, put four fingers together and hold them up against the sky. They'll cover about 8°, or the amount of real estate spanned by the triple system.


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