F Hydrae

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F Hydrae
Hydra constellation map.svg
Red circle.svg
Location of F Hya (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Hydra
Right ascension 08h 43m 40.37345s [1]
Declination −07° 15 01.4323 [1]
Apparent magnitude  (V)4.64 [2]
Characteristics
Spectral type G1Ib [3]
B−V color index +0.80 [2]
Astrometry
Radial velocity (Rv)28.50 [4]  km/s
Proper motion (μ)RA: 11.62 [1]   mas/yr
Dec.: 1.36 [1]   mas/yr
Parallax (π)4.24 ± 0.17  mas [1]
Distance 770 ± 30  ly
(236 ± 9  pc)
Absolute magnitude  (MV)2.77 [5]
Details
Mass 5.2 [3]   M
Radius 110 [6]   R
Surface gravity (log g)2.08 [3]   cgs
Temperature 5,370 [3]   K
Metallicity [Fe/H]0.01 [7]   dex
Rotational velocity (v sin i)10.5 [8]  km/s
Age 89 [3] [9]   Myr
Other designations
F  Hya, 31  Mon, [10] HR  3459, HD  74395, BD 06°2708, SAO  136221, HIP  42835, WDS  J08437-0714
Database references
SIMBAD data

F Hydrae, also known as HD 74395, is a star in the constellation Hydra with an apparent magnitude is 4.64. It was catalogued as 31 Monocerotis, but this name is now rarely used since the star is now within the boundaries of Hydra. [10] It is a low mass yellow supergiant around a thousand times brighter than the sun and five times as massive.

F Hya is a catalogued as a triple star, with 8th magnitude BD-06°2707 80" away and 13th magnitude companion at 57". [11]

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References

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