Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Hydra |
Right ascension | 09h 54m 52.2045s [1] |
Declination | −19° 00′ 33.620″ [1] |
Apparent magnitude (V) | 4.94 [2] |
Characteristics | |
Evolutionary stage | AGB [3] |
Spectral type | K5 III [4] |
U−B color index | +1.93 [2] |
B−V color index | +1.57 [2] |
Astrometry | |
Radial velocity (Rv) | 50±4.2 [5] km/s |
Proper motion (μ) |
RA: −45.386
mas/
yr
[1] Dec.: −40.456 mas/ yr [1] |
Parallax (π) | 5.6789 ± 0.2214 mas [1] |
Distance | 570 ± 20
ly (176 ± 7 pc) |
Absolute magnitude (MV) | −1.43 [6] |
Details | |
Mass | 6.40+1.2 −0.4 [7] M☉ |
Radius | 56.7 [8] R☉ |
Luminosity | 721±32 [9] L☉ |
Surface gravity (log g) | 1.3±0.04 [10] cgs |
Temperature | 3,875±39 [10] K |
Metallicity [Fe/H] | −0.18±0.07 [10] dex |
Other designations | |
Database references | |
SIMBAD | data |
HD 85951 (HR 3923), formally named Felis /ˈfiːlɪs/, [13] is a solitary [14] orange hued star in the constellation Hydra. It has an apparent magnitude of 4.94, [2] making it faintly visible to the naked eye under ideal conditions. Based on parallax measurements, the object is about 570 light-years away from the Sun [1] and is receding with a heliocentric radial velocity of 50 km/s. [5]
HD 85951 was the brightest star in the now-obsolete constellation of Felis. [15] In 2016, the IAU organized a Working Group on Star Names (WGSN) [16] to catalog and standardize proper names for stars. The WGSN approved the name Felis for this star on 1 June 2018 and it is now so included in the List of IAU-approved Star Names. [13]
This an evolved red giant with a stellar classification of K5 III. [4] It is currently on the asymptotic giant branch, [3] generating energy via fusion of hydrogen and helium shells around an inert carbon core. At present Felis has 6.4 times the mass of the Sun [7] and due to its evolved status, has an enlarged radius of 56.7 R☉. [8] It radiates at a bolometric luminosity 721 times that of the Sun [9] from its photosphere at an effective temperature of 3,875 K. [10] Felis has an iron abundance 66% that of the Sun, making it metal deficient.
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Hydra |
Right ascension | 09h 54m 52.2045s [1] |
Declination | −19° 00′ 33.620″ [1] |
Apparent magnitude (V) | 4.94 [2] |
Characteristics | |
Evolutionary stage | AGB [3] |
Spectral type | K5 III [4] |
U−B color index | +1.93 [2] |
B−V color index | +1.57 [2] |
Astrometry | |
Radial velocity (Rv) | 50±4.2 [5] km/s |
Proper motion (μ) |
RA: −45.386
mas/
yr
[1] Dec.: −40.456 mas/ yr [1] |
Parallax (π) | 5.6789 ± 0.2214 mas [1] |
Distance | 570 ± 20
ly (176 ± 7 pc) |
Absolute magnitude (MV) | −1.43 [6] |
Details | |
Mass | 6.40+1.2 −0.4 [7] M☉ |
Radius | 56.7 [8] R☉ |
Luminosity | 721±32 [9] L☉ |
Surface gravity (log g) | 1.3±0.04 [10] cgs |
Temperature | 3,875±39 [10] K |
Metallicity [Fe/H] | −0.18±0.07 [10] dex |
Other designations | |
Database references | |
SIMBAD | data |
HD 85951 (HR 3923), formally named Felis /ˈfiːlɪs/, [13] is a solitary [14] orange hued star in the constellation Hydra. It has an apparent magnitude of 4.94, [2] making it faintly visible to the naked eye under ideal conditions. Based on parallax measurements, the object is about 570 light-years away from the Sun [1] and is receding with a heliocentric radial velocity of 50 km/s. [5]
HD 85951 was the brightest star in the now-obsolete constellation of Felis. [15] In 2016, the IAU organized a Working Group on Star Names (WGSN) [16] to catalog and standardize proper names for stars. The WGSN approved the name Felis for this star on 1 June 2018 and it is now so included in the List of IAU-approved Star Names. [13]
This an evolved red giant with a stellar classification of K5 III. [4] It is currently on the asymptotic giant branch, [3] generating energy via fusion of hydrogen and helium shells around an inert carbon core. At present Felis has 6.4 times the mass of the Sun [7] and due to its evolved status, has an enlarged radius of 56.7 R☉. [8] It radiates at a bolometric luminosity 721 times that of the Sun [9] from its photosphere at an effective temperature of 3,875 K. [10] Felis has an iron abundance 66% that of the Sun, making it metal deficient.