Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Equuleus |
Right ascension | 21h 21m 04.825s [1] |
Declination | 07° 21′ 16.21″ [1] |
Apparent magnitude (V) | 5.798 [2] |
Characteristics | |
Spectral type | M2IIIa [3] |
U−B color index | +1.97 [4] |
B−V color index | +1.66 [4] |
Variable type | suspected [5] |
Astrometry | |
Radial velocity (Rv) | −21.82±0.30 [1] km/s |
Proper motion (μ) |
RA: 43.871±0.274
[1]
mas/
yr Dec.: −17.822±0.261 [1] mas/ yr |
Parallax (π) | 4.3895 ± 0.1647 mas [1] |
Distance | 740 ± 30
ly (228 ± 9 pc) |
Absolute magnitude (MV) | −0.69 [6] |
Details | |
Radius | 58 [1] R☉ |
Luminosity | 720 [1] L☉ |
Temperature | 3,920 [1] K |
Other designations | |
Database references | |
SIMBAD | data |
9 Equulei is an M-type star in the constellation Equuleus. It is an asymptotic giant branch (AGB) star, a star that has exhausted its core helium and is now fusing both hydrogen and helium in shells outside the core. [7] It is also a suspected variable star with an amplitude of about 0.05 magnitudes. [5]
The spectral type is M2IIIa, meaning it is a relatively cool giant star. As an AGB star, it is burning hydrogen and helium in shells around an inert carbon-oxygen core. It has expanded to 58 times the radius of the Sun, and it radiates 720 times as much electromagnetic radiation from a photosphere with an effective temperature of 3,920 K.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Equuleus |
Right ascension | 21h 21m 04.825s [1] |
Declination | 07° 21′ 16.21″ [1] |
Apparent magnitude (V) | 5.798 [2] |
Characteristics | |
Spectral type | M2IIIa [3] |
U−B color index | +1.97 [4] |
B−V color index | +1.66 [4] |
Variable type | suspected [5] |
Astrometry | |
Radial velocity (Rv) | −21.82±0.30 [1] km/s |
Proper motion (μ) |
RA: 43.871±0.274
[1]
mas/
yr Dec.: −17.822±0.261 [1] mas/ yr |
Parallax (π) | 4.3895 ± 0.1647 mas [1] |
Distance | 740 ± 30
ly (228 ± 9 pc) |
Absolute magnitude (MV) | −0.69 [6] |
Details | |
Radius | 58 [1] R☉ |
Luminosity | 720 [1] L☉ |
Temperature | 3,920 [1] K |
Other designations | |
Database references | |
SIMBAD | data |
9 Equulei is an M-type star in the constellation Equuleus. It is an asymptotic giant branch (AGB) star, a star that has exhausted its core helium and is now fusing both hydrogen and helium in shells outside the core. [7] It is also a suspected variable star with an amplitude of about 0.05 magnitudes. [5]
The spectral type is M2IIIa, meaning it is a relatively cool giant star. As an AGB star, it is burning hydrogen and helium in shells around an inert carbon-oxygen core. It has expanded to 58 times the radius of the Sun, and it radiates 720 times as much electromagnetic radiation from a photosphere with an effective temperature of 3,920 K.