Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Delphinus |
Right ascension | 21h 00m 27.6883s [1] |
Declination | +19° 19′ 46.493″ [1] |
Apparent magnitude (V) | 5.70±0.01 [2] |
Characteristics | |
Evolutionary stage | AGB [3] |
Spectral type | M3 IIIab [4] |
B−V color index | +1.61 [5] |
Variable type | suspected [6] |
Astrometry | |
Radial velocity (Rv) | −15.07±0.09 [7] km/s |
Proper motion (μ) |
RA: −15.483
mas/
yr
[1] Dec.: −59.705 mas/ yr [1] |
Parallax (π) | 5.455 ± 0.0753 mas [1] |
Distance | 598 ± 8
ly (183 ± 3 pc) |
Absolute magnitude (MV) | −0.33 [8] |
Details | |
Mass | 1.32 [9] M☉ |
Radius | 58 [10] R☉ |
Luminosity | 507 [11] L☉ |
Surface gravity (log g) | 0.93 [12] cgs |
Temperature | 3,707 [10] K |
Other designations | |
Database references | |
SIMBAD | data |
HD 200044 (HR 8044) is a solitary [13] star in the equatorial constellation Delphinus. It has an apparent magnitude of 5.7, [2] allowing it to be faintly seen with the naked eye. The object is located 598 light years away, [1] but is approaching the Solar System with a heliocentric radial velocity of −15.07 km/s. [7]
HD 200044 has a spectral classification of M3 IIIab, [4] indicating that its an ageing red giant. It is currently on the asymptotic giant branch and is fusing hydrogen and helium in shells around an inert carbon core. [3] As a consequence, it has expanded to 58 times the radius of the Sun and is now radiating with a luminosity over 500 times greater than that of the Sun. HD 200044's large size and high luminosity yield an effective temperature of 3,707 K, giving it a red glow. HD 200044 is suspected to be a variable star with an amplitude of 0.05 magnitudes. [6]
There is a 10th magnitude optical companion separated 49.3 ″ away and at a position angle of 337 ° as of 2014. However, the separation is increasing due to HD 200044's high proper motion. [14]
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Delphinus |
Right ascension | 21h 00m 27.6883s [1] |
Declination | +19° 19′ 46.493″ [1] |
Apparent magnitude (V) | 5.70±0.01 [2] |
Characteristics | |
Evolutionary stage | AGB [3] |
Spectral type | M3 IIIab [4] |
B−V color index | +1.61 [5] |
Variable type | suspected [6] |
Astrometry | |
Radial velocity (Rv) | −15.07±0.09 [7] km/s |
Proper motion (μ) |
RA: −15.483
mas/
yr
[1] Dec.: −59.705 mas/ yr [1] |
Parallax (π) | 5.455 ± 0.0753 mas [1] |
Distance | 598 ± 8
ly (183 ± 3 pc) |
Absolute magnitude (MV) | −0.33 [8] |
Details | |
Mass | 1.32 [9] M☉ |
Radius | 58 [10] R☉ |
Luminosity | 507 [11] L☉ |
Surface gravity (log g) | 0.93 [12] cgs |
Temperature | 3,707 [10] K |
Other designations | |
Database references | |
SIMBAD | data |
HD 200044 (HR 8044) is a solitary [13] star in the equatorial constellation Delphinus. It has an apparent magnitude of 5.7, [2] allowing it to be faintly seen with the naked eye. The object is located 598 light years away, [1] but is approaching the Solar System with a heliocentric radial velocity of −15.07 km/s. [7]
HD 200044 has a spectral classification of M3 IIIab, [4] indicating that its an ageing red giant. It is currently on the asymptotic giant branch and is fusing hydrogen and helium in shells around an inert carbon core. [3] As a consequence, it has expanded to 58 times the radius of the Sun and is now radiating with a luminosity over 500 times greater than that of the Sun. HD 200044's large size and high luminosity yield an effective temperature of 3,707 K, giving it a red glow. HD 200044 is suspected to be a variable star with an amplitude of 0.05 magnitudes. [6]
There is a 10th magnitude optical companion separated 49.3 ″ away and at a position angle of 337 ° as of 2014. However, the separation is increasing due to HD 200044's high proper motion. [14]