Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Triangulum |
Right ascension | 02h 37m 02.340s [1] |
Declination | +34° 15′ 51.34″ [1] |
Apparent magnitude (V) | 5.4–12.6 [2] |
Characteristics | |
Spectral type | M3.5-8IIIe [2] |
Apparent magnitude (B) | 8.524±0.018 |
Apparent magnitude (G) | 6.699±0.055 |
Apparent magnitude (R) | 8.24 |
Apparent magnitude (J) | 2.23±0.27 |
Apparent magnitude (H) | 1.36±0.22 |
Apparent magnitude (K) | 1.05±0.21 |
Variable type | Mira [2] |
Astrometry | |
Radial velocity (Rv) | 67.52±0.88 [1] km/s |
Proper motion (μ) |
RA: +34.272
mas/
yr
[1] Dec.: −10.683 mas/ yr [1] |
Parallax (π) | 2.4334 ± 0.2487 mas [1] |
Distance | approx. 1,300
ly (approx. 410 pc) |
Details | |
Mass | 1.71 [3] M☉ |
Radius | 196±41 [4] R☉ |
Luminosity | 1,784 [5] L☉ |
Surface gravity (log g) | −0.09 [1] cgs |
Temperature | 3184±120 [4] K |
Other designations | |
Database references | |
SIMBAD | data |
R Trianguli (abbreviated as R Tri) is a short-period oxygen-rich [4] Mira variable in Triangulum with a period of 266.9 days, [2] discovered by T. H. E. C. Espin in 1890. [7] It is losing about 1.1×10−7 M☉/yr, close to average for a short-period Mira variable. [8] While most short-period Mira variables reside in the Galactic halo, R Trianguli is a member of the thick disk, and its proper motion is fairly high for its distance. [4] Its angular diameter in the K band was measured in 2002 to be, on average, 5.22±0.30 mas, with a shape suggesting that there is an optically thin disk structure surrounding the star. [4]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Triangulum |
Right ascension | 02h 37m 02.340s [1] |
Declination | +34° 15′ 51.34″ [1] |
Apparent magnitude (V) | 5.4–12.6 [2] |
Characteristics | |
Spectral type | M3.5-8IIIe [2] |
Apparent magnitude (B) | 8.524±0.018 |
Apparent magnitude (G) | 6.699±0.055 |
Apparent magnitude (R) | 8.24 |
Apparent magnitude (J) | 2.23±0.27 |
Apparent magnitude (H) | 1.36±0.22 |
Apparent magnitude (K) | 1.05±0.21 |
Variable type | Mira [2] |
Astrometry | |
Radial velocity (Rv) | 67.52±0.88 [1] km/s |
Proper motion (μ) |
RA: +34.272
mas/
yr
[1] Dec.: −10.683 mas/ yr [1] |
Parallax (π) | 2.4334 ± 0.2487 mas [1] |
Distance | approx. 1,300
ly (approx. 410 pc) |
Details | |
Mass | 1.71 [3] M☉ |
Radius | 196±41 [4] R☉ |
Luminosity | 1,784 [5] L☉ |
Surface gravity (log g) | −0.09 [1] cgs |
Temperature | 3184±120 [4] K |
Other designations | |
Database references | |
SIMBAD | data |
R Trianguli (abbreviated as R Tri) is a short-period oxygen-rich [4] Mira variable in Triangulum with a period of 266.9 days, [2] discovered by T. H. E. C. Espin in 1890. [7] It is losing about 1.1×10−7 M☉/yr, close to average for a short-period Mira variable. [8] While most short-period Mira variables reside in the Galactic halo, R Trianguli is a member of the thick disk, and its proper motion is fairly high for its distance. [4] Its angular diameter in the K band was measured in 2002 to be, on average, 5.22±0.30 mas, with a shape suggesting that there is an optically thin disk structure surrounding the star. [4]