Delta Trianguli

Delta Trianguli
Location of δ Trianguli (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Triangulum
Right ascension 02h 17m 03.23016s[1]
Declination +34° 13′ 27.2260″[1]
Apparent magnitude (V) +4.865[2]
Characteristics
Spectral type G0V + G9V to K4V[3]
U−B color index +0.02[4]
B−V color index +0.61[4]
Astrometry
Radial velocity (Rv)−5.70[5] km/s
Proper motion (μ) RA: 1151.83[1] mas/yr
Dec.: −246.89[1] mas/yr
Parallax (π)92.73 ± 0.39 mas[1]
Distance35.2 ± 0.1 ly
(10.78 ± 0.05 pc)
Absolute magnitude (MV)4.69[2]
Orbit[6]
CompanionDelta Trianguli B
Period (P)10.02 days
Semi-major axis (a)9.80±0.06 mas
Eccentricity (e)0.020±0.005
Inclination (i)167±3°
Longitude of the node (Ω)15±9°
Details
A
Mass0.884±0.059[7] M☉
Radius0.98[8] R☉
Surface gravity (log g)4.5[9] cgs
Temperature6,215[3] K
Metallicity [Fe/H]−0.39[2] to −0.30[9] dex
Rotational velocity (v sin i)10.00[5] km/s
Age8.5[10] to 9.0[2] Gyr
B
Mass0.785±0.044[7] M☉
Temperature4,493[3] K
Other designations
δ Tri, Delta Tri, 8 Trianguli, BD+33° 395, HD 13974, HIP 10644, HR 660, SAO 55420, LHS 154, LTT 10770[11]
Database references
SIMBADdata

Delta Trianguli, Latinized from Delta Tri, is a spectroscopic binary star system approximately 35 light-years (11 pc) away in the constellation of Triangulum. The primary star is a yellow dwarf, while the secondary star is thought to be an orange dwarf. It has an apparent magnitude of +4.87 and forms an optical (line-of-sight) triple with Gamma Trianguli and 7 Trianguli.[12]

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