1 Trianguli

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1 Trianguli
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Triangulum
Right ascension 01h 42m 05.92475s [1]
Declination +29° 30 21.8431 [1]
Apparent magnitude  (V)7.52±0.01 [2]
Characteristics
Evolutionary stage main sequence star [1]
Spectral type A2 V [3]
B−V color index +0.06 [2]
Astrometry
Radial velocity (Rv)7±4.5 [4]  km/s
Proper motion (μ)RA: −10.545  mas/yr [1]
Dec.: −0.288  mas/yr [1]
Parallax (π)4.5114 ± 0.0515  mas [1]
Distance 723 ± 8  ly
(222 ± 3  pc)
Absolute magnitude  (MV)+0.78 [5]
Details
Mass 2.36+0.34
0.30
[6]   M
Radius 2.69±0.14 [7]   R
Luminosity 52+1.5
2.2
[1]   L
Surface gravity (log g)3.90 [8]   cgs
Temperature 9,305+145
192
[6]   K
Metallicity [Fe/H]−0.02 [8]   dex
Age 371±23 [9] [10]   Myr
Other designations
1 Trianguli, AG+29°220, BD+28°282, GC  2068, HD  10407, HIP  7948, SAO  74880, GSC  01762-00704 [11]
Database references
SIMBAD data

1 Trianguli, also known as HD 10407, is a star located in the northern constellation Triangulum. It has an apparent magnitude of 7.52, [2] making it readily visible in binoculars but not to the naked eye. Gaia DR3 parallax measurements imply a distance of 723 light years [1] and it is currently receding with a heliocentric radial velocity of 7  km/s . [4] At its current distance 1 Trianguli's brightness is diminished by a quarter of a magnitudes due to interstellar dust [12] and it has an absolute magnitude of +0.78. [5] Even though it has a Flamsteed designation, 1 Trianguli is one of the 220 Flamsteed stars that are not in the Yale Bright Star Catalogue. [13]

1 Trianguli has a stellar classification of A2 V, [3] indicating that it is an ordinary A-type main-sequence star. It has 2.36 times the mass of the Sun [6] and 2.69 times the Sun's radius. [7] It radiates 52 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 9,305  K , [6] giving it a white hue. It has a near solar metallicity at [Fe/H] = −0.02 [8] and 1 Trianguli is estimated to be 371 million years old. [9] [10]

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