15 Trianguli

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15 Trianguli
Triangulum constellation map.svg
Red circle.svg
Location of 15 Trianguli (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Triangulum
Right ascension 02h 35m 46.821s [1]
Declination +34° 41 15.18 [1]
Apparent magnitude  (V)5.396 [2]
Characteristics
Evolutionary stage AGB [3]
Spectral type M3 III [2] [4]
Variable type suspected [5]
Astrometry
Radial velocity (Rv)−8.646±2.407 [6]  km/s
Proper motion (μ)RA: 26.689±0.361 [1]   mas/yr
Dec.: −48.894±0.233 [1]   mas/yr
Parallax (π)4.8075 ± 0.2721  mas [1]
Distance 680 ± 40  ly
(210 ± 10  pc)
Details
Mass 1.689±0.084 [2]   M
Radius 118.453±5.923 [2]   R
Luminosity 1,668 [7]   L
Surface gravity (log g)0.489 [8]   cgs
Temperature 3,572 [8]   K
Metallicity [Fe/H]0.08 [8]   dex
Other designations
15 Trianguli, NSV  866, AG+34°259, BD+34°469, GC  3103, HD  16058, HIP  12086, HR  750, SAO  55687
Database references
SIMBAD data

15 Trianguli is a suspected variable star located in the northern constellation Triangulum, with an apparent magnitude of 5.4 [2] making it faintly visible to the naked eye under ideal conditions, although it is suspected of being an irregular variable with a range of 0.14 magnitudes. [5] The star is situated about 480 light years [1] away but is approaching with a heliocentric radial velocity of −8.646  km/s . [6]

15 Trianguli has a stellar classification of M3 III. [2] [4] It has 1.7 times the mass of the Sun and 118 times the radius of the Sun. [2] It has an effective temperature of 3,572  K [8] and shines at 1,668 times the luminosity of the Sun [7] from its photosphere, giving it an orange glow. It is an asymptotic giant branch star, which means it is fusing hydrogen and helium in separate shells around an inert carbon core. [3]

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HD 200044 is a solitary star in the equatorial constellation Delphinus. It has an apparent magnitude of 5.7, allowing it to be faintly seen with the naked eye. The object is located 598 light years away, but is approaching the Solar System with a heliocentric radial velocity of −15.07 km/s.

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References

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  8. 1 2 3 4 Ghosh, Supriyo; Mondal, Soumen; Das, Ramkrishna; Khata, Dhrimadri (2019). "Spectral calibration of K-M giants from medium-resolution near-infrared HK-band spectra". Monthly Notices of the Royal Astronomical Society . 484 (4): 4619–4634. arXiv: 1901.09170 . Bibcode:2019MNRAS.484.4619G. doi: 10.1093/mnras/stz299 .