HD 174474
High proper motion star; Telescopium / From Wikipedia, the free encyclopedia
HD 174474, also designated as HR 7095 or rarely 35 G. Telescopii, is a solitary white-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.17,[2] placing it near the limit for naked eye visibility. The object is located relatively close at a distance of 244 light years based on Gaia DR3 parallax measurements[1] but is drifting closer with a heliocentric radial velocity of −44 km/s.[5] At its current distance, HD 174474's brightness is diminished by 0.26 magnitudes due to interstellar dust.[15] It has an absolute magnitude of +1.61.[6]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Telescopium |
Right ascension | 18h 53m 02.34680s[1] |
Declination | −48° 21′ 39.2965″[1] |
Apparent magnitude (V) | 6.17±0.01[2] |
Characteristics | |
Spectral type | A2 V[3] |
U−B color index | +0.08[4] |
B−V color index | +0.14[4] |
Astrometry | |
Radial velocity (Rv) | −44±4[5] km/s |
Proper motion (μ) | RA: −17.178 mas/yr[1] Dec.: −77.772 mas/yr[1] |
Parallax (π) | 13.3771 ± 0.0444 mas[1] |
Distance | 243.8 ± 0.8 ly (74.8 ± 0.2 pc) |
Absolute magnitude (MV) | +1.61[6] |
Details | |
Mass | 2.05±0.04[7] M☉ |
Radius | 1.89±0.10[8] R☉ |
Luminosity | 18.14[9] L☉ |
Surface gravity (log g) | 4.21+0.09 −0.06[10] cgs |
Temperature | 8664±295[11] K |
Metallicity [Fe/H] | −0.11[12] dex |
Age | 630[11] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This is an ordinary A-type main-sequence star with a stellar classification of A2 V.[3] It has double the mass of the Sun and 1.89 times the Sun's radius.[8] It radiates 18.1 times the luminosity of the Sun from its photosphere at an effective temperature of 8,664 K.[11] HD 174474 is slightly metal deficient with an iron abundance 22% below solar levels ([Fe/H] = −0.11). It is estimated to be 630 million years old based on stellar evolution models from David & Hillenbrand (2015).[11]