HD 176664
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  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 19h 03m 57.55905s[1] |
| Declination | −51° 01′ 06.9715″[1] |
| Apparent magnitude (V) | 5.93±0.01[2] |
| Characteristics | |
| Spectral type | K0/1 III[3] |
| B−V color index | +1.24[4] |
| Astrometry | |
| Radial velocity (Rv) | −60.2±0.4[5] km/s |
| Proper motion (μ) | RA: +40.300 mas/yr[1] Dec.: −147.992 mas/yr[1] |
| Parallax (π) | 11.1536±0.0456 mas[1] |
| Distance | 292 ± 1 ly (89.7 ± 0.4 pc) |
| Absolute magnitude (MV) | +0.94[6] |
| Details | |
| Mass | 1.17[7] M☉ |
| Radius | 12.4±0.6[8] R☉ |
| Luminosity | 49.9±0.4[1] L☉ |
| Surface gravity (log g) | 2.42[7] cgs |
| Temperature | 4,546±122[9] K |
| Metallicity [Fe/H] | +0.25[10] dex |
| Rotational velocity (v sin i) | <1[11] km/s |
| Age | 377[1] Myr |
| Other designations | |
| 43 G. Telescopii[12], CD−51°11893, CPD−51°11104, HD 176664, HIP 93624, HR 7190, SAO 245899, CCDM J19040-5101A, WDS J19040-5101A[13] | |
| Database references | |
| SIMBAD | data |
HD 176664, also known as HR 7190 or rarely 43 G. Telescopii, is a solitary star located in the southern constellation Telescopium. It is faintly visible to the naked eye as an orange-hued star with an apparent magnitude of 5.93.[2] The object is located relatively close at a distance of 292 light years based on Gaia DR3 parallax measurements[1] but is rapidly approaching the Solar System with a heliocentric radial velocity of −60 km/s.[5] At its current distance HD 176664's brightness is diminished by two-tenths of a magnitude due to interstellar dust.[14] It has an absolute magnitude of +0.94.[6]
HD 176664 has a stellar classification of K0/1 III, indicating that it is an evolved K-type star with a spectrum intermediate of a K0 and K1 giant star. It has a comparable mass to the Sun[7] but it has expanded to 12.4 times its girth.[8] It radiates 49.9 times the luminosity of the Sun[1] from its enlarged photosphere at an effective temperature of 4,546 K.[9] HD 176664 is metal enriched ([Fe/H] = +0.25) and spins too slowly to be measured accurately.[11] A 1993 paper by Olin J. Eggen lists HD 176664 as a member of the Milky Way's old disk population.[10]
The star has two optical companions designated CD −51°11893B and CD −51°11893C. B is a distant 13th magnitude star located 19.4" away along a position angle of 9° while C is a 12th magnitude star located 27.5" away along a position angle of 29°.[15]
