| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 19h 15m 24.85937s[1] |
| Declination | +30° 31′ 34.9760″[1] |
| Apparent magnitude (V) | 5.88[2] |
| Characteristics | |
| Spectral type | M1IIIab[2] |
| U−B color index | +2.03 |
| B−V color index | +1.665±0.007[2] |
| Astrometry | |
| Radial velocity (Rv) | −64.43±0.23[1] km/s |
| Proper motion (μ) | RA: 34.425[1] mas/yr Dec.: −26.081[1] mas/yr |
| Parallax (π) | 2.37 ± 0.61 mas[1] |
| Distance | approx. 1,400 ly (approx. 400 pc) |
| Absolute magnitude (MV) | −2.03[2] |
| Details | |
| Radius | 68+12 −13[1] R☉ |
| Luminosity | 1,002±34[1] L☉ |
| Temperature | 3,947+433 −305[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 180450 is a single[4] star in the northern constellation of Lyra, positioned about half a degree to the NNW of the globular cluster M56.[5] At an apparent visual magnitude of 5.88,[2] it is dimly visible to the naked eye under good viewing conditions. This star is located at a distance of approximately 1,400 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −64.4 km/s.[1]
This is an aging red giant star with a stellar classification of M1IIIab,[2] It is currently on the asymptotic giant branch,[6] having exhausted the supply of hydrogen in its core and evolved of the main sequence. It has expanded to ~68 times the radius of the Sun and is radiating a thousand times the Sun' luminosity from its enlarged photosphere at en effective temperature of 3,947 K.[1]
GaiaDR2 was invoked but never defined (see the help page).Anderson_Francis_2012 was invoked but never defined (see the help page).SIMBAD was invoked but never defined (see the help page).Eggleton_Tokovinin_2008 was invoked but never defined (see the help page).Sinnott_Perryman_1997 was invoked but never defined (see the help page).Eggen1992 was invoked but never defined (see the help page).