FR Scuti
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Scutum |
| Right ascension | 18h 23m 22.79s |
| Declination | −12° 40′ 51.8″ |
| Apparent magnitude (V) | 10.0 – 10.8 |
| Characteristics | |
| Evolutionary stage | Red supergiant + OB stars |
| Spectral type | M2.5Iabep + B |
| Variable type | Algol + LC |
| Astrometry | |
| Radial velocity (Rv) | +22.16 km/s |
| Proper motion (μ) | RA: +0.187 mas/yr Dec.: −1.64 mas/yr |
| Parallax (π) | 0.4154±0.0667 mas |
| Distance | approx. 8,000 ly (approx. 2,400 pc) |
| Other designations | |
| FR Sct, HIP 90115, TIC 119217144, TYC 5698-2284-1, IRAS 18205-1242, 2MASS J18232280-1240518, SDSS J143900.24+641730.1 | |
| Database references | |
| SIMBAD | data |
FR Scuti (also known as FR Sct or HIP 90115) is a hierarchical triple star system located in the constellation of Scutum. It is classified as a VV Cephei-type system, which typically consists of a cool red supergiant and a hot companion, but in this case the hot component is itself a close binary, making the overall system a triple. It was once thought to be a symbiotic binary, exhibiting unique spectral emission lines and photometric variability, but is now though to be a detached eclipsing binary with additional irregular pulsations of the cool supergiant. Another star system similar to FR Scuti is TIC 290061484.