TV Geminorum
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Gemini |
| Right ascension | 06h 11m 51.41401s |
| Declination | +21° 52′ 05.6452″ |
| Apparent magnitude (V) | 6.27 - 7.50 |
| Characteristics | |
| Spectral type | K5.5 - M1.3 Iab + B4 III: |
| U−B color index | +1.77 |
| B−V color index | +2.25 |
| Variable type | SRc |
| Astrometry | |
| Radial velocity (Rv) | +20.42 km/s |
| Proper motion (μ) | RA: −0.575 mas/yr Dec.: −2.598 mas/yr |
| Parallax (π) | 0.3197±0.1301 mas |
| Distance | 1,500 pc |
| Absolute magnitude (MV) | -6.31 |
| Details | |
| Mass | 14 M☉ |
| Radius | 620 – 710 (pulsation) R☉ |
| Luminosity | 62,000 - 89,000 L☉ |
| Temperature | 3,500 - 3,850 K |
| Other designations | |
| TV Gem, BD+21°1146, SAO 78092, HD 42475, HR 2190, HIP 29416 | |
| Database references | |
| SIMBAD | data |
TV Geminorum (TV Gem / HD 42475 / HR 2190) is a variable red supergiant in the constellation Gemini. Its visual magnitude varies from 6.3 to 7.5, making it very faintly visible to the naked eye of an observer with excellent observing conditions, when the star is near its peak brightness.