| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 00h 25m 23.59s[1] |
| Declination | 64° 08′ 02.0″[1] |
| Apparent magnitude (V) | 18.71[2] |
| Characteristics | |
| Spectral type | G0/1 IV[3] |
| Astrometry | |
| Radial velocity (Rv) | −79.22[2] km/s |
| Proper motion (μ) | RA: −2.50[2] mas/yr Dec.: −4.22[2] mas/yr |
| Parallax (π) | 0.5118 ± 0.1208 mas |
| Distance | approx. 6,000 ly (approx. 2,000 pc) |
| Details | |
| Mass | 1.0[3] M☉ |
| Radius | 1.32–2.63[3] R☉ |
| Luminosity | 1.9–7.6[3] L☉ |
| Surface gravity (log g) | 4.0[2] cgs |
| Temperature | 6,025[2] K |
| Metallicity | −0.13[2] |
| Rotational velocity (v sin i) | < 6[2] km/s |
| Age | 5.7[2] Gyr |
| Other designations | |
2MASS J00252358+6408019, [RCM2004]+Tycho G | |
| Database references | |
| SIMBAD | data |
Tycho G has been proposed as the surviving binary companion star of the SN 1572 supernova event. The star is located about 6,400±1,500 light-years away in the constellation Cassiopeia. It is a subgiant, similar to the Sun in temperature, but more evolved and luminous.
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