Epoch J2000 Equinox J2000
|Right ascension||00h 25m 19.9s|
|Declination||64° 08′ 18.2″|
|Apparent magnitude (V)||17|
|Spectral type||G2 IV|
|B−V color index||0.60 |
|Proper motion (μ)||RA: −2.60  mas/yr
Dec.: −6.11 [ ±1.34]  mas/yr
|Mass||about 1  M☉|
|Radius||2 [ ±1]  R☉|
|Luminosity||about 1 L☉|
|Metallicity||about 100% Sun |
Tycho G is still close to the center of the supernova remnant and had triggered once the explosion of its binary companion white dwarf star by contributing mass to it.
Evidence for companion hypothesis
- Tycho G is traveling at a rate of 136 km/s, which is more than four times faster than the mean velocity of other stars in its stellar neighbourhood.
- Tycho G's metallicity is about 3 times higher than the mean metallicity of other stars in its stellar neighbourhood.
Origin of the name
The postfix "G" originates from the candidate companion stars considered, labelled Tycho A to Tycho V.
- Discovery of the binary companion of Tycho Brahe's supernova
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