Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Cassiopeia |
Right ascension | 01h 20m 31.596s[1] |
Declination | +61° 52′ 57.01″[1] |
Apparent magnitude (V) | 9.04[2] |
Characteristics | |
Spectral type | G3[3] |
Astrometry | |
Proper motion (μ) | RA: +0.144[1] mas/yr Dec.: +0.010[1] mas/yr |
Parallax (π) | 13.2118 ± 0.0322 mas[1] |
Distance | 246.9 ± 0.6 ly (75.7 ± 0.2 pc) |
Details | |
Mass | 1.07[1] M☉ |
Radius | 1.09[1] R☉ |
Luminosity | 1.20[1] L☉ |
Surface gravity (log g) | 4.35[1] cgs |
Temperature | 5,816[1] K |
Other designations | |
Database references | |
SIMBAD | data |
HD 7977 (also designated as TYC 4034-1077-1 or USNO-A2 1500-01356484) is a G-type main-sequence star located in the constellation of Cassiopeia, around 246.9 light-years away from Earth. HD 7977 is notable for its close flyby of the Solar System 2.8 million years ago. [4] Its flyby may have taken it close enough to the Sun that it penetrated deep into the Oort Cloud and disturbed the population of Oort Cloud bodies and long-period comets there. [5] Its mass is equivalent to 1.07 times the Sun's mass.[6]