HD 7977

HD 7977
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]
Distance246.9 ± 0.6 ly
(75.7 ± 0.2 pc)
Details
Mass1.07[1] M☉
Radius1.09[1] R☉
Luminosity1.20[1] L☉
Surface gravity (log g)4.35[1] cgs
Temperature5,816[1] K
Other designations
HD 7977, BD+61°250, SAO 11703
Database references
SIMBADdata

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]

Schematic view to scale of past and future close approaches to the Sun (up to Alpha Centauri), which includes HD 7977
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