70 Ophiuchi A
4.03
Apparent Mag16.58
Distance (ly)K0V
Spectral Type5,300
Temperature (K)70 Ophiuchi A is the primary component of one of the best-known binary star systems in the sky. This K-type main-sequence star and its K5V companion orbit each other in 88.3 years and are easily split with small telescopes.
Stellar Data
Apparent Magnitude4.03
Absolute Magnitude5.5
Distance16.58 light-years
Spectral TypeK0V
Temperature5,300 K
Luminosity0.6 L☉
Radius0.89 R☉
Mass0.9 M☉
Right Ascension18h 05m 27.3s
Declination+02° 30′ 00″
ConstellationOphiuchus
Notable Facts
- One of the best-known visual binary stars for amateur astronomers
- Orbital period of 88.3 years
- Subject of a historical but spurious planetary detection claim in the 19th century