Iota¹ Scorpii

Iota¹ Scorpii
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius
Right ascension 17h 47m 35.1s
Declination −40° 07′ 37″
Apparent magnitude (V) 3.02
Characteristics
Spectral type F2 Iae
U−B color index 0.27
B−V color index 0.51
Astrometry
Radial velocity (Rv) −27.6 km/s
Proper motion (μ) RA: 0.44 mas/yr
Dec.: −6.40 mas/yr
Parallax (π) 1.82 ± 0.73 mas
Distance approx. 1800 ly
(approx. 500 pc)
Absolute magnitude (MV) -5.68
Details
Mass 12 M
Radius 125 R
Luminosity 29,000 L
Temperature 6,700 K
Rotation 36 km/s
Other designations
HR 6615, CD -40°11838, HD 161471, SAO 228420, FK5 666, HIP 87073.

Iota¹ Scorpii is a yellow-white F-type supergiant with an apparent magnitude of +3.02. (Different sources give apparent magnitudes in the range 2.99–3.03.) It is approximately 1800 light years from Earth. It has a 13th magnitude companion 37.5 arcseconds, or at least 20,000 astronomical units (AU), away from it.

External links