Rho Scorpii

Rho Scorpii

Observation data Epoch J2000      Equinox J2000
Constellation	Scorpius
Right ascension	15^h 56^m 53.07624^s [1]
Declination	−29° 12′ 50.6612″ [1]
Apparent magnitude (V)	3.86 [2]
Characteristics
Spectral type	B2IV [3]
U−B color index	-0.82 [2]
B−V color index	-0.20 [2]
Astrometry
Radial velocity (Rv)	-0.40[4] km/s
Proper motion (μ)	RA: -15.68[1] mas/yr Dec.: -24.88[1] mas/yr
Parallax (π)	6.91 ± 0.19[1] mas
Distance	470 ± 10 ly (145 ± 4 pc)
Absolute magnitude (MV)	-1.94 [5]
Other designations
5 Scorpii, CCDM J15569-2913A, FK5 3258, GC 21398, HIP 78104, HR 5928, HD 142669, SAO 183957, ADS 9846 [3]
Database references
SIMBAD	data

Rho Scorpii (ρ Sco, ρ Scorpii) is a binary star in the constellation Scorpius. It is approximately 472 light years from Earth.^[1]

The primary component, Rho Scorpii A, is a blue-white B-type subgiant with an apparent magnitude of +3.87. Orbiting it with a separation of 38 arcseconds is the magnitude +12.8 Rho Scorpii B.^[6]

References

1. van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
2. Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237: 0. Bibcode:2002yCat.2237....0D.
3. "Rho Scorpii". SIMBAD Astronomical Database. Retrieved 2015-10-17.
4. Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick, Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, University of Toronto: International Astronomical Union, Bibcode:1967IAUS...30...57E
5. Absolute magnitude calculated as $M = m + 5 (1 + \log_{10}{p})\!\,$, where $M$ is the star's absolute magnitude, $m$ is the star's apparent magnitude, and $p$ is the star's measured parallax in arcseconds.
6. Dommanget, J.; et al. (2002), "Catalog of Components of Double & Multiple stars", Observations et Travaux 54 (5), Bibcode:2002yCat.1274....0D Vizier result