Chi Ophiuchi

χ Ophiuchi

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Ophiuchus
Right ascension	16h 27m 01.4349s[1]
Declination	−18° 27′ 22.504″[1]
Apparent magnitude (V)	4.18 to 5.0[2]
Characteristics
Spectral type	B2Vne[1]
U−B color index	−0.75[3]
B−V color index	+0.28[3]
R−I color index	+0.22[3]
Variable type	GCAS[2]
Astrometry
Radial velocity (Rv)	−3.2 ± 5[1] km/s
Proper motion (μ)	RA: −5.58[1] mas/yr Dec.: −22.22[1] mas/yr
Parallax (π)	6.67 ± 0.74[1] mas
Distance	approx. 490 ly (approx. 150 pc)
Absolute magnitude (MV)	−1.3[4]
Details
Radius	4.5[5] R☉
Rotational velocity (v sin i)	134[3] km/s
Other designations
χ Oph, Chi Ophiuchi, Chi Oph, 7 Ophiuchi, 7 Oph, BD−18 4282, FK5 3298, GC 22117, HD 148184, HIP 80569, HR 6118, PPM 231703, SAO 159918.[1]
Database references
SIMBAD	data

Chi Ophiuchi (Chi Oph / χ Ophiuchi / χ Oph) is a Be star in the constellation of Ophiuchus.^[1] It has an apparent visual magnitude which varies between 4.18 and 5.0.^[2]

References

1. ^ ^{a b c d e f g h i} * chi Oph -- Be Star, database entry, SIMBAD. Accessed on line January 12, 2011.
2. ^ ^{a b c} khi Oph, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line January 12, 2011.
3. ^ ^{a b c d} HR 6118, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line January 12, 2011.
4. ^ From apparent magnitude and parallax.
5. ^ HD 148184, database entry, Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS), 3rd edition, L. E. Pasinetti-Fracassini, L. Pastori, S. Covino, and A. Pozzi, CDS ID II/224. Accessed on line January 12, 2011.