catalogues and names

The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

Combined General Catalogue of Variable Stars (Vol. I-III)

catalogues and names

catalogues and names	w Oph, ome Oph, 9 Oph, HR 6153, HD 148898, SAO 184450, BD -21 4381, FK5: 3307
constellation	Ophiuchus

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)

position, motion, parallax:

position (J2000)	RA: 16h 32min 8.2sec	DEC: -21° 27' 59''
position (2000.72)	RA: 16h 32min 11sec	DEC: -21° 28' 4''
position (B1900)	RA: 16h 26min 12.4sec	DEC: -21° 15' 9''
proper motion (J2000)	RA: 0.028 arcsec/a	DEC: 0.039 arcsec/a
radial velocity	3 km/s
rotational velocity	41 km/s (uncertain) (variable)
trigonometric parallax	0.028 arcsec
galactic coordinates	longitude: 356.3°	latitude: 17.83°

magnitude

visual magnitude

4.45 (V on UBV Johnson system)

spectral / color information

spectral class	A7p
B-V-magnitude	0.13
U-B-magnitude	0.13
R-I-magnitude

variability information

variable star identification

Ome Oph

note (category: variability):

Alpha CV, 4.45 - 4.51V, 1.79 or 4.67d.

miscellaneous information

note (category: group membership):

Possible Eggen group with HR 63, q.v.

data from SKY2000 - Master Star Catalog (Myers+ 1997)

position, motion, parallax:

position (J2000)	RA: 16h 32min 8.22sec	DEC: -21° 27' 58.86''	±0.19 arcsec	source: 16
position (2000.72)	RA: 16h 32min 11sec	DEC: -21° 28' 4''	JD: 2451809.25
proper motion (J2000)	RA: 0.0019 arcsec/a	DEC: 0.032 arcsec/a		source: 25
radial velocity	3 km/s			source: 25
trigonometric parallax	0.028 arcsec		±0.003 arcsec	source: 25
galactic coord. (B1950)	longitude: 356.3°	latitude: 17.83°

magnitude:

visual	4.44 (observed)	source: 30
photovisual	4.4	source: 16
photographic	4.9	source: 2

spectral information:

spectral class	F0		source: 96
Morgan-Keenan	A7p		source: 25
B-magnitude	4.58 ±0.05	B-V-magnitude	0.13
U-magnitude	4.71 ±0.05	U-B-magnitude	0.13

variability information:

source of data: 30

variability type	160
var. amplitude	0.07
var. period	2.99

sources:

2	HD and HDE Catalogs
Cannon, A.J., and E.C. Pickering, Harvard Annals, Vols 91-99, 1918-24, Cambridge, Massachusetts: Harvard University; Cannon, A.J., Harvard Annals, Vol. 100, 1925-36, Cambridge, Massachusetts: Harvard University; and Cannon, A.J., and M. Walton Mayall, Harvard Annals, Vol. 112, 1949, Cambridge, Massachusetts: Harvard University
16	PPM North and PPM South Catalogs and PPM Supplement
Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993
25	Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994
30	GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
96	SAO or HD/HDE Catalog
Reference from Value 1 or Reference from Value 2

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (B1950)	RA: 16h 29min 10.062sec	DEC: -21° 21' 39.92''	±0.015 arcsec
position (2000.72)	RA: 16h 32min 11sec	DEC: -21° 28' 6''	JD: 2451809.25
position (J2000)	RA: 16h 32min 8.126sec	DEC: -21° 27' 59.06''
proper motion B1950 (FK4)	RA: 0.0009 arcsec/a	DEC: 0.034 arcsec/a	±0.003 arcsec/a in RA ±0.003 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0009 arcsec/a	DEC: 0.037 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.6 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	F0
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	GC, catalogue number: 22221
Durchmusterung	BD-21 4381
Boss General Catalogue	22221
Henry Draper Catalogue	148898

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)

position:

position (equinox 1950.0)

RA: 16h 29min 10.1sec

DEC: -21° 21' 40''

variability informations:

variability type	ACV	rotating variable star
magnitute at max. brightness	4.44
magnitute at min. brightness	4.51
photometric system	visual, photovisual or Johnson's V
period [d]	2.99 (uncertain)

spectral information

spectral class

A7p(Sr-Cr)

references

to a study	Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph	no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'

miscanellous

ID in the GCVS catalogue	59/9024
constellation	Ophiuchus
notes on existence	The star is equivalent to '0600001 R'.
There are notes in published catalog.

variability type description

variability type

description

ACV

Alpha2 Canum Venaticorum variables. These are main-sequence stars with spectral types B8p-A7p and displaying strong magnetic fields. Spectra show abnormally strong lines of Si, Sr, Cr, and rare earths whose intensities vary with rotation. They exhibit magnetic field and brightness changes (periods of 0.5-160 days or more). The amplitudes of the brightness changes are usually withine 0.01-0.1 mag in V. ACVO Rapidly oscillating Alpha2 CVn variables. These are nonradially pulsating, rotating magnetic variables of Ap spectral type (DO Eri). Pulsation periods are in the range of 6-12 mmag (0.004-0.01 days), while amplitudes of light variation caused by the pulsation are about 0.01 mag in V. The pulsational variations are superposed on those caused by rotation.