catalogues and names

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

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

catalogues and names

catalogues and names	101 Her, HR 6794, HD 166230, SAO 85770, BD +20 3675
constellation	Hercules

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

position, motion, parallax:

position (J2000)	RA: 18h 8min 52.9sec	DEC: +20° 2' 43''
position (B1900)	RA: 18h 4min 34.1sec	DEC: +20° 1' 46''
proper motion (J2000)	RA: 0.008 arcsec/a	DEC: -0.02 arcsec/a
radial velocity	-16 km/s note: suspected variable radial velocity
rotational velocity	54 km/s (uncertain) (variable)
trigonometric parallax	0.015 arcsec
galactic coordinates	longitude: 46.68°	latitude: 18.1°

magnitude

visual magnitude

5.1 (V on UBV Johnson system)

spectral / color information

spectral class	A8III
B-V-magnitude	0.15
U-B-magnitude	0.18

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

position, motion, parallax:

position (J2000)	RA: 18h 8min 52.851sec	DEC: +20° 2' 42.5''	±0.35 arcsec	source: 17
proper motion (J2000)	RA: 0.0006 arcsec/a	DEC: -0.026 arcsec/a		source: 25
radial velocity	-16 km/s			source: 25
trigonometric parallax	0.015 arcsec		±0.002 arcsec	source: 25
galactic coord. (B1950)	longitude: 46.69°	latitude: 18.1°

magnitude:

visual	5.1 (observed)	source: 25
photovisual	5.2	source: 2
photographic	5.3	source: 16

spectral information:

spectral class	A3		source: 96
Morgan-Keenan	A8III		source: 25
B-magnitude	5.25 ±0.05	B-V-magnitude	0.15
U-magnitude	5.43 ±0.05	U-B-magnitude	0.18

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
17	ACRS
Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 1991
25	Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994
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: 18h 6min 43.406sec	DEC: +20° 2' 9.74''	±0.019 arcsec
position (J2000)	RA: 18h 8min 52.859sec	DEC: +20° 2' 42.89''
proper motion B1950 (FK4)	RA: 0.0005 arcsec/a	DEC: -0.021 arcsec/a	±0.004 arcsec/a in RA ±0.003 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0006 arcsec/a	DEC: -0.02 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5.2 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	A3
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	GC, catalogue number: 24743
Durchmusterung	BD+20 3675
Boss General Catalogue	24743
Henry Draper Catalogue	166230