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	21 Vir, HR 4781, HD 109309, SAO 138845, BD -8 3372
constellation	Virgo

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

position, motion, parallax:

position (J2000)	RA: 12h 33min 46.8sec	DEC: -9° 27' 7''
position (B1900)	RA: 12h 28min 37sec	DEC: -8° 54' 1''
proper motion (J2000)	RA: -0.08 arcsec/a	DEC: 0.007 arcsec/a
radial velocity	-11 km/s note: variable radial velocity
rotational velocity	110 km/s (uncertain) (variable)
trigonometric parallax	0.019 arcsec
galactic coordinates	longitude: 295.66°	latitude: 53.17°

magnitude

visual magnitude

5.48 (V on UBV Johnson system)

spectral / color information

spectral class	A0V
B-V-magnitude	-0.03
U-B-magnitude	-0.1

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

position, motion, parallax:

position (J2000)	RA: 12h 33min 46.72sec	DEC: -9° 27' 7.34''	±0.19 arcsec	source: 16
proper motion (J2000)	RA: -0.0062 arcsec/a	DEC: 0.005 arcsec/a		source: 25
radial velocity	-11 km/s			source: 25
trigonometric parallax	0.019 arcsec		±0.002 arcsec	source: 25
galactic coord. (B1950)	longitude: 295.67°	latitude: 53.17°

magnitude:

visual	5.48 (observed)	source: 25
photovisual	5.6	source: 16
photographic	5.4	source: 2

spectral information:

spectral class	A0		source: 96
Morgan-Keenan	A0V		source: 25
B-magnitude	5.45 ±0.05	B-V-magnitude	-0.03
U-magnitude	5.35 ±0.05	U-B-magnitude	-0.1

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
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: 12h 31min 11.72sec	DEC: -9° 10' 35.01''	±0.015 arcsec
position (J2000)	RA: 12h 33min 46.761sec	DEC: -9° 27' 6.91''
proper motion B1950 (FK4)	RA: -0.0057 arcsec/a	DEC: 0.001 arcsec/a	±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0054 arcsec/a	DEC: 0.007 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5.4 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	A0
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	GC, catalogue number: 17122
Durchmusterung	BD-08 3372
Boss General Catalogue	17122
Henry Draper Catalogue	109309