b2Tucanae
catalogues and names | b2Tuc, HR 127, HD 2885, SAO 248202, WDS 00315-6257C |
constellation | Tucana |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
position (J2000) | RA: 0h 31min 33,6sec | DEC: -62° 57' 57'' |
position (J1900) | RA: 0h 26min 58,4sec | DEC: -63° 31' 0'' |
proper motion (J2000) | RA: 0,101 arcsec/a | DEC: -0,056 arcsec/a |
radial velocity | 10 km/s | |
rotational velocity | 50 km/s (uncertain) (variable) | |
trigonometric parallax | 0,03 arcsec |
note (category: dynamical parallaxes): | 0.020". |
magnitude
visual magnitude | 4,54 (V on UBV Johnson system) |
spectral / color information
spectral class | A2V+A7V |
B-V-magnitude | 0,15 |
U-B-magnitude | 0,03 |
R-I-magnitude | 0,08 |
double/multiple star system information
number of components of multiple star system | 6 |
separation | 27 arcsec |
mag difference (of double or brightest multiple) | 0,2 |
component ID | AC |
note | Worley (1978) update of the IDS |
note (category: double and multiple data): | CD 4.9 A2V, 5.6 A7V, 44.43y, a = 0.385". Combined mag., colors. D-C = 1.17V. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 0h 31min 33,555sec | DEC: -62° 57' 56,14'' | ±0,19 arcsec | source: 16 |
proper motion (J2000) | RA: 0,0161 arcsec/a | DEC: -0,057 arcsec/a | source: 25 | |
radial velocity | 10 km/s | source: 25 | ||
trigonometric parallax | 0,03 | ±0,003 arcsec | source: 25 | |
galactic coord. (B1950) | longitude: 306,77° | latitude: -54,01° | ||
GCI unit vector (J2000) | X: 0,450223 | Y: 0,062392 | Z: -0,890734 |
magnitude:
visual | 4,54 (observed) | source: 25 |
photovisual | 4,1 | source: 16 |
photographic | 4,5 | source: 2 |
spectral information:
spectral class | B9 | source: 96 | |
Morgan-Keenan | A2V | source: 25 | |
B-magnitude | 4,69 ±0,05 | B-V-magnitude | 0,15 |
U-magnitude | 4,72 ±0,05 | U-B-magnitude | 0,03 |
double/multiple star system information:
separation between brightest and second brightest component | 2,4 arcsec |
magnitude difference between brightest and second brightest component | 9,1 |
position angle | 151 ° |
component | magnitude | spectral class | catalogue(s)/name(s) |
A | 4,37 | B9 | b1Tucanae, HR 126, HD 2884, SAO 248201 |
B | 4,54 | B9 | b2Tucanae, HR 127, HD 2885, SAO 248202 |
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 | |
19 | WDS Catalog |
Worley, C.E., and G.G. Douglass, Washington Catalog of Visual Double Stars 1996.0, United States Naval Observatory, 1996 | |
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 (J1950) | RA: 0h 29min 16,518sec | DEC: -63° 14' 27,5'' | ±0,032 arcsec |
position (J2000) | RA: 0h 31min 33,571sec | DEC: -62° 57' 56,53'' | |
proper motion J1950 (FK4) | RA: 0,0156 arcsec/a | DEC: -0,052 arcsec/a | ±0,005 arcsec/a in RA ±0,005 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: 0,0148 arcsec/a | DEC: -0,056 arcsec/a | |
source of proper motion data | Determined by source catalog |
magnitude:
visual | 4,5 (accuracy: 2 decimals) |
source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
spectral class | A2 |
source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
remarks for duplicity and variability
Double star in Aitken's Double Star Catalogue (Aitken 1932) |
catalogues
source catalogue | GC, catalogue number: 626 |
Durchmusterung | CP-63 50C |
Boss General Catalogue | 626 |
Henry Draper Catalogue | 2885 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
position (J2000) | RA: 0h 31,5min | DEC: -62° 57' |
proper motion (J2000) | RA: 0,084 arcsec/a | DEC: -0,058 arcsec/a |
double/multiple star system information:
component | year | number of measures | position angle | angular separation | magnitude of 1st component | magnitude of 2nd component | spectral class(es) | discoverer code |
AB | 1926 | 2 | 151° | 2,4'' | 4,36 | 13,5 | B9V | B 7 |
AC | 1835 | 26 | 172° | 27'' | 4,36 | - | - | LCL 119 |
1990 | 168° | - | ||||||
CD | 1900 | 50 | ° | '' | 4,8 | 6 | A2V+A7V | I 260 |
discoverer information:
discoverer code | discoverer | reference |
B 7 | Bos, W.H. van den | (Bull. Astron. Inst. Neth. 4, 109; 1927.) |
LCL 119 | Lacaille, N.L. | - |
I 260 | Innes, R.T.A. | - |
notes:
note | Beta (1) Tuc. A is a spectroscopic binary. Proper motion of B +089 -048. Beta (1) and Beta (2) Tuc. Beta (2) Tuc. P = 44yr., a = 0.38", motion retrograde. |