V0774 Tauri
catalogues and names
catalogues and names | V0774 Tau, HR 1322, HD 26923, SAO 111698, BD +5 614, WDS 04155+0611A |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
position (J2000) | RA: 4h 15min 29.2sec | DEC: +6° 11' 12'' | ||
position (2000.72) | RA: 4h 15min 31sec | DEC: +6° 11' 18'' | ||
position (B1900) | RA: 4h 10min 9.5sec | DEC: +5° 56' 20'' | ||
proper motion (J2000) | RA: -0.06 arcsec/a | DEC: -0.116 arcsec/a | ||
radial velocity | -8 km/s | |||
rotational velocity | 4 km/s (uncertain) (variable) | |||
galactic coordinates | longitude: 186.68° | latitude: -30.5° |
magnitude
visual magnitude | 6.31 (V on UBV Johnson system) |
spectral / color information
spectral class | G0IV |
B-V-magnitude | 0.59 |
U-B-magnitude | 0.05 |
variability information
variable star identification | V774 Tau |
note (category: variability): | 6.28 - 6.37V. |
double/multiple star system information
number of components of multiple star system | 4 |
separation | 64.7 arcsec |
mag difference (of double or brightest multiple) | 0.6 |
component ID | AB |
note (category: double and multiple data): | CPM with HR 1321. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 4h 15min 28.805sec | DEC: +6° 11' 12.74'' | ±0.2 arcsec | source: 52 |
position (2000.72) | RA: 4h 15min 31sec | DEC: +6° 11' 19'' | JD: 2451809.16 | |
proper motion (J2000) | RA: -0.0073 arcsec/a | DEC: -0.104 arcsec/a | source: 25 | |
radial velocity | -8 km/s | source: 25 | ||
galactic coord. (B1950) | longitude: 186.68° | latitude: -30.5° |
magnitude:
visual | 6.3 (observed) | source: 31 |
photovisual | 6.5 | source: 2 |
photographic | 6.5 | source: 16 |
spectral information:
spectral class | G0 | source: 96 | |
Morgan-Keenan | G0IV | source: 25 | |
B-magnitude | 6.89 ±0.05 | B-V-magnitude | 0.57 |
U-magnitude | 6.93 ±0.05 | U-B-magnitude | 0.04 |
variability information:
variability type | 440 |
var. amplitude | 0.09 |
double/multiple star system information:
separation between brightest and second brightest component | 64.7 arcsec |
magnitude difference between brightest and second brightest component | 0.62 |
position angle | 315 ° |
component | magnitude | spectral class | catalogue(s)/name(s) |
A | 6.3 | G0 | HR 1322, HD 26923, SAO 111698 |
B | 6.94 | G0 | HR 1321, HD 26913, SAO 111695 |
C | 9.158 | M2 |
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 | |
30 | GCVS, 4th edition |
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88 | |
31 | CRM' (non-GCVS variable data) |
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 1994 | |
52 | PPMN-HP subset |
PPMN Star Catalogue (Reference 16) High-Precision Subset (Code H) | |
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: 4h 12min 49.207sec | DEC: +6° 3' 51.24'' | ±0.04 arcsec |
position (2000.72) | RA: 4h 15min 32sec | DEC: +6° 11' 24'' | JD: 2451809.16 |
position (J2000) | RA: 4h 15min 29.17sec | DEC: +6° 11' 12'' | |
proper motion B1950 (FK4) | RA: -0.0042 arcsec/a | DEC: -0.114 arcsec/a | ±0.008 arcsec/a in RA ±0.006 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: -0.004 arcsec/a | DEC: -0.116 arcsec/a | |
source of proper motion data | Determined by source catalog |
magnitude:
visual | 6.5 (accuracy: 2 decimals) |
source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
spectral class | G0 |
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: 5135 |
Durchmusterung | BD+05 614 |
Boss General Catalogue | 5135 |
Henry Draper Catalogue | 26923 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
position (J2000) | RA: 4h 15.5min | DEC: +6° 11' |
proper motion (J2000) | RA: -0.116 arcsec/a | DEC: -0.098 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 | 1783 | 15 | 315° | 65.5'' | 6.34 | 6.96 | G0IV G3V | H 98 |
1957 | - | 64.7'' | ||||||
AC | 1885 | 2 | 47° | 214.5'' | 6.5 | 10.2 | - | H 98 |
1907 | 47° | 215.7'' | ||||||
CD | 1907 | 1 | 139° | 52.7'' | 10.2 | 10.2 | M5 | H 98 |
discoverer information:
discoverer code | discoverer | reference |
H 98 | Herschel, W. | - |
notes:
note | H VI 98. A is V774 Tau. B is a suspected variable, and is BD+05@613. Proper motion of B -097 -109. |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
position (equinox 1950.0) | RA: 4h 12min 49.2sec | DEC: +6° 3' 51'' |
variability informations:
variability type | BY: | rotating variable star |
magnitute at max. brightness | 6.28 | |
magnitute at min. brightness | 6.37 | |
photometric system | visual, photovisual or Johnson's V |
spectral information
spectral class | G0IV-V |
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 | 78/774 |
constellation | Taurus |
notes on existence | The star is equivalent to '0780775 V0775'. |
There are notes in published catalog. |
variability type description
variability type | description |
BY | BY Draconis-type variables, which are emission-line dwarfs of dKe-dMe spectral type showing quasiperiodic light changes with periods from a fraction of a day to 120 days and amplitudes from several hundredths to 0.5 mag in V. The light variability is caused by axial rotation of a star with a variable degree of nonuniformity of the surface brightness (spots) and chromospheric activity. Some of these stars also show flares similar to those of UV Cet stars, and in those cases they also belong to the latter type and are simultaneously considered eruptive variables. |