r Tauri
catalogues and names
catalogues and names | r Tau, rho Tau, 86 Tau, HR 1444, HD 28910, SAO 94007, BD +14 720, FK5: 1125 |
constellation | Taurus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
position (J2000) | RA: 4h 33min 50.9sec | DEC: +14° 50' 40'' | ||
position (2000.73) | RA: 4h 33min 53sec | DEC: +14° 50' 45'' | ||
position (B1900) | RA: 4h 28min 10.3sec | DEC: +14° 38' 3'' | ||
proper motion (J2000) | RA: 0.103 arcsec/a | DEC: -0.027 arcsec/a | ||
radial velocity | 40 km/s note: spectroscopic binaries, double lined spectra note: orbital data avaible |
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rotational velocity | 117 km/s (uncertain) (variable) | |||
trigonometric parallax | 0.026 arcsec | |||
galactic coordinates | longitude: 182.05° | latitude: -21.67° |
magnitude
visual magnitude | 4.65 (V on UBV Johnson system) |
spectral / color information
spectral class | A8V |
B-V-magnitude | 0.25 |
U-B-magnitude | 0.08 |
R-I-magnitude |
variability information
variable star identification | Rho Tau |
double/multiple star system information
note (category: spectroscopic binaries): | 488.5d, K 18.5k/s, V0 +30.3k/s, asini 124. Unresolved by speckle interferometry. |
miscellaneous information
note (category: group membership): | In Hyades cluster; Mel 25 #95. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 4h 33min 50.914sec | DEC: +14° 50' 39.82'' | ±0.06 arcsec | source: 15 |
position (2000.73) | RA: 4h 33min 53sec | DEC: +14° 50' 45'' | JD: 2451810.88 | |
proper motion (J2000) | RA: 0.0071 arcsec/a | DEC: -0.027 arcsec/a | source: 25 | |
radial velocity | 40 km/s | source: 25 | ||
trigonometric parallax | 0.026 arcsec | ±0.003 arcsec | source: 25 | |
galactic coord. (B1950) | longitude: 182.05° | latitude: -21.67° |
magnitude:
visual | 4.65 (observed) | source: 25 |
photovisual | 4.8 | source: 2 |
spectral information:
spectral class | A5 | source: 96 | |
Morgan-Keenan | A8V | source: 25 | |
B-magnitude | 4.9 ±0.05 | B-V-magnitude | 0.25 |
U-magnitude | 4.98 ±0.05 | U-B-magnitude | 0.08 |
variability information:
variability type | 10 |
var. amplitude | 0.01 |
var. period | 0.07 |
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 | |
15 | FK5, FK5 Extension and FK5 Supplement |
Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 1991 | |
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: 4h 31min 0.44sec | DEC: +14° 44' 27.45'' | ±0.005 arcsec |
position (2000.73) | RA: 4h 33min 53sec | DEC: +14° 50' 46'' | JD: 2451810.88 |
position (J2000) | RA: 4h 33min 50.899sec | DEC: +14° 50' 39.83'' | |
proper motion B1950 (FK4) | RA: 0.0069 arcsec/a | DEC: -0.025 arcsec/a | ±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: 0.0069 arcsec/a | DEC: -0.026 arcsec/a | |
source of proper motion data | Determined by source catalog |
magnitude:
visual | 4.8 (accuracy: 2 decimals) |
source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
spectral class | A5 |
source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
source catalogue | FK4, catalogue number: 1125 |
Durchmusterung | BD+14 720 |
Boss General Catalogue | 5558 |
Henry Draper Catalogue | 28910 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
position (equinox 1950.0) | RA: 4h 31min 0.4sec | DEC: +14° 44' 27'' |
variability informations:
variability type | DSCTC | pulsating variable star |
magnitute at max. brightness | 4.9 | |
magnitute amplitude | 0.01 | |
photometric system | ||
period [d] | 0.067 |
spectral information
spectral class | A8Vn |
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 | 78/9017 |
constellation | Taurus |
notes on existence | The star is equivalent to '0789020 ups'. |
There are notes in published catalog. |
variability type description
variability type | description |
DSCTC | Variables of the Delta Scuti type. These are pulsating variables of spectral types A0-F5 III-V displaying light amplitudes from 0.003 to 0.9 mag in V (usually several hundredths of a magnitude) and periods from 0.01 to 0.2 days. The shapes of the light curves, periods, and amplitudes usually vary greatly. Radial as well as nonradial pulsations are observed. The variability of some members of this type appears sporadically and sometimes completely ceases, this being a consequence of strong amplitude modulation with the lower value of the amplitude not exceeding 0.001 mag in some cases. The maximum of the surface layer expansion does not lag behind the maximum light for more than 0.1 periods. DSCT stars are representatives of the galactic disk (flat component) and are phenomenologically close to the SX Phe variables. DSCTC Low amplitude group of Delta Sct variables (light amplitude <0.1 mag in V). The majority of this type's representatives are stars of luminosity class V; objects of this subtype generally are representative of the Delta Sct variables in open clusters. |