BU Ceti
catalogues and names
| catalogues and names | BU Cet, 13 Cet, HR 142, HD 3196, SAO 128839, BD -4 62, WDS 00352-0336A |
| constellation | Cetus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 0h 35min 14.9sec | DEC: -3° 35' 34'' | ||
| position (B1900) | RA: 0h 30min 6sec | DEC: -4° 8' 36'' | ||
| proper motion (J2000) | RA: 0.413 arcsec/a | DEC: -0.026 arcsec/a | ||
| radial velocity | 9 km/s note: spectroscopic binaries note: orbital data avaible |
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| rotational velocity | 18 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.06 arcsec | |||
| galactic coordinates | longitude: 112.89° | latitude: -66.15° | ||
| note (category: dynamical parallaxes): | 0.049". |
magnitude
| visual magnitude | 5.2 (V on UBV Johnson system) |
spectral / color information
| spectral class | F8V |
| B-V-magnitude | 0.56 |
| U-B-magnitude | 0.08 |
| note (category: spectra): | A possible overluminous system of about one solar mass. |
variability information
| variable star identification | 212 |
| note (category: variability): | ADS 490A?, Delta Sct?, 5.18 - 5.22V. |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 0.3 arcsec |
| mag difference (of double or brightest multiple) | 0.7 |
| component ID | AB |
| note (category: double and multiple data): | AB 5.6 F7V, 6.3 G0V, 6.92y, a = 0.23". Combined mag., colors, spectrum. |
| note (category: spectroscopic binaries): | ADS 490A, 2.0819d, K 38.4k/s, V0 +11k/s, asini 1.10. |
miscellaneous information
| note (category: group membership): | Hyades group. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 0h 35min 14.894sec | DEC: -3° 35' 34.14'' | ±0.19 arcsec | source: 16 |
| proper motion (J2000) | RA: 0.0281 arcsec/a | DEC: -0.022 arcsec/a | source: 25 | |
| radial velocity | 9 km/s | source: 25 | ||
| trigonometric parallax | 0.06 arcsec | ±0.006 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 112.91° | latitude: -66.15° | ||
magnitude:
| visual | 5.2 (observed) | source: 25 |
| photovisual | 5 | source: 16 |
| photographic | 5.8 | source: 2 |
spectral information:
| spectral class | G0 | source: 96 | |
| Morgan-Keenan | F8V | source: 25 | |
| B-magnitude | 5.76 ±0.05 | B-V-magnitude | 0.56 |
| U-magnitude | 5.84 ±0.05 | U-B-magnitude | 0.08 |
double/multiple star system information:
| magnitude difference between brightest and second brightest component | 0.8 |
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 (B1950) | RA: 0h 32min 40.371sec | DEC: -3° 52' 4.29'' | ±0.009 arcsec |
| position (J2000) | RA: 0h 35min 14.872sec | DEC: -3° 35' 34.29'' | |
| proper motion B1950 (FK4) | RA: 0.0274 arcsec/a | DEC: -0.021 arcsec/a | ±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0276 arcsec/a | DEC: -0.026 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 | 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: 696 |
| Durchmusterung | BD-04 62 |
| Boss General Catalogue | 696 |
| Henry Draper Catalogue | 3196 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 0h 35.2min | DEC: -3° 36' |
| proper motion (J2000) | RA: 0.42 arcsec/a | DEC: -0.028 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 | 1887 | often | ° | '' | 5.6 | 6.4 | F8V | HO 212 |
| AB-C | 1877 | 17 | 65° | 37.1'' | - | 12.5 | - | BU 490 |
| 1922 | 43° | 24.5'' |
discoverer information:
| discoverer code | discoverer | reference |
| HO 212 | Hough, G.W. | - |
| BU 490 | Burnham, S.W. | - |
notes:
| note | 13 Cet. P = 6.9yr., a = 0.24", motion direct. A is a spectroscopic binary, and may be a Delta Scuti-type variable. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
| position (B1900) | RA: 0h 30.1min | DEC: -4° 9' |
magnitudes, spectral classes, orbital elements:
| author: | G. Gatewood, A.L. Behall |
| date of observation: | 1970 |
| magnitude of component A: | 5.7 |
| magnitude of component B: | 5.7 |
| spectral class component B: | F8V |
| spectral class component B: | F8V |
| period [y]: | 6.92 |
| semi-major axis [arcsec]: | 0.23 |
| inclination [deg]: | 45.6 |
| node [deg]: | 345.8 (ascending) |
| eccentricity: | 0.77 |
| time of periastron passage: | 1973.89 |
| dates of ephemeris: | 1973-1987 |
| grade: | good |
| reference: | Astron. J. 80, 1065; 1975. |
| notes | The primary is a spectroscopic binary, P = 2.08 d. (Astrophys. J. 78, 225; 1933). |
| other name(s) | HO 212, 13 Cet |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 0h 32min 40.4sec | DEC: -3° 52' 4'' |
variability informations:
| variability type | RS | eruptive variable star |
| magnitute at max. brightness | 3.86 | |
| magnitute at min. brightness | 3.96 | |
| photometric system |
references
| to a study | Wang Gang, Hu Jingyao, Qian Zhongyu, Zhou Xu, AAp Sinica 7, No.4, 255, 1987. |
| to a chart/photograph | no chart is avaible, but the star is contained in the 'Bonner Durchmusterung' |
miscanellous
| ID in the GCVS catalogue | 21/98 |
| constellation | Cetus |
| notes on existence | The star is equivalent to '72002'. |
variability type description
| variability type | description |
| RS | Eruptive variables of the RS Canum Venaticorum type. This type is ascribed to close binary systems with spectra showing Ca II H and K in emission, their components having enhanced chromospheric activity that causes quasi-periodic light variability. The period of variation is close to the orbital one, and the variability amplitude is usually as great as 0.2 mag in V (UX Ari). They are X-ray sources and rotating variables. RS CVn itself is also an eclipsing system. |