i Capricorni
catalogues and names
| catalogues and names | i Cap, iot Cap, 32 Cap, HR 8167, HD 203387, SAO 164346, BD -17 6245, FK5: 1561 |
| constellation | Capricornus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 21h 22min 14.8sec | DEC: -16° 50' 4'' | ||
| position (B1900) | RA: 21h 16min 40.7sec | DEC: -17° 15' 38'' | ||
| proper motion (J2000) | RA: 0.033 arcsec/a | DEC: 0.004 arcsec/a | ||
| radial velocity | 12 km/s note: suspected variable radial velocity |
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| rotational velocity | <17 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.033 arcsec | |||
| galactic coordinates | longitude: 33.62° | latitude: -40.77° | ||
magnitude
| visual magnitude | 4.28 (V on UBV Johnson system) |
spectral / color information
| spectral class | G7IIIFe-1.5 |
| B-V-magnitude | 0.9 |
| U-B-magnitude | 0.58 |
| R-I-magnitude | |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 21h 22min 14.803sec | DEC: -16° 50' 4.48'' | ±0.06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0.0023 arcsec/a | DEC: 0.004 arcsec/a | source: 25 | |
| radial velocity | 12 km/s | source: 25 | ||
| trigonometric parallax | 0.033 arcsec | ±0.003 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 33.63° | latitude: -40.77° | ||
magnitude:
| visual | 4.28 (observed) | source: 25 |
| photovisual | 4.3 | source: 2 |
| photographic | 5.3 | source: 2 |
spectral information:
| spectral class | K0 | source: 96 | |
| Morgan-Keenan | G7IIIFe-1.5 | source: 25 | |
| B-magnitude | 5.18 ±0.05 | B-V-magnitude | 0.9 |
| U-magnitude | 5.76 ±0.05 | U-B-magnitude | 0.58 |
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 | |
| 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: 21h 19min 27.888sec | DEC: -17° 2' 55'' | ±0.005 arcsec |
| position (J2000) | RA: 21h 22min 14.812sec | DEC: -16° 50' 4.56'' | |
| proper motion B1950 (FK4) | RA: 0.0022 arcsec/a | DEC: 0.006 arcsec/a | ±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0023 arcsec/a | DEC: 0.004 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.3 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | K0 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 1561 |
| Durchmusterung | BD-17 6245 |
| Boss General Catalogue | 29903 |
| Henry Draper Catalogue | 203387 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 21h 19min 27.9sec | DEC: -17° 2' 55'' |
variability informations:
| variability type | BY | rotating variable star |
| magnitute at max. brightness | 4.27 | |
| magnitute amplitude | 0.06 | |
| photometric system | visual, photovisual or Johnson's V |
references
| to a study | G.W.Henry, F.C.Fekel, D.S.Hall, AJ 110, No.6, 2926, 1995. |
| to a chart/photograph |
miscanellous
| ID in the GCVS catalogue | 16/9009 |
| constellation | Capricornus |
| notes on existence | The star is equivalent to '73675'. |
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. |