p Aquarii
catalogues and names
| catalogues and names | p Aqr, pi Aqr, 52 Aqr, HR 8539, HD 212571, SAO 127520, BD +0 4872, FK5: 1585 |
| constellation | Aquarius |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 22h 25min 16.6sec | DEC: +1° 22' 39'' | ||
| position (B1900) | RA: 22h 20min 10.2sec | DEC: +0° 52' 12'' | ||
| proper motion (J2000) | RA: 0.019 arcsec/a | DEC: 0.001 arcsec/a | ||
| radial velocity | 4 km/s note: variable radial velocity |
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| rotational velocity | 278 km/s (uncertain) (variable) | |||
| galactic coordinates | longitude: 66.01° | latitude: -44.74° | ||
| note (category: radial and/or rotational velocities): | 2-6y. |
magnitude
| visual magnitude | 4.66 (V on UBV Johnson system) |
spectral / color information
| spectral class | B1Ve |
| B-V-magnitude | -0.03 |
| U-B-magnitude | -0.98 |
| R-I-magnitude | |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
| note (category: spectra): | Shell star. Also classified B1III-IVe. |
variability information
| variable star identification | Pi Aqr |
| note (category: variability): | Gamma Cas 4.42 - 4.70V. Variable magnitude, RV and emission lines due to slow rotation of line of apsides of rapidly rotating equatorial shell. Spectrum variable 0.087d. Variable polarization. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 22h 25min 16.627sec | DEC: +1° 22' 38.51'' | ±0.06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0.0013 arcsec/a | DEC: 0.001 arcsec/a | source: 25 | |
| radial velocity | 4 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 66.02° | latitude: -44.74° | ||
magnitude:
| visual | 4.4 (observed) | source: 31 |
| photovisual | 4.6 | source: 2 |
spectral information:
| spectral class | B1 | source: 96 | |
| Morgan-Keenan | B1Ve | source: 25 | |
| B-magnitude | 4.63 ±0.05 | B-V-magnitude | -0.03 |
| U-magnitude | 3.65 ±0.05 | U-B-magnitude | -0.98 |
variability information:
| variability type | 264 |
| var. amplitude | 0.28 |
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 | |
| 31 | CRM' (non-GCVS variable data) |
| Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 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: 22h 22min 43.382sec | DEC: +1° 7' 22.87'' | ±0.005 arcsec |
| position (J2000) | RA: 22h 25min 16.629sec | DEC: +1° 22' 38.46'' | |
| proper motion B1950 (FK4) | RA: 0.0012 arcsec/a | DEC: 0.005 arcsec/a | ±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0014 arcsec/a | DEC: 0 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.6 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | B1p |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 1585 |
| Durchmusterung | BD+00 4872 |
| Boss General Catalogue | 31328 |
| Henry Draper Catalogue | 212571 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 22h 22min 43.4sec | DEC: +1° 7' 23'' |
variability informations:
| variability type | GCAS | eruptive variable star |
| magnitute at max. brightness | 4.42 | |
| magnitute at min. brightness | 4.7 | |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | B1Ve |
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 | 4/9016 |
| constellation | Aquarius |
| notes on existence | The star is equivalent to '0049022 khi'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| GCAS | Eruptive irregular variables of the Gamma Cas type. These are rapidly rotating B III-IVe stars with mass outflow from their equatorial zones. The formation of equatorial rings or disks is often accompanied by temporary fading. Light amplitudes may reach 1.5 mag in V. |