a Piscium
| catalogues and names | a Psc, alf Psc, 113 Psc, HR 595, HD 12446, SAO 110291, WDS 02020+0246B |
| constellation | Pisces |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 2h 2min 2,8sec | DEC: +2° 45' 49'' |
| position (J1900) | RA: 1h 56min 52,3sec | DEC: +2° 16' 51'' |
| proper motion (J2000) | RA: 0,033 arcsec/a | DEC: -0,005 arcsec/a |
| radial velocity | 9 km/s note: spectroscopic binaries |
|
| rotational velocity | 24 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,005 arcsec | |
| note (category: dynamical parallaxes): | 0.017". |
magnitude
| visual magnitude | 5,23 (original HR magnitude) |
spectral / color information
| spectral class | A3m |
variability information
| note (category: variability): | Alpha CV? |
double/multiple star system information
| separation | 2 arcsec |
| mag difference (of double or brightest multiple) | 1 |
| note (category: double and multiple data): | Binary with HR 596, q.v. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 2h 2min 2,83sec | DEC: +2° 45' 49,3'' | ±0,76 arcsec | source: 18 |
| proper motion (J2000) | RA: 0,0023 arcsec/a | DEC: 0,002 arcsec/a | source: 25 | |
| radial velocity | 9 km/s | source: 25 | ||
| trigonometric parallax | 0,005 | - | source: 25 | |
| galactic coord. (B1950) | longitude: 155,36° | latitude: -55,6° | ||
| GCI unit vector (J2000) | X: 0,860523 | Y: 0,507125 | Z: 0,048217 | |
magnitude:
| visual | 5,21 (observed) | source: 25 |
| photovisual | 5,2 | source: 2 |
| photographic | 4 | source: 16 |
spectral information:
| spectral class | Ap | source: 28 | |
| Morgan-Keenan | A3m | source: 25 | |
| B-magnitude | 5,23 ±0,01 | B-V-magnitude | 0,018 |
| U-magnitude | 5,14 ±0,012 | U-B-magnitude | -0,88 |
double/multiple star system information:
| separation between brightest and second brightest component | 1,9 arcsec |
| magnitude difference between brightest and second brightest component | 0,9 |
| position angle | 278 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 4,18 | A2 | Alrisha, a Piscium, 113 Psc, HR 596, HD 12447, SAO 110291 |
| B | 5,21 | Ap | a Piscium, 113 Psc, HR 595, HD 12446, SAO 110291 |
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 | |
| 18 | Hipparcos Input Catalog Version 2 Annex |
| Turon, C., et al., "The Hipparcos Input Catalog, Version 2," Centre de Donnees Stellaires Information Bulletin, Vol. 43, p. 5, 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 | |
data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)
position and proper motion:
| position (J1950) | RA: 1h 59min 27,392sec | DEC: +2° 31' 23,04'' | ±0,011 arcsec |
| position (J2000) | RA: 2h 2min 2,81sec | DEC: +2° 45' 49,12'' | |
| proper motion J1950 (FK4) | RA: 0,002 arcsec/a | DEC: 0 arcsec/a | ±0,002 arcsec/a in RA ±0,002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0022 arcsec/a | DEC: -0,005 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 Harvard or San Luis photometry. |
spectral information:
| spectral class | A2p |
| 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: 2452 |
| Durchmusterung | BD+02 317 |
| Boss General Catalogue | 2452 |
| Henry Draper Catalogue | 12446 The "SAO Catalog" entry refers to two consecutive HD numbers, the lower of which is given. |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 2h 2min | DEC: +2° 46' |
| proper motion (J2000) | RA: 0,033 arcsec/a | DEC: 0,001 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 | 1821 | often | 337° | 3,5'' | 4,3 | 5,2 | A0p A3m | STF 202 |
| 1991 | 278° | 1,9'' | ||||||
| AC | 1856 | 1 | 62° | 406,1'' | - | - | - | PWL 1 |
| AD | 1856 | 1 | 336° | 457,8'' | - | - | - | PWL 1 |
discoverer information:
| discoverer code | discoverer | reference |
| STF 202 | Struve, F.G.W. | - |
| PWL 1 | Powell, E.B. | - |
notes:
| note | Alpha Psc. Both components are variables of the Alpha CVn type. Proper motion of B +033 -030. A premature orbit has been computed. A may be a spectroscopic pair. |