y1Piscium
catalogues and names
| catalogues and names | y1Psc, 74 Psc, HR 311, HD 6457, SAO 74483, BD +20 157, WDS 01057+2128B |
| constellation | Pisces |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 1h 5min 41,7sec | DEC: +21° 27' 55'' | ||
| position (2001,17) | RA: 1h 5min 46sec | DEC: +21° 28' 18'' | ||
| position (B1900) | RA: 1h 0min 19,9sec | DEC: +20° 55' 48'' | ||
| proper motion (J2000) | RA: 0,047 arcsec/a | DEC: -0,018 arcsec/a | ||
| radial velocity | -4 km/s note: variable radial velocity |
|||
| rotational velocity | 267 km/s (uncertain) (variable) | |||
| dynamical parallax | 0,016 arcsec | |||
| galactic coordinates | longitude: 127,35° | latitude: -41,28° | ||
magnitude
| visual magnitude | 5,56 (V on UBV Johnson system) |
spectral / color information
| spectral class | A0Vn |
| B-V-magnitude | -0,07 |
| U-B-magnitude | -0,16 |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 29,9 arcsec |
| mag difference (of double or brightest multiple) | 0,3 |
| component ID | AB |
| note (category: double and multiple data): | CPM with HR 310. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 1h 5min 41,739sec | DEC: +21° 27' 55,53'' | ±0,35 arcsec | source: 17 |
| position (2001,17) | RA: 1h 5min 46sec | DEC: +21° 28' 19'' | JD: 2451974,22 | |
| proper motion (J2000) | RA: 0,0042 arcsec/a | DEC: -0,017 arcsec/a | source: 25 | |
| radial velocity | -4 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 127,36° | latitude: -41,28° | ||
magnitude:
| visual | 5,56 (observed) | source: 25 |
| photovisual | 5,8 | source: 2 |
| photographic | 5,8 | source: 16 |
spectral information:
| spectral class | A0 | source: 96 | |
| Morgan-Keenan | A0Vn | source: 25 | |
| B-magnitude | 5,49 ±0,05 | B-V-magnitude | -0,07 |
| U-magnitude | 5,33 ±0,05 | U-B-magnitude | -0,16 |
double/multiple star system information:
| separation between brightest and second brightest component | 73,4 arcsec |
| magnitude difference between brightest and second brightest component | 5,8 |
| position angle | 108 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 5,34 | A2 | y1Piscium, 74 Psc, HR 310, HD 6456, SAO 74482 |
| B | 5,56 | A0 | y1Piscium, 74 Psc, HR 311, HD 6457, SAO 74483 |
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 | |
| 17 | ACRS |
| Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 1991 | |
| 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: 1h 3min 0,52sec | DEC: +21° 11' 53,41'' | ±0,03 arcsec |
| position (2001,17) | RA: 1h 5min 46sec | DEC: +21° 28' 18'' | JD: 2451974,22 |
| position (J2000) | RA: 1h 5min 41,676sec | DEC: +21° 27' 55,41'' | |
| proper motion B1950 (FK4) | RA: 0,0034 arcsec/a | DEC: -0,013 arcsec/a | ±0,006 arcsec/a in RA ±0,004 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0034 arcsec/a | DEC: -0,018 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5,8 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | A0 |
| 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: 1310 |
| Durchmusterung | BD+20 157 |
| Boss General Catalogue | 1310 |
| Henry Draper Catalogue | 6457 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 1h 5,7min | DEC: +21° 28' |
| proper motion (J2000) | RA: 0,055 arcsec/a | DEC: -0,019 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 | 69 | 159° | 30'' | 5,34 | 5,56 | B9.5V A0V | STF 88 |
| AC | 1907 | 4 | 122° | 94,2'' | 5,6 | 11,2 | A2 | STF 88 |
| 1988 | 123° | 91,3'' | ||||||
| BC | 1881 | 3 | 108° | 74,8'' | 5,8 | 11,6 | A0 | STF 88 |
| 1914 | - | 73,4'' |
discoverer information:
| discoverer code | discoverer | reference |
| STF 88 | Struve, F.G.W. | - |
notes:
| note | Psi (1) Psc. Proper motion of B +059 -017. |