1 Peg
| catalogues and names | 1 Peg, HR 8173, HD 203504, SAO 107073, FK5: 804, WDS 21221+1948A |
| constellation | Pegasus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 21h 22min 5,2sec | DEC: +19° 48' 16'' |
| position (J1900) | RA: 21h 17min 27,6sec | DEC: +19° 22' 36'' |
| proper motion (J2000) | RA: 0,106 arcsec/a | DEC: 0,064 arcsec/a |
| radial velocity | -76 km/s note: spectroscopic binaries |
|
| rotational velocity | <17 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,014 arcsec | |
magnitude
| visual magnitude | 4,08 (V on UBV Johnson system) |
spectral / color information
| spectral class | K1III |
| B-V-magnitude | 1,11 |
| U-B-magnitude | 1,06 |
| R-I-magnitude | 0,54 |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 36,2 arcsec |
| mag difference (of double or brightest multiple) | 4,9 |
| component ID | AB |
| note (category: double and multiple data): | AB CPM. Companion K0V. |
| note (category: spectroscopic binaries): | ADS 14909B. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 21h 22min 5,198sec | DEC: +19° 48' 16,26'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0,0075 arcsec/a | DEC: 0,064 arcsec/a | source: 25 | |
| radial velocity | -76 km/s | source: 25 | ||
| trigonometric parallax | 0,014 | ±0,001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 70,06° | latitude: -20,92° | ||
| GCI unit vector (J2000) | X: 0,726212 | Y: -0,598182 | Z: 0,338812 | |
magnitude:
| visual | 4,08 (observed) | source: 25 |
| photovisual | 4,2 | source: 2 |
spectral information:
| spectral class | K0 | source: 96 | |
| Morgan-Keenan | K1III | source: 25 | |
| B-magnitude | 5,19 ±0,05 | B-V-magnitude | 1,11 |
| U-magnitude | 6,25 ±0,05 | U-B-magnitude | 1,06 |
double/multiple star system information:
| separation between brightest and second brightest component | 36,3 arcsec |
| magnitude difference between brightest and second brightest component | 5,08 |
| position angle | 311 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 4,08 | K0 | 1 Peg, HR 8173, HD 203504, SAO 107073 |
| B | 9,15 | - |
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 | |
| 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 (J1950) | RA: 21h 19min 46,347sec | DEC: +19° 35' 22,77'' | ±0,004 arcsec |
| position (J2000) | RA: 21h 22min 5,194sec | DEC: +19° 48' 16,24'' | |
| proper motion J1950 (FK4) | RA: 0,0074 arcsec/a | DEC: 0,066 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0074 arcsec/a | DEC: 0,063 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: 804 |
| Durchmusterung | BD+19 4691 |
| Boss General Catalogue | 29914 |
| Henry Draper Catalogue | 203504 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 21h 22,1min | DEC: +19° 48' |
| proper motion (J2000) | RA: 0,106 arcsec/a | DEC: 0,064 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 | 1835 | 29 | 311° | 36,3'' | 4,08 | 9,16 | K0.5III | STF 11 |
| AC | 1912 | 2 | 20° | 75'' | 4,2 | 12,1 | - | STF 11 |
discoverer information:
| discoverer code | discoverer | reference |
| STF 11 | Struve, F.G.W. | - |
notes:
| note | 1 Peg. B is a spectroscopic binary, P = 1111d, and is BD+19@4690. Spectrum K0V. Proper motion of B +110 +050. |