Alamak
catalogues and names
| catalogues and names | Alamak, g1And, 57 And, HR 603, HD 12533, SAO 37734, BD +41 395 A, FK5: 73, WDS 02039+4220A |
| other names | Almaak, Almach, Almak, Almaach |
| constellation | Andromeda |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | ALMAAK; Almach; Alamak; Almak; Almaach. |
position, motion, parallax:
| position (J2000) | RA: 2h 3min 54sec | DEC: +42° 19' 47'' | ||
| position (2001,18) | RA: 2h 3min 58sec | DEC: +42° 20' 7'' | ||
| position (B1900) | RA: 1h 57min 45,4sec | DEC: +41° 51' 0'' | ||
| proper motion (J2000) | RA: 0,045 arcsec/a | DEC: -0,052 arcsec/a | ||
| radial velocity | -12 km/s note: spectroscopic binaries |
|||
| rotational velocity | <17 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0,013 arcsec | |||
| galactic coordinates | longitude: 136,96° | latitude: -18,56° | ||
magnitude
| visual magnitude | 2,26 (V on UBV Johnson system) |
spectral / color information
| spectral class | K3-IIb |
| B-V-magnitude | 1,37 |
| U-B-magnitude | 1,58 |
| R-I-magnitude | |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
double/multiple star system information
| number of components of multiple star system | 4 |
| separation | 9,6 arcsec |
| mag difference (of double or brightest multiple) | 2,8 |
| component ID | AxBC |
| note (category: double and multiple data): | CPM with HR 604. |
miscellaneous information
| note (category: group membership): | Red star Pleiades group. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 2h 3min 53,963sec | DEC: +42° 19' 46,99'' | ±0,06 arcsec | source: 15 |
| position (2001,18) | RA: 2h 3min 58sec | DEC: +42° 20' 7'' | JD: 2451974,80 | |
| proper motion (J2000) | RA: 0,004 arcsec/a | DEC: -0,052 arcsec/a | source: 25 | |
| radial velocity | -12 km/s | source: 25 | ||
| trigonometric parallax | 0,013 arcsec | ±0,001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 136,97° | latitude: -18,56° | ||
magnitude:
| visual | 2,26 (observed) | source: 25 |
| photovisual | 2,3 | source: 2 |
spectral information:
| spectral class | K0 | source: 96 | |
| Morgan-Keenan | K3-IIb | source: 25 | |
| B-magnitude | 3,63 ±0,05 | B-V-magnitude | 1,37 |
| U-magnitude | 5,21 ±0,05 | U-B-magnitude | 1,58 |
double/multiple star system information:
| separation between brightest and second brightest component | 9,6 arcsec |
| magnitude difference between brightest and second brightest component | 2,58 |
| position angle | 63 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 2,26 | K0 | Alamak, g1Andromedae, 57 And, HR 603, HD 12533, SAO 37734 |
| B | 4,84 | A0 | g2Andromedae, 57 And, HR 604, HD 12534, SAO 37735 |
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 (B1950) | RA: 2h 0min 49,177sec | DEC: +42° 5' 27,01'' | ±0,003 arcsec |
| position (2001,18) | RA: 2h 3min 58sec | DEC: +42° 20' 10'' | JD: 2451974,80 |
| position (J2000) | RA: 2h 3min 53,977sec | DEC: +42° 19' 46,96'' | |
| proper motion B1950 (FK4) | RA: 0,0041 arcsec/a | DEC: -0,048 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0042 arcsec/a | DEC: -0,052 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 2,3 (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: 73 |
| Durchmusterung | BD+41 395A |
| Boss General Catalogue | 2477 |
| Henry Draper Catalogue | 12533 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 2h 3,9min | DEC: +42° 20' |
| proper motion (J2000) | RA: 0,045 arcsec/a | DEC: -0,052 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 |
| A-BC | 1830 | often | 63° | 10,3'' | 2,26 | 4,84 | K3IIb | STF 205 |
| 1987 | - | 9,6'' | ||||||
| AD | 1898 | 1 | 245° | 27,9'' | - | 15 | K3IIb | BAR 22 |
| BC | 1842 | often | ° | '' | 5,1 | 6,3 | B8V+A0V | STT 38 |
discoverer information:
| discoverer code | discoverer | reference |
| STF 205 | Struve, F.G.W. | - |
| BAR 22 | Barnard, E.E. | - |
| STT 38 | Struve, O. | - |
notes:
| note | H III 5, SHJ 26. Gamma And. BC: P = 61yr., a = -.30", motion retrograde. B is a spectroscopic binary. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
| position (B1900) | RA: 1h 57,8min | DEC: +41° 51' |
magnitudes, spectral classes, orbital elements:
| author: | P. Muller |
| date of observation: | 1955 |
| magnitude of component A: | 5,3 |
| magnitude of component B: | 5,3 |
| spectral class component B: | B8V |
| spectral class component B: | B8V |
| period [y]: | 61,1 |
| semi-major axis [arcsec]: | 0,296 |
| inclination [deg]: | 111,1 |
| node [deg]: | 104,15 |
| equinox of node: | 1950 |
| eccentricity: | 0,93 |
| time of periastron passage: | 1952,1 |
| dates of ephemeris: | 1950-1970 |
| grade: | good |
| reference: | J. Observateurs 40, 52; 1957. |
| notes | A quadruple system. Star A (mag. 2.3, K3II) forms with BC the pair STF 205, separation 10". Star B is a spectroscopic binary, P = 2.67 d (Maestre and Wright, Astrophys. J. 131, 119; 1960). |