Acamar
| catalogues and names | Acamar, q1Eri, NSV 01002, HR 897, HD 18622, SAO 216113, FK5: 106, WDS 02583-4018A |
| constellation | Eridanus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | ACAMAR. |
position, motion, parallax:
| position (J2000) | RA: 2h 58min 15,7sec | DEC: -40° 18' 17'' |
| position (J1900) | RA: 2h 54min 28,1sec | DEC: -40° 42' 19'' |
| proper motion (J2000) | RA: -0,045 arcsec/a | DEC: 0,019 arcsec/a |
| radial velocity | 12 km/s note: spectroscopic binaries, double lined spectra |
|
| rotational velocity | 74 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,035 arcsec | |
| note (category: dynamical parallaxes): | 0.016". |
magnitude
| visual magnitude | 3,24 (V on UBV Johnson system) |
spectral / color information
| spectral class | A4III |
| B-V-magnitude | 0,14 |
| U-B-magnitude | 0,14 |
| R-I-magnitude | 0,08 |
variability information
| variable star identification | 1002 |
double/multiple star system information
| separation | 8,3 arcsec |
| mag difference (of double or brightest multiple) | 1,1 |
| note | Worley (1978) update of the IDS |
| note (category: double and multiple data): | Binary with HR 898. Uncertain which component var. Combined mag. HR 897/8, 2.91V; combined colors, +0.125(B-V), +0.13(U-B). |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 2h 58min 15,696sec | DEC: -40° 18' 16,97'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: -0,0039 arcsec/a | DEC: 0,019 arcsec/a | source: 25 | |
| radial velocity | 12 km/s | source: 25 | ||
| trigonometric parallax | 0,035 | ±0,003 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 247,85° | latitude: -60,74° | ||
| GCI unit vector (J2000) | X: 0,543325 | Y: 0,535145 | Z: -0,646853 | |
magnitude:
| visual | 3,24 (observed) | source: 25 |
| photovisual | 3,4 | source: 2 |
| photographic | 3,5 | source: 2 |
spectral information:
| spectral class | A2 | source: 29 | |
| Morgan-Keenan | A5IV | source: 25 | |
| B-magnitude | 3,38 ±0,05 | B-V-magnitude | 0,14 |
| U-magnitude | 3,52 ±0,05 | U-B-magnitude | 0,14 |
double/multiple star system information:
| separation between brightest and second brightest component | 8,3 arcsec |
| magnitude difference between brightest and second brightest component | 1,1 |
| position angle | 91 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 3,24 | A2 | Acamar, q1Eridani, HR 897, HD 18622, SAO 216113 |
| B | 4,35 | A2 | q2Eridani, HR 898, HD 18623, SAO 216114 |
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 | |
| 29 | SAOJ2000 |
| SAO on FK5 at J2000, 1989 | |
data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)
position and proper motion:
| position (J1950) | RA: 2h 56min 21,882sec | DEC: -40° 30' 15,15'' | ±0,01 arcsec |
| position (J2000) | RA: 2h 58min 15,691sec | DEC: -40° 18' 16,98'' | |
| proper motion J1950 (FK4) | RA: -0,0045 arcsec/a | DEC: 0,023 arcsec/a | ±0,002 arcsec/a in RA ±0,002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0039 arcsec/a | DEC: 0,019 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3,4 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | A2 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 106 |
| Durchmusterung | CD-40 771A |
| Boss General Catalogue | 3584 |
| Henry Draper Catalogue | 18622 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 2h 58,3min | DEC: -40° 18' |
| proper motion (J2000) | RA: -0,045 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 |
| - | 1835 | 54 | 82° | 8,3'' | 3,4 | 4,5 | A4III A1V | PZ 2 |
| 1990 | 91° | - |
discoverer information:
| discoverer code | discoverer | reference |
| PZ 2 | Piazzi, G. | - |
notes:
| note | Theta Eri. A is a spectroscopic binary. Proper motion of B -017 -006. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (J1950) | RA: 2h 56min 22,6sec | DEC: -40° 30' 14'' |
variability informations:
| variability type | - |
| magnitute at max. brightness | 2,91 |
| magnitute at min. brightness | |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | A3 |
references
| to a study | 0807D (designation: 48,49GERI) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |