q2Eridani
| catalogues and names | q2Eri, NSV 01002, HR 898, HD 18623, SAO 216114, WDS 02583-4018B |
| constellation | Eridanus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 2h 58min 16,3sec | DEC: -40° 18' 16'' |
| position (J1900) | RA: 2h 54min 28,9sec | DEC: -40° 42' 18'' |
| proper motion (J2000) | RA: -0,064 arcsec/a | DEC: 0,018 arcsec/a |
| radial velocity | 19 km/s | |
| rotational velocity | 100 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,035 arcsec | |
| note (category: dynamical parallaxes): | 0.016". |
magnitude
| visual magnitude | 4,35 (V on UBV Johnson system) |
spectral / color information
| spectral class | A1V |
| B-V-magnitude | 0,08 |
| U-B-magnitude | 0,12 |
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 897. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 2h 58min 16,408sec | DEC: -40° 18' 16,84'' | ±0,19 arcsec | source: 16 |
| proper motion (J2000) | RA: -0,0015 arcsec/a | DEC: -0,006 arcsec/a | source: 25 | |
| radial velocity | 19 km/s | source: 25 | ||
| trigonometric parallax | 0,035 | ±0,003 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 247,85° | latitude: -60,73° | ||
| GCI unit vector (J2000) | X: 0,543298 | Y: 0,535173 | Z: -0,646852 | |
magnitude:
| visual | 4,35 (observed) | source: 25 |
| photovisual | 4,4 | source: 2 |
| photographic | 4,5 | source: 2 |
spectral information:
| spectral class | A2 | source: 96 | |
| Morgan-Keenan | A1V | source: 25 | |
| B-magnitude | 4,43 ±0,05 | B-V-magnitude | 0,08 |
| U-magnitude | 4,55 ±0,05 | U-B-magnitude | 0,12 |
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 | |
| 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 | |
| 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: 2h 56min 22,578sec | DEC: -40° 30' 14,34'' | ±0,035 arcsec |
| position (J2000) | RA: 2h 58min 16,301sec | DEC: -40° 18' 16,25'' | |
| proper motion J1950 (FK4) | RA: -0,0062 arcsec/a | DEC: 0,022 arcsec/a | ±0,005 arcsec/a in RA ±0,007 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0056 arcsec/a | DEC: 0,018 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4,4 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | A2 |
| 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: 3586 |
| Durchmusterung | CD-40 771B |
| Boss General Catalogue | 3586 |
| Henry Draper Catalogue | 18623 |
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)). |