51 Eridani
catalogues and names
| catalogues and names | 51 Eri, HR 1474, HD 29391, SAO 131358, BD -2 963, WDS 04376-0228 |
| constellation | Eridanus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 4h 37min 36.1sec | DEC: -2° 28' 24'' | ||
| position (B1900) | RA: 4h 32min 34.1sec | DEC: -2° 40' 24'' | ||
| proper motion (J2000) | RA: 0.042 arcsec/a | DEC: -0.061 arcsec/a | ||
| radial velocity | 21 km/s | |||
| rotational velocity | 95 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.034 arcsec | |||
| galactic coordinates | longitude: 198.61° | latitude: -30.66° | ||
magnitude
| visual magnitude | 5.23 (V on UBV Johnson system) |
spectral / color information
| spectral class | F0V |
| B-V-magnitude | 0.28 |
| U-B-magnitude | 0.04 |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 80 arcsec |
| mag difference (of double or brightest multiple) | 5.9 |
| component ID | AC |
| note (category: double and multiple data): | IDS gives AB, 5.3, 11.8v sep. 30". Optical. Component C by Wallenquist. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 4h 37min 36.123sec | DEC: -2° 28' 25.14'' | ±0.35 arcsec | source: 17 |
| proper motion (J2000) | RA: 0.0028 arcsec/a | DEC: -0.07 arcsec/a | source: 25 | |
| radial velocity | 21 km/s | source: 25 | ||
| trigonometric parallax | 0.034 arcsec | ±0.003 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 198.61° | latitude: -30.66° | ||
magnitude:
| visual | 5.23 (observed) | source: 25 |
| photovisual | 5.5 | source: 16 |
| photographic | 5.5 | source: 2 |
spectral information:
| spectral class | A5 | source: 96 | |
| Morgan-Keenan | F0V | source: 25 | |
| B-magnitude | 5.51 ±0.05 | B-V-magnitude | 0.28 |
| U-magnitude | 5.55 ±0.05 | U-B-magnitude | 0.04 |
double/multiple star system information:
| separation between brightest and second brightest component | 29.9 arcsec |
| magnitude difference between brightest and second brightest component | 6.6 |
| position angle | 79 ° |
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: 4h 35min 4.971sec | DEC: -2° 34' 19.2'' | ±0.017 arcsec |
| position (J2000) | RA: 4h 37min 36.107sec | DEC: -2° 28' 24.43'' | |
| proper motion B1950 (FK4) | RA: 0.0025 arcsec/a | DEC: -0.059 arcsec/a | ±0.004 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0028 arcsec/a | DEC: -0.061 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5.3 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | A5 |
| 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: 5635 |
| Durchmusterung | BD-02 963 |
| Boss General Catalogue | 5635 |
| Henry Draper Catalogue | 29391 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 4h 37.6min | DEC: -2° 28' |
| proper motion (J2000) | RA: 0.042 arcsec/a | DEC: -0.07 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 |
| - | 1891 | 7 | 90° | 32.4'' | 5.23 | 11.8 | F0V | BU 88 |
| 1963 | 79° | 29.9'' |
discoverer information:
| discoverer code | discoverer | reference |
| BU 88 | Burnham, S.W. | - |