NSV 20178
| catalogues and names | NSV 20178, 54 Hya, HR 5497, HD 129926, SAO 182855, WDS 14460-2527 |
| constellation | Hydra |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 14h 46min 0,1sec | DEC: -25° 26' 35'' |
| position (J1900) | RA: 14h 40min 12,6sec | DEC: -25° 1' 7'' |
| proper motion (J2000) | RA: -0,15 arcsec/a | DEC: -0,104 arcsec/a |
| radial velocity | -13 km/s | |
| rotational velocity | 161 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,049 arcsec | |
| note (category: radial and/or rotational velocities): | ADS 9375B, G3V, -20k/s. |
| note (category: dynamical parallaxes): | 0.023". |
magnitude
| visual magnitude | 4,94 (V on UBV Johnson system) |
spectral / color information
| spectral class | F2III-IV |
| B-V-magnitude | 0,35 |
| U-B-magnitude | 0,1 |
double/multiple star system information
| separation | 8,5 arcsec |
| mag difference (of double or brightest multiple) | 2 |
| note (category: double and multiple data): | Binary, components F0V, G1V. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 14h 46min 0,28sec | DEC: -25° 26' 37,04'' | ±0,19 arcsec | source: 16 |
| proper motion (J2000) | RA: -0,0086 arcsec/a | DEC: -0,121 arcsec/a | source: 25 | |
| radial velocity | -13 km/s | source: 25 | ||
| trigonometric parallax | 0,049 | ±0,005 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 333,14° | latitude: 30,63° | ||
| GCI unit vector (J2000) | X: -0,676301 | Y: -0,598365 | Z: -0,429623 | |
magnitude:
| visual | 4,94 (observed) | source: 25 |
| photovisual | 5 | source: 2 |
| photographic | 5,5 | source: 2 |
spectral information:
| spectral class | F5 | source: 96 | |
| Morgan-Keenan | F2III-IV | source: 25 | |
| B-magnitude | 5,29 ±0,05 | B-V-magnitude | 0,35 |
| U-magnitude | 5,39 ±0,05 | U-B-magnitude | 0,1 |
double/multiple star system information:
| separation between brightest and second brightest component | 8,3 arcsec |
| magnitude difference between brightest and second brightest component | 2 |
| position angle | 123 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 4,94 | F5 | 54 Hya, HR 5497, HD 129926, SAO 182855 |
| B | - | F9 |
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: 14h 43min 6,029sec | DEC: -25° 13' 55,15'' | ±0,021 arcsec |
| position (J2000) | RA: 14h 46min 0,057sec | DEC: -25° 26' 35,25'' | |
| proper motion J1950 (FK4) | RA: -0,0111 arcsec/a | DEC: -0,107 arcsec/a | ±0,004 arcsec/a in RA ±0,004 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0111 arcsec/a | DEC: -0,103 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5,2 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | F5 |
| 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: 19864 |
| Durchmusterung | CD-2411661A |
| Boss General Catalogue | 19864 |
| Henry Draper Catalogue | 129926 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 14h 46min | DEC: -25° 27' |
| proper motion (J2000) | RA: -0,144 arcsec/a | DEC: -0,11 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 |
| - | 1783 | 49 | 139° | 9,6'' | 5,1 | 7,1 | F2V | H 97 |
| 1991 | 123° | 8,3'' |
discoverer information:
| discoverer code | discoverer | reference |
| H 97 | Herschel, W. | - |
notes:
| note | H III 97. 54 Hya. Proper motion of B -116 -121. |