y2Aurigae
catalogues and names
| catalogues and names | y2Aur, 50 Aur, HR 2427, HD 47174, SAO 41239, BD +42 1585, WDS 06393+4229A |
| constellation | Auriga |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 6h 39min 19.9sec | DEC: +42° 29' 20'' | ||
| position (B1900) | RA: 6h 32min 11.4sec | DEC: +42° 34' 37'' | ||
| proper motion (J2000) | RA: 0.006 arcsec/a | DEC: -0.058 arcsec/a | ||
| radial velocity | 17 km/s note: variable radial velocity |
|||
| rotational velocity | <17 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.004 arcsec | |||
| galactic coordinates | longitude: 172.89° | latitude: 15.86° | ||
magnitude
| visual magnitude | 4.79 (V on UBV Johnson system) |
spectral / color information
| spectral class | K3III |
| B-V-magnitude | 1.23 |
| U-B-magnitude | 1.29 |
| 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 | 3 |
| separation | 52.1 arcsec |
| mag difference (of double or brightest multiple) | 5.5 |
| component ID | AB |
| note | Worley (1978) update of the IDS |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 6h 39min 19.805sec | DEC: +42° 29' 20.15'' | ±0.2 arcsec | source: 52 |
| proper motion (J2000) | RA: -0.0001 arcsec/a | DEC: -0.054 arcsec/a | source: 25 | |
| radial velocity | 17 km/s | source: 25 | ||
| trigonometric parallax | 0.004 arcsec | - | source: 25 | |
| galactic coord. (B1950) | longitude: 172.89° | latitude: 15.86° | ||
magnitude:
| visual | 4.79 (observed) | source: 25 |
| photovisual | 5.1 | source: 2 |
| photographic | 5.9 | source: 16 |
spectral information:
| spectral class | G5 | source: 96 | |
| Morgan-Keenan | K2-III | source: 25 | |
| B-magnitude | 6.02 ±0.05 | B-V-magnitude | 1.23 |
| U-magnitude | 7.31 ±0.05 | U-B-magnitude | 1.29 |
double/multiple star system information:
| separation between brightest and second brightest component | 52.1 arcsec |
| magnitude difference between brightest and second brightest component | 5.8 |
| position angle | 107 ° |
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 | |
| 52 | PPMN-HP subset |
| PPMN Star Catalogue (Reference 16) High-Precision Subset (Code H) | |
| 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: 6h 35min 45.703sec | DEC: +42° 32' 6.13'' | ±0.023 arcsec |
| position (J2000) | RA: 6h 39min 19.892sec | DEC: +42° 29' 19.8'' | |
| proper motion B1950 (FK4) | RA: 0.0006 arcsec/a | DEC: -0.059 arcsec/a | ±0.004 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0005 arcsec/a | DEC: -0.058 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5.1 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | G5 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 8662 |
| Durchmusterung | BD+42 1585 |
| Boss General Catalogue | 8662 |
| Henry Draper Catalogue | 47174 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 6h 39.3min | DEC: +42° 29' |
| proper motion (J2000) | RA: -0.005 arcsec/a | DEC: -0.058 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 |
| AB | 1894 | 3 | 110° | 53.2'' | 4.79 | 10.6 | K3III | BUP 92 |
| 1963 | 107° | 52.1'' | ||||||
| AC | 1907 | 3 | 75° | 99.5'' | 4.79 | 11.3 | - | BUP 92 |
| 1963 | 74° | - |
discoverer information:
| discoverer code | discoverer | reference |
| BUP 92 | - | - |
notes:
| note | Psi (3) Aur. |