HR 250
catalogues and names
| catalogues and names | HR 250, HD 5128, SAO 21814, BD +51 179, WDS 00538+5242A |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 0h 53min 47.6sec | DEC: +52° 41' 21'' | ||
| position (B1900) | RA: 0h 48min 1.1sec | DEC: +52° 8' 49'' | ||
| proper motion (J2000) | RA: 0.076 arcsec/a | DEC: -0.026 arcsec/a | ||
| radial velocity | -1 km/s | |||
| rotational velocity | 30 km/s (uncertain) (variable) | |||
| dynamical parallax | 0.013 arcsec | |||
| galactic coordinates | longitude: 123.29° | latitude: -10.18° | ||
magnitude
| visual magnitude | 6.27 (V on UBV Johnson system) |
spectral / color information
| spectral class | A5m |
| B-V-magnitude | 0.19 |
| U-B-magnitude | 0.15 |
| 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 | 4 |
| separation | 8.2 arcsec |
| mag difference (of double or brightest multiple) | 3.4 |
| component ID | AB |
| note (category: double and multiple data): | AB CPM. Component B, dG4. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 0h 53min 47.594sec | DEC: +52° 41' 21.19'' | ±1.24 arcsec | source: 29 |
| proper motion (J2000) | RA: 0.0084 arcsec/a | DEC: -0.026 arcsec/a | source: 25 | |
| radial velocity | -1 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 123.3° | latitude: -10.18° | ||
magnitude:
| visual | 6.27 (observed) | source: 25 |
| photovisual | 6.2 | source: 2 |
| photographic | 6.2 | source: 2 |
spectral information:
| spectral class | A0 | source: 96 | |
| Morgan-Keenan | A5m | source: 25 | |
| B-magnitude | 6.46 ±0.05 | B-V-magnitude | 0.19 |
| U-magnitude | 6.61 ±0.05 | U-B-magnitude | 0.15 |
double/multiple star system information:
| separation between brightest and second brightest component | 8.2 arcsec |
| magnitude difference between brightest and second brightest component | 3 |
| position angle | 246 ° |
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 | |
| 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 | |
| 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: 0h 50min 53.666sec | DEC: +52° 25' 6.52'' | ±0.026 arcsec |
| position (J2000) | RA: 0h 53min 47.594sec | DEC: +52° 41' 21.19'' | |
| proper motion B1950 (FK4) | RA: 0.0082 arcsec/a | DEC: -0.021 arcsec/a | ±0.005 arcsec/a in RA ±0.004 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0084 arcsec/a | DEC: -0.026 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 6.2 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | A0 |
| 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: 1068 |
| Durchmusterung | BD+51 179 |
| Boss General Catalogue | 1068 |
| Henry Draper Catalogue | 5128 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 0h 53.8min | DEC: +52° 42' |
| proper motion (J2000) | RA: 0.073 arcsec/a | DEC: -0.023 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 | 1832 | 17 | 244° | 8'' | 6.3 | 9.3 | A0 | STF 70 |
| 1964 | 246° | 8.2'' | ||||||
| AC | 1909 | 2 | 148° | 69.7'' | 6.2 | 9.8 | - | STF 70 |
| 1913 | - | 78.5'' | ||||||
| CD | 1909 | 3 | 90° | 1.8'' | 9.8 | 10.2 | - | STF 70 |
discoverer information:
| discoverer code | discoverer | reference |
| STF 70 | Struve, F.G.W. | - |