HR 181
| catalogues and names |
| The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) |
| SKY2000 - Master Star Catalog |
| Smithsonian Astrophysical Observatory Star Catalog |
catalogues and names
| catalogues and names | HR 181, HD 3924, SAO 21642, BD +57 132 |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 0h 42min 31.1sec | DEC: +58° 45' 12'' | ||
| position (B1900) | RA: 0h 36min 45.8sec | DEC: +58° 12' 19'' | ||
| proper motion (J2000) | RA: 0.036 arcsec/a | DEC: -0.007 arcsec/a | ||
| radial velocity | -3 km/s | |||
| rotational velocity | 100 km/s (uncertain) (variable) | |||
| galactic coordinates | longitude: 121.77° | latitude: -4.1° | ||
magnitude
| visual magnitude | 6.17 (V on UBV Johnson system) |
spectral / color information
| spectral class | B9.5III |
| B-V-magnitude | -0.01 |
| U-B-magnitude | -0.11 |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 0h 42min 31.094sec | DEC: +58° 45' 12.47'' | ±0.43 arcsec | source: 16 |
| proper motion (J2000) | RA: 0.0045 arcsec/a | DEC: -0.005 arcsec/a | source: 25 | |
| radial velocity | -3 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 121.78° | latitude: -4.1° | ||
magnitude:
| visual | 6.17 (observed) | source: 25 |
| photovisual | 6.1 | source: 2 |
| photographic | 6.1 | source: 16 |
spectral information:
| spectral class | B9 | source: 96 | |
| Morgan-Keenan | B9.5III | source: 25 | |
| B-magnitude | 6.16 ±0.05 | B-V-magnitude | -0.01 |
| U-magnitude | 6.05 ±0.05 | U-B-magnitude | -0.11 |
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 | |
| 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: 0h 39min 37.606sec | DEC: +58° 28' 46.91'' | ±0.026 arcsec |
| position (J2000) | RA: 0h 42min 31.121sec | DEC: +58° 45' 12.48'' | |
| proper motion B1950 (FK4) | RA: 0.0045 arcsec/a | DEC: -0.001 arcsec/a | ±0.004 arcsec/a in RA ±0.004 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0046 arcsec/a | DEC: -0.007 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 6.1 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | B9 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 837 |
| Durchmusterung | BD+57 132 |
| Boss General Catalogue | 837 |
| Henry Draper Catalogue | 3924 |