HR 4893
catalogues and names
| catalogues and names | HR 4893, HD 112028, SAO 2102, BD +84 290, WDS 12492+8325A |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | See HR 4892. |
position, motion, parallax:
| position (J2000) | RA: 12h 49min 13.6sec | DEC: +83° 24' 46'' | ||
| position (B1900) | RA: 12h 48min 23.1sec | DEC: +83° 57' 24'' | ||
| proper motion (J2000) | RA: -0.029 arcsec/a | DEC: 0.02 arcsec/a | ||
| radial velocity | 2 km/s note: variable radial velocity |
|||
| rotational velocity | 275 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.001 arcsec | |||
| galactic coordinates | longitude: 123.01° | latitude: 33.72° | ||
magnitude
| visual magnitude | 5.28 (V on UBV Johnson system) |
spectral / color information
| spectral class | A1IIIShell |
| B-V-magnitude | -0.03 |
| U-B-magnitude | -0.06 |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 21.6 arcsec |
| mag difference (of double or brightest multiple) | 0.5 |
| component ID | AB |
| note (category: double and multiple data): | CPM with HR 4892. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 12h 49min 13.412sec | DEC: +83° 24' 46.35'' | ±0.35 arcsec | source: 17 |
| proper motion (J2000) | RA: -0.0186 arcsec/a | DEC: 0.02 arcsec/a | source: 25 | |
| radial velocity | 2 km/s | source: 25 | ||
| trigonometric parallax | 0.001 arcsec | - | source: 25 | |
| galactic coord. (B1950) | longitude: 123.01° | latitude: 33.72° | ||
magnitude:
| visual | 5.31 (observed) | source: 25 |
| photovisual | 5.3 | source: 2 |
| photographic | 5.3 | source: 16 |
spectral information:
| spectral class | A2 | source: 96 | |
| Morgan-Keenan | A1III(shell) | source: 25 | |
| B-magnitude | 5.31 ±0.5 | B-V-magnitude | 0 |
| U-magnitude | 5.28 ±0.5 | U-B-magnitude | -0.03 |
double/multiple star system information:
| separation between brightest and second brightest component | 21.5 arcsec |
| magnitude difference between brightest and second brightest component | 0.57 |
| position angle | 326 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 5.31 | A2 | HR 4893, HD 112028, SAO 2102 |
| B | 5.84 | A0 | HR 4892, HD 112014, SAO 2101 |
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: 12h 48min 46.034sec | DEC: +83° 41' 4.45'' | ±0.008 arcsec |
| position (J2000) | RA: 12h 49min 13.556sec | DEC: +83° 24' 46.37'' | |
| proper motion B1950 (FK4) | RA: -0.0182 arcsec/a | DEC: 0.015 arcsec/a | ±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0172 arcsec/a | DEC: 0.02 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 | A2 |
| 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: 17443 |
| Durchmusterung | BD+84 290 |
| Boss General Catalogue | 17443 |
| Henry Draper Catalogue | 112028 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 12h 49.2min | DEC: +83° 25' |
| proper motion (J2000) | RA: -0.032 arcsec/a | DEC: 0.02 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 |
| - | 1820 | 29 | 326° | 22'' | 5.28 | 5.85 | A1IIIsh | STF1694 |
| 1978 | - | 21.5'' |
discoverer information:
| discoverer code | discoverer | reference |
| STF1694 | Struve, F.G.W. | - |
notes:
| note | B is +84@289 and is a spectroscopic binary, spectrum A0V+A2V, proper motion -023 +019. |