b Monocerotis
| catalogues and names | b Mon, NSV 02977, 11 Mon, HR 2356, HD 45725, SAO 133316, WDS 06288-0702A |
| constellation | Monoceros |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 6h 28min 49sec | DEC: -7° 1' 58'' |
| position (J1900) | RA: 6h 23min 58sec | DEC: -6° 58' 8'' |
| proper motion (J2000) | RA: -0,017 arcsec/a | DEC: 0 arcsec/a |
| radial velocity | 20 km/s note: spectroscopic binaries note: orbital data avaible |
|
| rotational velocity | 346 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,021 arcsec | |
magnitude
| visual magnitude | 4,6 (V on UBV Johnson system) |
spectral / color information
| spectral class | B3Ve |
| B-V-magnitude | -0,1 |
| U-B-magnitude | -0,63 |
| R-I-magnitude | -0,16 |
| note (category: spectra): | Shell star with variable H alpha emission. |
variability information
| variable star identification | 2977 |
| note (category: variability): | Hydrogen lines var. K 30k/s. Shell line velocities do not correspond to orbital elements; may be due to gaseous ring. |
double/multiple star system information
| number of components of multiple star system | 4 |
| separation | 7,1 arcsec |
| mag difference (of double or brightest multiple) | 0,5 |
| component ID | AB |
| note (category: double and multiple data): | Triple system with HR 2357 and 2358. Combined mag., color 3.74V, -0.15(B-V), all Be stars. AB, 17000y; AC, sep. 10", 29000y. Component D, 12.2v at 26" from A. Uncertain which of components A,B,C, HR 2356,7,8 is the light variable NSV 2977, for which the mag. 3.75V is a blend of all three. |
| note (category: spectroscopic binaries): | 12.5y, K 30k/s, asini 1900. Shell oscillations. Spectrum var. 12.5y for 3.5 cycles, then ceased. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 6h 28min 48,96sec | DEC: -7° 1' 58,2'' | ±0,76 arcsec | source: 18 |
| proper motion (J2000) | RA: -0,0015 arcsec/a | DEC: 0,002 arcsec/a | source: 25 | |
| radial velocity | 20 km/s | source: 25 | ||
| trigonometric parallax | 0,021 | ±0,002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 216,67° | latitude: -8,21° | ||
| GCI unit vector (J2000) | X: -0,124459 | Y: 0,984641 | Z: -0,122438 | |
magnitude:
| visual | 4,6 (observed) | source: 25 |
| photovisual | 4,7 | source: 2 |
| photographic | 4,5 | source: 2 |
spectral information:
| spectral class | B2 | source: 96 | |
| Morgan-Keenan | B3Ve | source: 25 | |
| B-magnitude | 4,5 ±0,05 | B-V-magnitude | -0,1 |
| U-magnitude | 3,87 ±0,05 | U-B-magnitude | -0,63 |
double/multiple star system information:
| separation between brightest and second brightest component | 7,2 arcsec |
| magnitude difference between brightest and second brightest component | 0,8 |
| position angle | 132 ° |
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 | |
| 18 | Hipparcos Input Catalog Version 2 Annex |
| Turon, C., et al., "The Hipparcos Input Catalog, Version 2," Centre de Donnees Stellaires Information Bulletin, Vol. 43, p. 5, 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: 6h 26min 23,454sec | DEC: -6° 59' 58,06'' | ±0,02 arcsec |
| position (J2000) | RA: 6h 28min 48,978sec | DEC: -7° 1' 58,44'' | |
| proper motion J1950 (FK4) | RA: -0,0015 arcsec/a | DEC: -0,002 arcsec/a | ±0,004 arcsec/a in RA ±0,003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0011 arcsec/a | DEC: 0 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4,7 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | B2e |
| 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: 8412 |
| Durchmusterung | BD-06 1574 |
| Boss General Catalogue | 8412 |
| Henry Draper Catalogue | 45725 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 6h 28,8min | DEC: -7° 2' |
| proper motion (J2000) | RA: -0,037 arcsec/a | DEC: 0 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 | 1831 | 87 | 132° | 7,2'' | 4,7 | 5,2 | B3Ve B3ne | STF 919 |
| AC | 1831 | 25 | 125° | 9,9'' | 5,1 | 6,1 | B3Ve B3e | STF 919 |
| AD | 1878 | 5 | 56° | 25,9'' | 4,7 | 12,2 | B3Ve | BU 570 |
| BC | 1831 | 78 | 102° | 2,5'' | 5,7 | 6,2 | B3Ve B3e | STF 919 |
| 1992 | 107° | 2,9'' | ||||||
| Cc | 1988 | 1 | 141° | 0,3'' | 5,6 | - | - | CHR 167 |
discoverer information:
| discoverer code | discoverer | reference |
| STF 919 | Struve, F.G.W. | - |
| BU 570 | Burnham, S.W. | - |
| CHR 167 | - | - |
notes:
| note | Beta Mon. A,B, and C are shell stars. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (J1950) | RA: 6h 26min 23,7sec | DEC: -7° 0' 0'' |
variability informations:
| magnitute at max. brightness | 3,75 |
| magnitute at min. brightness | |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | BE |
references
| to a study | 671390D (designation: HR 2356/8) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |