e Monocerotis
| catalogues and names | e Mon, 8 Mon, HR 2298, HD 44769, SAO 113810, FK5: 244, WDS 06238+0436A |
| constellation | Monoceros |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 6h 23min 46,1sec | DEC: +4° 35' 34'' |
| position (J1900) | RA: 6h 18min 28,1sec | DEC: +4° 38' 38'' |
| proper motion (J2000) | RA: -0,018 arcsec/a | DEC: 0,011 arcsec/a |
| radial velocity | 15 km/s note: spectroscopic binaries |
|
| rotational velocity | 124 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,025 arcsec | |
magnitude
| visual magnitude | 4,44 (V on UBV Johnson system) |
spectral / color information
| spectral class | A5IV |
| B-V-magnitude | 0,18 |
| U-B-magnitude | 0,13 |
| R-I-magnitude | 0,1 |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 12,9 arcsec |
| mag difference (of double or brightest multiple) | 2,2 |
| component ID | AB |
| note (category: double and multiple data): | Binary with HR 2299. Combined light 4.30V, +0.21(B-V). Component C, 12.2v at 93". |
| note (category: spectroscopic binaries): | 331d? Unresolved by speckle interferometry. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 6h 23min 46,084sec | DEC: +4° 35' 34,24'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: -0,0012 arcsec/a | DEC: 0,011 arcsec/a | source: 25 | |
| radial velocity | 15 km/s | source: 25 | ||
| trigonometric parallax | 0,025 | ±0,002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 205,68° | latitude: -4,03° | ||
| GCI unit vector (J2000) | X: -0,10319 | Y: 0,991433 | Z: 0,080074 | |
magnitude:
| visual | 4,44 (observed) | source: 25 |
| photovisual | 4,5 | source: 2 |
spectral information:
| spectral class | A5 | source: 96 | |
| Morgan-Keenan | A5IV | source: 25 | |
| B-magnitude | 4,62 ±0,05 | B-V-magnitude | 0,18 |
| U-magnitude | 4,75 ±0,05 | U-B-magnitude | 0,13 |
double/multiple star system information:
| separation between brightest and second brightest component | 12,7 arcsec |
| magnitude difference between brightest and second brightest component | 2,28 |
| position angle | 27 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 4,44 | A5 | e Monocerotis, 8 Mon, HR 2298, HD 44769, SAO 113810 |
| B | 6,72 | A5 | HR 2299, HD 44770, SAO 113811 |
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 | |
| 15 | FK5, FK5 Extension and FK5 Supplement |
| Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 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 (J1950) | RA: 6h 21min 7,05sec | DEC: +4° 37' 11,68'' | ±0,005 arcsec |
| position (J2000) | RA: 6h 23min 46,093sec | DEC: +4° 35' 34,22'' | |
| proper motion J1950 (FK4) | RA: -0,0013 arcsec/a | DEC: 0,01 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0011 arcsec/a | DEC: 0,011 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4,5 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | A5 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 244 |
| Durchmusterung | BD+04 1236 |
| Boss General Catalogue | 8240 |
| Henry Draper Catalogue | 44769 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 6h 23,8min | DEC: +4° 36' |
| proper motion (J2000) | RA: -0,018 arcsec/a | DEC: 0,011 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 | 39 | 27° | 13,9'' | 4,44 | 6,72 | A5IV F5V | STF 900 |
| 1985 | - | 12,7'' | ||||||
| AC | 1911 | 2 | 254° | 93,6'' | 4,44 | 12,7 | - | STF 900 |
discoverer information:
| discoverer code | discoverer | reference |
| STF 900 | Struve, F.G.W. | - |
notes:
| note | Epsilon Mon. A is a spectroscopic binary, P = 331d? B is BD+04@1237. Proper motion of B +034 -068. |