e Equulei
| catalogues and names | e Equ, 1 Equ, HR 8034, HD 199766, SAO 126428, WDS 20591+0418A |
| constellation | Equuleus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 20h 59min 4,4sec | DEC: +4° 17' 37'' |
| position (J1900) | RA: 20h 54min 4,6sec | DEC: +3° 54' 36'' |
| proper motion (J2000) | RA: -0,109 arcsec/a | DEC: -0,148 arcsec/a |
| radial velocity | 18 km/s note: spectroscopic binaries, single lined spectra note: orbital data avaible |
|
| rotational velocity | 54 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,021 arcsec | |
| note (category: dynamical parallaxes): | 0.020". |
magnitude
| visual magnitude | 5,23 (V on UBV Johnson system) |
spectral / color information
| spectral class | F6IV |
| B-V-magnitude | 0,46 |
| U-B-magnitude | 0,02 |
| R-I-magnitude | 0,28 |
double/multiple star system information
| number of components of multiple star system | 4 |
| separation | 1 arcsec |
| mag difference (of double or brightest multiple) | 0,3 |
| component ID | AB |
| note (category: double and multiple data): | AB 6.0 F5IV, 6.3 F7IV, 101.485y, a = 0.647". Combined mag., colors. Component C, 7.2v G0V at 11", CPM. |
| note (category: spectroscopic binaries): | 2.0313d, K 15.8k/s, V0 +7.8k/s, asini 0.435. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 20h 59min 4,468sec | DEC: +4° 17' 36,63'' | ±0,2 arcsec | source: 52 |
| proper motion (J2000) | RA: -0,0071 arcsec/a | DEC: -0,149 arcsec/a | source: 25 | |
| radial velocity | 18 km/s | source: 25 | ||
| trigonometric parallax | 0,021 | ±0,002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 52,88° | latitude: -25,78° | ||
| GCI unit vector (J2000) | X: 0,702269 | Y: -0,707964 | Z: 0,074866 | |
magnitude:
| visual | 5,31 (observed) | source: 25 |
| photovisual | 5,3 | source: 2 |
| photographic | 5,8 | source: 16 |
spectral information:
| spectral class | F5 | source: 96 | |
| Morgan-Keenan | F6IV | source: 25 | |
| B-magnitude | 5,77 ±0,05 | B-V-magnitude | 0,46 |
| U-magnitude | 5,78 ±0,05 | U-B-magnitude | 0,01 |
double/multiple star system information:
| magnitude difference between brightest and second brightest component | 0,5 |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 5,31 | F5 | e Equulei, 1 Equ, HR 8034, HD 199766, SAO 126428 |
| B | 7,35 | F5 |
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 | |
| 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 | |
| 52 | PPMN-HP subset |
| PPMN Star Catalogue (Reference 16) High-Precision Subset (Code H) | |
| 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: 20h 56min 34,503sec | DEC: +4° 6' 2,5'' | ±0,016 arcsec |
| position (J2000) | RA: 20h 59min 4,417sec | DEC: +4° 17' 37,03'' | |
| proper motion J1950 (FK4) | RA: -0,0075 arcsec/a | DEC: -0,144 arcsec/a | ±0,002 arcsec/a in RA ±0,002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0073 arcsec/a | DEC: -0,148 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 | F5 |
| 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: 29276 |
| Durchmusterung | BD+03 4473AB |
| Boss General Catalogue | 29276 |
| Henry Draper Catalogue | 199766 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 20h 59,1min | DEC: +4° 18' |
| proper motion (J2000) | RA: -0,1 arcsec/a | DEC: -0,154 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 | 1835 | often | ° | '' | 5,8 | 6,3 | F6IV | STF2737 |
| AB-C | 1833 | often | 78° | 10,8'' | 5,42 | 7,35 | - | STF2737 |
| 1991 | 68° | 10,6'' | ||||||
| AD | 1912 | 2 | 279° | 77,1'' | 5,3 | 12,4 | - | STF2737 |
| 1924 | 280° | 74,8'' | ||||||
| BC | 1893 | 5 | 78° | 10,7'' | - | - | - | STF2737 |
| 1982 | 69° | 11,2'' |
discoverer information:
| discoverer code | discoverer | reference |
| STF2737 | Struve, F.G.W. | - |
notes:
| note | Epsilon Equ. P = 101yr., a = 0.66", motion retrograde in a highly-inclined orbit. Proper motion of C -135 -153. One component is a spectroscopic binary, and C is physical, so that the system is quadruple. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
| position (J1900) | RA: 20h 54,1min | DEC: +3° 55' |
magnitudes, spectral classes, orbital elements:
| author: | W.H. van den Bos |
| date of observation: | 1932 |
| magnitude of component A: | 5,8 |
| magnitude of component B: | 5,8 |
| spectral class component B: | F6IV |
| spectral class component B: | F6IV |
| period [y]: | 101,4 |
| semi-major axis [arcsec]: | 0,656 |
| inclination [deg]: | 92,8 |
| node [deg]: | 105,2 |
| equinox of node: | 1900 |
| eccentricity: | 0,702 |
| time of periastron passage: | 1920,21 |
| dates of ephemeris: | 1932-1965 |
| grade: | good |
| reference: | Union Obs. Circ. 3, 388; 1933. |
| notes | Quadruple system. Star A is a single-lined spectroscopic binary, P = 2.03 d. Star C (mag. 7.3, dF4) is in slow retrograde motion at 10". |