e Arietis
| catalogues and names | e Ari, NSV 01001, 48 Ari, HR 887, HD 18519, SAO 75673, WDS 02592+2120B |
| constellation | Aries |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 2h 59min 12,7sec | DEC: +21° 20' 25'' |
| position (J1900) | RA: 2h 53min 29,5sec | DEC: +20° 56' 26'' |
| proper motion (J2000) | RA: -0,017 arcsec/a | DEC: -0,005 arcsec/a |
| radial velocity | -6 km/s note: variable radial velocity |
|
| rotational velocity | 66 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,005 arcsec | |
| note (category: dynamical parallaxes): | 0.012". |
magnitude
| visual magnitude | 4,63 (V on UBV Johnson system) |
spectral / color information
| spectral class | A2V s |
| B-V-magnitude | 0,04 |
| U-B-magnitude | 0,08 |
| R-I-magnitude | 0,02 |
variability information
| variable star identification | 1001 |
| note (category: variability): | Uncertain if HR 887 or 888 is the variable suspect. |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 1,5 arcsec |
| mag difference (of double or brightest multiple) | 0,3 |
| component ID | AB |
| note (category: double and multiple data): | Binary with HR 888. Mag. and colors for combined light. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 2h 59min 12,713sec | DEC: +21° 20' 25,19'' | ±0,35 arcsec | source: 17 |
| proper motion (J2000) | RA: -0,001 arcsec/a | DEC: -0,004 arcsec/a | source: 25 | |
| radial velocity | -6 km/s | source: 25 | ||
| trigonometric parallax | 0,005 | - | source: 25 | |
| galactic coord. (B1950) | longitude: 158,7° | latitude: -32,51° | ||
| GCI unit vector (J2000) | X: 0,660885 | Y: 0,656355 | Z: 0,363907 | |
magnitude:
| visual | 4,63 (observed) | source: 25 |
| photovisual | 5,6 | source: 2 |
| photographic | 5,6 | source: 16 |
spectral information:
| spectral class | A2 | source: 16 | |
| Morgan-Keenan | A2Vs | source: 25 | |
| B-magnitude | 4,67 ±0,05 | B-V-magnitude | 0,04 |
| U-magnitude | 4,75 ±0,05 | U-B-magnitude | 0,08 |
double/multiple star system information:
| separation between brightest and second brightest component | 1,5 arcsec |
| magnitude difference between brightest and second brightest component | 0,3 |
| position angle | 208 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 4,63 | A2 | e Arietis, 48 Ari, HR 887, HD 18519, SAO 75673 |
| B | 4,63 | A2 | e Arietis, 48 Ari, HR 888, HD 18520, SAO 75673 |
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 | |
data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)
position and proper motion:
| position (J1950) | RA: 2h 56min 20,825sec | DEC: +21° 8' 29,91'' | ±0,009 arcsec |
| position (J2000) | RA: 2h 59min 12,696sec | DEC: +21° 20' 25,1'' | |
| proper motion J1950 (FK4) | RA: -0,0012 arcsec/a | DEC: -0,002 arcsec/a | ±0,002 arcsec/a in RA ±0,002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0012 arcsec/a | DEC: -0,005 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4,6 (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: 3582 |
| Durchmusterung | BD+20 484 |
| Boss General Catalogue | 3582 |
| Henry Draper Catalogue | 18519 The "SAO Catalog" entry refers to two consecutive HD numbers, the lower of which is given. |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 2h 59,2min | DEC: +21° 20' |
| proper motion (J2000) | RA: -0,014 arcsec/a | DEC: -0,004 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 | 1827 | often | 186° | 0,5'' | 5,2 | 5,5 | A2Vs A2Vs | STF 333 |
| 1992 | 208° | 1,5'' | ||||||
| AC | 1912 | 2 | 192° | 145,4'' | - | 12,7 | - | STF 333 |
| 1922 | 191° | 146,3'' |
discoverer information:
| discoverer code | discoverer | reference |
| STF 333 | Struve, F.G.W. | - |
notes:
| note | Epsilon Ari. Variable velocity suspected. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (J1950) | RA: 2h 56min 20,8sec | DEC: +21° 8' 30'' |
variability informations:
| variability type | - |
| magnitute at max. brightness | 4,63 |
| magnitute at min. brightness | |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | A2 |
references
| to a study | 0132D (designation: 333) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |