21 Arietis
catalogues and names
| catalogues and names | 21 Ari, HR 657, HD 13872, SAO 75238, BD +24 329, FK5: 1059, WDS 02157+2503 |
| constellation | Aries |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 2h 15min 42.8sec | DEC: +25° 2' 35'' | ||
| position (B1900) | RA: 2h 10min 2.2sec | DEC: +24° 34' 47'' | ||
| proper motion (J2000) | RA: -0.088 arcsec/a | DEC: -0.087 arcsec/a | ||
| radial velocity | -44 km/s | |||
| dynamical parallax | 0.015 arcsec | |||
| galactic coordinates | longitude: 146.07° | latitude: -34.01° | ||
magnitude
| visual magnitude | 5.58 (V on UBV Johnson system) |
spectral / color information
| spectral class | F6V |
| B-V-magnitude | 0.49 |
| U-B-magnitude | 0.01 |
double/multiple star system information
| separation | 0.2 arcsec |
| mag difference (of double or brightest multiple) | 0.3 |
| note | Worley (1978) update of the IDS |
| note (category: double and multiple data): | 19.35y, a 0.17" or 18.614y, e 0.616, a 0.158", 10.82AU, i 130.1d. Alternate orbit 19.35y, a = 0.17". Speckle interferometric sep. 0.17", 1983.93. |
miscellaneous information
| note (category: miscellaneous): | Possible nearby star on basis of spectroscopic parallax. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 2h 15min 42.774sec | DEC: +25° 2' 35.01'' | ±0.06 arcsec | source: 15 |
| proper motion (J2000) | RA: -0.0065 arcsec/a | DEC: -0.087 arcsec/a | source: 25 | |
| radial velocity | -44 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 146.08° | latitude: -34.01° | ||
magnitude:
| visual | 5.58 (observed) | source: 25 |
| photovisual | 5.6 | source: 2 |
spectral information:
| spectral class | F5 | source: 96 | |
| Morgan-Keenan | F6V | source: 25 | |
| B-magnitude | 6.07 ±0.05 | B-V-magnitude | 0.49 |
| U-magnitude | 6.08 ±0.05 | U-B-magnitude | 0.01 |
double/multiple star system information:
| magnitude difference between brightest and second brightest component | 0.3 |
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 (B1950) | RA: 2h 12min 52.174sec | DEC: +24° 48' 44.52'' | ±0.005 arcsec |
| position (J2000) | RA: 2h 15min 42.77sec | DEC: +25° 2' 35.11'' | |
| proper motion B1950 (FK4) | RA: -0.0065 arcsec/a | DEC: -0.082 arcsec/a | ±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0065 arcsec/a | DEC: -0.086 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5.6 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | F5 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 1059 |
| Durchmusterung | BD+24 329 |
| Boss General Catalogue | 2706 |
| Henry Draper Catalogue | 13872 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 2h 15.7min | DEC: +25° 3' |
| proper motion (J2000) | RA: -0.088 arcsec/a | DEC: -0.087 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 |
| - | 1965 | 70 | ° | '' | 6.5 | 6.8 | F6V | COU 79 |
discoverer information:
| discoverer code | discoverer | reference |
| COU 79 | Couteau, P. | - |
notes:
| note | 21 Ari. P = 23.70yr., a = 0.235", motion retrograde. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
| position (B1900) | RA: 2h 10min | DEC: +24° 35' |
magnitudes, spectral classes, orbital elements:
| author: | P. Couteau, P.J. Morel |
| date of observation: | 1980 |
| magnitude of component A: | 6.2 |
| magnitude of component B: | 6.2 |
| spectral class component B: | F6V |
| spectral class component B: | F6V |
| period [y]: | 19.35 |
| semi-major axis [arcsec]: | 0.17 |
| inclination [deg]: | 135.6 |
| node [deg]: | 134.3 |
| equinox of node: | 2000 |
| eccentricity: | 0.71 |
| time of periastron passage: | 1975.94 |
| grade: | preliminary |
| reference: | Circ. Inf. No. 83, 1981. |
| other name(s) | COU 79, 21 Ari |