z2Aquarii
catalogues and names
| catalogues and names | z2Aqr, NSV 25909, 55 Aqr, HR 8559, HD 213052, SAO 146108, BD +0 4365 A, WDS 22288-0001A |
| constellation | Aquarius |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 22h 28min 50,1sec | DEC: -0° 1' 12'' | ||
| position (2001,18) | RA: 22h 28min 54sec | DEC: -0° 0' 50'' | ||
| position (B1900) | RA: 22h 23min 41sec | DEC: -0° 31' 56'' | ||
| proper motion (J2000) | RA: 0,209 arcsec/a | DEC: 0,042 arcsec/a | ||
| radial velocity | 25 km/s | |||
| rotational velocity | 58 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0,022 arcsec | |||
| galactic coordinates | longitude: 65,35° | latitude: -46,33° | ||
| note (category: dynamical parallaxes): | 0.039". |
magnitude
| visual magnitude | 4,42 (original HR magnitude) |
spectral / color information
| spectral class | F3V |
| B-V-magnitude | 0,38 |
| U-B-magnitude | -0,01 |
| R-I-magnitude | |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 1,8 arcsec |
| mag difference (of double or brightest multiple) | 0,2 |
| note (category: double and multiple data): | Binary with HR 8558. AB 4.31 F2IV, 4.51 F3IV, 856.0y, a = 5.055". Magnitude for blend 3.65V, combined colors. Component B, HR 8558, is an astrometric binary. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 22h 28min 49,89sec | DEC: -0° 1' 12,72'' | ±0,43 arcsec | source: 16 |
| position (2001,18) | RA: 22h 28min 54sec | DEC: -0° 0' 51'' | JD: 2451974,81 | |
| proper motion (J2000) | RA: 0,0131 arcsec/a | DEC: 0,031 arcsec/a | source: 25 | |
| radial velocity | 25 km/s | source: 25 | ||
| trigonometric parallax | 0,022 arcsec | ±0,002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 65,36° | latitude: -46,33° | ||
magnitude:
| visual | 4,29 (observed) | source: 25 |
| photovisual | 4,4 | source: 2 |
| photographic | 4,8 | source: 2 |
spectral information:
| spectral class | F2 | source: 29 | |
| Morgan-Keenan | F3V | source: 25 | |
| B-magnitude | 4,66 ±0,05 | B-V-magnitude | 0,37 |
| U-magnitude | 4,66 ±0,05 | U-B-magnitude | 0 |
double/multiple star system information:
| separation between brightest and second brightest component | 2 arcsec |
| magnitude difference between brightest and second brightest component | 0,2 |
| position angle | 198 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 4,29 | F2 | z2Aquarii, 55 Aqr, HR 8559, HD 213052, SAO 146108 |
| B | 4,52 | F2 | z1Aquarii, 55 Aqr, HR 8558, HD 213051, SAO 146107 |
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 | |
| 29 | SAOJ2000 |
| SAO on FK5 at J2000, 1989 | |
data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)
position and proper motion:
| position (B1950) | RA: 22h 26min 15,514sec | DEC: -0° 16' 36,08'' | ±0,013 arcsec |
| position (2001,18) | RA: 22h 28min 53sec | DEC: -0° 0' 53'' | JD: 2451974,81 |
| position (J2000) | RA: 22h 28min 50,053sec | DEC: -0° 1' 12,18'' | |
| proper motion B1950 (FK4) | RA: 0,0138 arcsec/a | DEC: 0,047 arcsec/a | ±0,002 arcsec/a in RA ±0,002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,014 arcsec/a | DEC: 0,042 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4,4 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | F2 |
| 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: 31399 |
| Durchmusterung | BD-00 4365A |
| Boss General Catalogue | 31399 |
| Henry Draper Catalogue | 213052 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 22h 28,8min | DEC: -0° 1' |
| proper motion (J2000) | RA: 0,18 arcsec/a | DEC: 0,039 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 |
| - | 1821 | often | 358° | 3,8'' | 4,3 | 4,5 | F3IV-V | STF2909 |
| 1994 | 198° | 2'' |
discoverer information:
| discoverer code | discoverer | reference |
| STF2909 | Struve, F.G.W. | - |
notes:
| note | P = 760yr., a = 4.51", motion retrograde. A companion which may have been resolved accompanies one of the stars, P = 25.7yr. Proper motion of B +176 +013. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
| position (B1900) | RA: 22h 23,7min | DEC: -0° 32' |
magnitudes, spectral classes, orbital elements:
| author: | R.S. Harrington | R.S. Harrington |
| date of observation: | 1967 | 1967 |
| magnitude of component A: | 4,31 | 4,51 |
| magnitude of component B: | 4,31 | 4,51 |
| spectral class component B: | F3V | |
| spectral class component B: | F3V | |
| period [y]: | 856 | 25,5 |
| semi-major axis [arcsec]: | 5,055 | 0,072 |
| inclination [deg]: | 131,25 | 55,62 |
| node [deg]: | 310,22 (ascending) | 19,61 |
| equinox of node: | 2000 | 2000 |
| eccentricity: | 0,495 | 0,26 |
| time of periastron passage: | 1957,6 | 1954,5 |
| dates of ephemeris: | 1968-1977 | |
| grade: | preliminary | |
| reference: | Astron. J. 73, 508; 1968. | Ibid. |
| notes | The unseen star is associated with the visual secondary. Suspected variability of one of the components is unconfirmed. |