7 Aquarii
catalogues and names
| catalogues and names | NSV 13419, 7 Aqr, HR 8015, HD 199345, SAO 144968, BD -10 5553, WDS 20569-0942A |
| constellation | Aquarius |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 20h 56min 54sec | DEC: -9° 41' 51'' | ||
| position (B1900) | RA: 20h 51min 29.8sec | DEC: -10° 4' 51'' | ||
| proper motion (J2000) | RA: -0.003 arcsec/a | DEC: -0.01 arcsec/a | ||
| radial velocity | -33 km/s note: suspected variable radial velocity |
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| galactic coordinates | longitude: 38.63° | latitude: -32.24° | ||
magnitude
| visual magnitude | 5.51 (V on UBV Johnson system) |
spectral / color information
| spectral class | gK5 |
| B-V-magnitude | 1.47 |
| U-B-magnitude | 1.71 |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
variability information
| variable star identification | 13419 |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 176.6 arcsec |
| mag difference (of double or brightest multiple) | 3.5 |
| component ID | AC |
| note (category: double and multiple data): | AB fixed sep. B, 11.8v at 36". |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 20h 56min 54.038sec | DEC: -9° 41' 51.37'' | ±0.35 arcsec | source: 34 |
| proper motion (J2000) | RA: -0.0001 arcsec/a | DEC: -0.012 arcsec/a | source: 25 | |
| radial velocity | -33 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 38.64° | latitude: -32.24° | ||
magnitude:
| visual | 5.51 (observed) | source: 25 |
| photovisual | 5.2 | source: 16 |
| photographic | 6.8 | source: 2 |
spectral information:
| spectral class | K2 | source: 96 | |
| Morgan-Keenan | gK5 | source: 25 | |
| B-magnitude | 6.98 ±0.05 | B-V-magnitude | 1.47 |
| U-magnitude | 8.69 ±0.05 | U-B-magnitude | 1.71 |
double/multiple star system information:
| separation between brightest and second brightest component | 2.1 arcsec |
| magnitude difference between brightest and second brightest component | 5.7 |
| position angle | 165 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 5.51 | K2 | 7 Aqr, HR 8015, HD 199345, SAO 144968 |
| B | 9.3 | M7 |
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 | |
| 34 | IRS Catalog |
| Corbin, T.E., 1991, U.S. Naval Observatory, International Reference Stars Catalog | |
| 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: 20h 54min 11.949sec | DEC: -9° 53' 25.41'' | ±0.013 arcsec |
| position (J2000) | RA: 20h 56min 54.036sec | DEC: -9° 41' 51.03'' | |
| proper motion B1950 (FK4) | RA: -0.0004 arcsec/a | DEC: -0.008 arcsec/a | ±0.003 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0002 arcsec/a | DEC: -0.01 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5.7 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | K2 |
| 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: 29220 |
| Durchmusterung | BD-10 5553 |
| Boss General Catalogue | 29220 |
| Henry Draper Catalogue | 199345 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 20h 56.9min | DEC: -9° 42' |
| proper motion (J2000) | RA: -0.003 arcsec/a | DEC: -0.01 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 | 1888 | 7 | 165° | 2.1'' | 5.7 | 11.4 | gK5 | BU 1034 |
| AC | 1912 | 1 | 67° | 176.6'' | 5.7 | 9.2 | - | BU 1034 |
discoverer information:
| discoverer code | discoverer | reference |
| BU 1034 | Burnham, S.W. | - |
notes:
| note | 7 Aqr. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 20h 54min 11.9sec | DEC: -9° 53' 25'' |
variability informations:
| magnitute at max. brightness | 5.48 |
| magnitute at min. brightness | 5.51 |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | K5 |
references
| to a study | 0807D (designation: 24G AQR) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |