89 Aquarii
catalogues and names
| catalogues and names | 89 Aqr, HR 8817, HD 218640, SAO 191687, CD -23 17771, WDS 23099-2227A |
| constellation | Aquarius |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 23h 9min 54.8sec | DEC: -22° 27' 27'' | ||
| position (B1900) | RA: 23h 4min 34.5sec | DEC: -22° 59' 58'' | ||
| proper motion (J2000) | RA: 0.026 arcsec/a | DEC: -0.009 arcsec/a | ||
| radial velocity | -5 km/s | |||
| trigonometric parallax | 0.04 arcsec | |||
| galactic coordinates | longitude: 38.81° | latitude: -66.53° | ||
magnitude
| visual magnitude | 4.69 (V on UBV Johnson system) |
spectral / color information
| spectral class | G2IV+A2V |
| B-V-magnitude | 0.65 |
| U-B-magnitude | 0.39 |
| R-I-magnitude | |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
| note (category: spectra): | Also classified G2III + A2V. |
double/multiple star system information
| separation | 0.4 arcsec |
| mag difference (of double or brightest multiple) | 0.8 |
| note | Worley (1978) update of the IDS |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 23h 9min 54.912sec | DEC: -22° 27' 27.79'' | ±0.19 arcsec | source: 16 |
| proper motion (J2000) | RA: 0.0027 arcsec/a | DEC: -0.016 arcsec/a | source: 25 | |
| radial velocity | -5 km/s | source: 25 | ||
| trigonometric parallax | 0.04 arcsec | ±0.004 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 38.82° | latitude: -66.53° | ||
magnitude:
| visual | 4.69 (observed) | source: 25 |
| photovisual | 4.7 | source: 16 |
| photographic | 5.4 | source: 2 |
spectral information:
| spectral class | G0 | source: 96 | |
| Morgan-Keenan | G2IV | source: 25 | |
| B-magnitude | 5.34 ±0.05 | B-V-magnitude | 0.65 |
| U-magnitude | 5.73 ±0.05 | U-B-magnitude | 0.39 |
double/multiple star system information:
| separation between brightest and second brightest component | 0.2 arcsec |
| magnitude difference between brightest and second brightest component | 0.6 |
| position angle | 286 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 4.69 | G0 | 89 Aqr, HR 8817, HD 218640, SAO 191687 |
| B | 5.05 | +++ |
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 | |
| 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: 23h 7min 14.783sec | DEC: -22° 43' 43.97'' | ±0.021 arcsec |
| position (J2000) | RA: 23h 9min 54.828sec | DEC: -22° 27' 27.17'' | |
| proper motion B1950 (FK4) | RA: 0.0018 arcsec/a | DEC: -0.005 arcsec/a | ±0.004 arcsec/a in RA ±0.004 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0018 arcsec/a | DEC: -0.009 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.9 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | +++ |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 32262 |
| Durchmusterung | CD-2317771 |
| Boss General Catalogue | 32262 |
| Henry Draper Catalogue | 218640 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: 23h 9.9min | DEC: -22° 27' |
| proper motion (J2000) | RA: 0.036 arcsec/a | DEC: -0.014 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 |
| - | 1935 | 30 | 38° | 0.4'' | 5.2 | 5.8 | G2IV+A2 | RST3320 |
| 1991 | 286° | 0.2'' |
discoverer information:
| discoverer code | discoverer | reference |
| RST3320 | Rossiter, R.A. | - |
notes:
| note | 89 Aqr. |