o Sagittarii
catalogues and names
| catalogues and names | o Sgr, NSV 11703, 39 Sgr, HR 7217, HD 177241, SAO 187643, BD -21 5237, WDS 19047-2144 |
| constellation | Sagittarius |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 19h 4min 41sec | DEC: -21° 44' 30'' | ||
| position (B1900) | RA: 18h 58min 41.4sec | DEC: -21° 53' 17'' | ||
| proper motion (J2000) | RA: 0.08 arcsec/a | DEC: -0.06 arcsec/a | ||
| radial velocity | 25 km/s | |||
| trigonometric parallax | 0.044 arcsec | |||
| galactic coordinates | longitude: 14.71° | latitude: -12.51° | ||
magnitude
| visual magnitude | 3.77 (V on UBV Johnson system) |
spectral / color information
| spectral class | G9IIIb |
| B-V-magnitude | 1.01 |
| U-B-magnitude | 0.85 |
| R-I-magnitude | |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
variability information
| variable star identification | 11703 |
double/multiple star system information
| separation | 35.7 arcsec |
| mag difference (of double or brightest multiple) | 9.9 |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 19h 4min 40.997sec | DEC: -21° 44' 29.57'' | ±0.19 arcsec | source: 16 |
| proper motion (J2000) | RA: 0.0056 arcsec/a | DEC: -0.06 arcsec/a | source: 25 | |
| radial velocity | 25 km/s | source: 25 | ||
| trigonometric parallax | 0.044 arcsec | ±0.004 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 14.72° | latitude: -12.51° | ||
magnitude:
| visual | 3.77 (observed) | source: 25 |
| photovisual | 3.9 | source: 2 |
| photographic | 4.9 | source: 2 |
spectral information:
| spectral class | K0 | source: 96 | |
| Morgan-Keenan | G9IIIb | source: 25 | |
| B-magnitude | 4.78 ±0.05 | B-V-magnitude | 1.01 |
| U-magnitude | 5.63 ±0.05 | U-B-magnitude | 0.85 |
variability information:
| variability type | 9 |
| var. amplitude | 0.13 |
double/multiple star system information:
| separation between brightest and second brightest component | 35.7 arcsec |
| magnitude difference between brightest and second brightest component | 10 |
| position angle | 246 ° |
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: 19h 1min 41.245sec | DEC: -21° 48' 59.52'' | ±0.015 arcsec |
| position (J2000) | RA: 19h 4min 41.005sec | DEC: -21° 44' 29.67'' | |
| proper motion B1950 (FK4) | RA: 0.0057 arcsec/a | DEC: -0.06 arcsec/a | ±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0057 arcsec/a | DEC: -0.06 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3.9 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | K0 |
| 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: 26224 |
| Durchmusterung | BD-21 5237 |
| Boss General Catalogue | 26224 |
| Henry Draper Catalogue | 177241 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 19h 4.7min | DEC: -21° 44' |
| proper motion (J2000) | RA: 0.082 arcsec/a | DEC: -0.059 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 |
| - | 1897 | 3 | 237° | 34'' | 3.77 | 13.8 | G9III | SEE 369 |
| 1949 | 246° | 35.7'' |
discoverer information:
| discoverer code | discoverer | reference |
| SEE 369 | See, T.J. | - |
notes:
| note | Omicron Sgr. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 19h 1min 41.2sec | DEC: -21° 49' 0'' |
variability informations:
| magnitute at max. brightness | 1.38 |
| magnitute at min. brightness | 1.51 |
| photometric system |
spectral information
| spectral class | G8 |
references
| to a study | 690730D (designation: IRC-20536) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |