d Sagitta
| catalogues and names | d Sge, del Sge, 7 Sge, HR 7536, HD 187076, SAO 105259, FK5: 743, WDS 19474+1832 |
| constellation | Sagitta |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 19h 47min 23,3sec | DEC: +18° 32' 3'' |
| position (J1900) | RA: 19h 42min 55,7sec | DEC: +18° 17' 15'' |
| proper motion (J2000) | RA: 0,007 arcsec/a | DEC: 0,008 arcsec/a |
| radial velocity | 3 km/s note: spectroscopic binaries note: orbital data avaible |
|
| rotational velocity | =<50 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,001 arcsec | |
magnitude
| visual magnitude | 3,82 (V on UBV Johnson system) |
spectral / color information
| spectral class | M2II+A0V |
| B-V-magnitude | 1,41 |
| U-B-magnitude | 0,96 |
| R-I-magnitude | 1,29 |
variability information
| variable star identification | Del Sge |
| note (category: variability): | Amp. 0.09p. |
double/multiple star system information
| note (category: double and multiple data): | Suspected visual double probably single image, composite spectrum. Secondary either B6 or A0V. |
| note (category: spectroscopic binaries): | 3725d, K 7.5k/s, V0 +1.9k/s, asini 364, vsini of both components =<50k/s. |
miscellaneous information
| note (category: group membership): | In reflection nebula; Gamma Cas-type nebula. Assoc. of Delta Sge with nebula probable but not certain; nebula could be HII region excited by O8f star, 9 Sge, HR 7574. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 19h 47min 23,27sec | DEC: +18° 32' 3,34'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0,0005 arcsec/a | DEC: 0,008 arcsec/a | source: 25 | |
| radial velocity | 3 km/s | source: 25 | ||
| trigonometric parallax | 0,001 | - | source: 25 | |
| galactic coord. (B1950) | longitude: 55,77° | latitude: -3,38° | ||
| GCI unit vector (J2000) | X: 0,428186 | Y: -0,84594 | Z: 0,317872 | |
magnitude:
| visual | 3,82 (observed) | source: 25 |
| photovisual | 3,8 | source: 2 |
spectral information:
| spectral class | A0 | source: 96 | |
| Morgan-Keenan | M2II | source: 25 | |
| B-magnitude | 5,23 ±0,05 | B-V-magnitude | 1,41 |
| U-magnitude | 6,19 ±0,05 | U-B-magnitude | 0,96 |
variability information:
| variability type | 170 |
| var. amplitude | 0 |
double/multiple star system information:
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 3,75 | +++ | |
| B | 3,82 | A0 | d Sagitta, 7 Sge, HR 7536, HD 187076, SAO 105259 |
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 | |
| 27 | Catalog of Red Magnitudes (CRM) |
| Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 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 (J1950) | RA: 19h 45min 9,429sec | DEC: +18° 24' 34,69'' | ±0,004 arcsec |
| position (J2000) | RA: 19h 47min 23,277sec | DEC: +18° 32' 3,41'' | |
| proper motion J1950 (FK4) | RA: 0,0005 arcsec/a | DEC: 0,01 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0006 arcsec/a | DEC: 0,009 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3,8 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | +++ |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 743 |
| Durchmusterung | BD+18 4240 |
| Boss General Catalogue | 27391 |
| Henry Draper Catalogue | 187076 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: 19h 47,4min | DEC: +18° 32' |
| proper motion (J2000) | RA: 0,007 arcsec/a | DEC: 0,008 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 |
| - | 1975 | 12 | ° | '' | 3,82 | - | M2II+A0V | BLA |
discoverer information:
| discoverer code | discoverer | reference |
| BLA | Blazit, A. et al |
notes:
| note | Delta Sge, a variable. P = 9.7yr., a = 0.05", motion retrograde. |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (J1950) | RA: 19h 45min 9,4sec | DEC: +18° 24' 35'' |
variability informations:
| variability type | LB: | pulsating variable star |
| magnitute at max. brightness | 3,75 | |
| magnitute at min. brightness | 3,83 | |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | M2.5II-III+B9V |
references
| to a study | Vol. I GCVS (see Kholopov et al. 1985-1988) |
| to a chart/photograph | no chart is avaible, but the star is contained in the 'Bonner Durchmusterung' |
miscanellous
| ID in the GCVS catalogue | 71/9004 |
| constellation | Sculptor |
| notes on existence | The star is equivalent to '0720001 R'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| LB | Slow irregular variables. The light variations of these stars show no evidence of periodicity, or any periodicity present is very poorly defined and appears only occasionally. Like for the type I, stars are often attributed to this type because of being insufficiently studied. Many type L variables are really semiregulars or belong to other types. LB Slow irregular variables of late spectral types (K, M, C, S); as a rule, they are giants (CO Cyg). This type is also ascribed, in the GCVS, to slow red irregular variables in the case of unknown spectral types and luminosities. LC Irregular variable supergiants of late spectral types having amplitudes of about 1 mag in V (TZ Cas). |