S Sagitta
catalogues and names
| catalogues and names | S Sge, 10 Sge, HR 7609, HD 188727, SAO 105436, BD +16 4067 |
| constellation | Sagitta |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 19h 56min 1.3sec | DEC: +16° 38' 5'' | ||
| position (2000.72) | RA: 19h 56min 3sec | DEC: +16° 38' 12'' | ||
| position (B1900) | RA: 19h 51min 28.6sec | DEC: +16° 22' 11'' | ||
| proper motion (J2000) | RA: 0.004 arcsec/a | DEC: -0.004 arcsec/a | ||
| radial velocity | -10 km/s note: spectroscopic binaries note: orbital data avaible |
|||
| rotational velocity | 20 km/s | |||
| trigonometric parallax | 0.009 arcsec | |||
| galactic coordinates | longitude: 55.17° | latitude: -6.12° | ||
| note (category: radial and/or rotational velocities): | Also varies with period 8.4d. |
magnitude
| visual magnitude | 5.36 (V on UBV Johnson system) |
spectral / color information
| spectral class | G5Ib |
| B-V-magnitude | 0.67 |
| U-B-magnitude | 0.42 |
| R-I-magnitude |
variability information
| variable star identification | S Sge |
| note (category: variability): | CDelta 5.28 - 6.04V, 8.382173d. Period varies. Spectrum varies, F6Ib-G5Ib. |
double/multiple star system information
| note (category: spectroscopic binaries): | 676.2d, K 15.0k/s, V0 -10.0k/s, asini 135. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 19h 56min 1.269sec | DEC: +16° 38' 5.18'' | ±0.35 arcsec | source: 17 |
| position (2000.72) | RA: 19h 56min 3sec | DEC: +16° 38' 12'' | JD: 2451806.24 | |
| proper motion (J2000) | RA: 0.0002 arcsec/a | DEC: -0.009 arcsec/a | source: 25 | |
| radial velocity | -10 km/s | source: 25 | ||
| trigonometric parallax | 0.009 arcsec | ±0.001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 55.17° | latitude: -6.12° | ||
magnitude:
| visual | 5.3 (observed) | source: 31 |
| photographic | 5.8 | source: 16 |
spectral information:
| spectral class | G0 | source: 96 | |
| Morgan-Keenan | G5Ib | source: 25 | |
| B-magnitude | 6.03 ±0.05 | B-V-magnitude | 0.67 |
| U-magnitude | 6.45 ±0.05 | U-B-magnitude | 0.42 |
variability information:
| variability type | 111 |
| var. amplitude | 0.8 |
| var. period | 8.38 |
| var. epoch | 2442679 23. September 1975, 12:00:00 UT |
| next max light | 2451813.2 25. September 2000, 16:48:00 UT |
sources:
| 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 | |
| 17 | ACRS |
| Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 1991 | |
| 25 | Bright Star Catalogue, 5th edition |
| Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994 | |
| 30 | GCVS, 4th edition |
| Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88 | |
| 31 | CRM' (non-GCVS variable data) |
| 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 (B1950) | RA: 19h 53min 44.919sec | DEC: +16° 30' 3.99'' | ±0.02 arcsec |
| position (2000.72) | RA: 19h 56min 3sec | DEC: +16° 38' 12'' | JD: 2451806.24 |
| position (J2000) | RA: 19h 56min 1.283sec | DEC: +16° 38' 5.4'' | |
| proper motion B1950 (FK4) | RA: 0.0002 arcsec/a | DEC: -0.003 arcsec/a | ±0.004 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0003 arcsec/a | DEC: -0.004 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5.5 (accuracy: 1 decimal) |
| source of visual magnitude data | Source cited in source catalog introduction. |
spectral information:
| spectral class | G0p |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
remarks for duplicity and variability
| Variable star in visual magnitude in source catalog |
catalogues
| source catalogue | GC, catalogue number: 27601 |
| Durchmusterung | BD+16 4067 |
| Boss General Catalogue | 27601 |
| Henry Draper Catalogue | 188727 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 19h 53min 44.9sec | DEC: +16° 30' 4'' |
variability informations:
| variability type | DCEP | pulsating variable star |
| magnitute at max. brightness | 5.24 | |
| magnitute at min. brightness | 6.04 | |
| photometric system | visual, photovisual or Johnson's V | |
| epoch for maximum light [JD] | 2442678.792 23. September 1975, 07:00:29 UT |
|
| period [d] | 8.382086 | |
| next maximum light [JD] | 2451806.883654 19. September 2000, 09:12:28 UT |
|
| rising time | 31 % of period |
spectral information
| spectral class | F6Ib-G5Ib |
references
| to a study | Vol. I GCVS (see Kholopov et al. 1985-1988) |
| to a chart/photograph | Vol. I GCVS (see Kholopov et al. 1985-1988) |
miscanellous
| ID in the GCVS catalogue | 71/2 |
| constellation | Sagitta |
| notes on existence | The star is equivalent to '0710003 T'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| DCEP | These are the classical cepheids, or Delta Cep-type variables. Comparatively young objects that have left the main sequence and evolved into the instability strip of the Hertzsprung-Russell (H-R) diagram, they obey the well-known Cepheid period-luminosity relation and belong to the young disk population. DCEP stars are present in open clusters. They display a certain relation between the shapes of their light curves and their periods. |