R Sagitta
catalogues and names |
SKY2000 - Master Star Catalog |
Smithsonian Astrophysical Observatory Star Catalog |
Combined General Catalogue of Variable Stars (Vol. I-III) |
catalogues and names
catalogues and names | R Sge, HD 192388, SAO 105871, BD +16 4197 |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 20h 14min 3.743sec | DEC: +16° 43' 34.63'' | ±0.43 arcsec | source: 16 |
position (2000.72) | RA: 20h 14min 6sec | DEC: +16° 43' 43'' | JD: 2451809.28 | |
proper motion (J2000) | RA: 0 arcsec/a | DEC: -0.011 arcsec/a | source: 16 | |
radial velocity | 8.3 km/s | source: 11 | ||
galactic coord. (B1950) | longitude: 57.53° | latitude: -9.75° |
magnitude:
visual | 8.97 (observed) | source: 20 |
photographic | 10.6 | source: 16 |
spectral information:
spectral class | G5 | source: 96 | |
Morgan-Keenan | G0Ib | source: 98 | |
B-magnitude | 9.89 ±0.17 | B-V-magnitude | 0.92 |
U-magnitude | 10.73 ±0.27 | U-B-magnitude | 0.84 |
variability information:
variability type | 132 |
var. amplitude | 2.4 |
var. period | 70.77 |
var. epoch | 2443830 17. November 1978, 12:00:00 UT |
next max light | 2451827.01 9. October 2000, 12:14:24 UT |
sources:
11 | General Catalogue of Stellar Radial Velocities |
Wilson, R.E., General Catalogue of Stellar of Stellar Radial Radial Velocities, Washington, DC: Carnegie Institute of Washington, 1953 | |
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 | |
20 | Catalogue of Homogeneous Means in the UBV System |
Mermilliod, J.C., Catalogue of Homogeneous Means in the UBV System, Institut d'Astronomie, Universite de Lausanne, 1994 | |
30 | GCVS, 4th edition |
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88 | |
96 | SAO or HD/HDE Catalog |
Reference from Value 1 or Reference from Value 2 | |
98 | SKYMAP Master Catalog Version 3.7 |
Reference from Value 97 [original data sources Catalog Version 3.7 are identified in SKYMAP Version 3.7] |
data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)
position and proper motion:
position (B1950) | RA: 20h 11min 46.705sec | DEC: +16° 34' 26.2'' | ±0.043 arcsec |
position (2000.72) | RA: 20h 14min 6sec | DEC: +16° 43' 43'' | JD: 2451809.28 |
position (J2000) | RA: 20h 14min 3.775sec | DEC: +16° 43' 35.74'' | |
proper motion B1950 (FK4) | RA: 0 arcsec/a | DEC: 0.008 arcsec/a | ±0.007 arcsec/a in RA ±0.007 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: 0.0001 arcsec/a | DEC: 0.006 arcsec/a | |
source of proper motion data | Determined by source catalog |
magnitude:
visual | 8.6 (accuracy: 1 decimal) |
source of visual magnitude data | Source cited in source catalog introduction. |
spectral information:
spectral class | G5 |
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: 28094 |
Durchmusterung | BD+16 4197 |
Boss General Catalogue | 28094 |
Henry Draper Catalogue | 192388 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
position (equinox 1950.0) | RA: 20h 11min 46.7sec | DEC: +16° 34' 26'' |
variability informations:
variability type | RVB | pulsating variable star |
magnitute at max. brightness | 8 | |
magnitute at min. brightness | 10.4 | |
photometric system | visual, photovisual or Johnson's V | |
epoch for maximum light [JD] | 2443830 17. November 1978, 12:00:00 UT |
|
period [d] | 70.77 | |
next maximum light [JD] | 2451827.01 9. October 2000, 12:14:24 UT |
spectral information
spectral class | G0Ib-G8Ib |
references
to a study | the main characteristics of the star was determined by the authors themselves |
to a chart/photograph | Vol. I GCVS (see Kholopov et al. 1985-1988) |
miscanellous
ID in the GCVS catalogue | 71/1 |
constellation | Sagitta |
notes on existence | The star is equivalent to '0710002 S'. |
There are notes in published catalog. |
variability type description
variability type | description |
RVB | Variables of the RV Tauri type. These are radially pulsating supergiants having spectral types F-G at maximum light and K-M at minimum. The light curves are characterized by the presence of double waves with alternating primary and secondary minima that can vary in depth so that primary minima may become secondary and vice versa. The complete light amplitude may reach 3-4 mag in V. Periods between two adjacent primary minima (usually called formal periods) lie in the range 30-150 days (these are the periods appearing in the Catalogue). Two subtypes, RVA and RVB, are recognized: RVA RV Tauri variables that do not vary in mean magnitude (AC Her); RVB RV Tauri variables that periodically (with periods from 600 to 1500 days and amplitudes up to 2 mag in V) vary in mean magnitude (DF Cyg, RV Tau). |