R Aquilae
catalogues and names
| catalogues and names | R Aql, HR 7243, HD 177940, SAO 124266, BD +8 3970, WDS 19064+0814A |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 19h 6min 22.2sec | DEC: +8° 13' 48'' | ||
| position (2000.72) | RA: 19h 6min 24sec | DEC: +8° 13' 52'' | ||
| position (B1900) | RA: 19h 1min 33.2sec | DEC: +8° 4' 43'' | ||
| proper motion (J2000) | RA: 0.006 arcsec/a | DEC: -0.071 arcsec/a | ||
| radial velocity | 32 km/s note: variable radial velocity |
|||
| galactic coordinates | longitude: 41.95° | latitude: 0.45° | ||
magnitude
| visual magnitude | 6.09 (V on UBV Johnson system) |
spectral / color information
| spectral class | M7IIIe |
| B-V-magnitude | 1.6 |
| U-B-magnitude | 0.37 |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
| note (category: spectra): | OH and H2O emission. IR spectra show water vapor. OH, H2O and SiO maser. Also classified M5e-M9e. |
variability information
| variable star identification | R Aql |
| note (category: variability): | M 5.5 - 12.0v, 284.2d. Period changes 348.980 - 0.554202n + 0.000552309n2 from JD 2399190. Radio flare detected in this position. |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 180.7 arcsec |
| mag difference (of double or brightest multiple) | 5 |
| component ID | AC |
| note | Worley (1978) update of the IDS |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 19h 6min 22.238sec | DEC: +8° 13' 48.01'' | ±0.2 arcsec | source: 52 |
| position (2000.72) | RA: 19h 6min 24sec | DEC: +8° 13' 52'' | JD: 2451806.35 | |
| proper motion (J2000) | RA: -0.0002 arcsec/a | DEC: -0.074 arcsec/a | source: 25 | |
| radial velocity | 32 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 41.96° | latitude: 0.45° | ||
magnitude:
| visual | 6.09 (observed) | source: 25 |
| photographic | 11.4 | source: 16 |
spectral information:
| spectral class | M0 | source: 96 | |
| Morgan-Keenan | M7IIIe | source: 25 | |
| B-magnitude | 7.69 ±0.05 | B-V-magnitude | 1.6 |
| U-magnitude | 8.06 ±0.05 | U-B-magnitude | 0.37 |
variability information:
| variability type | 180 |
| var. amplitude | 6.5 |
| var. period | 284.2 |
| var. epoch | 2443458 10. November 1977, 12:00:00 UT |
| next max light | 2451984 15. March 2001, 12:00:00 UT |
double/multiple star system information:
| separation between brightest and second brightest component | 180.7 arcsec |
| magnitude difference between brightest and second brightest component | 5.9 |
| position angle | 259 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 6.09 | M0 | HR 7243, HD 177940, SAO 124266 |
| B | 10.07 | G0 |
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 | |
| 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 | |
| 30 | GCVS, 4th edition |
| Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88 | |
| 52 | PPMN-HP subset |
| PPMN Star Catalogue (Reference 16) High-Precision Subset (Code H) | |
| 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 3min 57.671sec | DEC: +8° 9' 10.25'' | ±0.037 arcsec |
| position (2000.72) | RA: 19h 6min 25sec | DEC: +8° 13' 55'' | JD: 2451806.35 |
| position (J2000) | RA: 19h 6min 22.241sec | DEC: +8° 13' 47.87'' | |
| proper motion B1950 (FK4) | RA: 0.0002 arcsec/a | DEC: -0.069 arcsec/a | ±0.006 arcsec/a in RA ±0.006 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0004 arcsec/a | DEC: -0.07 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 | M6e |
| 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: 26297 |
| Durchmusterung | BD+08 3970 |
| Boss General Catalogue | 26297 |
| Henry Draper Catalogue | 177940 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 19h 6.4min | DEC: +8° 14' |
| proper motion (J2000) | RA: 0.005 arcsec/a | DEC: -0.076 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 |
| AB | 1878 | 3 | 295° | 74'' | 4.6 | 11.1 | M7IIIev | BLL 36 |
| 1959 | 297° | 76.6'' | ||||||
| AC | 1877 | 4 | 258° | 180.2'' | 4.6 | 10.5 | - | BLL 36 |
| 1959 | 259° | 180.7'' |
discoverer information:
| discoverer code | discoverer | reference |
| BLL 36 | Ball, R.S. | - |
notes:
| note | A is the Mira-type variable R Aql. Proper motion of B -007 -009. |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 19h 3min 57.7sec | DEC: +8° 9' 10'' |
variability informations:
| variability type | M | pulsating variable star |
| magnitute at max. brightness | 5.5 | |
| magnitute at min. brightness | 12 | |
| photometric system | visual, photovisual or Johnson's V | |
| epoch for maximum light [JD] | 2443458 10. November 1977, 12:00:00 UT |
|
| period [d] | 284.2 | |
| next maximum light [JD] | 2451984 15. March 2001, 12:00:00 UT |
|
| rising time | 42 % of period |
spectral information
| spectral class | M5e-M9e |
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 | 5/1 |
| constellation | Aquila |
| notes on existence | The star is equivalent to '0050002 S'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| M | Mira (Omicron) Ceti-type variables. These are long-period variable giants with characteristic late-type emission spectra (Me, Ce, Se) and light amplitudes from 2.5 to 11 mag in V. Their periodicity is well pronounced, and the periods lie in the range between 80 and 1000 days. Infrared amplitudes are usually less than in the visible and may be <2.5 mag. For example, in the K band they usually do not exceed 0.9 mag. If the amplitudes exceed 1 - 1.5 mag , but it is not certain that the true light amplitude exceeds 2.5 mag, the symbol "M" is followed by a colon, or the star is attributed to the semiregular class with a colon following the symbol for that type (SR). |