i Arae
catalogues and names
| catalogues and names | i Ara, iot Ara, HR 6451, HD 157042, SAO 227886, CD -47 11484 A, FK5: 3379, WDS 17233-4728 |
| constellation | Ara |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 17h 23min 16.1sec | DEC: -47° 28' 6'' | ||
| position (B1900) | RA: 17h 15min 45.6sec | DEC: -47° 22' 11'' | ||
| proper motion (J2000) | RA: -0.01 arcsec/a | DEC: -0.024 arcsec/a | ||
| radial velocity | -19 km/s | |||
| rotational velocity | 369 km/s (uncertain) (variable) | |||
| galactic coordinates | longitude: 342.01° | latitude: -6.33° | ||
magnitude
| visual magnitude | 5.25 (V on UBV Johnson system) |
spectral / color information
| spectral class | B2IIIne |
| B-V-magnitude | -0.11 |
| U-B-magnitude | -0.82 |
| R-I-magnitude |
| note (category: spectra): | H alpha profile varies. |
variability information
| variable star identification | Iot Ara |
| note (category: variability): | Gamma Cas? 5.22 - 5.25V on time scale of fraction of a day. |
double/multiple star system information
| separation | 42.8 arcsec |
| mag difference (of double or brightest multiple) | 5.3 |
| note | Worley (1978) update of the IDS |
| note (category: double and multiple data): | Companion G5III, optical. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 17h 23min 16.106sec | DEC: -47° 28' 5.55'' | ±0.19 arcsec | source: 16 |
| proper motion (J2000) | RA: -0.0001 arcsec/a | DEC: -0.02 arcsec/a | source: 25 | |
| radial velocity | -19 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 342.02° | latitude: -6.33° | ||
magnitude:
| visual | 5.25 (observed) | source: 25 |
| photovisual | 5.3 | source: 16 |
spectral information:
| spectral class | B3 | source: 96 | |
| Morgan-Keenan | B2IIIne | source: 25 | |
| B-magnitude | 5.14 ±0.05 | B-V-magnitude | -0.11 |
| U-magnitude | 4.32 ±0.05 | U-B-magnitude | -0.82 |
variability information:
| variability type | 264 |
| var. amplitude | 0.03 |
double/multiple star system information:
| separation between brightest and second brightest component | 42.8 arcsec |
| magnitude difference between brightest and second brightest component | 5.3 |
| position angle | 62 ° |
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 | |
| 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: 17h 19min 30.584sec | DEC: -47° 25' 16.27'' | ±0.032 arcsec |
| position (J2000) | RA: 17h 23min 16.077sec | DEC: -47° 28' 5.18'' | |
| proper motion B1950 (FK4) | RA: -0.0008 arcsec/a | DEC: -0.015 arcsec/a | ±0.008 arcsec/a in RA ±0.005 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0009 arcsec/a | DEC: -0.016 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5.5 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | B3p |
| 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: 23470 |
| Durchmusterung | CD-4711484A |
| Boss General Catalogue | 23470 |
| Henry Draper Catalogue | 157042 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 17h 23.3min | DEC: -47° 28' |
| proper motion (J2000) | RA: -0.01 arcsec/a | DEC: -0.024 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 |
| - | 1900 | 1 | 62° | 42.8'' | 5.5 | 10.8 | B2IIIne | HDO 271 |
discoverer information:
| discoverer code | discoverer | reference |
| HDO 271 | - | - |
notes:
| note | Iota Ara. A is variable. |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 17h 19min 30.6sec | DEC: -47° 25' 16'' |
variability informations:
| variability type | GCAS | eruptive variable star |
| magnitute at max. brightness | 5.18 | |
| magnitute at min. brightness | 5.26 | |
| photometric system | visual, photovisual or Johnson's V |
references
| to a study | C.Waelkens, F.Rufener, M.Burnet, Hvar Bull 7,No.1,125,1983. |
| to a chart/photograph | D.K.Bedford, K.H.Elliott, B.Ramsey, J.Meaburn, MN 210,No.3,693,1984. |
miscanellous
| ID in the GCVS catalogue | 6/9009 |
| constellation | Ara |
| notes on existence | The star is equivalent to '68384'. |
variability type description
| variability type | description |
| GCAS | Eruptive irregular variables of the Gamma Cas type. These are rapidly rotating B III-IVe stars with mass outflow from their equatorial zones. The formation of equatorial rings or disks is often accompanied by temporary fading. Light amplitudes may reach 1.5 mag in V. |