EN Aquarii
catalogues and names
| catalogues and names | EN Aqr, 3 Aqr, HR 7951, HD 198026, SAO 144814, BD -5 5378, FK5: 1543 |
| constellation | Aquarius |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 20h 47min 44.2sec | DEC: -5° 1' 40'' | ||
| position (B1900) | RA: 20h 42min 27.7sec | DEC: -5° 23' 38'' | ||
| proper motion (J2000) | RA: 0.003 arcsec/a | DEC: -0.04 arcsec/a | ||
| radial velocity | -22 km/s note: suspected variable radial velocity |
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| trigonometric parallax | 0.008 arcsec | |||
| galactic coordinates | longitude: 42.24° | latitude: -28.09° | ||
magnitude
| visual magnitude | 4.42 (V on UBV Johnson system) |
spectral / color information
| spectral class | M3III |
| B-V-magnitude | 1.65 |
| U-B-magnitude | 1.92 |
| R-I-magnitude | |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
variability information
| variable star identification | EN Aqr |
| note (category: variability): | Lb 4.41 - 4.45V. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 20h 47min 44.243sec | DEC: -5° 1' 39.75'' | ±0.06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0.0002 arcsec/a | DEC: -0.04 arcsec/a | source: 25 | |
| radial velocity | -22 km/s | source: 25 | ||
| trigonometric parallax | 0.008 arcsec | ±0.001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 42.25° | latitude: -28.09° | ||
magnitude:
| visual | 4.42 (observed) | source: 25 |
| photovisual | 4.6 | source: 2 |
| photographic | 6 | source: 2 |
spectral information:
| spectral class | M0 | source: 96 | |
| Morgan-Keenan | M3III | source: 25 | |
| B-magnitude | 6.07 ±0.05 | B-V-magnitude | 1.65 |
| U-magnitude | 7.99 ±0.05 | U-B-magnitude | 1.92 |
variability information:
| variability type | 171 |
| var. amplitude | 0.04 |
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 | |
| 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 | |
| 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: 20h 45min 5.974sec | DEC: -5° 12' 43.27'' | ±0.006 arcsec |
| position (J2000) | RA: 20h 47min 44.239sec | DEC: -5° 1' 39.74'' | |
| proper motion B1950 (FK4) | RA: -0.0001 arcsec/a | DEC: -0.037 arcsec/a | ±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0001 arcsec/a | DEC: -0.039 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.6 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | M0 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 1543 |
| Durchmusterung | BD-05 5378 |
| Boss General Catalogue | 28979 |
| Henry Draper Catalogue | 198026 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 20h 45min 6sec | DEC: -5° 12' 43'' |
variability informations:
| variability type | LB | pulsating variable star |
| magnitute at max. brightness | 4.41 | |
| magnitute at min. brightness | 4.45 | |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | M3III |
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 | 4/157 |
| constellation | Aquarius |
| notes on existence | The star is equivalent to '0040158 EO'. |
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). |