Gorgonea Tertia
| catalogues and names | Gorgonea Tertia, r Per, rho Per, 25 Per, HR 921, HD 19058, SAO 56138, FK5: 109 |
| constellation | Perseus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | Gorgonea Tertia. |
position, motion, parallax:
| position (J2000) | RA: 3h 5min 10,6sec | DEC: +38° 50' 25'' |
| position (J1900) | RA: 2h 58min 45,9sec | DEC: +38° 27' 10'' |
| proper motion (J2000) | RA: 0,13 arcsec/a | DEC: -0,106 arcsec/a |
| radial velocity | 28 km/s | |
| trigonometric parallax | 0,011 arcsec | |
magnitude
| visual magnitude | 3,39 (V on UBV Johnson system) |
spectral / color information
| spectral class | M4II |
| B-V-magnitude | 1,65 |
| U-B-magnitude | 1,79 |
| R-I-magnitude | 1,62 |
variability information
| variable star identification | Rho Per |
| note (category: variability): | SRb 3.30 - 4.0V, about 50d with possibly slow var. in mean brightness in 1100d period. |
miscellaneous information
| note (category: group membership): | Zeta Her group. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 3h 5min 10,593sec | DEC: +38° 50' 25,01'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0,0111 arcsec/a | DEC: -0,106 arcsec/a | source: 25 | |
| radial velocity | 28 km/s | source: 25 | ||
| trigonometric parallax | 0,011 | ±0,001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 149,6° | latitude: -17,01° | ||
| GCI unit vector (J2000) | X: 0,538184 | Y: 0,563062 | Z: 0,627152 | |
magnitude:
| visual | 3,3 (observed) | source: 31 |
spectral information:
| spectral class | M0 | source: 96 | |
| Morgan-Keenan | M4II | source: 25 | |
| B-magnitude | 5,04 ±0,05 | B-V-magnitude | 1,65 |
| U-magnitude | 6,83 ±0,05 | U-B-magnitude | 1,79 |
variability information:
| variability type | 194 |
| var. amplitude | 0,7 |
| var. period | 50 |
sources:
| 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 | |
| 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 (J1950) | RA: 3h 1min 57,795sec | DEC: +38° 38' 52,86'' | ±0,005 arcsec |
| position (J2000) | RA: 3h 5min 10,592sec | DEC: +38° 50' 25,02'' | |
| proper motion J1950 (FK4) | RA: 0,0111 arcsec/a | DEC: -0,102 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0111 arcsec/a | DEC: -0,105 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3,7 (accuracy: 2 decimals) |
| source of visual magnitude data | Arithmetic mean of maximum and minimum magnitudes of a variable star |
spectral information:
| spectral class | M3 |
| 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 | FK4, catalogue number: 109 |
| Durchmusterung | BD+38 630 |
| Boss General Catalogue | 3682 |
| Henry Draper Catalogue | 19058 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (J1950) | RA: 3h 1min 57,8sec | DEC: +38° 38' 53'' |
variability informations:
| variability type | SRB | pulsating variable star |
| magnitute at max. brightness | 3,3 | |
| magnitute at min. brightness | 4 | |
| photometric system | visual, photovisual or Johnson's V | |
| period [d] | 50 (uncertain) |
spectral information
| spectral class | M4IIb-IIIa |
references
| to a chart/photograph | Vol. I GCVS (see Kholopov et al. 1985-1988) |
miscanellous
| ID in the GCVS catalogue | 63/9017 |
| constellation | Perseus |
| notes on existence | The star is equivalent to '0639019 tau'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| SRB | Semiregular variables, which are giants or supergiants of intermediate and late spectral types showing noticeable periodicity in their light changes, accompanied or sometimes interrupted by various irregularities. Periods lie in the range from 20 to >2000 days, while the shapes of the light curves are rather different and variable, and the amplitudes may be from several hundredths to several magnitudes (usually 1-2 mag in V). SRA Semiregular late-type (M, C, S or Me, Ce, Se) giants displaying persistent periodicity and usually small (<2.5 mag in V) light amplitudes (Z Aqr). Amplitudes and light-curve shapes generally vary and periods are in the range of 35-1200 days. Many of these stars differ from Miras only by showing smaller light amplitudes; SRB Semiregular late-type (M, C, S or Me, Ce, Se) giants with poorly defined periodicity (mean cycles in the range of 20 to 2300 days) or with alternating intervals of periodic and slow irregular changes, and even with light constancy intervals (RR CrB, AF Cyg). Every star of this type may usually be assigned a certain mean period (cycle), which is the value given in the Catalogue. In a number of cases, the simultaneous presence of two or more periods of light variation is observed; SRC Semiregular late-type (M, C, S or Me, Ce, Se) supergiants (Mu Cep) with amplitudes of about 1 mag and periods of light variation from 30 days to several thousand days; SRD Semiregular variable giants and supergiants of F, G, or K spectral types, sometimes with emission lines in their spectra. Amplitudes of light variation are in the range from 0.1 to 4 mag, and the range of periods is from 30 to 1100 days (SX Her, SV UMa). |