Gianfar
catalogues and names
catalogues and names | Gianfar, l Dra, NSV 05231, 1 Dra, HR 4434, HD 100029, SAO 15532, BD +70 665, FK5: 433 |
other names | Giansar, Gaiusar, Giauzar, Juza |
constellation | Draco |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
note (category: star names): | Gianfar; Giansar; Gaiusar; Giauzar; Juza. |
position, motion, parallax:
position (J2000) | RA: 11h 31min 24.2sec | DEC: +69° 19' 52'' | ||
position (B1900) | RA: 11h 25min 28.3sec | DEC: +69° 52' 59'' | ||
proper motion (J2000) | RA: -0.039 arcsec/a | DEC: -0.017 arcsec/a | ||
radial velocity | 7 km/s | |||
trigonometric parallax | 0.026 arcsec | |||
galactic coordinates | longitude: 132.98° | latitude: 46.2° |
magnitude
visual magnitude | 3.84 (V on UBV Johnson system) |
spectral / color information
spectral class | M0IIICa-1 |
B-V-magnitude | 1.62 |
U-B-magnitude | 1.97 |
R-I-magnitude | |
IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
variability information
variable star identification | 5231 |
note (category: variability): | SR, 3.78 - 3.86V, about 1100d. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 11h 31min 24.248sec | DEC: +69° 19' 51.87'' | ±0.06 arcsec | source: 15 |
proper motion (J2000) | RA: -0.0073 arcsec/a | DEC: -0.017 arcsec/a | source: 25 | |
radial velocity | 7 km/s | source: 25 | ||
trigonometric parallax | 0.026 arcsec | ±0.003 arcsec | source: 25 | |
galactic coord. (B1950) | longitude: 132.98° | latitude: 46.2° |
magnitude:
visual | 3.84 (observed) | source: 25 |
photovisual | 4.1 | source: 2 |
spectral information:
spectral class | M0 | source: 96 | |
Morgan-Keenan | M0IIICa-1 | source: 25 | |
B-magnitude | 5.46 ±0.05 | B-V-magnitude | 1.62 |
U-magnitude | 7.43 ±0.05 | U-B-magnitude | 1.97 |
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 | |
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: 11h 28min 27.546sec | DEC: +69° 36' 26.09'' | ±0.004 arcsec |
position (J2000) | RA: 11h 31min 24.274sec | DEC: +69° 19' 51.92'' | |
proper motion B1950 (FK4) | RA: -0.0074 arcsec/a | DEC: -0.02 arcsec/a | ±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: -0.007 arcsec/a | DEC: -0.017 arcsec/a | |
source of proper motion data | Determined by source catalog |
magnitude:
visual | 4.1 (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: 433 |
Durchmusterung | BD+70 665 |
Boss General Catalogue | 15799 |
Henry Draper Catalogue | 100029 |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
position (equinox 1950.0) | RA: 11h 28min 27.5sec | DEC: +69° 36' 26'' |
variability informations:
variability type | SR | pulsating variable star |
magnitute at max. brightness | 3.78 | |
magnitute at min. brightness | 3.86 | |
photometric system | visual, photovisual or Johnson's V |
spectral information
spectral class | M0 |
references
to a study | 290477D (designation: ZI 888) |
miscanellous
There are notes in the published catalog (Kukarkin et al.(1982)). |
variability type description
variability type | description |
SR |
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). |