i Cancri
catalogues and names
catalogues and names | i Cnc, NSV 04238, 48 Cnc, HR 3475, HD 74739, SAO 80416, BD +29 1824, FK5: 328, WDS 08467+2846A |
constellation | Cancer |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
position (J2000) | RA: 8h 46min 41,8sec | DEC: +28° 45' 36'' | ||
position (2001,21) | RA: 8h 46min 46sec | DEC: +28° 45' 20'' | ||
position (B1900) | RA: 8h 40min 38,8sec | DEC: +29° 7' 33'' | ||
proper motion (J2000) | RA: -0,025 arcsec/a | DEC: -0,042 arcsec/a | ||
radial velocity | 16 km/s | |||
rotational velocity | <19 km/s | |||
trigonometric parallax | 0,017 arcsec | |||
galactic coordinates | longitude: 195,88° | latitude: 36,54° |
note (category: dynamical parallaxes): | 0.023". |
magnitude
visual magnitude | 4,02 (V on UBV Johnson system) |
spectral / color information
spectral class | G7.5IIIaBa0.1 |
B-V-magnitude | 1,01 |
U-B-magnitude | 0,78 |
R-I-magnitude | |
IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
note (category: spectra): | Also classified G8II. |
variability information
variable star identification | 4238 |
note (category: variability): | Probably NSV 4238. |
double/multiple star system information
separation | 30,4 arcsec |
mag difference (of double or brightest multiple) | 2,5 |
note (category: double and multiple data): | Binary with HR 3474. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 8h 46min 41,813sec | DEC: +28° 45' 35,68'' | ±0,06 arcsec | source: 15 |
position (2001,21) | RA: 8h 46min 46sec | DEC: +28° 45' 20'' | JD: 2451987,35 | |
proper motion (J2000) | RA: -0,0019 arcsec/a | DEC: -0,042 arcsec/a | source: 25 | |
radial velocity | 16 km/s | source: 25 | ||
trigonometric parallax | 0,017 arcsec | ±0,002 arcsec | source: 25 | |
galactic coord. (B1950) | longitude: 195,89° | latitude: 36,54° |
magnitude:
visual | 4,02 (observed) | source: 25 |
photovisual | 4,2 | source: 2 |
spectral information:
spectral class | G5 | source: 96 | |
Morgan-Keenan | G8II-III | source: 25 | |
B-magnitude | 5,03 ±0,05 | B-V-magnitude | 1,01 |
U-magnitude | 5,81 ±0,05 | U-B-magnitude | 0,78 |
double/multiple star system information:
separation between brightest and second brightest component | 30,4 arcsec |
magnitude difference between brightest and second brightest component | 2,55 |
position angle | 307 ° |
component | magnitude | spectral class | catalogue(s)/name(s) |
A | 4,02 | G5 | i Cancri, 48 Cnc, HR 3475, HD 74739, SAO 80416 |
B | 6,57 | A5 | i Cancri, 48 Cnc, HR 3474, HD 74738, SAO 80415 |
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 | |
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: 8h 43min 40,514sec | DEC: +28° 56' 39,19'' | ±0,004 arcsec |
position (2001,21) | RA: 8h 46min 47sec | DEC: +28° 45' 22'' | JD: 2451987,35 |
position (J2000) | RA: 8h 46min 41,817sec | DEC: +28° 45' 35,76'' | |
proper motion B1950 (FK4) | RA: -0,0018 arcsec/a | DEC: -0,045 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: -0,0019 arcsec/a | DEC: -0,041 arcsec/a | |
source of proper motion data | Determined by source catalog |
magnitude:
visual | 4,2 (accuracy: 2 decimals) |
source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
spectral class | G5 |
source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
source catalogue | FK4, catalogue number: 328 |
Durchmusterung | BD+29 1824 |
Boss General Catalogue | 12083 |
Henry Draper Catalogue | 74739 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
position (J2000) | RA: 8h 46,7min | DEC: +28° 46' |
proper motion (J2000) | RA: -0,025 arcsec/a | DEC: -0,042 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 |
- | 1828 | 49 | 307° | 30,4'' | 4,03 | 6,58 | G7.5IIIa | STF1268 |
discoverer information:
discoverer code | discoverer | reference |
STF1268 | Struve, F.G.W. | - |
notes:
note | Iota Cnc. B is CD-29@1823. Proper motion of B -017 -043, spectral type A3V. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
position (equinox 1950.0) | RA: 8h 43min 40,5sec | DEC: +28° 56' 39'' |
variability informations:
variability type | - |
magnitute at min. brightness | |
photometric system | visual, photovisual or Johnson's V |
spectral information
spectral class | * |
references
to a study | 0132D (designation: 1268) |
miscanellous
There are notes in the published catalog (Kukarkin et al.(1982)). |