i Cancri
catalogues and names
| catalogues and names | i Cnc, 48 Cnc, HR 3474, HD 74738, SAO 80415, BD +29 1823, WDS 08467+2846B |
| constellation | Cancer |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 8h 46min 40sec | DEC: +28° 45' 55'' | ||
| position (2001,21) | RA: 8h 46min 44sec | DEC: +28° 45' 39'' | ||
| position (B1900) | RA: 8h 40min 36,9sec | DEC: +29° 7' 51'' | ||
| proper motion (J2000) | RA: -0,018 arcsec/a | DEC: -0,041 arcsec/a | ||
| radial velocity | 15 km/s | |||
| rotational velocity | 200 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0,017 arcsec | |||
| galactic coordinates | longitude: 195,87° | latitude: 36,54° | ||
| note (category: dynamical parallaxes): | 0.023". |
magnitude
| visual magnitude | 6,57 (V on UBV Johnson system) |
spectral / color information
| spectral class | A3V |
| B-V-magnitude | 0,04 |
| U-B-magnitude | 0,04 |
| IR-note | object is infrared source (uncertain identification) |
variability information
| variable star identification | 4238 |
| note (category: variability): | The magnitude difference between HR 3474 and 3475 appears to vary. |
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 3475. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 8h 46min 39,965sec | DEC: +28° 45' 53,57'' | ±0,35 arcsec | source: 17 |
| position (2001,21) | RA: 8h 46min 44sec | DEC: +28° 45' 38'' | JD: 2451987,35 | |
| proper motion (J2000) | RA: -0,0023 arcsec/a | DEC: -0,051 arcsec/a | source: 25 | |
| radial velocity | 15 km/s | source: 25 | ||
| trigonometric parallax | 0,017 arcsec | ±0,002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 195,88° | latitude: 36,54° | ||
magnitude:
| visual | 6,57 (observed) | source: 25 |
| photovisual | 6,6 | source: 2 |
| photographic | 6,7 | source: 16 |
spectral information:
| spectral class | A5 | source: 96 | |
| Morgan-Keenan | A3V | source: 25 | |
| B-magnitude | 6,61 ±0,05 | B-V-magnitude | 0,04 |
| U-magnitude | 6,65 ±0,05 | U-B-magnitude | 0,04 |
double/multiple star system information:
| separation between brightest and second brightest component | 30,4 arcsec |
| magnitude difference between brightest and second brightest component | 2,5 |
| 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 | |
| 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 | |
| 17 | ACRS |
| Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 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: 8h 43min 38,685sec | DEC: +28° 56' 57,95'' | ±0,038 arcsec |
| position (2001,21) | RA: 8h 46min 45sec | DEC: +28° 45' 41'' | JD: 2451987,35 |
| position (J2000) | RA: 8h 46min 40,022sec | DEC: +28° 45' 54,67'' | |
| proper motion B1950 (FK4) | RA: -0,0013 arcsec/a | DEC: -0,044 arcsec/a | ±0,007 arcsec/a in RA ±0,007 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0014 arcsec/a | DEC: -0,04 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 6,6 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | A5 |
| 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: 12080 |
| Durchmusterung | BD+29 1823 |
| Boss General Catalogue | 12080 |
| Henry Draper Catalogue | 74738 |
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. |