Alkes
catalogues and names | Alkes, a Crt, 7 Crt, HR 4287, HD 95272, SAO 156375, FK5: 1283 |
constellation | Crater |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
note (category: star names): | Alkes. |
position, motion, parallax:
position (J2000) | RA: 10h 59min 46,5sec | DEC: -18° 17' 56'' |
position (J1900) | RA: 10h 54min 54,1sec | DEC: -17° 45' 58'' |
proper motion (J2000) | RA: -0,46 arcsec/a | DEC: 0,13 arcsec/a |
radial velocity | 47 km/s note: variable radial velocity |
|
rotational velocity | <19 km/s | |
trigonometric parallax | 0,031 arcsec |
magnitude
visual magnitude | 4,08 (V on UBV Johnson system) |
spectral / color information
spectral class | K0+III |
B-V-magnitude | 1,09 |
U-B-magnitude | 1 |
R-I-magnitude | 0,55 |
miscellaneous information
note (category: group membership): | 61 Cyg group. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 10h 59min 46,47sec | DEC: -18° 17' 55,65'' | ±0,06 arcsec | source: 15 |
proper motion (J2000) | RA: -0,0323 arcsec/a | DEC: 0,13 arcsec/a | source: 25 | |
radial velocity | 47 km/s | source: 25 | ||
trigonometric parallax | 0,031 | ±0,003 arcsec | source: 25 | |
galactic coord. (B1950) | longitude: 269,07° | latitude: 37,12° | ||
GCI unit vector (J2000) | X: -0,916839 | Y: 0,246633 | Z: -0,313972 |
magnitude:
visual | 4,08 (observed) | source: 25 |
photovisual | 4,2 | source: 2 |
photographic | 5,2 | source: 2 |
spectral information:
spectral class | K0 | source: 96 | |
Morgan-Keenan | K0+III | source: 25 | |
B-magnitude | 5,17 ±0,05 | B-V-magnitude | 1,09 |
U-magnitude | 6,17 ±0,05 | U-B-magnitude | 1 |
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 (J1950) | RA: 10h 57min 20,138sec | DEC: -18° 1' 55,62'' | ±0,006 arcsec |
position (J2000) | RA: 10h 59min 46,465sec | DEC: -18° 17' 55,66'' | |
proper motion J1950 (FK4) | RA: -0,0326 arcsec/a | DEC: 0,124 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: -0,0324 arcsec/a | DEC: 0,13 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 | K0 |
source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
source catalogue | FK4, catalogue number: 1283 |
Durchmusterung | BD-17 3273 |
Boss General Catalogue | 15106 |
Henry Draper Catalogue | 95272 |