k Herculis
catalogues and names
| catalogues and names | k Her, 7 Her, HR 6009, HD 145000, SAO 101952, BD +17 2965, WDS 16081+1703B |
| constellation | Hercules |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 16h 8min 4,9sec | DEC: +17° 3' 16'' | ||
| position (2001,21) | RA: 16h 8min 8sec | DEC: +17° 3' 5'' | ||
| position (B1900) | RA: 16h 3min 34sec | DEC: +17° 19' 17'' | ||
| proper motion (J2000) | RA: -0,031 arcsec/a | DEC: -0,028 arcsec/a | ||
| radial velocity | 38 km/s note: variable radial velocity |
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| rotational velocity | =<25 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0,002 arcsec | |||
| galactic coordinates | longitude: 31,03° | latitude: 43,64° | ||
magnitude
| visual magnitude | 6,25 (V on UBV Johnson system) |
spectral / color information
| spectral class | K1III |
| B-V-magnitude | 1,14 |
| U-B-magnitude | 1,11 |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
| note (category: spectra): | Also classified K0IV, K2II and K2III. |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 28,1 arcsec |
| mag difference (of double or brightest multiple) | 1,2 |
| component ID | AB |
| note (category: double and multiple data): | Optical pair with HR 6008. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 16h 8min 4,924sec | DEC: +17° 3' 15,45'' | ±0,43 arcsec | source: 16 |
| position (2001,21) | RA: 16h 8min 8sec | DEC: +17° 3' 4'' | JD: 2451987,37 | |
| proper motion (J2000) | RA: -0,0019 arcsec/a | DEC: -0,033 arcsec/a | source: 25 | |
| radial velocity | 38 km/s | source: 25 | ||
| trigonometric parallax | 0,002 arcsec | - | source: 25 | |
| galactic coord. (B1950) | longitude: 31,03° | latitude: 43,64° | ||
magnitude:
| visual | 6,25 (observed) | source: 25 |
| photovisual | 6,5 | source: 2 |
| photographic | 7,3 | source: 16 |
spectral information:
| spectral class | G5 | source: 96 | |
| Morgan-Keenan | K1III | source: 25 | |
| B-magnitude | 7,39 ±0,05 | B-V-magnitude | 1,14 |
| U-magnitude | 8,5 ±0,05 | U-B-magnitude | 1,11 |
double/multiple star system information:
| separation between brightest and second brightest component | 28,2 arcsec |
| magnitude difference between brightest and second brightest component | 1,2 |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 5 | G5 | Mirfak, k Herculis, 7 Her, HR 6008, HD 145001, SAO 101951 |
| B | 6,25 | G5 | k Herculis, 7 Her, HR 6009, HD 145000, SAO 101952 |
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 | |
| 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: 16h 5min 49,369sec | DEC: +17° 11' 12'' | ±0,024 arcsec |
| position (2001,21) | RA: 16h 8min 8sec | DEC: +17° 3' 6'' | JD: 2451987,37 |
| position (J2000) | RA: 16h 8min 4,912sec | DEC: +17° 3' 16,14'' | |
| proper motion B1950 (FK4) | RA: -0,0022 arcsec/a | DEC: -0,031 arcsec/a | ±0,004 arcsec/a in RA ±0,003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0021 arcsec/a | DEC: -0,028 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 6,5 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | G5 |
| 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: 21698 |
| Durchmusterung | BD+17 2965 |
| Boss General Catalogue | 21698 |
| Henry Draper Catalogue | 145000 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 16h 8,1min | DEC: +17° 3' |
| proper motion (J2000) | RA: -0,032 arcsec/a | DEC: -0,007 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 |
| AB | 1822 | 88 | 10° | 31,4'' | 5 | 6,25 | G7III | STF2010 |
| 1985 | 13° | 27,9'' | ||||||
| AC | 1912 | 2 | 212° | 62,7'' | 5,3 | 13,6 | - | STF2010 |
discoverer information:
| discoverer code | discoverer | reference |
| STF2010 | Struve, F.G.W. | - |
notes:
| note | Kappa Her. B is BD+17@2965. Proper motion of B -021 -035. Mt. Wilson spectral types G4 and K1. |