Mirfak


The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

  4. The Washington Visual Double Star Catalog, 1996.0

  5. Combined General Catalogue of Variable Stars (suspected variables)


catalogues and names Mirfak, k Her, NSV 07471, 7 Her, HR 6008, HD 145001, SAO 101951, FK5: 1421, WDS 16081+1703A
other names Marfik, Marsik, Marfak
constellation Hercules

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)

note (category: star names): Marfik; Marsik; Mirfak; Marfak.

position, motion, parallax:

position (J2000) RA: 16h 8min 4,5sec DEC: +17 2' 49''
position (J1900) RA: 16h 3min 33,6sec DEC: +17 18' 48''
proper motion (J2000) RA: -0,032 arcsec/a DEC: -0,007 arcsec/a
radial velocity -11 km/s
note: suspected variable radial velocity
rotational velocity 10 km/s (uncertain) (variable)
trigonometric parallax 0,002 arcsec

magnitude

visual magnitude 5
(V on UBV Johnson system)

spectral / color information

spectral class G8III
B-V-magnitude 0,95
U-B-magnitude 0,61
R-I-magnitude 0,46
note (category: spectra): Also classified G8II, G7III.

variability information

variable star identification 7471

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 6009.

data from SKY2000 - Master Star Catalog (Myers+ 1997)

position, motion, parallax:

position (J2000) RA: 16h 8min 4,534sec DEC: +17 2' 49,03'' 0,06 arcsec source: 15
proper motion (J2000) RA: -0,0022 arcsec/a DEC: -0,007 arcsec/a source: 25
radial velocity -10 km/s source: 25
trigonometric parallax 0,002 - source: 25
galactic coord. (B1950) longitude: 31,02 latitude: 43,64
GCI unit vector (J2000) X: -0,448567 Y: -0,844303 Z: 0,293155

magnitude:

visual 5 (observed) source: 25
photovisual 5,3 source: 2

spectral information:

spectral class G5 source: 96
Morgan-Keenan G8III source: 25
B-magnitude 5,95 0,05 B-V-magnitude 0,95
U-magnitude 6,56 0,05 U-B-magnitude 0,61

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 27,9 arcsec
magnitude difference between brightest and second brightest component 1,25
position angle 13

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
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 (J1950) RA: 16h 5min 48,989sec DEC: +17 10' 43,81'' 0,005 arcsec
position (J2000) RA: 16h 8min 4,54sec DEC: +17 2' 48,92''
proper motion J1950 (FK4) RA: -0,0022 arcsec/a DEC: -0,011 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0021 arcsec/a DEC: -0,008 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 5,3 (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: 1421
Durchmusterung BD+17 2964
Boss General Catalogue 21696
Henry Draper Catalogue 145001

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.

data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)

position:

position (J1950) RA: 16h 5min 49sec DEC: +17 10' 44''

variability informations:

magnitute at max. brightness 4,7
magnitute at min. brightness 5,02
photometric system visual, photovisual or Johnson's V

spectral information

spectral class G8

references

to a study 660820D (designation: BS 6008)

miscanellous

There are notes in the published catalog (Kukarkin et al.(1982)).