g Herculis


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 (Vol. I-III)


catalogues and names g Her, gam Her, 20 Her, HR 6095, HD 147547, SAO 102107, FK5: 609, WDS 16219+1909A
constellation Hercules

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


object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

position, motion, parallax:

position (J2000) RA: 16h 21min 55,2sec DEC: +19 9' 11''
position (J1900) RA: 16h 17min 30,4sec DEC: +19 23' 16''
proper motion (J2000) RA: -0,047 arcsec/a DEC: 0,043 arcsec/a
radial velocity -35 km/s
note: spectroscopic binaries
rotational velocity 141 km/s (uncertain) (variable)
trigonometric parallax 0,024 arcsec

magnitude

visual magnitude 3,75
(V on UBV Johnson system)

spectral / color information

spectral class A9III
B-V-magnitude 0,27
U-B-magnitude 0,18
R-I-magnitude 0,14

variability information

variable star identification 7667

double/multiple star system information

number of components of multiple star system 3
separation 41,6 arcsec
mag difference (of double or brightest multiple) 6,4
component ID AB
note (category: double and multiple data): ADS 10022B, 9.58v, optical.
note (category: spectroscopic binaries): 11.9d.

miscellaneous information

note (category: group membership): Hyades group.

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

position, motion, parallax:

position (J2000) RA: 16h 21min 55,216sec DEC: +19 9' 11,2'' 0,06 arcsec source: 15
proper motion (J2000) RA: -0,0033 arcsec/a DEC: 0,043 arcsec/a source: 25
radial velocity -35 km/s source: 25
trigonometric parallax 0,024 0,002 arcsec source: 25
galactic coord. (B1950) longitude: 35,26 latitude: 41,3
GCI unit vector (J2000) X: -0,392037 Y: -0,859454 Z: 0,328094

magnitude:

visual 3,75 (observed) source: 25
photovisual 3,8 source: 2

spectral information:

spectral class F0 source: 96
Morgan-Keenan A9III source: 25
B-magnitude 4,02 0,05 B-V-magnitude 0,27
U-magnitude 4,2 0,05 U-B-magnitude 0,18

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 41,6 arcsec
magnitude difference between brightest and second brightest component 5,83
position angle 233

component magnitude spectral class catalogue(s)/name(s)
A 3,75 F0 g Herculis, 20 Her, HR 6095, HD 147547, SAO 102107
B 9,59 -

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 19min 42,737sec DEC: +19 16' 9,32'' 0,004 arcsec
position (J2000) RA: 16h 21min 55,217sec DEC: +19 9' 11,33''
proper motion J1950 (FK4) RA: -0,0033 arcsec/a DEC: 0,042 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0033 arcsec/a DEC: 0,045 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 3,8 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class F0
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 609
Durchmusterung BD+19 3086
Boss General Catalogue 22012
Henry Draper Catalogue 147547

data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

position and proper motion:

position (J2000) RA: 16h 21,9min DEC: +19 9'
proper motion (J2000) RA: -0,047 arcsec/a DEC: 0,043 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 1821 29 244 38,3'' 3,75 9,58 A9III SHJ 227
1938 233 41,6''
BC 1910 1 298 84,7'' 9,8 12,2 - SHJ 227

discoverer information:

discoverer code discoverer reference
SHJ 227 South & Herschel -

notes:

note Gamma Her. A is a spectroscopic binary. B is BD+19@2085. Proper motion of B -035 -041.

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)

position:

position (J1950) RA: 16h 19min 42,7sec DEC: +19 16' 9''

variability informations:

variability type SRD: pulsating variable star
magnitute at max. brightness 4,02
magnitute amplitude 0,09
photometric system

references

to a study G.A.Bakos, J.Tremko, Skalnate Pleso Contr 21, 7, 1991.
to a chart/photograph no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'

miscanellous

ID in the GCVS catalogue 40/9003
constellation Hercules
notes on existence The star is equivalent to '71247'.

variability type description

variability type description
SRD Semiregular variables, which are giants or supergiants of intermediate and late spectral types showing noticeable periodicity in their light changes, accompanied or sometimes interrupted by various irregularities. Periods lie in the range from 20 to >2000 days, while the shapes of the light curves are rather different and variable, and the amplitudes may be from several hundredths to several magnitudes (usually 1-2 mag in V).

SRA
Semiregular late-type (M, C, S or Me, Ce, Se) giants displaying persistent periodicity and usually small (<2.5 mag in V) light amplitudes (Z Aqr). Amplitudes and light-curve shapes generally vary and periods are in the range of 35-1200 days. Many of these stars differ from Miras only by showing smaller light amplitudes;

SRB
Semiregular late-type (M, C, S or Me, Ce, Se) giants with poorly defined periodicity (mean cycles in the range of 20 to 2300 days) or with alternating intervals of periodic and slow irregular changes, and even with light constancy intervals (RR CrB, AF Cyg). Every star of this type may usually be assigned a certain mean period (cycle), which is the value given in the Catalogue. In a number of cases, the simultaneous presence of two or more periods of light variation is observed;

SRC
Semiregular late-type (M, C, S or Me, Ce, Se) supergiants (Mu Cep) with amplitudes of about 1 mag and periods of light variation from 30 days to several thousand days;

SRD
Semiregular variable giants and supergiants of F, G, or K spectral types, sometimes with emission lines in their spectra. Amplitudes of light variation are in the range from 0.1 to 4 mag, and the range of periods is from 30 to 1100 days (SX Her, SV UMa).