o Draconis


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 o Dra, omi Dra, 47 Dra, HR 7125, HD 175306, SAO 31218, FK5: 707, WDS 18512+5923A
constellation Draco

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: 18h 51min 12,1sec DEC: +59 23' 18''
position (J1900) RA: 18h 49min 43,5sec DEC: +59 15' 58''
proper motion (J2000) RA: 0,079 arcsec/a DEC: 0,027 arcsec/a
radial velocity -20 km/s
note: spectroscopic binaries, single lined spectra
note: orbital data avaible
rotational velocity 20 km/s (uncertain) (variable)
trigonometric parallax 0,006 arcsec

magnitude

visual magnitude 4,66
(V on UBV Johnson system)

spectral / color information

spectral class G9IIIFe-0.5
B-V-magnitude 1,19
U-B-magnitude 1,04
R-I-magnitude 0,64

variability information

variable star identification Omi Dra

double/multiple star system information

number of components of multiple star system 3
separation 34,6 arcsec
mag difference (of double or brightest multiple) 3,4
component ID AB
note (category: double and multiple data): B is K3IIIp optical, vsini =<54k/s. C, 11.5v at 139" is receding from A.
note (category: spectroscopic binaries): ADS 11799A, 138.420d, K 23.5k/s, V0 -19.5k/s, asini 44.5. Companion possibly early type.

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

position, motion, parallax:

position (J2000) RA: 18h 51min 12,083sec DEC: +59 23' 18,13'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,0104 arcsec/a DEC: 0,027 arcsec/a source: 25
radial velocity -20 km/s source: 25
trigonometric parallax 0,006 0,001 arcsec source: 25
galactic coord. (B1950) longitude: 89,31 latitude: 23,14
GCI unit vector (J2000) X: 0,112819 Y: -0,496561 Z: 0,860639

magnitude:

visual 4,66 (observed) source: 25
photovisual 4,8 source: 2

spectral information:

spectral class K0 source: 29
Morgan-Keenan G9IIIFe-0.5 source: 25
B-magnitude 5,85 0,05 B-V-magnitude 1,19
U-magnitude 6,89 0,05 U-B-magnitude 1,04

variability information:

source of data: 27
variability type 273
var. amplitude 0,1

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 34,6 arcsec
magnitude difference between brightest and second brightest component 3,2
position angle 324

component magnitude spectral class catalogue(s)/name(s)
A 4,66 K0 o Draconis, 47 Dra, HR 7125, HD 175306, SAO 31218
B 8,192 -

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
27 Catalog of Red Magnitudes (CRM)
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 1994
29 SAOJ2000
SAO on FK5 at J2000, 1989

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (J1950) RA: 18h 50min 27,777sec DEC: +59 19' 36,36'' 0,004 arcsec
position (J2000) RA: 18h 51min 12,066sec DEC: +59 23' 18,15''
proper motion J1950 (FK4) RA: 0,0095 arcsec/a DEC: 0,027 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0102 arcsec/a DEC: 0,027 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 4,9 (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: 707
Durchmusterung BD+59 1925A
Boss General Catalogue 25905
Henry Draper Catalogue 175306

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

position and proper motion:

position (J2000) RA: 18h 51,2min DEC: +59 23'
proper motion (J2000) RA: 0,079 arcsec/a DEC: 0,027 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 1832 51 346 30,3'' 4,66 7,9 G7III-IV STF2420
1961 324 34,6''
AC 1880 3 327 107,8'' 4,8 11,5 - STF2420
1960 326 139,4''

discoverer information:

discoverer code discoverer reference
STF2420 Struve, F.G.W. -

notes:

note Omicron Dra. A is a spectroscopic binary. Proper motion of B -016 +020. A is also variable.

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

position:

position (J1950) RA: 18h 50min 27,8sec DEC: +59 19' 36''

variability informations:

variability type RS eruptive variable star
magnitute at max. brightness 4,63
magnitute amplitude 0,1
photometric system visual, photovisual or Johnson's V

references

to a study D.S.Hall, W.T.Persinger, Cool Stars,Stellar Systems,and the Sun (Lecture
Notes in Physics 254),88,1986.
to a chart/photograph no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'

miscanellous

ID in the GCVS catalogue 34/9015
constellation Draco
notes on existence The star is equivalent to '69253'.

variability type description

variability type description
RS Eruptive variables of the RS Canum Venaticorum type. This type is ascribed to close binary systems with spectra showing Ca II H and K in emission, their components having enhanced chromospheric activity that causes quasi-periodic light variability. The period of variation is close to the orbital one, and the variability amplitude is usually as great as 0.2 mag in V (UX Ari). They are X-ray sources and rotating variables. RS CVn itself is also an eclipsing system.