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. Combined General Catalogue of Variable Stars (suspected variables)

catalogues and names Kuma, n2Dra, NSV 09164, 25 Dra, HR 6555, HD 159560, SAO 30450, FK5: 657, WDS 17323+5510A
constellation Draco

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

note (category: star names): Kuma.

position, motion, parallax:

position (J2000) RA: 17h 32min 16sec DEC: +55 10' 23''
position (J1900) RA: 17h 30min 17,7sec DEC: +55 14' 28''
proper motion (J2000) RA: 0,148 arcsec/a DEC: 0,056 arcsec/a
radial velocity -16 km/s
note: spectroscopic binaries
note: orbital data avaible
rotational velocity 50 km/s (uncertain) (variable)
trigonometric parallax 0,035 arcsec


visual magnitude 4,87
(V on UBV Johnson system)

spectral / color information

spectral class A4m
B-V-magnitude 0,28
U-B-magnitude 0,06
R-I-magnitude 0,13
note (category: spectra): Also classified F0IVms (variable spectrum) and Am(A4/F2V/F3).

variability information

variable star identification 9164
note (category: variability): ADS 10628A, I?, 4.83 - 4.95V.

double/multiple star system information

separation 62,3 arcsec
mag difference (of double or brightest multiple) 0
note (category: double and multiple data): Binary with HR 6554.
note (category: spectroscopic binaries): 38.5958d, K 12.4k/s, V0 -16.9k/s, asini 6.34.

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

position, motion, parallax:

position (J2000) RA: 17h 32min 16,017sec DEC: +55 10' 22,6'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,0173 arcsec/a DEC: 0,056 arcsec/a source: 25
radial velocity -16 km/s source: 25
trigonometric parallax 0,035 0,003 arcsec source: 25
galactic coord. (B1950) longitude: 83,02 latitude: 33,12
GCI unit vector (J2000) X: -0,06894 Y: -0,566925 Z: 0,82088


visual 4,87 (observed) source: 25
photovisual 5 source: 2
photographic 4,9 source: 16

spectral information:

spectral class A5 source: 96
Morgan-Keenan A4m source: 25
B-magnitude 5,15 0,05 B-V-magnitude 0,28
U-magnitude 5,21 0,05 U-B-magnitude 0,06

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 61,9 arcsec
magnitude difference between brightest and second brightest component 0,01
position angle 312

component magnitude spectral class catalogue(s)/name(s)
A 4,87 A5 Kuma, n2Draconis, 25 Dra, HR 6555, HD 159560, SAO 30450
B 4,88 A5 n1Draconis, 24 Dra, HR 6554, HD 159541, SAO 30447


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
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
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: 17h 31min 16,719sec DEC: +55 12' 22,82'' 0,005 arcsec
position (J2000) RA: 17h 32min 16,01sec DEC: +55 10' 22,59''
proper motion J1950 (FK4) RA: 0,0165 arcsec/a DEC: 0,054 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0172 arcsec/a DEC: 0,057 arcsec/a
source of proper motion data Determined by source catalog


visual 5 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class A5
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.


source catalogue FK4, catalogue number: 657
Durchmusterung BD+55 1945
Boss General Catalogue 23801
Henry Draper Catalogue 159560

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


position (J1950) RA: 17h 31min 16,7sec DEC: +55 12' 23''

variability informations:

variability type I: eruptive variable star
magnitute at max. brightness 4,83
magnitute at min. brightness 4,95
photometric system visual, photovisual or Johnson's V

spectral information

spectral class AM


to a study 742754D (designation: *)


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

variability type description

variability type description
Poorly studied irregular variables with unknown features of light variations and spectral types. This is a very inhomogeneous group of objects.