Kuma

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 (B1900)	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
galactic coordinates	longitude: 83.02°	latitude: 33.12°

magnitude

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

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 arcsec		±0.003 arcsec	source: 25
galactic coord. (B1950)	longitude: 83.02°	latitude: 33.12°

magnitude:

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

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
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 (B1950)	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 B1950 (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

magnitude:

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.

catalogues

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:

position (equinox 1950.0)

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

references

to a study

742754D (designation: *)

miscanellous

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

variability type description

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

catalogues and names	Kuma, n²Dra, NSV 09164, 25 Dra, HR 6555, HD 159560, SAO 30450, BD +55 1945, FK5: 657, WDS 17323+5510A
constellation	Draco