Dubhe

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 Dubhe, a UMa, NSV 05070, 50 UMa, HR 4301, HD 95689, SAO 15384, FK5: 417, WDS 11037+6145
other names Dubb, Ak
constellation Ursa Major

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

note (category: star names): DUBHE; Dubb; Ak.

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

position, motion, parallax:

position (J2000) RA: 11h 3min 43,7sec DEC: +61° 45' 3''
position (J1900) RA: 10h 57min 33,6sec DEC: +62° 17' 27''
proper motion (J2000) RA: -0,119 arcsec/a DEC: -0,067 arcsec/a
radial velocity -9 km/s
note: spectroscopic binaries
note: orbital data avaible
rotational velocity <17 km/s (uncertain) (variable)
trigonometric parallax 0,038 arcsec
note (category: dynamical parallaxes): 0.039".

magnitude

visual magnitude 1,79
(V on UBV Johnson system)

spectral / color information

spectral class K0IIIa
B-V-magnitude 1,07
U-B-magnitude 0,92
R-I-magnitude 0,58
note (category: spectra): Balloon-borne spectrometer revealed pronounced emission of MgII.

variability information

variable star identification 5070
note (category: variability): ADS 8035A; B also var. suspect NSV 5071, too close to primary to be certain of variability.

double/multiple star system information

separation 0,5 arcsec
mag difference (of double or brightest multiple) 3
note (category: double and multiple data): 1.87 K0III, 4.81 F0V, 44.4y, a = 0.603". Also classified K0II-III + A8V:. Combined mag., colors. Also CPM at 280" with HD 95638 = GC 15179, 7.12V F8; SB, 6.04d.
note (category: spectroscopic binaries): 44.0y, K 2.0k/s, V0 -8.7k/s, asini 414. Unresolved by speckle interferometry.

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

position, motion, parallax:

position (J2000) RA: 11h 3min 43,666sec DEC: +61° 45' 3,22'' ±0,06 arcsec source: 15
proper motion (J2000) RA: -0,0168 arcsec/a DEC: -0,066 arcsec/a source: 25
radial velocity -9 km/s source: 25
trigonometric parallax 0,038 ±0,004 arcsec source: 25
galactic coord. (B1950) longitude: 142,84° latitude: 51,01°
GCI unit vector (J2000) X: -0,45911 Y: 0,115048 Z: 0,880898

magnitude:

visual 1,8 (observed) source: 25
photovisual 2 source: 2

spectral information:

spectral class K0 source: 96
Morgan-Keenan K0-IIIa source: 25
B-magnitude 2,87 ±0,05 B-V-magnitude 1,07
U-magnitude 3,77 ±0,05 U-B-magnitude 0,9

double/multiple star system information:

source of data: 19
magnitude difference between brightest and second brightest component 2,8

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: 11h 0min 39,57sec DEC: +62° 1' 16,8'' ±0,003 arcsec
position (J2000) RA: 11h 3min 43,695sec DEC: +61° 45' 3,17''
proper motion J1950 (FK4) RA: -0,0168 arcsec/a DEC: -0,071 arcsec/a ±0,001 arcsec/a in RA
±0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0164 arcsec/a DEC: -0,067 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 2 (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: 417
Durchmusterung BD+62 1161
Boss General Catalogue 15185
Henry Draper Catalogue 95689

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

position and proper motion:

position (J2000) RA: 11h 3,7min DEC: +61° 45'
proper motion (J2000) RA: -0,119 arcsec/a DEC: -0,067 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
- 1889 43 ° '' 1,8 4,6 G9III BU 1077

discoverer information:

discoverer code discoverer reference
BU 1077 Burnham, S.W. -

notes:

note Alpha UMa. P = 44.4yr., a = 0.60", motion retrograde. Faint, distant pair (BU) 1881.12, 203.5@, 384.9", 7.60V. Possible common proper motion with the spectroscopic binary HD 95638 at 280".

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

position:

position (J1950) RA: 11h 0min 39,6sec DEC: +62° 1' 17''

variability informations:

magnitute at max. brightness 1,79
magnitute at min. brightness 1,82
photometric system visual, photovisual or Johnson's V

spectral information

spectral class K0

references

to a study 290477D (designation: ZI 866)

miscanellous

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