Alula Borealis


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


catalogues and names Alula Borealis, n UMa, NSV 18715, 54 UMa, HR 4377, HD 98262, SAO 62486, FK5: 425, WDS 11185+3306
constellation Ursa Major

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

note (category: star names): Alula Borealis.

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

position, motion, parallax:

position (J2000) RA: 11h 18min 28,7sec DEC: +33 5' 39''
position (J1900) RA: 11h 13min 4,7sec DEC: +33 38' 24''
proper motion (J2000) RA: -0,026 arcsec/a DEC: 0,028 arcsec/a
radial velocity -9 km/s
note: spectroscopic binaries
rotational velocity <19 km/s
trigonometric parallax 0,02 arcsec
note (category: dynamical parallaxes): 0.005".

magnitude

visual magnitude 3,48
(V on UBV Johnson system)

spectral / color information

spectral class K3-IIIBa0.3
B-V-magnitude 1,4
U-B-magnitude 1,55
R-I-magnitude 0,7

double/multiple star system information

separation 7,2 arcsec
mag difference (of double or brightest multiple) 6
note (category: double and multiple data): CPM.

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

position, motion, parallax:

position (J2000) RA: 11h 18min 28,738sec DEC: +33 5' 39,44'' 0,06 arcsec source: 15
proper motion (J2000) RA: -0,0021 arcsec/a DEC: 0,028 arcsec/a source: 25
radial velocity -9 km/s source: 25
trigonometric parallax 0,02 0,002 arcsec source: 25
galactic coord. (B1950) longitude: 190,74 latitude: 69,08
GCI unit vector (J2000) X: -0,824062 Y: 0,15095 Z: 0,546018

magnitude:

visual 3,48 (observed) source: 25
photovisual 3,7 source: 2

spectral information:

spectral class K0 source: 96
Morgan-Keenan K3-III source: 25
B-magnitude 4,88 0,05 B-V-magnitude 1,4
U-magnitude 6,43 0,05 U-B-magnitude 1,55

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 7,3 arcsec
magnitude difference between brightest and second brightest component 6,6
position angle 147

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 15min 46,947sec DEC: +33 22' 2,56'' 0,004 arcsec
position (J2000) RA: 11h 18min 28,735sec DEC: +33 5' 39,4''
proper motion J1950 (FK4) RA: -0,0022 arcsec/a DEC: 0,023 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0021 arcsec/a DEC: 0,028 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 3,7 (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: 425
Durchmusterung BD+33 2098
Boss General Catalogue 15547
Henry Draper Catalogue 98262

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

position and proper motion:

position (J2000) RA: 11h 18,5min DEC: +33 6'
proper motion (J2000) RA: -0,026 arcsec/a DEC: 0,028 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
- 1830 30 147 7,1'' 3,48 10,1 K3IIIBaO STF1524
1973 - 7,3''

discoverer information:

discoverer code discoverer reference
STF1524 Struve, F.G.W. -

notes:

note Nu UMa.