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 Merak, b UMa, NSV 05053, 48 UMa, HR 4295, HD 95418, SAO 27876, FK5: 416
other names Mirak
constellation Ursa Major

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

note (category: star names): MERAK; Mirak.

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

position, motion, parallax:

position (J2000) RA: 11h 1min 50,5sec DEC: +56 22' 57''
position (J1900) RA: 10h 55min 48,6sec DEC: +56 55' 7''
proper motion (J2000) RA: 0,082 arcsec/a DEC: 0,034 arcsec/a
radial velocity -12 km/s
note: spectroscopic binaries
rotational velocity 39 km/s (uncertain) (variable)
trigonometric parallax 0,053 arcsec


visual magnitude 2,37
(V on UBV Johnson system)

spectral / color information

spectral class A1V
B-V-magnitude -0,02
U-B-magnitude 0,01
R-I-magnitude -0,04

variability information

variable star identification 5053

miscellaneous information

note (category: group membership): "Dipper Stars;" UMa cluster; Sirius group; UMa stream.

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

position, motion, parallax:

position (J2000) RA: 11h 1min 50,482sec DEC: +56 22' 56,65'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,0099 arcsec/a DEC: 0,034 arcsec/a source: 25
radial velocity -12 km/s source: 25
trigonometric parallax 0,053 0,005 arcsec source: 25
galactic coord. (B1950) longitude: 149,17 latitude: 54,8
GCI unit vector (J2000) X: -0,535916 Y: 0,138993 Z: 0,832751


visual 2,37 (observed) source: 25
photovisual 2,4 source: 2

spectral information:

spectral class A0 source: 96
Morgan-Keenan A1V source: 25
B-magnitude 2,35 0,05 B-V-magnitude -0,02
U-magnitude 2,36 0,05 U-B-magnitude 0,01


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
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: 10h 58min 50,251sec DEC: +56 39' 3,12'' 0,004 arcsec
position (J2000) RA: 11h 1min 50,49sec DEC: +56 22' 56,57''
proper motion J1950 (FK4) RA: 0,0098 arcsec/a DEC: 0,029 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,01 arcsec/a DEC: 0,033 arcsec/a
source of proper motion data Determined by source catalog


visual 2,4 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class A0
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.


source catalogue FK4, catalogue number: 416
Durchmusterung BD+57 1302
Boss General Catalogue 15145
Henry Draper Catalogue 95418

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


position (J1950) RA: 10h 58min 50,3sec DEC: +56 39' 3''

variability informations:

magnitute at max. brightness 2,35
magnitute at min. brightness 2,4
photometric system visual, photovisual or Johnson's V

spectral information

spectral class A1


to a study 181865D (designation: BETA UMA)


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