catalogues and names

The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

Combined General Catalogue of Variable Stars (Vol. I-III)

catalogues and names

catalogues and names	Pherkad, g UMi, gam UMi, 13 UMi, HR 5735, HD 137422, SAO 8220, BD +72 679, FK5: 569
other names	Pherkad Major
constellation	Ursa Minor

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

note (category: star names):

Pherkad; Pherkad Major. See HR 5563 and 5714.

position, motion, parallax:

position (J2000)	RA: 15h 20min 43.7sec	DEC: +71° 50' 2''
position (B1900)	RA: 15h 20min 52.9sec	DEC: +72° 11' 23''
proper motion (J2000)	RA: -0.019 arcsec/a	DEC: 0.02 arcsec/a
radial velocity	-4 km/s note: variable radial velocity
rotational velocity	171 km/s (uncertain) (variable)
trigonometric parallax	0.003 arcsec
galactic coordinates	longitude: 108.46°	latitude: 40.84°

note (category: radial and/or rotational velocities):

0.108449d, but not SB. Variable elements.

magnitude

visual magnitude

3.05 (V on UBV Johnson system)

spectral / color information

spectral class	A3II-III
B-V-magnitude	0.05
U-B-magnitude	0.12
R-I-magnitude
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

note (category: spectra):

Shell star, but shell possibly variable.

variability information

variable star identification

Gam UMi

note (category: variability):

Delta Sct? Amp. 0.03V. Hydrogen and CaII variable.

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

position, motion, parallax:

position (J2000)	RA: 15h 20min 43.713sec	DEC: +71° 50' 2.49''	±0.06 arcsec	source: 15
proper motion (J2000)	RA: -0.004 arcsec/a	DEC: 0.02 arcsec/a		source: 25
radial velocity	-4 km/s			source: 25
trigonometric parallax	0.003 arcsec		-	source: 25
galactic coord. (B1950)	longitude: 108.46°	latitude: 40.84°

magnitude:

visual	3.05 (observed)	source: 25
photovisual	3.1	source: 2

spectral information:

spectral class	A2		source: 96
Morgan-Keenan	A3II-III		source: 25
B-magnitude	3.1 ±0.05	B-V-magnitude	0.05
U-magnitude	3.22 ±0.05	U-B-magnitude	0.12

variability information:

source of data: 30

variability type	10
var. amplitude	0.05
var. period	0.14
var. epoch	2439950 3. April 1968, 12:00:00 UT
next max light	2452219.18 5. November 2001, 16:19:12 UT

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
25	Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994
30	GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
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: 15h 20min 47.347sec	DEC: +72° 0' 42.97''	±0.004 arcsec
position (J2000)	RA: 15h 20min 43.726sec	DEC: +71° 50' 2.53''
proper motion B1950 (FK4)	RA: -0.0051 arcsec/a	DEC: 0.019 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0038 arcsec/a	DEC: 0.021 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	3.1 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	A2
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 569
Durchmusterung	BD+72 679
Boss General Catalogue	20692
Henry Draper Catalogue	137422

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)

position:

position (equinox 1950.0)

RA: 15h 20min 47.3sec

DEC: +72° 0' 43''

variability informations:

variability type	DSCTC	pulsating variable star
magnitute at max. brightness	3.04
magnitute amplitude	0.05
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2439950.367 3. April 1968, 20:48:29 UT
period [d]	0.143009
next maximum light [JD]	2452219.252119 5. November 2001, 18:03:03 UT

spectral information

spectral class

A3II-III

references

to a study	Vol. III GCVS
to a chart/photograph	no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'

miscanellous

ID in the GCVS catalogue	84/9003
constellation	Ursa Minor
notes on existence	The star is equivalent to '0849005 eps'.
There are notes in published catalog.

variability type description

variability type

description

DSCTC

Variables of the Delta Scuti type. These are pulsating variables of spectral types A0-F5 III-V displaying light amplitudes from 0.003 to 0.9 mag in V (usually several hundredths of a magnitude) and periods from 0.01 to 0.2 days. The shapes of the light curves, periods, and amplitudes usually vary greatly. Radial as well as nonradial pulsations are observed. The variability of some members of this type appears sporadically and sometimes completely ceases, this being a consequence of strong amplitude modulation with the lower value of the amplitude not exceeding 0.001 mag in some cases. The maximum of the surface layer expansion does not lag behind the maximum light for more than 0.1 periods. DSCT stars are representatives of the galactic disk (flat component) and are phenomenologically close to the SX Phe variables. DSCTC Low amplitude group of Delta Sct variables (light amplitude <0.1 mag in V). The majority of this type's representatives are stars of luminosity class V; objects of this subtype generally are representative of the Delta Sct variables in open clusters.