a Lacertae


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 a Lac, 7 Lac, HR 8585, HD 213558, SAO 34542, FK5: 848, WDS 22313+5017
constellation Lacerta

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


position, motion, parallax:

position (J2000) RA: 22h 31min 17,5sec DEC: +50 16' 57''
position (J1900) RA: 22h 27min 10,2sec DEC: +49 46' 6''
proper motion (J2000) RA: 0,138 arcsec/a DEC: 0,019 arcsec/a
radial velocity -4 km/s
note: suspected variable radial velocity
rotational velocity 146 km/s (uncertain) (variable)
trigonometric parallax 0,04 arcsec

magnitude

visual magnitude 3,77
(V on UBV Johnson system)

spectral / color information

spectral class A1V
B-V-magnitude 0,01
U-B-magnitude 0
R-I-magnitude -0,03

double/multiple star system information

separation 36,3 arcsec
mag difference (of double or brightest multiple) 8,3
note (category: double and multiple data): Optical.

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

position, motion, parallax:

position (J2000) RA: 22h 31min 17,497sec DEC: +50 16' 57,05'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,0144 arcsec/a DEC: 0,019 arcsec/a source: 25
radial velocity -4 km/s source: 25
trigonometric parallax 0,04 0,004 arcsec source: 25
galactic coord. (B1950) longitude: 101,26 latitude: -6,6
GCI unit vector (J2000) X: 0,59173 Y: -0,241205 Z: 0,769205

magnitude:

visual 3,77 (observed) source: 25
photovisual 3,9 source: 2

spectral information:

spectral class A0 source: 96
Morgan-Keenan A1V source: 25
B-magnitude 3,78 0,05 B-V-magnitude 0,01
U-magnitude 3,78 0,05 U-B-magnitude 0

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 36,3 arcsec
magnitude difference between brightest and second brightest component 8
position angle 294

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: 22h 29min 13,558sec DEC: +50 1' 29,96'' 0,004 arcsec
position (J2000) RA: 22h 31min 17,494sec DEC: +50 16' 57,09''
proper motion J1950 (FK4) RA: 0,014 arcsec/a DEC: 0,023 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0143 arcsec/a DEC: 0,019 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 3,9 (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.

catalogues

source catalogue FK4, catalogue number: 848
Durchmusterung BD+49 3875
Boss General Catalogue 31471
Henry Draper Catalogue 213558

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

position and proper motion:

position (J2000) RA: 22h 31,3min DEC: +50 17'
proper motion (J2000) RA: 0,138 arcsec/a DEC: 0,019 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
- 1878 8 299 30,2'' 3,77 11,8 A1V BU 703
1925 294 36,3''

discoverer information:

discoverer code discoverer reference
BU 703 Burnham, S.W. -

notes:

note Alpha Lac. Optical.