Altair


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 Altair, a Aql, NSV 24910, 53 Aql, HR 7557, HD 187642, SAO 125122, FK5: 745, WDS 19508+0852A
other names Atair
constellation Aquila

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

note (category: star names): ALTAIR; Atair.

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

position, motion, parallax:

position (J2000) RA: 19h 50min 47sec DEC: +8 52' 6''
position (J1900) RA: 19h 45min 54,2sec DEC: +8 36' 15''
proper motion (J2000) RA: 0,538 arcsec/a DEC: 0,386 arcsec/a
radial velocity -26 km/s
rotational velocity 242 km/s (uncertain) (variable)
trigonometric parallax 0,198 arcsec

magnitude

visual magnitude 0,77
(V on UBV Johnson system)

spectral / color information

spectral class A7V
B-V-magnitude 0,22
U-B-magnitude 0,08
R-I-magnitude 0,14

double/multiple star system information

number of components of multiple star system 3
separation 165,2 arcsec
mag difference (of double or brightest multiple) 8,6
component ID AB
note (category: double and multiple data): Component B optical.

miscellaneous information

note (category: stellar radii or diameters): Diam. = 0.00278 - 0.00298".

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

position, motion, parallax:

position (J2000) RA: 19h 50min 47,002sec DEC: +8 52' 6,03'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,0363 arcsec/a DEC: 0,386 arcsec/a source: 25
radial velocity -26 km/s source: 25
trigonometric parallax 0,198 0,02 arcsec source: 25
galactic coord. (B1950) longitude: 47,74 latitude: -8,91
GCI unit vector (J2000) X: 0,459222 Y: -0,874842 Z: 0,154164

magnitude:

visual 0,77 (observed) source: 25
photovisual 0,9 source: 2

spectral information:

spectral class A5 source: 96
Morgan-Keenan A7V source: 25
B-magnitude 0,99 0,05 B-V-magnitude 0,22
U-magnitude 1,07 0,05 U-B-magnitude 0,08

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 165,2 arcsec
magnitude difference between brightest and second brightest component 8,8
position angle 301

component magnitude spectral class catalogue(s)/name(s)
A 0,77 A5 Altair, a Aquilae, 53 Aql, HR 7557, HD 187642, SAO 125122
B 9,6 -

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: 19h 48min 20,59sec DEC: +8 44' 5,71'' 0,003 arcsec
position (J2000) RA: 19h 50min 47,001sec DEC: +8 52' 6,07''
proper motion J1950 (FK4) RA: 0,0362 arcsec/a DEC: 0,387 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0363 arcsec/a DEC: 0,387 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 0,9 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class A5
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 745
Durchmusterung BD+08 4236
Boss General Catalogue 27470
Henry Draper Catalogue 187642

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

position and proper motion:

position (J2000) RA: 19h 50,8min DEC: +8 52'
proper motion (J2000) RA: 0,538 arcsec/a DEC: 0,386 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
AB 1836 13 322 152,4'' 0,77 9,6 A7V STF 10
1925 301 165,2''
AC 1905 2 94 238,4'' 0,77 10,1 - STF 10
1959 100 247,2''

discoverer information:

discoverer code discoverer reference
STF 10 Struve, F.G.W. -

notes:

note Alpha Aql. B is BD+08@4232. Proper motion of B +003 -009.