Metallah


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 Metallah, a Tri, alf Tri, 2 Tri, HR 544, HD 11443, SAO 74996, FK5: 64, WDS 01531+2935A
other names Mothallah, Atria, Caput Trianguli, Ras al Muthallah, Elmuthalleth
constellation Triangulum

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

note (category: star names): Metallah; Mothallah; Atria; Caput Trianguli; Ras al Muthallah; Elmuthalleth.

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

position, motion, parallax:

position (J2000) RA: 1h 53min 4,9sec DEC: +29 34' 44''
position (J1900) RA: 1h 47min 22,7sec DEC: +29 5' 30''
proper motion (J2000) RA: 0,011 arcsec/a DEC: -0,235 arcsec/a
radial velocity -13 km/s
note: spectroscopic binaries, single lined spectra
note: orbital data avaible
rotational velocity 93 km/s (uncertain) (variable)
trigonometric parallax 0,057 arcsec

magnitude

visual magnitude 3,41
(V on UBV Johnson system)

spectral / color information

spectral class F6IV
B-V-magnitude 0,49
U-B-magnitude 0,06
R-I-magnitude 0,28

double/multiple star system information

number of components of multiple star system 3
separation 222,3 arcsec
mag difference (of double or brightest multiple) 8,6
component ID AC
note Worley (1978) update of the IDS
note (category: double and multiple data): Visual companions probably optical.
note (category: spectroscopic binaries): 1.7365d, K 12.4k/s, V0 -20.0k/s, asini 0.296.

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

position, motion, parallax:

position (J2000) RA: 1h 53min 4,905sec DEC: +29 34' 43,82'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,0009 arcsec/a DEC: -0,235 arcsec/a source: 25
radial velocity -13 km/s source: 25
trigonometric parallax 0,057 0,006 arcsec source: 25
galactic coord. (B1950) longitude: 138,65 latitude: -31,4
GCI unit vector (J2000) X: 0,765944 Y: 0,411909 Z: 0,493621

magnitude:

visual 3,41 (observed) source: 25
photovisual 3,6 source: 2

spectral information:

spectral class F5 source: 96
Morgan-Keenan F6IV source: 25
B-magnitude 3,9 0,05 B-V-magnitude 0,49
U-magnitude 3,96 0,05 U-B-magnitude 0,06

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 85 arcsec
magnitude difference between brightest and second brightest component 9,5
position angle 309

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: 1h 50min 13,44sec DEC: +29 20' 10,14'' 0,004 arcsec
position (J2000) RA: 1h 53min 4,899sec DEC: +29 34' 43,94''
proper motion J1950 (FK4) RA: 0,0008 arcsec/a DEC: -0,229 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0008 arcsec/a DEC: -0,234 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 3,6 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class F5
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 64
Durchmusterung BD+28 312
Boss General Catalogue 2272
Henry Draper Catalogue 11443

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

position and proper motion:

position (J2000) RA: 1h 53,1min DEC: +29 35'
proper motion (J2000) RA: 0,011 arcsec/a DEC: -0,235 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 1879 2 304 80,6'' 3,41 12,9 F6IV BUP 27
1909 309 85''
AC 1879 2 182 228,3'' 3,41 12,2 F6IV BUP 27
1909 - 222,3''
AD 1879 1 173 308,3'' 3,41 10,5 F6IV BUP 27

discoverer information:

discoverer code discoverer reference
BUP 27 - -

notes:

note Alpha Tri. A is a spectroscopic binary, P = 1.77d.