Al Dhanab


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


catalogues and names Al Dhanab, g Gru, HR 8353, HD 207971, SAO 213374, FK5: 822
constellation Grus

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


position, motion, parallax:

position (J2000) RA: 21h 53min 55,7sec DEC: -37° 21' 54''
position (J1900) RA: 21h 47min 52,5sec DEC: -37° 50' 6''
proper motion (J2000) RA: 0,102 arcsec/a DEC: -0,021 arcsec/a
radial velocity -2 km/s
note: suspected variable radial velocity
rotational velocity 68 km/s (uncertain) (variable)
trigonometric parallax 0,013 arcsec

magnitude

visual magnitude 3,01
(V on UBV Johnson system)

spectral / color information

spectral class B8III
B-V-magnitude -0,12
U-B-magnitude -0,37
R-I-magnitude -0,06

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

position, motion, parallax:

position (J2000) RA: 21h 53min 55,73sec DEC: -37° 21' 53,6'' ±0,06 arcsec source: 15
proper motion (J2000) RA: 0,0086 arcsec/a DEC: -0,021 arcsec/a source: 25
radial velocity -2 km/s source: 25
trigonometric parallax 0,013 ±0,001 arcsec source: 25
galactic coord. (B1950) longitude: 6,11° latitude: -51,47°
GCI unit vector (J2000) X: 0,677538 Y: -0,415485 Z: -0,606889

magnitude:

visual 3,01 (observed) source: 25
photovisual 3,2 source: 2
photographic 3,1 source: 2

spectral information:

spectral class B8 source: 96
Morgan-Keenan B8III source: 25
B-magnitude 2,89 ±0,05 B-V-magnitude -0,12
U-magnitude 2,52 ±0,05 U-B-magnitude -0,37

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
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: 21h 50min 54,45sec DEC: -37° 36' 3,59'' ±0,009 arcsec
position (J2000) RA: 21h 53min 55,744sec DEC: -37° 21' 53,48''
proper motion J1950 (FK4) RA: 0,0087 arcsec/a DEC: -0,017 arcsec/a ±0,002 arcsec/a in RA
±0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0087 arcsec/a DEC: -0,02 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

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

spectral information:

spectral class B8
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 822
Durchmusterung CD-3714536
Boss General Catalogue 30640
Henry Draper Catalogue 207971