Naos

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 Naos, z Pup, HR 3165, HD 66811, SAO 198752, FK5: 306
other names Suhail Hadar
constellation Puppis

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

note (category: star names): Naos; Suhail Hadar.

position, motion, parallax:

position (J2000) RA: 8h 3min 35,1sec DEC: -40° 0' 12''
position (J1900) RA: 8h 0min 4,1sec DEC: -39° 43' 17''
proper motion (J2000) RA: -0,027 arcsec/a DEC: 0,012 arcsec/a
radial velocity -24 km/s
note: suspected variable radial velocity
rotational velocity 211 km/s (uncertain) (variable)

magnitude

visual magnitude 2,25
(V on UBV Johnson system)

spectral / color information

spectral class O5f
B-V-magnitude -0,26
U-B-magnitude -1,11
R-I-magnitude -0,22
note (category: spectra): Also classified O4f, O4ef and O4I9n)f.
note (category: colors): Color excess E(B-V) = +0.04.

variability information

note (category: variability): Change in H alpha emission profile between 1974 and 1976 interpreted as change in rate of mass loss.

miscellaneous information

note (category: group membership): In cluster CR 173; in HII region.
note (category: stellar radii or diameters): Diam. = 0.00041 - 0.00042".
note (category: miscellaneous): With HR 3207, appears capable of producing most of the observed ionization of Gum Neb.

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

position, motion, parallax:

position (J2000) RA: 8h 3min 35,052sec DEC: -40° 0' 11,64'' ±0,06 arcsec source: 15
proper motion (J2000) RA: -0,0024 arcsec/a DEC: 0,012 arcsec/a source: 25
radial velocity -24 km/s source: 25
galactic coord. (B1950) longitude: 255,98° latitude: -4,71°
GCI unit vector (J2000) X: -0,393332 Y: 0,657312 Z: -0,642831

magnitude:

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

spectral information:

spectral class O0 source: 96
Morgan-Keenan O5f source: 25
B-magnitude 1,99 ±0,05 B-V-magnitude -0,26
U-magnitude 0,88 ±0,05 U-B-magnitude -1,11

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: 8h 1min 49,552sec DEC: -39° 51' 40,83'' ±0,009 arcsec
position (J2000) RA: 8h 3min 35,079sec DEC: -40° 0' 11,51''
proper motion J1950 (FK4) RA: -0,0027 arcsec/a DEC: 0,011 arcsec/a ±0,002 arcsec/a in RA
±0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0021 arcsec/a DEC: 0,013 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

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

spectral information:

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

catalogues

source catalogue FK4, catalogue number: 306
Durchmusterung CD-39 3939
Boss General Catalogue 10947
Henry Draper Catalogue 66811