b Sextantis

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. Combined General Catalogue of Variable Stars (Vol. I-III)

catalogues and names b Sex, bet Sex, 30 Sex, HR 4119, HD 90994, SAO 137608, FK5: 2841
constellation Sextans

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

position, motion, parallax:

position (J2000) RA: 10h 30min 17,5sec DEC: -0 38' 13''
position (J1900) RA: 10h 25min 10,7sec DEC: -0 7' 27''
proper motion (J2000) RA: -0,04 arcsec/a DEC: -0,023 arcsec/a
radial velocity 12 km/s
rotational velocity 114 km/s (uncertain) (variable)


visual magnitude 5,09
(V on UBV Johnson system)

spectral / color information

spectral class B6V
B-V-magnitude -0,14
U-B-magnitude -0,52
R-I-magnitude -0,14

variability information

variable star identification Bet Sex
note (category: variability): Slight variation with period or half-period of about 8d suspected.

miscellaneous information

note (category: group membership): Member of Pleiades group.

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

position, motion, parallax:

position (J2000) RA: 10h 30min 17,475sec DEC: -0 38' 13,35'' 0,43 arcsec source: 16
proper motion (J2000) RA: -0,0029 arcsec/a DEC: -0,027 arcsec/a source: 25
radial velocity 12 km/s source: 25
galactic coord. (B1950) longitude: 246,43 latitude: 46,17
GCI unit vector (J2000) X: -0,924308 Y: 0,381485 Z: -0,011118


visual 5,09 (observed) source: 25
photovisual 5 source: 2
photographic 4,8 source: 16

spectral information:

spectral class B5 source: 96
Morgan-Keenan B6V source: 25
B-magnitude 4,95 0,05 B-V-magnitude -0,14
U-magnitude 4,43 0,05 U-B-magnitude -0,52

variability information:

source of data: 27
variability type 160
var. amplitude 0,1


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
16 PPM North and PPM South Catalogs and PPM Supplement
Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993
25 Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994
27 Catalog of Red Magnitudes (CRM)
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 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: 10h 27min 44,099sec DEC: -0 22' 47,84'' 0,017 arcsec
position (J2000) RA: 10h 30min 17,49sec DEC: -0 38' 13,24''
proper motion J1950 (FK4) RA: -0,0028 arcsec/a DEC: -0,026 arcsec/a 0,003 arcsec/a in RA
0,003 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0026 arcsec/a DEC: -0,022 arcsec/a
source of proper motion data Determined by source catalog


visual 5 (accuracy: 2 decimals)
source of visual magnitude data Taken from Harvard or San Luis photometry.

spectral information:

spectral class B5
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.


source catalogue GC, catalogue number: 14431
Durchmusterung BD+00 2663
Boss General Catalogue 14431
Henry Draper Catalogue 90994

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)


position (J1950) RA: 10h 27min 44,1sec DEC: -0 22' 48''

variability informations:

variability type ACV: rotating variable star
magnitute at max. brightness 5
magnitute at min. brightness 5,1
photometric system visual, photovisual or Johnson's V


to a study G.Mathys, J.Manfroid, P.Renson, AsAp Suppl 63,No.3,403,1986.
to a chart/photograph no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'


ID in the GCVS catalogue 77/9002
constellation Sagittarius
notes on existence The star is equivalent to '69151'.

variability type description

variability type description
ACV Alpha2 Canum Venaticorum variables. These are main-sequence stars with spectral types B8p-A7p and displaying strong magnetic fields.
Spectra show abnormally strong lines of Si, Sr, Cr, and rare earths whose intensities vary with rotation. They exhibit magnetic field and brightness changes (periods of 0.5-160 days or more). The amplitudes of the brightness changes are usually withine 0.01-0.1 mag in V.

Rapidly oscillating Alpha2 CVn variables. These are nonradially pulsating, rotating magnetic variables of Ap spectral type (DO Eri). Pulsation periods are in the range of 6-12 mmag (0.004-0.01 days), while amplitudes of light variation caused by the pulsation are about 0.01 mag in V. The pulsational variations are superposed on those caused by rotation.