Alsuhail

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

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

catalogues and names Alsuhail, l Vel, lam Vel, HR 3634, HD 78647, SAO 220878, FK5: 345, WDS 09080-4326
other names Al Suhail al Wazn, Suhail
constellation Vela

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

note (category: star names): Alsuhail; Al Suhail al Wazn; Suhail.

object is infrared source (Engels et al., 1982)

position, motion, parallax:

position (J2000) RA: 9h 7min 59,8sec DEC: -43° 25' 57''
position (J1900) RA: 9h 4min 19sec DEC: -43° 1' 44''
proper motion (J2000) RA: -0,019 arcsec/a DEC: 0,013 arcsec/a
radial velocity 18 km/s
trigonometric parallax 0,022 arcsec

magnitude

visual magnitude 2,21
(V on UBV Johnson system)

spectral / color information

spectral class K4.5Ib-II
B-V-magnitude 1,66
U-B-magnitude 1,81
R-I-magnitude 0,94
note (category: spectra): Ultraviolet FeII emission.

variability information

variable star identification Lam Vel
note (category: variability): Lc 2.14 - 2.22V.

double/multiple star system information

separation 18,2 arcsec
mag difference (of double or brightest multiple) 12,6
note Worley (1978) update of the IDS

miscellaneous information

note (category: miscellaneous): Young disk population.

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

position, motion, parallax:

position (J2000) RA: 9h 7min 59,776sec DEC: -43° 25' 57,38'' ±0,06 arcsec source: 15
proper motion (J2000) RA: -0,0017 arcsec/a DEC: 0,013 arcsec/a source: 25
radial velocity 18 km/s source: 25
trigonometric parallax 0,022 ±0,002 arcsec source: 25
galactic coord. (B1950) longitude: 265,94° latitude: 2,82°
GCI unit vector (J2000) X: -0,531089 Y: 0,495265 Z: -0,687501

magnitude:

visual 2,14 (observed) source: 30
photovisual 2,2 source: 2

spectral information:

spectral class K5 source: 96
Morgan-Keenan K4.5Ib source: 25
B-magnitude 3,87 ±0,05 B-V-magnitude 1,66
U-magnitude 5,68 ±0,05 U-B-magnitude 1,81

variability information:

source of data: 30
variability type 172
var. amplitude 0,16

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 18,2 arcsec
magnitude difference between brightest and second brightest component 12,6
position angle 137 °

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
30 GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
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: 9h 6min 9,31sec DEC: -43° 13' 47,6'' ±0,009 arcsec
position (J2000) RA: 9h 7min 59,8sec DEC: -43° 25' 57,22''
proper motion J1950 (FK4) RA: -0,002 arcsec/a DEC: 0,012 arcsec/a ±0,002 arcsec/a in RA
±0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0014 arcsec/a DEC: 0,014 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

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

spectral information:

spectral class K5
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 345
Durchmusterung CD-42 4990
Boss General Catalogue 12623
Henry Draper Catalogue 78647

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

position and proper motion:

position (J2000) RA: 9h 8min DEC: -43° 26'
proper motion (J2000) RA: -0,019 arcsec/a DEC: 0,013 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
- 1897 1 137° 18,2'' 2,21 14,8 K4Ib-II SEE 109

discoverer information:

discoverer code discoverer reference
SEE 109 See, T.J. -

notes:

note Lambda Vel. A is an irregular variable.

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

position:

position (J1950) RA: 9h 6min 9,3sec DEC: -43° 13' 48''

variability informations:

variability type LC pulsating variable star
magnitute at max. brightness 2,14
magnitute at min. brightness 2,3
photometric system visual, photovisual or Johnson's V

spectral information

spectral class K4Ib-IIa

references

to a study Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph no chart is avaible, but the star is contained in the 'Cordoba Durchmusterung'

miscanellous

ID in the GCVS catalogue 85/9011
constellation Vela
notes on existence The star is equivalent to '0859015 omi'.
There are notes in published catalog.

variability type description

variability type description
LC Slow irregular variables. The light variations of these stars show no evidence of periodicity, or any periodicity present is very poorly defined and appears only occasionally. Like for the type I, stars are often attributed to this type because of being insufficiently studied.
Many type L variables are really semiregulars or belong to other types.

LB
Slow irregular variables of late spectral types (K, M, C, S); as a rule, they are giants (CO Cyg). This type is also ascribed, in the GCVS, to slow red irregular variables in the case of unknown spectral types and luminosities.

LC
Irregular variable supergiants of late spectral types having amplitudes of about 1 mag in V (TZ Cas).