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 (suspected variables)

catalogues and names Saiph, k Ori, NSV 02641, 53 Ori, HR 2004, HD 38771, SAO 132542, FK5: 220
constellation Orion

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

note (category: star names): SAIPH.

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

position, motion, parallax:

position (J2000) RA: 5h 47min 45,4sec DEC: -9 40' 11''
position (J1900) RA: 5h 43min 0,8sec DEC: -9 42' 18''
proper motion (J2000) RA: 0,002 arcsec/a DEC: -0,002 arcsec/a
radial velocity 21 km/s
note: suspected variable radial velocity
rotational velocity 82 km/s (uncertain) (variable)
trigonometric parallax 0,015 arcsec


visual magnitude 2,06
(V on UBV Johnson system)

spectral / color information

spectral class B0.5Ia
B-V-magnitude -0,17
U-B-magnitude -1,03
R-I-magnitude -0,18
note (category: spectra): Deficient in ultraviolet relative to most early-type supergiants shortward of 2800A.
note (category: colors): Color excess E(B-V) = +0.07.

variability information

variable star identification 2641

miscellaneous information

note (category: group membership): Ori OB1.
note (category: stellar radii or diameters): Diam. 0.00044 - 0.00045".

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

position, motion, parallax:

position (J2000) RA: 5h 47min 45,387sec DEC: -9 40' 10,75'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,0001 arcsec/a DEC: -0,002 arcsec/a source: 25
radial velocity 21 km/s source: 25
trigonometric parallax 0,015 0,002 arcsec source: 25
galactic coord. (B1950) longitude: 214,52 latitude: -18,5
GCI unit vector (J2000) X: 0,052639 Y: 0,984386 Z: -0,167967


visual 2,06 (observed) source: 25
photovisual 2,2 source: 2
photographic 2 source: 2

spectral information:

spectral class B0 source: 96
Morgan-Keenan B0.5Ia source: 25
B-magnitude 1,89 0,05 B-V-magnitude -0,17
U-magnitude 0,86 0,05 U-B-magnitude -1,03


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: 5h 45min 23,013sec DEC: -9 41' 9,45'' 0,004 arcsec
position (J2000) RA: 5h 47min 45,394sec DEC: -9 40' 10,86''
proper motion J1950 (FK4) RA: -0,0002 arcsec/a DEC: -0,005 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0002 arcsec/a DEC: -0,004 arcsec/a
source of proper motion data Determined by source catalog


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

spectral information:

spectral class B0
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.


source catalogue FK4, catalogue number: 220
Durchmusterung BD-09 1235
Boss General Catalogue 7264
Henry Draper Catalogue 38771

data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)


position (J1950) RA: 5h 45min 23sec DEC: -9 41' 9''

variability informations:

magnitute at max. brightness 2,01
magnitute at min. brightness 2,09
photometric system visual, photovisual or Johnson's V

spectral information

spectral class B0


to a study 0807D (designation: 141G ORI)


There are notes in the published catalog (Kukarkin et al.(1982)).