s Orionis

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. 4th Catalog of Orbits of Visual Binaries

catalogues and names s Ori, NSV 16610, 48 Ori, HR 1931, HD 37468, SAO 132406, WDS 05387-0236A
constellation Orion

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


position, motion, parallax:

position (J2000) RA: 5h 38min 44,8sec DEC: -2° 36' 0''
position (J1900) RA: 5h 33min 43,5sec DEC: -2° 39' 28''
proper motion (J2000) RA: 0,002 arcsec/a DEC: 0,001 arcsec/a
radial velocity 29 km/s
note: spectroscopic binaries
rotational velocity 94 km/s (uncertain) (variable)
trigonometric parallax 0,007 arcsec
note (category: dynamical parallaxes): 0.003".

magnitude

visual magnitude 3,81
(V on UBV Johnson system)

spectral / color information

spectral class O9.5V
B-V-magnitude -0,24
U-B-magnitude -1,01
R-I-magnitude -0,24
note (category: spectra): Hydrogen deficient. Interstellar Lyman alpha absorption observed by AEROBEE rocket.

double/multiple star system information

number of components of multiple star system 5
separation 0,2 arcsec
mag difference (of double or brightest multiple) 0,8
component ID AB
note (category: double and multiple data): AB 4.1 O9.5V, 5.1 B0.5V, 170y, a = 0.247". Combined mag. and colors. C, 8.79V, A2V at 11" may be physical; D, 6.62V, -0.20(B-V), B2V, at 13" and E = HR 1932, at 42" CPM with A. A multiple system similar to trapezium. ADS 4241 possibly the most massive visual binary known, 35 solar masses.

miscellaneous information

note (category: group membership): Ori OB1b1; Orion belt; HII reg.; IC 434; a trapezium system.

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

position, motion, parallax:

position (J2000) RA: 5h 38min 44,778sec DEC: -2° 36' 0,34'' ±0,35 arcsec source: 17
proper motion (J2000) RA: 0,0003 arcsec/a DEC: -0,001 arcsec/a source: 25
radial velocity 29 km/s source: 25
trigonometric parallax 0,007 ±0,001 arcsec source: 25
galactic coord. (B1950) longitude: 206,82° latitude: -17,34°
GCI unit vector (J2000) X: 0,092509 Y: 0,994678 Z: -0,045365

magnitude:

visual 3,81 (observed) source: 25
photovisual 3,8 source: 2
photographic 3,5 source: 2

spectral information:

spectral class B0 source: 96
Morgan-Keenan O9.5V source: 25
B-magnitude 3,57 ±0,05 B-V-magnitude -0,24
U-magnitude 2,56 ±0,05 U-B-magnitude -1,01

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 0,3 arcsec
magnitude difference between brightest and second brightest component 2
position angle 125 °

component magnitude spectral class catalogue(s)/name(s)
A 3,81 B0 s Orionis, 48 Ori, HR 1931, HD 37468, SAO 132406
B 6,6 B3 HR 1932, HD 37479, SAO 132408

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
17 ACRS
Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 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
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 36min 14,048sec DEC: -2° 37' 38,49'' ±0,01 arcsec
position (J2000) RA: 5h 38min 44,76sec DEC: -2° 36' 0,15''
proper motion J1950 (FK4) RA: -0,0002 arcsec/a DEC: 0,001 arcsec/a ±0,002 arcsec/a in RA
±0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0001 arcsec/a DEC: 0,001 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 3,8 (accuracy: 2 decimals)
source of visual magnitude data Combined magnitude of component stars.

spectral information:

spectral class B0
source of spectral data Taken from the HD with M stars reclassified by Miss Cannon.

remarks for duplicity and variability

Double star - see source catalog for source

catalogues

source catalogue FK3, catalogue number: 213
Durchmusterung BD-02 1326
Boss General Catalogue 7031
Henry Draper Catalogue 37468

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

position and proper motion:

position (J2000) RA: 5h 38,7min DEC: -2° 36'
proper motion (J2000) RA: 0,005 arcsec/a DEC: -0,001 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
AB 1888 76 358° 0,2'' 4 6 O9.5V BU 1032
1994 125° 0,3''
AB-C 1831 30 236° 11'' 3,73 8,79 - STF 762
1973 238° 11,4''
AB-D 1831 36 84° 12,9'' 3,73 6,66 - STF 762
AB-E 1831 27 61° 41,6'' 3,73 6,72 B2V STF 762
DC 1868 4 251° 24'' - - - STF 762
EC 1868 1 240° 53,8'' - - - STF 762
ED 1831 9 231° 30,1'' 6,66 7,9 B2Vp STF 762

discoverer information:

discoverer code discoverer reference
BU 1032 Burnham, S.W. -
STF 762 Struve, F.G.W. -

notes:

note Sigma Ori. P = 155.3yr., a = 0.264", motion retrograde. A is variable, V1030 Ori. This is a trapezium system with at least five components, including the helium- rich star E , BD-02@1327. A has also been reported to be a short period, double-lined spectroscopic binary.

data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)

position:

position (J1900) RA: 5h 33,7min DEC: -2° 39'

magnitudes, spectral classes, orbital elements:

author: W.D. Heintz
date of observation: 1972
magnitude of component A: 4,2
magnitude of component B: 4,2
spectral class component B: O9.5V
spectral class component B: O9.5V
period [y]: 170
semi-major axis [arcsec]: 0,247
inclination [deg]: 165
node [deg]: 124,5
equinox of node: 2000
eccentricity: 0,07
time of periastron passage: 1970
dates of ephemeris: 1974-1992
grade: reliable
reference: Astron. J. 79; 397; 1974.
notes Brightest pair in a trapezium system (STF 762) which includes the components C (mag. 8.79, 11", A2V), D (mag. 6.62, 13", B2V), and the helium-rich star E (mag. 6.5, 42", B1Vp). Heintz gives formulae for the motions AB-C and AB-D.