pi 5 Orionis

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

position, motion, parallax:

position (J2000)	RA: 4h 54min 15.1sec	DEC: +2° 26' 26''
position (B1900)	RA: 4h 49min 2.5sec	DEC: +2° 16' 37''
proper motion (J2000)	RA: 0 arcsec/a	DEC: 0 arcsec/a
radial velocity	23 km/s note: spectroscopic binaries note: orbital data avaible
rotational velocity	93 km/s (uncertain) (variable)
trigonometric parallax	0.003 arcsec
galactic coordinates	longitude: 196.27°	latitude: -24.56°

magnitude

visual magnitude

3.72
(V on UBV Johnson system)

spectral / color information

spectral class	B3III+B0V
B-V-magnitude	-0.18
U-B-magnitude	-0.83
R-I-magnitude

variability information

variable star identification

Pi5 Ori

note (category: variability):

Ell 3.66 - 3.73V, 3.700363d.

double/multiple star system information

note (category: spectroscopic binaries):

3.700373d, K 57.9k/s, V0 +24.2k/s, asini 2.95.

miscellaneous information

note (category: group membership):

Ori OB1.

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

position, motion, parallax:

position (J2000)	RA: 4h 54min 15.089sec	DEC: +2° 26' 26.34''	±0.06 arcsec	source: 15
proper motion (J2000)	RA: 0 arcsec/a	DEC: 0 arcsec/a		source: 25
radial velocity	23 km/s			source: 25
trigonometric parallax	0.003 arcsec		-	source: 25
galactic coord. (B1950)	longitude: 196.27°	latitude: -24.56°

magnitude:

visual	3.7 (observed)	source: 31
photovisual	3.9	source: 2

spectral information:

spectral class	B3		source: 96
Morgan-Keenan	B3III+B0V		source: 25
B-magnitude	3.54 ±0.05	B-V-magnitude	-0.18
U-magnitude	2.71 ±0.05	U-B-magnitude	-0.83

variability information:

source of data: 30

variability type	430
var. amplitude	0.07
var. period	3.7
var. epoch	2417923 13. December 1907, 12:00:00 UT
next max light	2452222 8. November 2001, 12:00:00 UT

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
30	GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
31	CRM' (non-GCVS variable data)
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 (B1950)	RA: 4h 51min 38.661sec	DEC: +2° 21' 37.24''	±0.004 arcsec
position (J2000)	RA: 4h 54min 15.084sec	DEC: +2° 26' 26.23''
proper motion B1950 (FK4)	RA: -0.0003 arcsec/a	DEC: 0 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0 arcsec/a	DEC: -0.002 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	3.9 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	B3
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 180
Durchmusterung	BD+02 810
Boss General Catalogue	5978
Henry Draper Catalogue	31237

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

position:

position (equinox 1950.0)

RA: 4h 51min 38.7sec

DEC: +2° 21' 37''

variability informations:

variability type	ELL	rotating variable star
magnitute at max. brightness	3.66
magnitute at min. brightness	3.73
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2417922.565 13. December 1907, 01:33:36 UT
period [d]	3.700363
next maximum light [JD]	2452221.229647 7. November 2001, 17:30:42 UT

spectral information

spectral class

B2III-IV+B0V

references

to a study	Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph	Vol. I GCVS (see Kholopov et al. 1985-1988)

miscanellous

ID in the GCVS catalogue	60/90165
constellation	Orion
notes on existence	The star is equivalent to '0609022 khi'.
There are notes in published catalog.

variability type description

variability type	description
ELL	Rotating ellipsoidal variables (b Per, Alpha Vir). These are close binary systems with ellipsoidal components, which change combined brightnesses with periods equal to those of orbital motion because of changes in emitting areas toward an observer, but showing no eclipses. Light amplitudes do not exceed 0.1 mag in V.

catalogues and names	p⁵Ori, pi 5 Ori, 8 Ori, HR 1567, HD 31237, SAO 112197, BD +2 810, FK5: 180
constellation	Orion